Question

A sample of gas is collected over water at a temperature of 35.0°C when the barometric pressure reading is 742.0 torr. What is the partial pressure of the dry gas?

Answer 1

This site tells me that vapour pressure of water at `35.0` `""^@C` `=` `42.2*mm*Hg`.

Explanation:

`P_("collected")` `=` `P_"gas" + P_"SVP"`, `P_"SVP"` is given above, and is called the saturated vapour pressure. This should have been quoted with the question.

Thus `P_"gas"~=700*mm*Hg`.