For vaporization of water at 1 atmospheric pressure, the values of $$\Delta $$H and $$\Delta $$S are 40.63 kJ mol^$$-$$1 and 108.8 J K^$$-$$1 mol^$$-$$1, respectively. The temperature when Gibb's energy change ($$\Delta $$G) for this transformation will be zero, is

Three moles of an ideal gas expanded spontaneously into vacuum. The work done will be

For an endothermic reaction, energy of activation is E_a and enthalpy of reaction is $$\Delta $$H (both of these in kJ/mol). Minimum value of E_a will be

Standard entropies of X₂, Y₂ and XY₃ are 60, 40 and 50 J K^$$-$$1 mol^$$-$$1 respectively. For the reaction

1/2X₂ + 3/2Y₂ $$\rightleftharpoons$$ XY₃, $$\Delta $$H = $$-$$ 30 kJ,

to be at equilibrium, the temperature should be