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If 74.5% of exhaled air is nitrogen, what is the partial pressure of nitrogen in exhaled air. Assume that the total pressure of exhaled air is 760 mmhg.

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XN2 = 0.745
pN2 = XN2*Ptotal
pN2 = 0.745*1 atm = 0.746 atm or
0.745*760 = ? mm = pN2

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