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3 March, 11:10

If nitrogen gas is collected over water at 20 o C and the total pressure of the gas in the collection vessel is 200 kPa, what is the pressure of dry nitrogen gas?

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  1. 3 March, 14:15
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    pressure of dry nitrogen gas at 20° = Partial pressure of nitrogen and partial pressure of water at that temperature.

    The pressure of dry nitrogen gas = total pressure - vapour pressure of water at 20°C

    = 200 k Pa - 2.34 k Pa

    = 197.66 kPa.
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