Partial pressure of hydrogen gas in the mixture is 732.5 mm Hg.
Explanation:
Data given:
total pressure of the system = 755 mm Hg
partial pressure of water vapour, pwater vapour = 17.5 mmHg
partial pressure of hydrogen gas, phydrogen gas = ?
temperature of the system = 20 degrees
According to Dalton law of pressure, the pressure exerted by each gas is independent and individual.
The total pressure is the sum of partial pressures of gases present in a mixture.
Ptotal = pwater vapour + p hydrogen gas
phydrogen gas = P total - p water vapour
p hydrogen gas = 750 - 17.5
phydrogen gas = 732.5 mm Hg.
thus the partial pressure of the hydrogen gas in the mixture is 732.5 mm Hg.
