A fuel gas containing 85.0 mole% methane and the balance ethane is burned completely with pure oxygen at 25°C and the products are brought back down to 25°C.

(a) Suppose the reactor is continuous. Take a basis of calculation of 1 molls of the fuel gas assume some value for the percent excess oxygen fed to the reactor (the value you choose will not affect the results), and calculate —Q(kW), the rate at which heat must be transferred from the reactor.

(b) Now suppose the combustion takes place in a constant-volume batch reactor. Take a basis of calculation of 1 mol of the fuel gas charged into the reactor, assume any percent excess oxygen, and calculate – Q (kJ).

(c) Briefly explain why the results in parts (a) and (b) do not depend on the percent excess O2 and why they would not change if air rather than pure oxygen were fed to the reactor,