Question: One kilogram of butane (C4H10) is burned with 25 kg of air that is at 30C and 90 kPa. Assuming that the combustion is complete

One kilogram of butane (C4H10) is burned with 25 kg of air that is at 30°C and 90 kPa. Assuming that the combustion is complete and the pressure of the products is 90 kPa, determine
(a) The percentage of theoretical air used and
(b) The dew-point temperature of the products.

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