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MCAT Question A Day - 3/10/14 - Answer!

A gas mixture containing 1 mole of H2 and 3 moles of N2 has a total pressure of P atm. Which of the following are the partial pressures of each gas?

A.  N2: 3 atm; H2: 1 atm
B.  N2: (2P/3) atm; H2: (P/3) atm
C.  N2: (P/3) atm; H2: (2P/3) atm
D.  N2: (3P/4) atm; H2: (P/4) atm

The correct answer is (D). Use Pi = XiPT where X(N2) = 3/(3 + 1) and X(H2) = 1/(3 + 1).

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