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How can you measure the amount of a gas?

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    Know the volume of the container, V. Measure the pressure, P, and the temperature, T. Then use the ideal gas law n = PV/RT
    n is the number of moles of gas. That formula works no matter what the gas is.

    If you need to know the particular amount one type of gas in a mixture, various analytical methods can be used, such as spectroscopy, cryotrapping or chemical means.

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