Question: One lbm of butane (C4H10) is burned with 25 lbm of air that is at 90F and 14.7 psia. Assuming that the combustion is complete

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.

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