how many ions of cl- are in 3.46 moles
Answers
Answer: 0.910 moles NA+
Definition: of Like Decimal: Two or more decimal fractions are called like ... 0.910; 10.819; 89.637; 142.800 (b) 12.01; 180.3; 1446.105; 180.19
Related Questions
A sample of gaseous arsine (AsH3) in a 460 mL flask at 332 Torr and 223 K, is heated to 437 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 273 K, at which tem- perature the pressure in the flask is 488 Torr. What percentage of arsine molecules have de- composed?
Answer in units of %.
Answers
Answer:
28/95 = 29.,5 % of Arsine decomposed
Explanation:A sample of gaseous arsine (AsH3) in a 460 mL flask at 332 Torr and 223 K, is heated to 437 K, at which temperature arsine decom- poses to solid arsenic and hydrogen gas. The flask is then cooled to 273 K, at which tem- perature the pressure in the flask is 488 Torr. What percentage of arsine molecules have de- composed?
Answer in units of %.
initial pressure 332 Torr initial volume 0.46 L initial temperature 223K
final pressure 488 Torr final volume 0.46 L final 273 K
Torr is 1/760 atm 332 torr = 0.437 atm 488 Torr =0.642 atm
PV = nRT so n=RT/PV
INITIAL n= 0.082 X 223/(0.437)(0.46) = 91 moles
final n= 0.082 X 273 / (.437)(488) = 105 moles
2AsH3----------> 2As + 3H2
x moles of Arsine decomposed to make 1.5 moles of H2
the final number of moles was
(91 -X)+ 1.5 X = 105 moles
91 + 0.5 X = 105
0.5 X = 14
X =28
CHECK
if 28 moles of Arsine , then the container would have
91 --28 + 1.5(28) = 91 +14 =105 check
so 28/95 = 29.,5 % of Arsine decomposed
Your answer
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Answer:
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Select all the substances that require facilitated diffusion to cross a membrane. (you can select multiple)
A. negativity charged ions
B. hydrophilic molecules
C. molecules with no charge
D. hydrophilic molecules
Answers
A: Negatively charged ions
B: Hydrophollic molecules
Facilitated diffusion is the spontaneous passive transport of molecules across the biological membrane through the help of a membrane protein. This type of diffusion occurs in the molecules that cannot cross the membrane freely and requires a molecule to enter and leave the membrane.
Negatively charged ions and hydrophobic molecules require facilitated diffusion.
What occurs in facilitated diffusion?Channel and carrier proteins are needed for the facilitated diffusion because the molecules are not self-sufficient to cross the membrane on their own. Charged, polar ions and water-fearing molecules are transported with the help of certain protein channels and carriers that facilitates the molecules from the varied concentration environment.Therefore, option A and B are correct.
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what is represented by the line ab? enter one of the following choices: solid, liquid, gas, melting solid, boiling liquid what constant do you use to calculate the heat absorbed here? enter one of the following: csolid, cliquid, cgas, heat of fusion, heat of vaporization what is represented by the line bc? enter one of the following choices: solid, liquid, gas, melting solid, boiling liquid what constant do you use to calculate the heat absorbed here? enter one of the following: csolid, cliquid, cgas, heat of fusion, heat of vaporization what is represented by the line cd? enter one of the following choices: solid, liquid, gas, melting solid, boiling liquid what constant do you use to calculate the heat absorbed here? enter one of the following: csolid, cliquid, cgas, heat of fusion, heat of vaporization what is represented by the line de? enter one of the following choices: solid, liquid, gas, melting solid, boiling liquid what constant do you use to calculate the heat absorbed here? enter one of the following: csolid, cliquid, cgas, heat of fusion, heat of vaporization what is represented by the line ef? enter one of the following choices: solid, liquid, gas, melting solid, boiling liquid what constant do you use to calculate the heat absorbed here? enter one of the following: csolid, cliquid, cgas, heat of fusion, heat of vaporization
Answers
Solid, Heat of fusion, Liquid, Heat of vaporization, and Gas are the answers for the following questions represented by the graph.
At phase transition temperature is constant so BC & DE represent phase transition.
1)AB represents solid here \(C_{solid}\) constant use to calculate heat absorbed here.
