How many moles o2 of are present? the mole fraction of in, Ask an Expert

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If the cylinder is full of air at 76 degree C and 0.970 atm , how many moles O2 of are present? (The mole fraction of in dry air is 0.2095.) How many grams of C8H18 could be combusted by this quantity of O2 , assuming complete combustion with formation of CO2 and H2O?

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