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Question

Dry air has a molar composition of 22% O2 and 78% N2. Calculate the average molecular weight of dry air.

A
28.4 g/mol
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B
25.8 g/mol
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C
28.9 g/mol
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D
27.9 g/mol
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Solution

The correct option is C 28.9 g/mol
The molecular mass of O2 and N2 are 32 g/mol and 28 g/mol respectively.
Average molecular weight =(32×0.22)+(28×0.78)
=28.88 g/mol or 28.9 g/mol

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