The molar heat capacities of liquid benzene and benzene vapour are 136 and 82 J/mol-K, respectively. If the enthalpy of vaporization of benzene is 31.0 kJ/mol at 80°C, the enthalpy of vaporization at

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The molar heat capacities of liquid benzene and benzene vapour are 136 and 82 J/mol-K, respectively. If the enthalpy of vaporization of benzene is 31.0 kJ/mol at 80°C, the enthalpy of vaporization at 100°C should be about

TestHub · Accepted Answer

ΔH vap (100) = ΔH vap (80) + [C P (g) - C P (l)] ΔT = 31.0 + (82 - 136)(20)/1000 = 31.0 - 1.08 = 29.9 kJ/mol. This is option (d).

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