Question

#1

The molar enthalpy of vaporization of Substance B is 28.9 kJ/mol, and its normal boiling point is 80.7 °C. What is the vapor pressure of Substance B at 22.1 °C. Respond with the vapor pressure in torr

#2

Substance D has the following properties:

ΔH_vap = 18.9 kJ/mol

ΔH_fus = 3.5 kJ/mol

T_b = 58.4 °C

T_m = -39.8 °C

Specific Heat (solid) = 3.8 J/g·°C

Specific Heat (liquid) = 2.7 J/g·°C

Specific Heat (gas) = 0.9 J/g·°C

Calculate the energy that must be removed to convert 231.8 g of substance D from a gas at 193.7 °C to a solid at -58.5°C. The molar mass of Substance D is 75 g/mol.

Answer 1