Question

What is the vapor in oxygen gas collected by water displacement at 10°C and 75 mm Hg?

Answer 1

`P_"measured"` `=` `P_"gas"+P_"SVP"`

Explanation:

Any gas collected by water displacement will contain water vapour, the so-called `"saturated vapour pressure"`. This is extensively tabulated, and fat `10""^@` `C`, `P_"SVP"=10.2*mm*Hg`

`P_"gas"` `=` `P_"measured"-P_"SVP"` `=` `75*mm*Hg-10.2*mm*Hg` `=` `??*mm*Hg`