.The values of first ionization enthalpy of S and Cl are 1000 and `1256kJ mol^(-1)`, `1520kJ mol^(-1)`. Explain the observed trend.

Ionization enthalpy of Li is 520 Kj mol^-1 while that of F is 1681 kJ mol^-1 .Explain.

The values of DeltaH and Delta S of a certain reaction are -400 kJ mol^-1 and -20 kJ mol^-1 K^-1 respectively. The temperature below which the reaction is spontaneous is _________.

1 S m^2 mol^(-1) is equal to

1 S m^2 mol^(-1) is equals to

Standard enthalpy and standard entropy changes for the oxidation of ammonia at 298 K are -382.64 kJ mol^(-1) and -145.6 JK^(-1)mol^(-1) respectively. Standard Gibbs energy change for the same reaction at 298 K is

Bond dissociation enthalpy of F_2(158.8Kj mol^(-1)) is lower than that of Cl_2 (242.6 KJ mol^(-1)) Why?