An insulated, rigid volume contains 0.4 lbm of fuel that is 20% methane, 30% propane, and 50%

Question:

An insulated, rigid volume contains 0.4 lbm of fuel that is 20% methane, 30% propane, and 50% butane. Stoichiometric air and the fuel are at 77 8F and 14.7 psia. Ignition occurs, and the fuel undergoes complete combustion with a final temperature of 1200 8R. Determine the final pressure, the volume, and the heat transfer.