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

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

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

For melting of ice at 25^@C the enthalpy of fusion is 6.97 kj mol^(-1) and entropy of fusion is 25.4 JK-1 mol^(-1) . Calculate free energy change and predict whether melting of ice is spontaneous or not at this temperature.

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