CHEMISTRY

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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

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