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Various Calculations of Thermodynamics

1. At 25 degees C, (triange)H(little o) for the combustion of liquid octane, C8H18(l) to form CO2(g) and H2O(l) is -5471kJ/mol. Calculate (triangle)E(little o) for this reaction at 25 degrees C.

2. The molar heat of vaporization of benzene, C6H6, at 1 atm is 30.8 kJ/mol. The boiling point of benzene at 1 atm is 78.3 degree C. Calculate the entropy change when 11.5g of benzene boils at the temperature.

3. The heat capacity of a bomb calorimeter, is 87.5kJ/K (this value is for the total heat capacity including that of the water jacket around the reaction chamber). If 67.2g of methane(g) is combusted under such reaction conditions, what will be the increase in temperature on the calorimeter? What if (triange)E combustion for CH4(g) is -885.4 kJ/mol?

4. The standard free energies of the formation of SO2(g) is -300.4 kJ/mol and SO3(g) is -370.4 kJ/mol. Calculate the value of the equilibrium constant at 25 degrees C for the reaction:
2SO2(g) + O2 ---------- 2SO3(g)

Solution Summary

This solution involves various calculation of thermodynamics: heat of combustion, entropy change, and equilibrium constant.