Chemistry Practice Problems Clausius-Clapeyron Equation Practice Problems Solution: A certain substance has a heat of vaporization of ...

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Solution: A certain substance has a heat of vaporization of 47.70 kJ/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 293K?

Problem

A certain substance has a heat of vaporization of 47.70 kJ/mol. At what kelvin temperature will the vapor pressure be 3.50 times higher than it was at 293K?

Solution

We’re being asked to determine the temperature at which the vapor pressure is 3.50 times higher than it was at 293 K, given the heat of vaporization


For this problem, we can use the Clausius-Clapeyron Equation:



where: 

P1 = vapor pressure at T1

P2 = vapor pressure at T2

ΔHvap = heat of vaporization (in J/mol)

R = gas constant (8.314 J/mol•K)

T1 and T2 = temperature (in K).


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