Rate of heat transfer from the combustion chamber

Question

Solve the following problem:

Q: A 6-m³ rigid tank initially contains a mixture of 1 kmol of hydrogen (H2) gas and the stoichiometric amount of air at 25°C. The contents of the tank are ignited, and all the hydrogen in the fuel burns to H2O. If the combustion products are cooled to 25°C, determine

(a) The fraction of the H2O that condenses and

(b) The heat transfer from the combustion chamber during this process.