Question

A mixture of He and O2 is placed in a 4.00L flask at 32 degrees Celsius. The partial pressure of the He is 2.7 atm and the partial pressure of the O2 is 1.4 atm. What is the mole fraction of O2??

I don't understand how to do this.
mole fraction O2 = partial pressure O2/total pressure

mole fraction He = partial pressure He/total pressure.

And you thought chemistry was hard.

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