Calculate the pOH of a solution that is 3.25x10^-10 M of Potassium hydroxide (KOH).
pOH =
(round to 2 decimal places)

The heat absorbed by the water is 25.9 KJ

To solve the question given above, we'll begin by calculating the change in the temperature of the water. This can be obtained as follow:

Initial temperature (T₁) = 25 °C  

Final temperature (T₂) = 32.50 °C

ΔT = 32.50 – 25

Finally, we shall determine the heat absorbed by the water. This can be obtained as follow:

Mass of water = 825.4 g

Change in temperature (ΔT) = 7.5 °C

Specific heat capacity of water = 4.184 J/gºC

Q = 825.4 × 4.184 × 7.5

Q = 25901.052 J

Divide by 1000 to express in KJ

Q = 25901.052 / 1000

Therefore, the heat absorbed by the water is 25.9 KJ.

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Answer: False

Explanation: Alloys are harder and stronger because the different-sized atoms of the mixed metals make the atomic layers less regular, so they cannot slide as easily.

Answer:

2.546 * 10^23 atoms of P2O5

Explanation:

Number of moles in 120.0 g of P2O5 =mass/ molar mass = 120.0 g/283.886 g/mol= 0.423 moles

1 mole of P2O5 contains 6.02 * 10^23 atoms

hence 0.423 moles of P2O5 will contain 0.423 *  6.02 * 10^23 /1 = 2.546 * 10^23 atoms of P2O5

Answer:

250 grams = 0.25 liter

Explanation:

In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

Thus,  Although they require very large sample sizes, hydrometers are rather simple to operate. Usually, 300 to 500 ml per measurement are required. Hydrometers frequently require calibration off-site as well.

With measurements taken by eye, user error is a major issue, and temperature management is especially challenging. Inaccurately bringing and maintaining samples at temperature might take a long time, and once more, user perception of temperature levels is used to determine temperature levels.

Pycnometers and hydrometers have a further problem in that the findings of alcohol measurement are challenging to evaluate and record.

Thus, In comparison to modern, highly accurate density meters or pycnometers, hydrometers are far less accurate and temperature.

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Answer:

D) 152 g

Explanation:

a mass of 1 mol Cr2O3 = 2 × 52 + 3 × 16 = 152 g number of moles of Cr2O3.

According to the information, we can infer that a 19.2-pound child would need to take approximately 2.49 tablets of 250.0 mg ampicillin per day.

To calculate the number of tablets the child needs to take, we first need to convert the weight of the child from pounds to kilograms. Since there are 2.20 pounds in 1 kg, we divide 19.2 pounds by 2.20 to get the weight in kilograms, which is approximately 8.73 kg.

Next, we calculate the daily dose of ampicillin for the child by multiplying the weight in kilograms by the recommended dosage of 115 mg/kg.

Since the available tablet size is 250.0 mg, we divide the total daily dose by the tablet size to find out how many tablets the child needs to take per day.

According to the above, we can infer that since we can't have a fraction of a tablet, we round the result to the nearest whole number. Therefore, a 19.2-pound child would need to take approximately 2.49 tablets (rounded to 2) of 250.0 mg ampicillin per day.

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To increase the gravitational force between the balloon and the golf ball, It should be filled with lead pieces. Option D

A substance's density, which measures its mass in relation to its volume, determines how much gravitational force it produces.

Lead bits are one of the suggested materials, and they are the one that would most likely boost the gravitational force. The density of lead is much higher than that of the other listed materials.

The high density of lead will result in an increase in the gravitational pull between the balloon and the golf ball if Jamie fills the balloon with lead bits.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Option C, The electron transition from n = 5 to n = 1 in hydrogen atom requires the largest amount of energy as it is moving from a higher energy state to a lower energy state, thus overcoming the highest amount of electrostatic force of attraction to the nucleus.

In the hydrogen atom, the energy of an electron is related to its distance from the nucleus, which is characterized by the principal quantum number (n). As the distance of an electron from the nucleus increases, its energy decreases. Therefore, the electron transition that requires the largest amount of energy is when an electron jumps from the state with the lowest principal quantum number to the state with the highest principal quantum number.

From the options given, the transition that requires the largest amount of energy is c. From n = 5 to n = 1 because, in this case, the electron is transitioning from the state with the highest principal quantum number (n = 5) to the state with the lowest principal quantum number (n = 1). This transition requires the largest amount of energy because the electron must overcome the highest amount of electrostatic force of attraction to the nucleus.

It's important to notice that all the other options (a. from n=1 to n=2, b. from n=2 to n=3, d. from n=3 to n=5) are transitions that go to a lower n, meaning that the electron is getting closer to the nucleus and therefore lower energy state.

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Answer:   3 mol oxygen.