2)BC represents melting solid here heat of fusion is constantly used to calculate heat absorbed here.
3)CD represents liquid here \(C_{liquid}\) constant use to calculate heat absorbed here.
4)DE represents Boiling liquid here Heat of vaporization is constant used to calculate heat absorbed here.
5)EF represents gas here \(C_{gas}\) constant used to calculate heat absorbed here.
An alteration in the state from one phase to another is known as a phase transition. A phase transition is identified by a sudden change in one or more physical attributes accompanied by a minute change in temperature.
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what does a good hypothesis require
Answers
A hypothesis is not simply a wild guess. The experiment sets out to prove or disprove the hypothesis. The individual conducting the experiment must write the hypothesis in simple, concise language. This guarantees the hypothesis is testable. “How many times a week should a man exercise?” is an example of a bad hypothesis because it is a question, and it is not testable. A good hypothesis on the same topic could be worded in this manner: “If a male exercises more than twice a week, he is less susceptible to heart disease.” Observable factors that can be measured are an essential characteristic of a good hypothesis. A good hypothesis addresses a general phenomenon and not an isolated occurrence. Scientists must consider the variables that are going to be manipulated in the experiment and be sure to include them in the hypothesis itself. Examples of variables include participants, what changes during the testing and what the changes will be. Finally, a good hypothesis is based on logic.
Do all irreversible reactions go to completion? If so why?
Answers
Answer:
True
Explanation:
All irreversible reactions go to completion because the process cannot proceed in the backward direction.
A reversible reaction is one that does not go into completion in one direction.
An irreversible direction completely uses up the reactants to form the products and goes into completion.
These reactions can only proceed in one direction and not both.
what is the rate constnat for the uncatalyzed hydrolysis of this bond if the reaction is first order
Answers
The rate constant for the uncatalyzed hydrolysis of the glycosidic bond in trehalose is 1.45 × 10⁻¹³ s⁻¹, and the rate enhancement for the glycosidic bond hydrolysis catalyzed by trehalase is 1.79 × 10¹⁶.
The rate constant for the uncatalyzed hydrolysis of the glycosidic bond in trehalose can be calculated using the half-life, \(t_{1/2}\), which is given as 6.6 × 10⁶ years:
\(t_{1/2}\) = ln(2) / k
Rearranging this equation gives:
k = ln(2) / \(t_{1/2}\)
Substituting the given values, we get:
k = ln(2) / 6.6 × 10⁶ years
Using the conversion factor 1 year = 31,536,000 s, we can convert the time unit from years to seconds:
k = ln(2) / (6.6 × 10⁶ years × 31,536,000 s/year)
k = 1.45 × 10⁻¹³ s⁻¹
The rate enhancement for the catalyzed reaction can be calculated using the following equation:
Rate enhancement = (kcat / kuncat)
where kcat is rate constant for catalyzed reaction, and kuncat is rate constant for uncatalyzed reaction.
Substituting the given values, we get:
Rate enhancement = (2.6 × 10³ s⁻¹) / (1.45 × 10⁻¹³ s⁻¹)
Rate enhancement = 1.79 × 10¹⁶
Therefore, the rate enhancement for the glycosidic bond hydrolysis catalyzed by trehalase is 1.79 × 10¹⁶, which indicates that the catalyzed reaction is much faster than the uncatalyzed reaction.
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--The given question is incomplete, the complete question is
"The half-life for the hydrolysis of the glycosidic bond in the sugar trehalose is 6.6 × 10⁶ years. a. What is the rate constant for the uncatalyzed hydrolysis of this bond? [Hint: For a first-order reaction, the rate constant, k, is equal to 0.693/\(t_{1/2}\).] b. What is the rate enhancement for glycosidic bond hydrolysis catalyzed by trehalase if the rate constant for the catalyzed reaction is 2.6 × 10³ s⁻¹?"--
In the boxes below, draw three particle diagrams representing the sample
of alcohol cooling in the experiment described above. The diagrams should
represent the sample at 3 minutes, 12 minutes, and 17 minutes.
Use the phase diagram and cooling curve above to help you draw the
diagrams.
