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calculate the volume occupied by 5.25 gram of nitrogen at 26 degree Celsius and 74.2 cm of pressure

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    Assuming 74.2 cm of pressure refers to the mercury column.

    Under standard temperature and pressure (273.15°K, 100 kPa=760.06 mmHg),
    the gas constant is:
    62.364 L mmHg K−1   mol−1
    molecular mass of N2=2*14.0067=28.0134
    So
    volume occupied by 5.25 gram of nitrogen at 26 degree Celsius and 74.2 cm of pressure
    =62.364/742*(273.15+26)*(5.25/28.0134)
    =4.7 litres

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