Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64 kJ mol-1 and -145.6 kJ mol-1 respectively. Standard Gibb's energy change for the same reaction at 298 K is
(a) -221.1 kJ mol-1
(b) - 339.3 kJ mol-1
(c) - 439.3 kJ mol -1
(d) - 523.2 kJ mol-1
