A sample of gas is collected over water at a temperature of 27.0°C when the barometric pressure reading is 750.0 mm Hg. What is the partial pressure of the dry gas?

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A sample of gas is collected over water at a temperature of 27.0°C when the barometric pressure reading is 750.0 mm Hg. What is the partial pressure of the dry gas?

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Answer 1 · 2016-01-09T20:47:49

The partial pressure of the collected gas is $750$ $mm$ $Hg$ LESS the saturated vapour pressure of water at $27.0$ $""^@C$ .

Explanation:

The saturated vapour pressure of water at $27.0$ $""^@C$ ( $300$ $K$ ) is [approx.](http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/watvap.html) $28$ $mm$ $Hg$ . The actual value should of course have been quoted with the problem. Thus the partial pressure of the gas is $750.0$ $mm$ $Hg$ $-$ $28$ $mm$ $Hg$ $=$ $722$ $mm$ $Hg$ .

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A sample of gas is collected over water at a temperature of 27.0°C when the barometric pressure reading is 750.0 mm Hg. What is the partial pressure of the dry gas?

1 Answer

Explanation:

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