An unknown molecular solid has a vapor pressure of at (303 K) and at (318 K)

CHEMISTRY · Single correct · AP · Chemistry · Thermochemistry · Thermochemistry

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}

(b)

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

(c)

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

(d)

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