Standard enthalpy of vapourisation for \( \mathrm{CCl_4} \) is \( 30.5 \, \mathrm{kJ \, mol^{-1}} \). Heat required for vapourisation of \( 284 \, \mathrm{g} \) of \( \mathrm{CCl_4} \) at constant temperature is ___ \( \mathrm{kJ} \).
(Given molar mass in \( \mathrm{g \, mol^{-1}} \): \( \mathrm{C} = 12 \), \( \mathrm{Cl} = 35.5 \))
