Answers
Answer:
4
Explanation:
\(\int\limits^a_b {x} \, dwetjernjtnx\)
Related Questions
I WILL GIVE 35 POINTS TO THOSE WHO ANSWER THIS QUESTION RIGHT NOOOO SCAMS PLEASE
Answers
The molarity of the solution prepared by dissolving 0.355 moles of NH₃ in enough water to make 3.84 L of solution is 0.092 M
How do i determine the molarity of the solution?First, we shall list out the given parameters from the question. This is given below:
Number of mole of NH₃ = 0.355 moleVolume of solution = 3.84 LMolarity of solution = ?Molarity of a solution is defined as mole per unit volume i.e
Molarity of solution = mole / volume
Inputting the various parameters, we have:
Molarity of solution = 0.355 / 3.84
Molarity of solution = 0.092 M
Thus, from the above calculation, it is evident that the molarity of the solution is 0.092 M
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Find the "natural" equilibrium concentration of NO in air in units of molecules/cm3 .
Answers
Answer:
6400 molecules / cm^3
Explanation:
10.6*10^-16 mol/L * 6.022*10^23 molecules/mol * 1 L / 1000 cm^3 * 1 / 100 L = 6400 molecules / cm^3
The "natural" equilibrium concentration of Nitric oxide in air in units of molecules/cm .0.062molecules/cm3
chemical equilibrium or equilibrium concentration is a state when the rate of forward reaction in a chemical reaction becomes equal to the rate of backward reaction. At the same time, there is no change in the products and reactants, and it seems that the reaction has stopped.
How do you find the equilibrium concentration?The equation for Beer's law is a straight line with the general form of y = mx +b. where the slope, m, is equal to εl. In this case, use the absorbance found for your unknown, along with the slope of your best fit line, to determine c, the concentration of the unknown solution.
Does equilibrium mean same concentration?Reversible reactions occur until equilibrium is established, meaning that they achieve a sort of balance between amounts of reactant and product. If the reactants and products are equal in energy, at equilibrium, they will have the same concentration.
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Estimate the pH and Fraction (in terms of percentage) CH3COOH molecules deprotonated in 0.15 M CH3COOH
Answers
The pH of the 0.15 M \(CH_3COOH\) solution is approximately 2.38. and around 2.9% of the \(CH_3COOH\) molecules in the 0.15 M solution are deprotonated.
Acetic acid (\(CH_3COOH\)) is a weak acid that only partially dissociates in water to form \(H^+\) ions and \(CH_3COO^-\) ions. To estimate the pH and fraction of \(CH_3COOH\)molecules deprotonated in a 0.15 M \(CH_3COOH\)solution, we can use the following equations and approximations:
The dissociation constant for acetic acid (Ka) is 1.8 x 10^-5.
The initial concentration of \(CH_3COOH\) is equal to its concentration at equilibrium, since it only partially dissociates.
The concentration of \(H^+\) ions is equal to the concentration of \(CH_3COO^-\) ions at equilibrium, since the dissociation reaction involves a 1:1 ratio of \(H^+\) ions to \(CH_3COO^-\) ions.
Using these approximations, we can set up an equilibrium expression for the dissociation of \(CH_3COOH\) :
\(Ka = [H^+][CH_3COO^-]/[CH_3COOH]\)
We also know that the initial concentration of \(CH_3COOH\) is 0.15 M. Let x be the concentration of \(H^+\) ions and \(CH_3COO^-\) ions at equilibrium. Then:
[\(H^+\)] = x
[\(CH_3COO^-\)] = x
[\(CH_3COOH\)] = 0.15 - x
Substituting these values into the equilibrium expression and solving for x, we get:
Ka = x^2 / (0.15 - x)
1.8 x 10^-5 = x^2 / (0.15 - x)
x = 0.0042 M
The pH can be calculated using the formula:
pH = -log[\(H^+\)]
pH = -log(0.0042)
pH = 2.38
Therefore, the pH of the 0.15 M \(CH_3COOH\) solution is approximately 2.38.
