The hydrogen gas formed in a chemical reaction is collected over water at 30.0 ∘c at a total pressure of 734 mmhg. part a what is the partial pressure of the hydrogen gas collected in this way?

At a temperature of 30 deg C, the vapour pressure of water H2O is about 32 mm Hg. Therefore at a total pressure f 734 mm Hg, the partial pressure of the Hydrogen gas collected is:

P Hydrogen = 734 mm Hg - 32 mm Hg = 702 mm Hg