The molar enthalpy of vaporization of methanol at its boiling point is

CHEMISTRY · Single correct · A Level · Chemistry · Energetics · Energetics

Problem

+35.2\,\text{kJ mol}^{-1}

. What is the enthalpy change when

0.150\,\text{kg}

of methanol (molar mass

32.0\,\text{g mol}^{-1}

) condenses completely at the same temperature? (a)

+1.65 \times 10^{2}\ \text{kJ}

(b)

-1.13 \times 10^{2}\ \text{kJ}

(c)

-1.65 \times 10^{2}\ \text{kJ}

(d)

-3.30 \times 10^{2}\ \text{kJ}