Answer : The partial pressure of dry hydrogen gas is, 98.26 kPa
Explanation :
According to the Dalton's law, the total pressure of the gas is equal to the sum of the partial pressure of the mixture of gasses.
[tex]P_T=p_{H_2O}+p_{H_2}[/tex]
where,
[tex]P_T[/tex] = total partial pressure = 0.989 atm = 100.2 kPa
Conversion used : (1 atm = 101.3 kPa)
[tex]P_{H_2O}[/tex] = partial pressure of water gas = 1.94 kPa
[tex]P_{H_2}[/tex] = partial pressure of dry hydrogen gas = ?
Now put all the given values is expression, we get the partial pressure of the dry hydrogen gas.
[tex]100.2kPa=1.94kPa+p_{H_2}[/tex]
[tex]p_{H_2}=98.26kPa[/tex]
Therefore, the partial pressure of dry hydrogen gas is, 98.26 kPa