Air is about 78% nitrogen gas (n2) by mass. the molar mass of nitrogen gas is 28.0 g/mol. a 100.0-g sample of air contains how many moles of nitrogen

2.78 moles of nitrogen gas present in 100 grams of air.

Explanation:

Mass of the air = 100.0 g

Percentage of nitrogen gas in air = 78 %

Mass of nitrogen gas in 100 g of air = 78% of Mass of air =

Moles of Nitrogen gas:

There are 2.78 moles of nitrogen gas present in 100 grams of air.

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