Answers
Answer: 2
Explanation: bencause they are changing
select the different types of hazardous wastes. a corrosive
b flammable c nonpoisonous
d toxic
e chemically reactive
f natural
Answers
The different types of hazardous wastes include: a) Corrosive, b) Flammable, d) Toxic, e) Chemically reactive. Hazardous wastes are substances that pose a risk to human health or the environment.
They can be categorized into different types based on their properties and potential hazards.
Corrosive wastes are substances that can cause damage to metals or other materials through chemical reactions. They have a pH less than or equal to 2 or greater than or equal to 12.5.
Flammable wastes are substances that have a flashpoint below 60 degrees Celsius (140 degrees Fahrenheit). They can ignite easily and sustain combustion.
Toxic wastes are substances that can cause harm or death when ingested, inhaled, or come into contact with living organisms. They may contain toxic chemicals such as heavy metals, pesticides, or certain organic compounds.
Chemically reactive wastes are substances that can undergo violent reactions or release toxic gases when exposed to heat, pressure, or other substances. They may be unstable or prone to detonation.
Nonpoisonous wastes, as mentioned in option c, are not typically considered hazardous wastes since they do not possess Hazardous the inherent toxicity or potential hazards associated with the other types mentioned above.
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Cadmium (Cd) can be purified by the electrolysis of aqueous cadmium nitrate. Suppose an electrolytic cell is constructed with a cadmium cathode and a platinum anode, and contains 0.050 M solution of CdNO, solution. How much cadmium metal will be produced, if a constant current of 1.85 A is passed through the electrolytic cell for 100 minutes?
Answers
In the given setup, when a constant current of 1.85 A is passed through the electrolytic cell for 100 minutes, approximately 0.155 grams of cadmium metal will be produced.
During electrolysis, the passage of current causes the reduction of cadmium ions (Cd²⁺) at the cathode, resulting in the deposition of cadmium metal. The current passing through the cell is directly proportional to the amount of substance produced in electrolysis, as stated by Faraday's law of electrolysis. Faraday's law states that the amount of substance produced is proportional to the product of the current, time, and the equivalent weight of the substance.
To determine the amount of cadmium metal produced, we need to calculate the quantity of electricity (in coulombs) passed through the cell using the formula: Quantity of electricity = current (in amperes) × time (in seconds). Since the given time is in minutes, it needs to be converted to seconds by multiplying it by 60. Next, we calculate the moles of cadmium (Cd) using the formula: moles = Quantity of electricity (in coulombs) / (Faraday's constant × charge of Cd²⁺). The charge of Cd²⁺ is 2 (as it loses two electrons), and the Faraday's constant is 96,485 C/mol. Finally, we convert moles of cadmium to grams using its molar mass (112.41 g/mol) to obtain the mass of cadmium metal produced.
By plugging in the given values, we can calculate that approximately 0.155 grams of cadmium metal will be produced during the electrolysis of the 0.050 M solution of Cd(NO₃)₂ for 100 minutes.
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the specific heat capacity of glass is 0.20 cal/(g°C). If 30 cal of heat is added to an unknown mass of glass, the temperature rises by 150°C. what is the mass of the glass?
Answers
The mass of the glass is 1 gram.
What is specific heat capacity?
This refers to the amount of heat in joules (J) absorbed per unit mass (kg) of the material when its temperature rises 1 K (or 1 °C), and its units are J/(kg K) or J/(kg °C).
From the question:
cp= 0.20 cal/(g°C)
T = 150°C
heat added = 30 cal
Solution:To find the mass of the glass, you can use the formula:
mass = heat added / (specific heat capacity x temperature change)
Substituting the given values:
mass = 30 cal
(0.20 cal/(g°C) x 150°C)
mass = 30
(0.20 x 150)
mass = 30
30
mass = 1 g
Hence, the mass of the glass is 1 gram.
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how many moles are in 2.00g of H2O
Answers
n = m/M = 2/18 = 1/9 ~0,1 mol
Answer:
.111 mole (using 3 significant digits)
Explanation:
Mole weight of H2O = 2 x 1.008 + 15.999 = 18.015 gm/mole
2 gm / 18.015 gm/mole = .111 mole
Balance this equation and pick the answer with the coefficients that belong there
Answers
Answer:
The answer is 2, 3, 6, and 1
Explanation:
Write down the coefficients of 2, 3, 6, and 1. Try them out and then multiply the atoms together.
