Naphthalene has a molar enthalpy of sublimation of at its sublimation temperature

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

Problem

Naphthalene has a molar enthalpy of sublimation of

72\;\text{kJ mol}^{-1}

at its sublimation temperature. What is the heat change, including sign, when

0.50\;\text{mol}

of gaseous naphthalene deposits as a solid under these conditions? (a)

-\!72\;\text{kJ}

(b)

+\!36\;\text{kJ}

(c)

-\!36\;\text{kJ}

(d)

-\!144\;\text{kJ}