Discuss the below in detail:
Q: One lbm of butane (C4H10) is burned with 25 lbm of air that is at 90°F and 14.7 psia. Assuming that the combustion is complete and the pressure of the products is 14.7 psia, determine
(a) The percentage of theoretical air used and
(b) The dew-point temperature of the products.