the mass in a mole is the molecular weight of the compound, in grams.
For example, the mass of a mole of carbon is 12 g because the atomic weight of carbon is 12.
So, add up all the atomic weights of your gases, multiply by how many moles, and that's your mass in grams.
How do you find the mass of a sample of air containing 78 mol of N2, 21 mol of O2, and 1 mol of Ar
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