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What is the mean molecular weight of air?

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in Engineering Chemistry II by (789k points)
What is the mean molecular weight of air?

(a) 28.95

(b) 26.4

(c) 30.98

(d) 24.65

This question was posed to me in quiz.

My question comes from Numerical Problems Based on Combustion and Fuel Gas Analysis topic in portion Fuels and Combustion of Engineering Chemistry II

1 Answer

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Right answer is (a) 28.95

Best explanation: The mean molecular weight of air can be calculated by taking the mean of the total mass of all the gases present in air, i.e., nitrogen, oxygen and argon. Considering 21 moles of oxygen, 78.06 moles of nitrogen and 0.94 moles of argon, weight of air can be calculated.

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