Question

The same housemate that used all your hot water turned on your backyard grill and left it on until the propane tank was empty. Assuming that you initially had a full tank of propane (5 gallons), what was the gross heat released from burning all of the propane? Propane (CsH.) has a standard enthalpy of -103.8 kJ/mol and a density of 4.23 lb/gal. See lecture notes for other standard enthalpy constants.

Answer 1

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It was given that, 5 gallons of propane is available for combustion Density of weight of propane = = 4.23 1blgas propane available su (4.23 4.6) (5g01) 21.15 pounds Molecular weight of propane cz H& = 3(12) + 8(1) - 44 grans Total number of moles of propane available 2015 pounds (21.15) (453.592) gr 44 grams 44 gr 218.033 moles are available to bum Given standard enthalpy of propanes 103.8 kJ/moles Total heat released = (103-8) (218-033) KJ - 22631.83 KJ

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