Explanation:       Because by definition you have 1 mol of potassium nitrate. Potassium nitrate in this quantity comprises 1 mol K, 1 mol N,

Answer:

Explanation:

To calculate the mass of carbon dioxide (CO2) produced by a quarter gallon of gasoline, we'll need the following information:

1. The molar mass of carbon dioxide (CO2): approximately 44.01 grams/mol.

2. The molarity of gasoline: 0.923 M.

3. The volume of gasoline: 1000 mL.

First, we need to convert the volume of gasoline from milliliters (mL) to liters (L):

1000 mL = 1000/1000 = 1 L

Next, we can use the equation relating molarity, volume, and number of moles:

Molarity (M) = Moles (mol) / Volume (L)

Rearranging the equation, we can solve for moles:

Moles (mol) = Molarity (M) * Volume (L)

Moles (mol) = 0.923 M * 1 L = 0.923 mol

Finally, we can calculate the mass of carbon dioxide produced by multiplying the number of moles by the molar mass:

Mass (g) = Moles (mol) * Molar mass (g/mol)

Mass (g) = 0.923 mol * 44.01 g/mol ≈ 40.60 g

Therefore, approximately 40.60 grams of carbon dioxide are produced by burning a quarter gallon of gasoline.

The gesture of Arjuna standing at Krishna's feet with folded arms represents the aspect of Arjuna's character known as

Humility is an aspect of Arjuna's character that is represented by his gesture of standing at Krishna's feet with folded arms. Humility is the quality of being humble, which is the ability to show modesty, kindness, and an appreciation of the worth of others.

According to the Bhagavad Gita, humility is a highly regarded virtue and is one of the essential qualities that a person should have. It is said that by cultivating humility, a person can overcome many of the obstacles and difficulties that life throws their way. Humility is also believed to be the key to true knowledge and wisdom.

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Answer:

176

Explanation:

M1V1 =M2V2

200 X 0.880

The flow of electrons during this process stage Pushing Instructions for Arrows.

\($$\mathrm{X} \mathrm{OH} \mathrm{OH}\mathrm{H}_3 \mathrm{C} \mathrm{HaCl}_3 \mathrm{CH}_3$\)

To depict how electrons are moving throughout this stage of the process, draw curving arrows.

The mobility of an electron during a bond-making or bond-breaking process is depicted by curved arrows. The location of the electron or electron pair's origin is shown by the foot of the arrow, and their destination is indicated by the head of the arrow.

The shorthand for describing how electrons are moving in a process is "arrow pushing." The electron-rich chemical serves as the starting point for an arrow, while the electron-deficient compound serves as its destination.

A negatively charged subatomic particle known as an electron can either be free or attached to an atom. One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom. Protons, neutrons, and electrons collectively

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Answer:

I dont see the answers

Explanation:

Answer:

The answer is 30%

The temperature at the beginning and the end of a change of state correct option is : The temperature is usually the same.

The correct option is: The temperature is usually the same.

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The temperature at the beginning of a change is always lower than the temperature at the end of the change option A

The temperature doesn't vary during a phase transition, such as melting or boiling, until the phase change is finished. This is so that intermolecular forces can be broken rather than the average kinetic energy of the particles, which is related to temperature, being increased by the heat energy being applied to the substance.

But the temperature does increase from one point to the other on the heating curve.

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Answer:

For completely converting 6.34 moles of hydrogen to ammonia, 2.11 moles of Nitrogen is required.

The chemical reaction for the formation of ammonia by nitrogen and hydrogen reaction has been as follows:

For the formation of 2 moles of ammonia, 3 moles of hydrogen, and 1 mole of nitrogen s required.

The utilization of 3 moles of hydrogen requires 1 mole of Nitrogen.

So, the utilization of 6.34 moles of hydrogen requires:

3 moles Hydrogen = 1 -mole Nitrogen

6.34 moles hydrogen =  moles of Nitrogen

6.34 moles of hydrogen requires = 2.11 moles of Nitrogen.

For completely converting 6.34 moles of hydrogen to ammonia, 2.11 moles of Nitrogen is required.

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rating answer section

Answer rating5.0

(20 votes)

Answer

The moles of O2 in the sample = 4.71 mol

Explanation

Given:

Temperature, T = 294 K

Pressure, P = 3.55 atm

Volume, V = 32.0 L

The ideal gas constant, R = 0.0821 L*atm/mol*K

What to find:

The number of moles, n of O2 in the sample.

Solution:

The number of moles, n of O2 in the sample can be calculated using the ideal gas equation.

Plugging the values of the parameters into the formula, we have;

The number of moles, n of O2 in the sample = 4.71 mol

The non-metal elements in Group 7 – known as the halogens – get less reactive as you go down the group

Answer & Explanation:

The reactivity of elements in Group VII, also known as Group 17, decreases with increasing atomic radius. This is because halogens have high electronegativities and a proclivity to gain electrons in noble gas configurations. Myths are traditional stories or beliefs that explain cultural or societal beliefs, customs, or natural phenomena. They can be passed down through generations and can be based on true or fictitious events. Mythology, on the other hand, is the collection of myths associated with a specific culture or religion. Mythology can be amplified through retelling, incorporation into religious practices; association with significant events or figures, and adaptation into other media forms such as literature, film, or art.

