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

From the following bond energies :
H $$-$$ H bond energy   : 431.37 kJ mol^$$-$$1
C $$=$$ C bond energy   : 606.10 kJ mol^$$-$$1
C $$-$$ C bond energy   : 336.49 kJ mol^$$-$$1
C $$-$$ H bond energy   : 410.50 kJ mol^$$-$$1
Enthalpy for the reaction,

will be