Ethanol (molar mass ) is initially a liquid at

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

Problem

Ethanol (molar mass

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

) is initially a liquid at

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

. Calculate the heat required to convert

0.0750\,\text{kg}

of ethanol to vapor at its normal boiling point of

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

. The specific heat capacity of liquid ethanol is

2.44\,\text{J}\,\text{g}^{-1}\,^{\circ}\text{C}^{-1}

and the molar enthalpy of vaporization is

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

. Assume the vapor leaves at

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