(a) Give the formula indicating the relationship between entropy, free energy and enthalpy changes of a system.
(b) For each of the following, state whether entropy change is positive, negative or zero.
(i) H\(_2\)O\(_{(g)}\) -> H\(_2\)O\(_{(g)}\)
(ii) Cl\(_{2(g)}\) —> 2CI\(_{(g)}\)
(iii) HCI\(_{(g)}\) -> HCl\(_{(g)}\)
Explanation
(a) \(\Delta\)C = \(\Delta\)H - T\(\Delta\)S
(free energy) (enthalpy) (Temperature x Entropy)
(b)(i) Entropy is positive
(ii) Entropy is positive
(iii) Entropy is negative.