Chemistry

Problem

An unknown molecular solid has a vapor pressure of

1.2\,\text{torr}

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

(303 K) and

4.8\,\text{torr}

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

(318 K). Using these data, which of the following values is closest to the enthalpy of sublimation,

\Delta H_{\text{sub}}

, of the solid? a)

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

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

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

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