2AlBr3 = Al2Br6
3K2SO4 = K6(SO4)3
6KBr = K6Br6
1Al2(SO4)3 = Al2(SO4)3
Al2Br6 + K6(SO4)3 = K6Br6 + Al2(SO4)3
All the reactants and products have the same number of atoms/molecules in each element. Therefore, this equation is balanced.
So the final answer is 2, 3, 6, and 1.
Hope it helped!
In 1790, Nicolas Leblanc found a way to form Na₂CO₃ from NaCl. His process, now obsolete, consisted of three steps:2NaCl(s) + H₂SO₄(aq) & → Na₂SO₄(aq) + 2HCl(g)
Na₂SO₄(s) + 2C(s) & → Na₂S(s) + 2CO₂(g)
Na₂S(s) + CaCO₃(s) & → Na₂CO₃(s) + CaS(s)(c) Is the overall process spontaneous at standard-state conditions and 298 K?
Answers
The overall process is not spontaneous at standard-state conditions and 298 K.
How this is calculated?The entropy change of the cosmos is used to calculate the process to assess how spontaneous a response is. This process is spontaneous if Delta s is positive. Negative Delta S indicates a non-spontaneous process. ΔS sun iv=ΔS system+ ΔS surroundings The entropy at 500 degrees Celsius will be -13J/K×mol. The entropy at 700 degrees Celsius will be -5.8 J/K×mol. The subsequent melting of NaCl at standard-state circumstances and 298 K is not spontaneous because we know that there is a reduction and that Delta S is less than zero at both dimension temperatures.Hence, The overall process is not spontaneous at standard-state conditions and 298 K.
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3. (05.05 LC)
Which of the following is a characteristic of a mixture? (2 points)
O Definite composition
Each substance in the mixture retains its own properties
The different elements are chemically bonded together
Elements are separated by a chemical change
Answers
Each substance in a mixture preserves its own properties, which is one of its characteristics. A mixture is any two or more different substances that have been physically blended but not chemically.
The characteristic of a mixtureThe characteristic of a mixture is that each substance in the mixture retains its own properties. A mixture is a combination of two or more substances that are physically mixed together but not chemically combined.
This means that the different components of a mixture can be separated by physical means, such as filtration, distillation, or chromatography. In a mixture, the different substances do not lose their individual properties and can be present in any proportion.
This is in contrast to a compound, which is a substance made up of two or more elements that are chemically bonded together in a fixed ratio, and which has a definite composition.
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Calculate the [H+] in a 1.0 M solution of HA
Answers
If you were calculating for the [OH-] concentration, you would have to complete several conversions to find it. But since they ask for the [H+] concentration, your answer would be equal to the molarity of the solution.
A compound was found to contain 90.6% lead (Pb) and 9.4% oxygen. What is the empirical formula for this compound?
Answers
Answer:
the answer is 47.9 and ik because I just had that question
The empirical formula of the compound is O₄Pb₃.
What is the empirical formula?
An Empirical system is the chemical system of a compound that offers the proportions of the elements gifted within the compound however not the real numbers or arrangement of atoms. This would be the lowest complete variety ratio of the elements within the compound.
Amount of lead (Pb) = 90.6%
⇒and amount of oxygen = 9.4%
taking the whole number ratio
o = 4
Pb = 3
∴ ⇒O: Pb=4:3
O4Pb3 answer.
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PLEASE HELP!!!
need help asap!!
Answers
Answer:
the tree branch is puching up on his foot
2C7H6O2 + 15O2 <=> 14CO2 + 6H2O
Philly reacted 120g of Benzoic acid with a surplus of Oxygen gas. If the reaction produced 60g of Carbon dioxide what was Philly's percent yield?
Answers
Philly's percent yield in this reaction is approximately 19.89%.
To calculate the percent yield of the reaction, we need to compare the actual yield (the amount of carbon dioxide produced in the reaction) to the theoretical yield (the maximum amount of carbon dioxide that can be produced based on the stoichiometry of the balanced equation).
