Question

The vapor pressure of water and the partial pressure of hydrogen contribute to the total pressure of 715 torr. What is the partial pressure of just H2(g) in atmospheres?

Answer 1

Answer:

0.91 atm is the partial pressure of just hydrogen gas.

Explanation:

Vapor pressure of water , p= 0.0313 atm

Partial pressure of hydrogen gas = $p_{H_2}$

Total pressure of the water vapors and hydrogen gas = P = 715 Torr

1 atm = 715 Torr

$715 Torr=\frac{715}{760} atm=0.94 atm$

According Dalton's law of partial pressure:

$P=p+p_{H_2}$

$0.94 atm=0.0313 atm+p_{H_2}$

$p_{H_2}=0.94 atm - 0.0313 atm =0.9087 atm \approx 0.91 atm$

0.91 atm is the partial pressure of just hydrogen gas.