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29 May, 19:18

A 0.500 g sample of phosphorous vapor exerts a pressure of 550. torr in a 73.1 mL container at 489∘C. What is the molar mass?

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  1. 29 May, 19:23
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    Molar mass = 78.8gmol-1

    Explanation:

    P = 550torr, V = 0.0732dm3, m = 0.5g, R = 8.314, T = 273+489 = 762K

    Applying

    PV = m/Mm * (R*T)

    Substitute and Simplify

    Mm = 78.8gmol-1
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