Hydrogen is collected over water at 0.975 atm and 28°C. What is the partial pressure of #H_2#?

1 Answer
Apr 24, 2018

Answer:

Well, we need the #"saturated vapour pressure"#, #P_"SVP"#, of water at #301.15*K#

Explanation:

#P_"measured"=P_"dihydrogen"+P_"SVP"#

#P_"dihydrogen"=P_"measured"-P_"SVP"#

This site gives #P_"SVP"=28*mm*Hg# at #25# #""^@C#. These data SHOULD have been supplied with the question.

And so..............................

#P_"dihydrogen"=0.975*atm-(28*mm*Hg)/(760*mm*Hg*atm^-1)=0.938*atm#