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23 June, 21:30

A sample of NaNO3 was fully decomposed into its elements, and the resulting gas was collected over water at 34°C. If the total pressure of the collected gas was 760 torr, and the vapor pressure of water at 34°C is 40.0 torr, what was the partial pressure of N2 gas in the flask?

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  1. 23 June, 22:10
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    Answer is: the partial pressure of nitrogen gas is 720.0 torr.

    The total pressure of an ideal gas mixture is the sum of the partial pressures of the gases in the mixture.

    p (mixture) = p (water) + p (nitrogen).

    p (water) = 40.0 torr; partial pressure of the water.

    p (nitrogen) = p (mixture) - p (water).

    p (nitrogen) = 760.0 torr - 40.0 torr.

    p (nitrogen) = 720.0; patial pressure of N₂.
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