Standard enthalpy of vaporisation $$\Delta $$_vapH^o for water at 100^oC is 40.66 kJ mol^$$-$$1. The internal energy of vaporisation of water at 100^oC (in kJ mol^$$-$$1) is

In which of the following reactions, standard reaction entropy change ($$\Delta $$S^o) is positive and standard Gibb's energy change ($$\Delta $$G^o) decreases sharply with increasing temperature ?

Consider the following processes :

	H (kJ/mol)
1/2A $$ \to $$ B	+150
3B  $$ \to $$ 2C + D	-125
E + A  $$ \to $$ 2D	+350

For B + D $$ \to $$ E + 2C, $$\Delta $$H will be

Which of the following is correct option for free expansion of an ideal gas under adiabatic condition ?