At 298 K, the enthalpy of fusion of a solid (X) is and the enthalpy of vaporisation of the liquid (X) is . The enthalpy of sublimation of the substance (X) in is (in nearest integer).

Question

At 298 K, the enthalpy of fusion of a solid (X) is  and the enthalpy of vaporisation of the liquid (X) is . The enthalpy of sublimation of the substance (X) in  is  (in nearest integer).

Canvas Classes · Accepted Answer

Strategy:
 Apply Hess's Law. The phase change from solid to gas (sublimation) is the sum of the changes from solid to liquid (fusion) and liquid to gas (vaporization).

Step 1: Sum the enthalpies

.

More questions from Thermodynamics