(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.