During an experiment

CHEMISTRY · Subjective · A Level · Chemistry · Energetics · Energetics

Problem

During an experiment, a heater that delivers constant power of

120\,\text{W}

is used to convert liquid benzene at its normal boiling point directly to vapor. The temperature of the liquid remains constant at

80.1\,^{\circ}\text{C}

for

6.00\,\text{min}

while boiling occurs. The molar enthalpy of vaporization of benzene is

30.8\,\text{kJ}\,\text{mol}^{-1}

. Calculate the number of moles of benzene that were vaporized.