Question

PLEASE HELP !!

Calculate the enthalpy of vaporization for
the phase change from gaseous
methanol to liquid methanol.
CH3OH(g) → CH3OH (1)

Answer 1

To calculate the enthalpy of vaporization for the phase change from gaseous methanol to liquid methanol:

1. Determine the standard enthalpy of formation of both states: CH3OH (g) is -201.8 kJ/mol and CH3OH (l) is -238.7 kJ/mol.

2. Subtract the standard enthalpy of formation of the liquid state from the standard enthalpy of formation of the gaseous state: -201.8 kJ/mol -(-238.7 kJ/mol) = 36.9 kJ/mol.

3. The enthalpy of vaporization for the phase change from gaseous methanol to liquid methanol is 36.9 kJ/mol.