XN2 = 0.78 from the problem so XO2 = 1.00-0.78 = 0.22
pO2 = 3.3 atm = XO2*Ptotal. Solve for Ptotal.
Then pN2 = XN2*Ptotal. Solve for pN2.
Post your work if you get stuck.
A tank holds a mixture of oxygen and nitrogen gases. If the partial pressure of oxygen is 3.3 atm and the mole fraction of N2 gas X(N2) = 0.78, what are the total pressure in the tank and the partial pressure of N2?
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