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Liquified petroleum gas (LPG) is a mixture of propane and butane used for home h

ID: 857079 • Letter: L

Question

Liquified petroleum gas (LPG) is a mixture of propane and butane used for home heating, barbeque grills, etc. LPG that is 60 mol% propane and 40 mol% butane is burned at a rate of 0.5 L/hr with 25% excess air (21% O2, 79% N2). Fractional conversion of 90% of the propane and 85% of the butane is achieved; of the propane and butane that react, 95% is completely combusted (goes to CO2) and the remainder goes to CO (incomplete combustion). The combustion gas leaves at a temperature of 300 °C at a gauge pressure of 0.2 atm. The specific gravities of propane and butane are 0.493 and 0.573, respectively.
a) Determine the molar flow rates of propane and butane entering the combustion process.
b) Write balanced reactions for the complete and incomplete combustion of propane and butane
c) What is the volumetric flow rate of air to the combustion process in L/min at STP. d) Whatisthevolumetricflowrateoftheexhaustgas?
e) What is the concentration of CO (ppm) in the exhaust gas?

Explanation / Answer

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