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A steel container is filled with 5.00atm of nitrogen, 2.00atm of oxygen, and 0.50atm of argon. What is the total pressure in the vessel and the mole fraction of each gas?

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Ptotal = pO2 + pAr + pN2.

XO2 = mols O2/total mols
XN2 = mols N2/total mols.
XAr = mols Ar/total mols.

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