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A mixture contains 10.0 g each of the three gases nitrogen, oxygen, and argon. What is the mole fraction of nitrogen in the mixture?

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mols N2 = grams/molar mass = ?
mols O2 = grams/molar mass = ?
mols Ar = grams/molar mass = ?
Total mols = mols N2 + mols O2 + mols Ar.

XN2 = mols N2/total mols.

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