Problem on enthalpy of formation


Assignment:

a) Use only the following data to determine ΔH°f for NO2 (g):

ΔH°f for NO (g) is +90.4 kJ/mol
ΔH = –56.6 kJ/mol for the reaction: NO (g) + 1/2 O2 (g) → NO2 (g)

b) Find ΔH for the reaction: 4 CO (g) + 2 NO2 (g) → 4 CO2 (g) + N2 (g) using only your answer to (a) and the fact that ΔH = –283.0 kJ/mol for the reaction: CO (g) + 1/2 O2 (g) → CO2 (g)

c) A 10.0-liter vessel contains 5.0 atm of CO and 3.0 atm of NO2 at 25°C. How much heat (in Joules) will be liberated if this is allowed to react to completion according to the reaction in part (b)?

d) Calculate ΔH for the combustion of C4H10 (l).

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