Problem: Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 oC. At what temperature does benzene boil when the external pressure is 450 torr?

FREE Expert Solution

We’re being asked to determine the temperature at which benzene boil when the external pressure is 450 torr


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


lnP2P1 = -HvapR[1T2-1T1]


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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Problem Details
Benzene has a heat of vaporization of 30.72 kJ/mol and a normal boiling point of 80.1 oC. At what temperature does benzene boil when the external pressure is 450 torr?

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