# CHEMISTRY

posted by .

I know this question is already on here but the answer wasn't helpful to me.

Liquid Sodium can be used as a heat transfer fluid. Its vapor pressure is 40.0 torr at 633 C and 400.0 torr at 823 C. Calculate its heat of vaporization.

• CHEMISTRY -

I looked and did not see another post of this problem; therefore, I don't know what was confusing you. Wouldn't you use the Clausius-Clapeyron equation?

• CHEMISTRY -

I'm just not sure how to apply it to this problem.

• CHEMISTRY -

To apply it you simply plug in the numbers, punch them into your calculator, turn the crank and out comes the answers.
ln(p2/p1) = [DHvap/R](1/T1 - 1/T2)
You have p1 @ T1 and p2 @ T2. R is 8.314, solve for DHvap. The unit for DHvap will be joules.

• CHEMISTRY -

100.016 or 1.00 x 10^2 kj/mol

## Similar Questions

1. ### Ap Chemistry

at 25 degrees Cliquid A has a vapor pressure of 100.0 torr, while liquid B has a vapor pressure of 200.0 torr. The heat of vaporization of liquid A is 32.0 kJ/mol and that of liquid b is 18.0 kJ/mol. At what celsius temperature will …
2. ### AP CHEM-URGENT PLEASE

at 25 degrees C liquid A has a vapor pressure of 100.0 torr, while liquid B has a vapor pressure of 200.0 torr. The heat of vaporization of liquid A is 32.0 kJ/mol and that of liquid b is 18.0 kJ/mol. At what celsius temperature will …
3. ### Chem again sorry

A solution of sodium chloride in water has a vapor pressure of 18.3 torr at 25°C. What is the mole fraction of NaCl in this solution?
4. ### Chemistry!!!~!!

A solution of sodium chloride in water has a vapor pressure of 18.5 torr at 25°C. What is the mole fraction of NaCl in this solution?
5. ### College Chemistry

A sample of octane in equilibrium with its vapor in a closed 1.0 L container has a vapor pressure of 50 torr at 45oC. The container’s volume is increased to 2.0 L at constant temperature and equilibrium is re-established. What is …
6. ### Chemistry II

Liquid sodium can be used as a heat transfer fluid. It's vapor pressure is 40.0 torr @ 633 degrees C and 400.0 torr @ 823 degreees C. Calculate it's heat vaporization.
7. ### chem

A 2.30 L sample of O2(g) was collected over a liquid at a total pressure of 785 torr and 25°C. When the O2(g) was dried (vapor of that liquid removed), the gas had a volume of 1.93 L at 25°C and 785 torr. Calculate the vapor pressure …
8. ### Chemistry

Given that the vapor pressure of water is 17.54 torr at 20 C, calculate the vapor-pressure lowering of aqueous solutions that are 2.40 m in (a) sucrose, C12H22O11, and (b) aluminum chloride. Assume 100% dissociation for electrolytes. …
9. ### CHEMISTRY

if a pure liquid in a sealed container is in equilibrium with its own vapor, the dependence of the vapor pressure on the temperature and the heat of vaporization is governed by the Clausius-Clapeyron equation. what is the heat of vaporization …
10. ### chemistry

what is the heat of vaporization if the vapor pressure of liquid water at 25 °C is 23.8 Torr and at a boiling point of 100 °C is 760 Torr.

More Similar Questions