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22 September, 17:18

A 500. mL sample of oxygen is collected over 20.0∘C water at 760. torr. If the vapor pressure of water at 20∘C is 23.8 torr, what is the vapor pressure of the dry oxygen gas?

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  1. 22 September, 18:08
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    Answer : The vapor pressure of the dry oxygen gas is, 736.2 torr

    Explanation : Given,

    Volume of sample of oxygen = 500 mL

    Vapor pressure of oxygen + water = 760 torr

    Vapor pressure of water = 23.8 torr

    Now we have to determine the vapor pressure of the dry oxygen gas.

    Vapor pressure of the dry oxygen gas = Vapor pressure of (oxygen + water) - Vapor pressure of water

    Vapor pressure of the dry oxygen gas = 760 torr - 23.8 torr

    Vapor pressure of the dry oxygen gas = 736.2 torr

    Thus, the vapor pressure of the dry oxygen gas is, 736.2 torr
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