Question

1. Thiophene, C4H4S, is a fairly volatile liquid with a vapor pressure of 40.0 torr at 12.5C, and its normal boiling point is 84.0C. Calculate thiophene’s enthalpy of vaporization in kJ/mol.

2. Isopropyl alcohol, (CH3)2CHOH, has a molar enthalpy of vaporization of 44.0 kJ/mol and a normal boiling point of 82.5C. Calculate the temperature at which isopropyl alcohol would have a vapor pressure of 100.0 Torr.

Answer 1

1. 225,303 kj/mol

2. 39.885055 °C