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show steps please 5. Calculate the average molecular weight of air (1) from its approximate molar composition of 79%N2,21%O2 and (2) from its approximate composition

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5. Calculate the average molecular weight of air (1) from its approximate molar composition of 79%N2,21%O2 and (2) from its approximate composition by mass of 76.7%N2,23.3% O. (20pts)

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