Question

What is the partial pressure of water vapor in oxygen gas collected by water displacement at 10°C and 750 mm Hg?

Answer 1

You want the saturated vapour pressure, `P_"SVP"`.

Explanation:

This is a function of temperature only, and at `283*K` this site reports that the vapour pressure of water, `P_"SVP"`, is `9.2*mm*Hg`.

And so, `P_"Measured"=P_"gas"+P_"SVP"`,

`P_"Gas"=P_"Measured"-P_"SVP"`

`750*mm*Hg-9.2*mm*Hg=741.8*mm*Hg` `=` `??*atm`