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11 February, 17:15

You fill a rigid steel cylinder that has a volume of 20.0 L with nitrogen gas to a final pressure of 2.00 * 10^4 Kpa at 28c How many kilograms of N2 does the cylinder contain

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  1. 11 February, 19:27
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    This problem can easily be solved using the ideal gas equation which states:

    PV = nRT

    where:

    P = pressure

    V = volume

    n = no. of moles

    R = gas constant

    T = absolute temperature

    The problem already gives the pressure, volume, and temperature of the system. All that's missing is the number of moles which is related to the mass using:

    mass = moles x molecular mass

    The R that should be used must have units that are consistent with the given data. The value used is 8314.34 L-Pa/mol-K. The answer is 4.475 kg of N2.
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