The molar heat of vaporization of water is 40.7kj/mol. How much heat must be absorbed to convert 50.0 grams of liquid water at 100°C to steam at 100°C?

Answers

Answer 1

Answer: You have to use the formula q=nΔH(vap)
q=the heat absorbed or released
n=the number of moles of the sample (in this case 2.78mol (50g/18g/mol))
ΔH(vap)=the heat of vaporization for the sample (in this case 40.7kJ/mol)

When you plug everything in you should find that 113.05kJ is needed to vaporize 50g of water. (the temperature does not change during a phase change since all of the heat absorbed is being used to break the intermolecular forces and none of it is being used to speed up the molecules).

I hope this helps. Let me know if anything is unclear.

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A beaker contains three solids: flour, sugar, and baking soda. Whichdescribes the contents of the beaker? *

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Answer: It is a Heterogeneous mixture.

Final answer:

The beaker contains a mixture of three solids, namely flour, sugar, and baking soda. These components retain their properties in the mixture and are not chemically combined.

Explanation:

The contents of the beaker can be described as a mixture. A mixture is a combination of two or more substances that are not chemically combined. In this case, the beaker contains flour, sugar, and baking soda. These are solid substances that maintain their own properties in the mixture. They're simply combined in the same space (the beaker), but they are not interacting on a molecular level to form a new substance.

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Myriah wants to use dimesional analysis to find out how many centimeters are in 1.4 meters

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The answer is going to be 140 cm because if you do 1.4 times 100 the answer is going to be 140. It will always work!!!

What is the total number of protons contained in the nucleus of a carbon 14 atom

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A carbon 14 atom would have two more neutrons than a carbon 12 atom but they would both still have 6 protons

Which statement most accurately describes the behavior of a catalyst? (A) A catalyst increases the ∆G of a reaction and hence the forward rate.
(B) A catalyst reduces the ∆H of a reaction and hence the temperature needed to produce products.
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(D) A catalyst increases the equilibrium constant and final product concentrations

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which sample, when dissolved in 1.0 liter of water, produces a solution with the highest boiling point?

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After a thorough research, the same question exists with the following choices.

(1) 0.1 mole KI
(2) 0.2 mole KI
(3) 0.1 mole MgCl2
(4) 0.2 mole MgCl2

The correct answer is (4) 0.2 mole MgCl2. IN Vant Hoff factor, it is greater for MgCl2. There are more ions.

What is the molar mass of CaSO4 ?

Answers

The molar mass of calcium sulfate (CaSO₄) is approximately 136.14 grams per mole (g/mol).

To calculate the molar mass of CaSO₄ (calcium sulfate), you need to sum up the atomic masses of all the individual atoms in the chemical formula.

The atomic masses (molar masses) of the elements are as follows:

Calcium (Ca) has a molar mass of approximately 40.08 g/mol.

Sulfur (S) has a molar mass of approximately 32.06 g/mol.

Oxygen (O) has a molar mass of approximately 16.00 g/mol.

Now, let's calculate the molar mass of CaSO₄:

Molar mass of CaSO₄ = (Molar mass of Ca) + (Molar mass of S) + 4 × (Molar mass of O)

Molar mass of CaSO₄ = 40.08 g/mol + 32.06 g/mol + 4 × 16.00 g/mol

Molar mass of CaSO₄ = 40.08 g/mol + 32.06 g/mol + 64.00 g/mol

Molar mass of CaSO₄ = 136.14 g/mol

So, the molar mass of calcium sulfate (CaSO₄) is approximately 136.14 grams per mole (g/mol).

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Ca = 40
S= 32
O=16
so... 40+32+(16X4) = 136

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