a) Predict whether entropy increases or decreases in the following changes:
i) `l_2(S)rightarrowl_2(g)`
ii) Temperature of a crystalline solid is raised from 0 K and 115 K.
iii) Freezing of water
b) Calculate the enthalpy of combustion of methane. Given that standard enthalpies of formation of `CH_4,CO_2` and `H_2O` are `-75.2, -394` and `-285.6` kJ/mol respectively.

Explanation

Entropy increases