The balanced equation for the reaction is:
2C7H6O2 + 15O2 -> 14CO2 + 6H2O
From the balanced equation, we can see that for every 2 moles of C7H6O2 (benzoic acid) reacted, 14 moles of CO2 are produced.
First, let's calculate the theoretical yield of CO2:
Molar mass of C7H6O2 (benzoic acid) = 122.12 g/mol
Moles of C7H6O2 = Mass / Molar mass = 120 g / 122.12 g/mol = 0.982 mol
According to the stoichiometry of the balanced equation, 0.982 mol of C7H6O2 will produce (14/2) * 0.982 mol of CO2.
Theoretical yield of CO2 = (14/2) * 0.982 mol * molar mass of CO2 = 6.859 * 44.01 g = 301.7 g
Now, let's calculate the percent yield:
Percent yield = (Actual yield / Theoretical yield) * 100
Percent yield = (60 g / 301.7 g) * 100 = 19.89%
Therefore, Philly's percent yield in this reaction is approximately 19.89%.
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Which topic is the teacher most likely talking about
Answers
The teacher is saying about one of the separation method for hydrocarbons namely, distillation of mixture based on their boiling points.
What is distillation?Distillation is a separation technique by which individual components in a mixture can be separated based on their boiling points. In this technique, the mixture is taken in one flask which is heated to high temperature in arange of boiling point of the components.
The most volatile component boils first which is then passed into the condenser from there it cools down and liquify. The liquified sample is collected into the second flask. In the similar way remaining components can be separated.
Gasoline, kerosene and diesel oil have different boiling points from each other and they will condense at different temperatures. Thus a mixture of these three components can be separated using distillation process.
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Your question is incomplete. But your complete question probably was:
A teacher makes the following statement.
"Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C."
What topic is the teacher most likely talking about?
What is the uninterrupted passage of insolation through the atmosphere or water?
Answers
Transmission is referred to as the uninterrupted passage of insolation through the atmosphere or water.
What is Insolation?This can be defined as the process in which solar energy is incident onto objects which are usually in the form of waves. This is made possible through the process of heat transfer which is referred to as radiation in a medium such as air, water etc.
This is transmitted to the environment as it serves as a source of energy for the organisms which are present in the ecosystem. It is usually uninterrupted and are absorbed by plants during the process of photosynthesis.
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where is the magnitude of force of magnetism the greatest
Answers
Answer:
The strength of the field varies depending on its location around the magnet. The magnetic field of a bar magnet is strongest at either pole of the magnet. It is equally strong at the north pole when compared with the south pole.
Explanation:
What is the approximate frequency of green light that has a wavelength of 520 nm?
Answers
Answer:
5.77 x 10¹⁴ Hz
Explanation:
Order these compounds in order of decreasing carbon–carbon bond length: HCCH, H2CCH2, H3CCH3.
Answers
The compounds ordered in decreasing carbon-carbon bond length are: H3CCH3 > H2CCH2 > HCCH.
The carbon-carbon bond length is influenced by the hybridization of the carbon atoms and the presence of multiple bonds.
In H3CCH3 (ethane), all carbon atoms are sp3 hybridized, and there are only single bonds between them. The carbon-carbon bond length in ethane is relatively long due to the larger size of sp3 hybrid orbitals. Therefore, H3CCH3 has the longest carbon-carbon bond length among the given compounds.
In H2CCH2 (ethylene), the central carbon atom is sp2 hybridized, and there is a double bond between the carbon atoms. The presence of the double bond results in a shorter carbon-carbon bond length compared to ethane.
In HCCH (acetylene), both carbon atoms are sp hybridized, and there is a triple bond between them. The triple bond contains two pi bonds, which are stronger and shorter than a single or double bond. Therefore, HCCH has the shortest carbon-carbon bond length among the given compounds.
In decreasing order of carbon-carbon bond length, the compounds are arranged as follows: H3CCH3 > H2CCH2 > HCCH.
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Consider the pictured representations of electromagnetic waves. Which electromagnetic wave corresponds to each description? Lowest frequency Choose... Second Highest energy Choose... Highest energy Choose. Shortest wavelength Choose...