To estimate the fraction of \(CH_3COOH\) molecules that are deprotonated, we can use the equation:
Fraction deprotonated = \([CH_3COO^-] / [CH_3COOH]\) x 100%
At equilibrium, the concentration of \(CH_3COO^-\) ions is equal to the concentration of \(H^+\) ions, which we calculated to be 0.0042 M. The concentration of \(CH_3COOH\) at equilibrium is 0.15 - 0.0042 = 0.1458 M. Substituting these values into the equation, we get:
Fraction deprotonated = 0.0042 / 0.1458 x 100%
Fraction deprotonated = 2.9%
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write the structural formula for 2-bromo-3-chloro-4,4-dimethylpentanal
Answers
Answer:
Br-CH2-CH(CH3)2-C(Cl)H-CH(CH3)2-CHO
Explanation:
The molecule has a total of 14 carbon atoms, 13 hydrogen atoms, and 1 bromine atom. The carbon atoms are arranged in a chain with a methyl group attached to the second carbon atom, a chlorine atom attached to the third carbon atom, and two methyl groups attached to the fourth carbon atom. The fifth carbon atom has a carbonyl group attached to it.
The molecule is an aldehyde, which means that it has a carbonyl group (C=O) at the end of the chain. The carbonyl group is polar, and the oxygen atom has a partial negative charge. The hydrogen atom has a partial positive charge. This polarity makes the aldehyde group susceptible to nucleophilic attack.
The bromine and chlorine atoms are both electrophilic, which means that they have a partial positive charge. This makes them susceptible to nucleophilic attack.
The methyl groups are non-polar and do not have any significant reactivity.
The molecule is a chiral molecule, which means that it has a mirror image that is not superimposable on itself. This is because the carbon atom with the carbonyl group is attached to four different groups.
The molecule is a liquid at room temperature and has a strong odor. It is used in a variety of products, including perfumes, flavorings, and plastics.
Use Hess’s Law to calculate the enthalpy change for the reaction.
C2H4(g) + H2(g) → C2H6(g) ∆Hrxn = ?
Given:
C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l) ∆Hrxn 1 = -1410.9kJ
2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) ∆Hrxn 2 = -3119.4kJ
2H2(g) + O2(g) → 2H2O(l) ∆Hrxn 3 = -571.6kJ
Answers
Answer:
∆Hrxn 1 + ∆Hrxn 3 - ∆Hrxn 2 = ?
-1410.9kJ - 571.6kJ + 3119.4kJ = ?
-2801.1kJ
2.70mol Na and 2.40 mol Cl2 are placed in a container. They react to form NaCl. What is the limiting reactant?
Answers
The limiting reactant in the reaction between 2.70 mol Na and 2.40 mol Cl2 to form NaCl is Na.
To determine the limiting reactant in a chemical reaction, we need to compare the amount of each reactant with the stoichiometry of the reaction. The balanced chemical equation for the reaction between sodium (Na) and chlorine gas (Cl2) to form sodium chloride (NaCl) is:
2 Na + Cl2 → 2 NaCl
According to the equation, two moles of Na react with one mole of Cl2 to form two moles of NaCl. Therefore, to calculate the amount of NaCl that can be formed, we need to determine which reactant is present in the limiting amount.
The molar ratio of Na to Cl2 in the reaction is 2:1. Therefore, for every 2 moles of Na, we need 1 mole of Cl2 to react completely.
Starting with 2.70 mol of Na and 2.40 mol of Cl2, we can calculate the amount of NaCl that can be formed from each reactant:
Na: 2.70 mol Na x (2 mol NaCl/2 mol Na) = 2.70 mol NaCl
Cl2: 2.40 mol Cl2 x (2 mol NaCl/1 mol Cl2) = 4.80 mol NaCl
Comparing the amounts of NaCl that can be formed from each reactant, we can see that the amount of NaCl formed by the reaction with Na is 2.70 mol, while the amount of NaCl formed by the reaction with Cl2 is 4.80 mol. Therefore, the limiting reactant is Na, as all of the Na will react, but there will be some Cl2 left over.
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1. How many moles of calcium are in 525g Ca?
Answers
Answer:
13.1743
Explanation:
1 grams Calcium to mol = 0.02495 mol
According to the mole concept, there are 13.12 moles of calcium in 525 g of calcium.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass in grams present in one mole of atoms is its atomic mass.Number of moles= mass/molar mass= 525/40=13.12 moles.
