7. Calculate the heat of following reactionN2+ 3H2—> 2NH3Given the bond energies of N =N, H-H and N¾H bonds are 226, 104 and 93 kcal respectively.8. When 2 moles of C2H6are completely burnt 3129 KJ of heat is liberated. Calculate the heat of formation,ΔHffor C2H6;ΔHffor CO2­ and H2O are-395 and-286 KJ respectively.9. Calculate the heat of formation of ethane at 25°C. The bond enthalpies for H-H, C-C and C-H bonds are 104.2 kcal, 80 kcal and 99.5 kcal respectively. Heat of vaporization of carbon is 171.7 kcal.10.Define the following terms:(a) Internal energy (b) Endothermic reaction(c)Hess law(d) Calorific value11.5 mole of an ideal gas expand isothermally & reversibly from a pressure of 10 atm to 2 atm at 300 K. What is the largest mass which can be lifted through a height of 1 mitre in this expansion?12.The equilibrium constant for the reaction:CO2(g) + H2(g)——> CO(g) + H2O at 298 K is 73. Calculate the value of the standard free energy change (R = 8.314 JK-1mol-1).13.An insulated container contains 1 mole of a liquid molar volumes 100 ml at 1 bar. When liquid is steeply passed to 100 bar, volume decrease t0 99 ml, findΔH &ΔU for the process.

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