Liquid octane (C8H18) at 77F is burned completely during a steady-flow combustion process with 180 percent theoretical

Question:

Liquid octane (C8H18) at 77°F is burned completely during a steady-flow combustion process with 180 percent theoretical air that enters the combustion chamber at 77°F. If the products leave at 2500 R, determine
(a) The air–fuel ratio and
(b) The heat transfer from the combustion chamber during this process.