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A gaseous mixture is composed of 20% CO2, 40% O2 and 40% N2. What is the mass fraction of N2?(a) 0.307(b) 0.416(c) 0.529(d) 0.784

Answer» The correct option is (a) 0.307

Best explanation: Let the total moles of the mixture be 100, => mass of CO2 = 20*44 = 880 g, mass of ¬O2 = 40*16 = 640 g, mass of N2 = 40*14 = 560 g, => mass fraction of N2 = 560/(880 + 640 + 560) = 0.307.


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