Taking into account the reaction stoichiometry, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

In first place, the balanced reaction is:

N₂H₄ + 2 H₂O₂ → N₂ + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 34 grams of H₂O₂ reacts with 32 grams of N₂H₄, 8.73 grams of H₂O₂ reacts with how much mass of N₂H₄?

\(mass of N_{2} H_{4} =\frac{8.73 grams of H_{2} O_{2}x 32 grams of N_{2} H_{4} }{34grams of H_{2} O_{2}}\)

mass of N₂H₄= 8.22 grams

But 8.22 grams of N₂H₄ are not available, 5.16 grams are available. Since you have less mass than you need to react with 8.73 grams of H₂O₂, N₂H₄ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of N₂H₄ form 28 grams of N₂, 5.16 grams of N₂H₄ form how much mass of N₂?

\(mass of N_{2} =\frac{5.16 grams of N_{2} H_{4} x28 grams of N_{2}}{32 grams of N_{2} H_{4} }\)

mass of N₂= 4.515 grams

Then, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

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Answer:

The answer is A: (more below)

Liquid A: Neutral

Liquid B: Acid

Liquid C: Base

Explanation:

Ph scale: 1 - 6 are acids, 7 is neutral, 8 - 14 are bases.  

14

13

12

11

10

9

8

7

6

5

4

3

2

1

Answer: I believe the answer is A, heat moves from warmer objects to cooler objects. I know for sure it isn’t C or D though so A

The heat is transferred from one object to another as heat moves from warmer objects to cooler objects. The correct option is A.

There are three ways to transfer heat. They are conduction, convection, and radiation. Heat travels from one body to another body. If the temperature of two objects is different, then the heat travels from higher temperature to lower temperature.

Conduction is the transfer of energy when two objects ate in contact with each other. Convection is a transfer between object and environment. Radiation is when transferred by emission of electromagnetic radiation.

Thus, the correct option is A. Heat moves from warmer objects to cooler objects.

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Answer:

Explanation:

Which of the following is most likely to be ductile?

a. Metal
b. Nonmetal
c. Metalloid
d. Gas

Answer: a. MetalMetal

Answer:

Decomposition

Explanation:

Because when it becomes separate it is decomposing.

Answer:

Is this question multiple choice if it is i can most likely answer it!

Explanation:

The molar mass in grams of "one mole" of each substance is:

Fe: 55.845 g/mol

\(Cl_2\): 70.906 g/mol

\(FeCl_3\): 162.204 g/mol

To calculate the molar mass in grams of "one mole" of each substance, we need to determine the atomic masses of the elements involved in the equation.

The atomic mass of iron (Fe) is 55.845 g/mol.

For chlorine (\(Cl_2\)), we need to consider that the molar mass of \(Cl_2\) is twice the atomic mass of chlorine because the formula shows that two chlorine atoms combine to form one molecule of \(Cl_2\). The atomic mass of chlorine is 35.453 g/mol, so the molar mass of \(Cl_2\) is 2 * 35.453 g/mol = 70.906 g/mol.

The formula for iron(III) chloride (\(FeCl_3\)) indicates that one mole of \(FeCl_3\)contains one mole of iron and three moles of chlorine. Therefore, we can calculate the molar mass of \(FeCl_3\)by summing the atomic masses of iron and chlorine:

Molar mass of \(FeCl_3\)= (1 * atomic mass of Fe) + (3 * atomic mass of Cl)

Substituting the values, we have:

Molar mass of \(FeCl_3\) = (1 * 55.845 g/mol) + (3 * 35.453 g/mol)

= 55.845 g/mol + 106.359 g/mol

= 162.204 g/mol

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Answer: The total partial pressure of the solution is 131.37 torr.

Explanation:

The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:

\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\) ......(1)

Given mass of glucose = 46.8 g

Molar mass of glucose = 180 g/mol

Plugging values in equation 1:

\(\text{Moles of glucose}=\frac{46.8g}{180g/mol}=0.26 mol\)

Given mass of methanol = 117 g

Molar mass of methanol = 32 g/mol

Plugging values in equation 1:

\(\text{Moles of methanol}=\frac{117g}{32g/mol}=3.66 mol\)

Mole fraction is defined as the moles of a component present in the total moles of a solution. It is given by the equation:

\(\chi_A=\frac{n_A}{n_A+n_B}\) .....(2)

where n is the number of moles

Putting values in equation 2:

\(\chi_{methanol}=\frac{3.66}{0.26+3.66}=0.934\)

Raoult's law is the law used to calculate the partial pressure of the individual gases present in the mixture. The equation for Raoult's law follows:

\(p_A=\chi_A\times p_T\) .....(3)

where \(p_A\) is the partial pressure of component A in the mixture and \(p_T\) is the total partial pressure of the mixture

We are given:

\(p_{methanol}=122.7torr\\\chi_{methanol}=0.934\)

Putting values in equation 3, we get:

\(122.7torr=0.066\times p_T\\\\p_T=\frac{122.7torr}{0.934}=131.37torr\)

Hence, the total partial pressure of the solution is 131.37 torr.