Question

if 10^-4 dm3 of water is introduced into a 1.0 dm3 flask at 300k, how many when equilibrium is established? (vapour pressure of H2O at 300k is 3170 Pa R=8.31 J K^- mol^-​

Answer 1

Explanation:

The volume occupied by water molecules in vapour phase is (1×10 ^−4 ) dm ^3

that is approximately (1×10 ^−3 )m ^3

pvap V=n H2 O mol

3170×1×10 ^−3 =n H 2O ×8.314×300K

n H2O = 3170×1×10 ^-3/8.314×300

=1.27×10 ^−3 mol