Thus, there are 13.12 moles of calcium in 525 g of calcium.
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Here is a second order reaction A→ P. If the initial concentration of A 0.0818 M goes down 30.0% in 3.15 minutes, what is the rate constant for the reaction?
Answers
The rate constant of the second-order reaction is 0.111 M^-1 min^-1.
The given data represents a second-order reaction where the rate of the reaction is proportional to the square of the concentration of A.
The integrated form of the second-order reaction is:
1/[A]t = kt + 1/[A]0
where [A]t and [A]0 are the concentrations of reactant A at time t and time zero, respectively, k is the rate constant.
We can use the given information to calculate the rate constant (k) of the reaction for the given half-life (t1/2) of 3.15 minutes:
t1/2 = (1 / k[A]0)
Using the percentage decrease in concentration and the given initial concentration, we can calculate the concentration of A at time t:
[A]t = [A]0 - 0.30[A]0 = 0.57126 M
Substituting the given values, we get:
3.15 min = (1 / k)(0.0818 M) / (0.0818 M - 0.57126 M)
Simplifying the equation above, we can solve for k:
k = 0.111 M^-1 min^-1
Therefore, the rate constant of the second-order reaction is 0.111 M^-1 min^-1.
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A sample of chlorine gas starting at 688 mm Hg is placed under a pressure of 994 mm Hg and reduced to a volume of 500.2 mL. What was the initial volume, in mL, of the chlorine gas container if the process was performed at constant temperature?
Answers
(P1V1=nRT1)/(P2V2=nRT2)
Constant temperature → (P1V1)/(P2V2)
688 mm Hg → 0.905 atm
994 mm Hg → 1.30789 atm
500.2 mL → 0.5002 L
(P1V1)/(P2V2)
(0.905)V1/(1.30789)(0.5002)
V1 = 0.72288 L → 722.88 mL
Calculate the molarity of the solution in a flask that contains 2.50 moles of potassium sulfate in 125 mL of solution.
Answers
Answer:
20M or 20mol/L
Explanation:
molarity = moles/volume (in Liters)
= 2.5/0.125L
=20M or 20 mol/L
22
F
15 16
Which of the following observations would indicate that a material is a pure substance?
It does not dissolve in water.
OIt changes color after heating.
It cannot be physically broken down into different types of atoms.
It can be physically broken down into different types of molecules.
17
18
19
Answers
The statement correct about about the pure substance is option 3. It cannot be physically broken down into different types of molecules.
What are pure substances ?Pure substance are substance with a definite proportion of its constituent atoms or molecules which cannot be physically separated and does not contain any impurities.
For example, water, fruit pulp, gaseous elements, metals, salt crystals etc. They contains only one type of molecules and are not mixtures of different type of molecules.
Therefore, pure substances cannot be physically broken down into different types of atoms. Hence, option 3 is correct.
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Palmitic acid, derived from palm oil, is one of the most common fatty acids found in butter, cheese, milk, and meat.
a. True
b. False
Answers
Answer:
a. True
Explanation:
Palmitic acid is the acid found in animals and plants. It is the saturated acid that contains fats. It is extracted from palm oil and from fat sources like butter, cheese, milk and meat. It is added in milk with low fat content to add Vitamin A in it. The fat content of palmitic acid is very high. excessive consumption of palmitic acid leads to heart diseases and life risks.
Which phrases apply to metamorphic rock formation? Check all that apply.
form from existing rocks
form without melting
appear foliated or non-foliated
form from liquid rock
form from deposition
require heat and pressure to form
Answers
Metamorphic rock formation involves the transformation of existing rocks under heat and pressure. They form without melting and can appear foliated or non-foliated.
Explanation:Metamorphic rocks are formed from the transformation of existing rock types in a process called metamorphism, which means 'change in form'. The appropriate phrases that describe metamorphic rock formation are: 'form from existing rocks', 'form without melting', 'appear foliated or non-foliated', and 'require heat and pressure to form'. These rocks are subject to conditions of heat and pressure that cause them to change physically and/or chemically, resulting in a new type of rock. They can either be foliated (layered) or non-foliated. Importantly, metamorphic rock formation does not include a liquid state, meaning they do not 'form from liquid rock' or 'form from deposition'.
