Any fuel-oxygen mixture that contains more oxygen than is needed to burn the fue

Question

Any fuel-oxygen mixture that contains more oxygen than is needed to burn the fuel completely is called a lean mixture, and a mixture containing too little oxygen to allow complete combustion of the fuel is called a rich mixture. A high-performance heater that burns propane, C3H8(g), is adjusted so that 100.0 g of O2(g) enters the system for every 100.0 g of propane. Is this mixture rich or lean?

Explanation / Answer

2C4H10 + 13O2 --> 8CO2 + 10H2O 57.4g C4H10 / 58g/mole = 1mole C4H10 the theoretical yield of CO2: 1mole C4H10 (8CO2 / 2C4H10) x 44g/mole = 174.18g actual yield = 108.4g % yield = actual / theoretical x 100% = 108.4g / 174.8g x 100% = 62.23% yield C3H8 + 5O2 --> 3CO2 + 4H2O 100g C3H8 / 44g/mole = 2.273moles propane 100g O2 / 32g/mole = 3.125moles O2 2.73moles propane x (5O2 / 1C3H8) = 13.65moles O2 required rich

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