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Calculate the average molecular weight of air: (1) from its approximative molar composition of 78.08% nitrogen, 20.95% oxygen, 0.93% argon (and remaining is carbon dioxide)

Calculate the average molecular weight of air:

(1) from its approximative molar composition of 78.08% nitrogen, 20.95% oxygen, 0.93% argon (and remaining is carbon dioxide)

(2) from its approximative composition by mass of 76.08% nitrogen, 23.05% oxygen, 0.83% argon (and remaining is carbon dioxide).

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