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30 September, 23:13

At high pressures, real gases do not behave ideally. calculate the pressure exerted by 25.0 g h2 at 20.0°c in a 1.00 l container assuming in part 1 non-ideal behavior and in part 2 ideal behavior.

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  1. 1 October, 01:09
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    Van der Waals equation is as follows:

    (P + a (n/V) ²) * (V - nb) = n RT

    Moles of H₂ is calculated by dividing 25 g by 2 (molecular weight of H₂) = 12.5 moles

    Values of a and b are:

    a = 0.02444 atm L² / mol

    b = 0.0266 L / mol

    (P + 0.02444 (12.5/1) ²) * (1 - (12.5 * 0.0266)) = 12.5 * 0.0821 * 293 K

    If we solve this equation we get pressure of 412.29 atm

    With ideal gas equation we get:

    P V = n R T

    P = n * R * T / V = (12.5 * 0.0821 * 293 / 1) = 300.69 atm
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