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Trimix 10/50 is a gas mixture that contains 10% oxygen and 50% helium, ant the rest is nitrogen. If a tank of Trimix 10/50 has a total pressure of 2.07 x 10 4 kPa, then what is the partial pressure of helium?

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  1. I presume the % is by volume; therefore, mole fraction He is 0.5
    pHe = XHe*Ptotal
    SHe = 0.5
    Ptotal is given.
    Solve for for pHe.

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