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871g of sodium chloride is how many moles
Answers
Answer:
14.9 mol
Explanation:
To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.
871 g × (1 mol / 58.44 g)
= 871/58.44 mol
≈ 14.9 mol
Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.
Carbon Dioxide's Effects on Temperature (Edmentum)
Task 2:
Carbon Dioxide's Effects on Temperature
In this activity, you will use sodium bicarbonate tablets to see the effects of carbon dioxide on temperature. Sodium bicarbonate tablets are effervescent tablets that release carbon dioxide when dissolved in water.
Estimated time to complete: 1 hour
You will need these materials:
2 empty two-liter plastic bottles (or two similar-sized plastic containers with tight-sealing lids), rinsed
2 thermometers (not mercury)
1 liter of water, room temperature
a ball of clay, about 2 inches in diameter (needed only if you’re using two-liter plastic bottles)
2 sodium bicarbonate tablets (such as Alka-Seltzer)
a lamp with a 150-watt incandescent bulb (if direct sunlight is not available)
Follow these steps to set up the experiment. Then answer the question in part A.
Fill both bottles with water until they are half full.
In one bottle, place two sodium bicarbonate tablets.
Plug the opening of the two bottles tightly with clay. The clay will act as the cap.
Place one thermometer in each bottle by carefully piercing it through the clay, so that the thermometer dangles in the air inside the bottle. Stay safe: do not use mercury thermometers in the event that they might break. The bottles must remain tightly sealed. The thermometer must not touch the water.
Put both bottles in front of the lamp or in direct sunlight. Turn on the lamp and let the bottles stand for one hour. Stay safe: To avoid electrocution, keep all water away from electrical sources.
Hypothesis and Data Collection
Part A
Write down your predictions. After an hour, do you think there will be a temperature difference between the two bottles? Explain.
Part B
After one hour, record the temperatures. Write down your results.
Analyze and Extend
Part A
Was your prediction about the temperatures in the two bottles correct? Explain.
Part B
In your experiment, what is the dependent variable and what is the independent variable?
Part C
The tablets were a source of carbon dioxide. What can you conclude about the effect carbon dioxide has in the atmosphere?
Part D
The burning of fossil fuels, such as gasoline, coal, and oil, increases the amount of carbon dioxide in the atmosphere. Based on your experiment, what effects could this burning have on Earth’s temperature?
Part E
Mary is concerned about greenhouse gases in the atmosphere. She wants to buy an electric car that doesn’t use gasoline at all. What questions should Mary ask about electric cars to ensure that she is making a good choice for the environment?
Dispose of your waste properly:
Pour the water down the drain.
Rinse and recycle the plastic bottles.
Reuse the clay or place it in the trash.
Answers
Answer:
“You Asked” is a series where Earth Institute experts tackle reader questions on science and sustainability. Over the past few years, we’ve received a lot of questions about carbon dioxide — how it traps heat, how it can have such a big effect if it only makes up a tiny percentage of the atmosphere, and more. With the help of Jason Smerdon, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory, we answer several of those questions here.
How many electrons are being shared
Answers
In the carbon dioxide molecule has four shared pairs of electrons, there will be four covalent bonds created, hence option B is correct.
In organic chemistry, covalent bonds are far more prevalent than ionic ones. Two nuclei are simultaneously drawn to one or more pairs of electrons to form a covalent connection. Bonding electrons are those that are present between the two nuclei.
When atoms share electron pairs, covalent bonding results. Atoms create covalent bonds with one another in order to build a complete electron shell, which increases stability.
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How many particles of ZnCrO4 are present in a 4.5 mole sample?
Answers
2.7 × 10²⁴ particles ZnCrO₄
General Formulas and Concepts:Chemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 4.5 mol ZnCrO₄
[Solve] particles ZnCrO₄
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
[DA] Set up: \(\displaystyle 4.5 \ mol \ ZnCrO_4(\frac{6.022 \cdot 10^{23} \ particles \ ZnCrO_4}{1 \ mol \ ZnCrO_4})\)[DA] Multiply [Cancel out units]: \(\displaystyle 2.7099 \cdot 10^{24} \ particles \ ZnCrO_4\)Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
2.7099 × 10²⁴ particles ZnCrO₄ ≈ 2.7 × 10²⁴ particles ZnCrO₄
A bowl containing 70 grams of water, is heated from 10 °C to 90 °C. The specific heat of
water is 4.184 J/gºC. How much heat energy is required to heat the water?
