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If 100 g of air consists of 77% by weight of nitrogen (N2, molecular weight =...

If 100 g of air consists of 77% by weight of nitrogen (N2, molecular weight = 28), and 23% by weight of oxygen (O2, molecular weight = 32), calculate (a) the mean molecular weight of air, (b) mole fraction of oxygen, (c) concentration of oxygen in mol/m3 and kg/m3, if the total pressure is 1.5 atm and the temperature is 25°C.

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