Given:
Atmospheric pressure = 99.4 kPa
Temperature = 23 C
To determine:
The pressure of H2 gas collected over water
Explanation:
Based on Dalton's Law of partial pressures
P(total) = P(water) + P(H2)
PH2 = Ptotal - Pwater
where: Ptotal = atmospheric pressure = 99.4 kPa
Pwater = vapor pressure of water at 23 C = 2.81 kPa
PH2 = 99.4 - 2.81 = 99.59 kPa
Ans: The pressure of H2 gas is 99.6 kPa