Answers
Answer:
23430.4 J.
Explanation:
From the question given above, the following data were obtained:
Mass (M) = 70 g
Initial temperature (T₁) = 10 °C
Final temperature (T₂) = 90 °C
Specific heat capacity (C) = 4.184 J/gºC
Heat (Q) required =?
Next, we shall determine the change in the temperature of water. This can be obtained as follow:
Initial temperature (T₁) = 10 °C
Final temperature (T₂) = 90 °C
Change in temperature (ΔT) =?
ΔT = T₂ – T₁
ΔT = 90 – 10
ΔT = 80 °C
Finally, we shall determine the heat energy required to heat up the water. This can be obtained as follow:
Mass (M) = 70 g
Change in temperature (ΔT) = 80 °C
Specific heat capacity (C) = 4.184 J/gºC
Heat (Q) required =?
Q = MCΔT
Q = 70 × 4.184 × 80
Q = 23430.4 J
Therefore, 23430.4 J of heat energy is required to heat up the water.
What happens when the wind hits a barrier, such as a hill or a mountain?
explain.
OH AND I GIVE BRAINLIST
FOR THE BEST ANSWER.
Answers
Answer:
The wind will keep pushing against it and it will go around and above it. You can test this by holding a pot and a hairdryer. The air will go around the pot so the wind will do the same. The wind will go aound the object blocking its path by going to the side or up.
Explanation:
The wind will keep pushing against it and it will go around and above it. You can test this by holding a pot and a hairdryer. The air will go around the pot so the wind will do the same. The wind will go aound the object blocking its path by going to the side or up.
THEY ARE CALLED PREVAILING WINDS!!!!
Have an amazing day!!!
PLEASE RATE AND MARK BRAINLIEST!!!!
Answer: 1. D. It warms the air masses.
2. D. The air moves from high to low pressure systems.
3. B. It is pushed upwards and out.
4. B. uneven rainfall
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which of the following reactions is likely to be product favored based on energetic considerations? (you can select more than one reaction.) 2Na(s) + Cl2(g) -> 2NaCl(s) 2NH3(g) -> N2(g) 3H2(g) CH4(g) +2O2(g) -> CO2(g) + 2H2O(g) CH4(g) +2H2O(l) -> CO2(g) + 4H2(g)
Answers
Based on energetic considerations, the reactions that are likely to be product favored are:
2Na(s) + Cl₂(g) → 2NaCl(s)CH₄(g) +2O₂(g) → CO2(g) + 2H₂O(g)What are energetic considerations in chemical equations?Energetic considerations in chemical equations refer to the energy changes that occur during a chemical reaction. These changes can be in the form of heat, light, or work, and they determine the feasibility of a reaction based on the energy required and the energy produced. In general, reactions that have a positive change in energy (exothermic reactions) are more likely to be product-favored, as the products have lower energy than the reactants.
Conversely, reactions that have a negative change in energy (endothermic reactions) are less likely to be product-favored, as the products have higher energy than the reactants. Both of these reactions are exothermic, meaning they release energy, making them favored towards the formation of the products.
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A diprotic weak base ( B ) has pb values of 3.722 ( pb1 ) and 6.514 ( pb2 ). Calculate the fraction of the weak base in each of its three forms ( B , BH+ , BH2+2 ) at pH 8.984 .
