At , ethanol boils at . The molar enthalpy of vaporization of ethanol at its normal…

CHEMISTRY · Multi-part · AP · Chemistry · Thermodynamics and Electrochemistry · Thermodynamics and Electrochemistry

Problem

1\,\text{atm}

, ethanol boils at

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

. The molar enthalpy of vaporization of ethanol at its normal boiling point is

\Delta H_{\text{vap}} = 38.6\,\text{kJ}\,\text{mol}^{-1}

. (a) Calculate the molar entropy change,

\Delta S

, for the system when

1.00

mol of ethanol is converted from liquid to vapor at

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

. (b) Explain the sign and relative magnitude of the calculated

\Delta S

in part (a) in terms of molecular freedom of motion and spatial dispersal.