this question need to be don perfectly.answer is given below so match your answer before submission thanks

2. One kmol of ethane C2H6 is burned with an unknown amount of air during a combustion process. An analysis of the combustion products reveals that the combustion is complete, and there are 2 kmol of free 02 in the products. Determine: a. The AF ratio b. The percentage of theoretical air used Ans. AF = 25.3 kg air / kg fuel, %'age theoretical air=157% matrirana