B=
BH+=
BH2+2=
Answers
A diprotic weak base (B) has pb values of 3.722 (pb1) and 6.514 (pb2). The pH at which the dissociation of the first and second proton of a diprotic weak base is equal to its pKb1 and pKb2 values respectively. The pH at which the concentration of all the three forms of the base (B, BH+ and BH22+) is equal is given by the midpoint pH, pKb1 and pKb2, and is calculated using the equation:pH = 1/2 (pKb1 + pKb2)
The value of pH at which the fraction of the weak base in each of its three forms (B, BH+, and BH22+) can be calculated using the equation:B = [B]/([B] + [BH+] + [BH22+])BH+ = [BH+]/([B] + [BH+] + [BH22+])BH22+ = [BH22+]/([B] + [BH+] + [BH22+])Here, pH = 8.984, and pKb1 and pKb2 are 3.722 and 6.514 respectively. The midpoint pH can be calculated as follows:pH = 1/2 (pKb1 + pKb2)8.984 = 1/2 (3.722 + 6.514)8.984 = 5.118Concentration of base (B), protonated base (BH+), and doubly protonated base (BH22+) can be calculated as:B = [B]/([B] + [BH+] + [BH22+])BH+ = [BH+]/([B] + [BH+] + [BH22+])BH22+ = [BH22+]/([B] + [BH+] + [BH22+])Let's calculate the concentrations of each form one by one.B = [B]/([B] + [BH+] + [BH22+])pH = 8.984pKb1 = 3.722pKb2 = 6.514The fraction of the weak base in its unprotected form (B) is calculated using the following equation:[B] = B * ( [H+]/[OH-]) / (Kb1 + [H+]/Kb1 + Kb2 + [H+]2/Kb1*Kb2)Here, H+ = 10-pHOH- = 10-pKw/pH = 10-14/8.984Kb1 = 10-pKb1Kb2 = 10-pKb2Substituting the values in the above equation, we get:[B] = 0.2603At pH 8.984, the fraction of the weak base in its unprotected form (B) is 0.2603.BH+ = [BH+]/([B] + [BH+] + [BH22+])The fraction of the weak base in its singly pronated form (BH+) is calculated using the following equation:[BH+] = Kb1 * [B] * ( [H+]/[OH-]) / (Kb1 + [H+]/Kb1 + Kb2 + [H+]2/Kb1*Kb2)Substituting the values in the above equation, we get:[BH+] = 0.6687At pH 8.984, the fraction of the weak base in its singly protonated form (BH+) is 0.6687.BH22+ = [BH22+]/([B] + [BH+] + [BH22+])The fraction of the weak base in its doubly protonated form (BH22+) is calculated using the following equation:[BH22+] = Kb1*Kb2 * [B] * ( [H+]2/[OH-]2) / (Kb1 + [H+]/Kb1 + Kb2 + [H+]2/Kb1*Kb2)Substituting the values in the above equation, we get:[BH22+] = 0.0710At pH 8.984, the fraction of the weak base in its doubly protonated form (BH22+) is 0.0710.Finally, the fractions of the weak base in its three forms are:B = 0.2603BH+ = 0.6687BH22+ = 0.0710For such more question on fraction
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number of SO2 molecules in 1.28moles of SO2
Answers
Explanation:
To calculate the number of SO₂ molecules in 1.28 moles of SO₂, we need to use Avogadro's number
Avogadro's number = 6.022 × 10²³ molecules per mole.
First, we'll calculate the number of molecules in 1 mole of SO2:
1 mole of SO₂ = 6.022 × 10²³ molecules.
Then, we'll multiply this value by the number of moles of SO₂ given (1.28 moles):
Number of molecules = 1.28 moles × (6.022 × 10²³ molecules/mole)
Calculating this, we get:
Number of molecules = 7.70176 × 10²³molecules
Question 1 of 5
An atom's nucleus contains 8 particles that have no charge and 6 particles
that are positively charged. What is the atomic number of the atom?
A. 2
O
B. 8
C. 6
D. 14
SUBMIT
Answers
Answer:
C. 6
Explanation:
The atomic number of a number is related to the number of protons in the nucleus.
Hope this helps
Calculate the mass percent of Cl in SiCl2I2.
Answers
The mass percent of Cl in SiCl2I2 is 20.13%.
The chemical formula of SiCl2I2 can be broken down into its constituent elements, Si, Cl, and I. The total mass of the compound is the sum of the masses of these elements. Then, we can find the mass percentage of chlorine in SiCl2I2.