Answers
In the picture representation of electromagnetic waves,
a) Lowest frequency - C
b) Second Highest energy - A
c) Highest energy - B
d) Shortest wavelength - B
Wavelength can be defined as the distance between identical points (adjacent crests) in the adjacent cycles of a waveform signal propagated in space or along a wire. In wireless systems, this length is usually mentioned in meters (m), centimeters (cm), or millimeters (mm).
If the wavelength of electromagnetic waves is low, the frequency of a wave is also low and the energy is low.
If the wavelength of electromagnetic waves is short, the frequency of a wave is also high and the energy is high.
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what is the mass of electron
Answers
Explanation:
The rest mass of the electron is 9.1093837015 × 10−31 kg, which is only 1/1,836the mass of a proton. An electron is therefore considered nearly massless in comparison with a proton or a neutron, and the electron mass is not included in calculating the mass number of an atom.
Answer: The Mass of an electron is 9.1093837 x 10^-31 kgs
Explanation:
In each case, predict which molecule of the pair has the greater molar entropy under the same conditions (assume gaseous species):(a) H20(b) D2O(c) water(d) heavy water
Answers
Molar entropy is greater for \(H_{2} O\) than for \(D_{2}O\) due to their molecular weights and degrees of freedom.
What is the difference in molar entropy between \(H_{2} O\) and \(D_{2} O\)?
(a) The molar entropy of \(H_{2} O\) is greater than that of \(D_{2} O\) under the same conditions, because \(H_{2} O\) has a smaller molecular weight and thus more translational degrees of freedom.
(b) This statement is incorrect. The molar entropy of \(D_{2} O\) is actually slightly greater than that of \(H_{2} O\) under the same conditions, due to the slightly larger size of the \(D_{2} O\) molecule leading to greater rotational and vibrational degrees of freedom.
(c) and (d) Water and heavy water are different names for \(H_{2} O\) and \(H_{2} O\), respectively, so the same reasoning applies as in parts (a) and (b): the molar entropy of \(H_{2} O\) is greater than that of \(D_{2} O\).
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If beer have a ph of 3 and baking soda have a ph of 9, which has a higher concentration?
Answers
We cannot determine which substance has a higher concentration based solely on their pH values. Concentration would require additional information, such as the amount or mass of the substances dissolved in a given volume of solution.
The pH scale is a logarithmic scale that measures the acidity or alkalinity (basicity) of a solution. The pH values range from 0 to 14, where lower pH values indicate higher acidity and higher pH values indicate higher alkalinity.
In the given scenario, beer has a pH of 3, indicating it is acidic. Baking soda, on the other hand, has a pH of 9, indicating it is alkaline (basic).
When comparing the concentration between these two substances based solely on their pH values, it is important to note that pH does not directly correlate with concentration. pH is a measure of the hydrogen ion concentration (H+) in a solution, not the overall concentration of the substance.
Therefore, we cannot determine which substance has a higher concentration based solely on their pH values. Concentration would require additional information, such as the amount or mass of the substances dissolved in a given volume of solution.
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excessive use of fertilizers make soil fertile. true or false
Answers
QUESTIONS
40. Because stimulants
will be compromised.
your ability to use proper judgment on the road
A. increase your heart rate
B. overload your nervous system
C. slow down your bodily functions
D. usually cause hallucinations
Answers
Answer:
B.
Explanation:
Which diagram represents the correct proportion of 87Rb to its decay
product, 87Sr, after two half-lives?
Answers
Top left corner diagram represents the correct proportion of 87Rb to its decay product.
What is radio active decay?Radioactive decay is the process by which unstable nuclei lose energy due to radiation. Substances containing unstable nuclei are considered radioactive. The three most common types of decay are alpha decay, beta decay, and gamma decay, all of which emit one or more particles. If the nuclei are not in the lowest possible energy state, radioactive decay can occur as the nuclei remix and rearrange to find a new stable situation. Different types of radiation are produced by the different ways the nucleus reconfigures itself. The starting isotope is rubidium-87 (⁸⁷Rb for short). It is radioactive, has 37 protons and 50 neutrons (87 nucleons total), decays to Strontium-87, and has a half-life of 49 billion years.
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