The mass of Si is 28.09 g/mol, the mass of Cl is 35.45 g/mol, and the mass of I is 126.9 g/mol. Therefore, the molar mass of SiCl2I2 is:
Molar mass of SiCl2I2 = (28.09 g/mol) + 2(35.45 g/mol) + 2(126.9 g/mol)
= 352.79 g/mol
To find the mass percentage of chlorine in SiCl2I2, we need to determine the mass of chlorine in the compound. There are two chlorine atoms in the molecule, so the mass of chlorine is:
Mass of Cl = 2(35.45 g/mol) = 70.9 g/mol
Now, we can calculate the mass percentage of Cl in SiCl2I2:
Mass percentage of Cl = (Mass of Cl / Molar mass of SiCl2I2) × 100%
= (70.9 g/mol / 352.79 g/mol) × 100%
= 20.13%
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using the ideal gas law, PV = nRT, in which R is 8.31 (L•kPa/mol-K), what would the temperature be if 0.75 moles of helium gas in a 2.0 L container have a pressure of 202.65 kPa
Answers
Answer:
65.0 K
Explanation:
To find the temperature, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (pKa)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas Constant (8.31 L*kPa/mol*K)
-----> T = temperature (K)
You can plug the given values into the equation and simplify to find the temperature.
P = 202.65 pKa R = 8.31 L*kPa/mol*K
V = 2.0 L T = ? K
n = 0.75 moles
PV = nRT
(202.65 pKa)(2.0 L) = (0.75 moles)(8.31 L*kPa/mol*K)T
405.3 = (6.2325)T
65.0 K = T
What does an electroscope do?
It adds electrons to an object
It detects negative static electricity when protons are drawn down into the
leaves of an electroscope, causing the leaves to repel one another and move
apart.
It calculates the amount of electrons in an object therefore knowing what kind of
element something is
Electroscopes do not exist, they are a Hollywood Sci-Fi creation
Answers
Answer:
It detects negative static electricity when protons are drawn down into the
Explanation:
electroscope, instrument for detecting the presence of an electric charge or of ionizing radiation, usually consisting of a pair of thin gold leaves suspended from an electrical conductor that leads to the outside of an insulating container.
What reasoning begins with a prediction based on a general principle
Answers
Answer:
Deductive reasoning (Brainliest please)
Explanation:Deductive reasoning begins with a general principle and a prediction based on this principle; the prediction is then tested, and a specific conclusion can then be drawn. The first step in the process of inductive reasoning is making specific observations.
A company is designing a new cell phone. They need a solid material that conducts electricity and can be made into a thin wire.
Which material would best fit their needs?
Answers
Answer:
Copper
Explanation:
Copper has excellent electrical conductivity, as well as malleability and ductility, making it easy to form into thin wires. Hope this helps!
3. You have 4 moles of CaF2. How many grams are present?
Answers
1) List the quantities.
Sample: 4 mol CaF2
2) Convert moles of CaF2 to grams of CaF2.
The molar mass of CaF2 is 78.0748 g/mol.
\(g\text{ }CaF_2=4\text{ }mol\text{ }CaF_2*\frac{78.0748\text{ }g\text{ }CaF_2}{1\text{ }mol\text{ }CaF_2}=312.3\text{ }g\text{ }CaF_2\)4 mol CaF2 is equal to 312.3 g CaF2.
Stamples of heterogeneous equilibria. FeO(s) + CO(g) = Fe(s) + CO₂(g) II. H₂(g) L₂(g) = 2HI(g) III. CO₂(g) + C(s) = 2CO(g) IV. N₂(g) 3H₂(g) + 2NH3(g) Identify I.
Answers
An example of heterogeneous equilibrium is:
I. FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g)What is heterogeneous equilibrium?Heterogeneous equilibrium refers to an equilibrium state in a chemical reaction where the reactants and products exist in different physical states or phases. It occurs when substances in different phases, such as solids, liquids, and gases, are involved in a chemical reaction.
Considering the given equations:
The equation I: FeO(s) + CO(g) ⇌ Fe(s) + CO₂(g) represents a heterogeneous equilibrium.
This is because the reactants and products involve different phases (solid and gas). FeO is a solid (s), CO is a gas (g), Fe is a solid (s), and CO₂ is a gas (g). The reaction involves the conversion of a solid and a gas to another solid and a gas, and the equilibrium is established between these different phases.
Learn more about heterogenous equilibrium at: https://brainly.com/question/25257772
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