Question

A certain experiment generates hydrogen gas, which is collected over water. The temperature is 283 K and the atmospheric pressure is 0.97 atm. What is the partial pressure of H2?

Answer 1

partial pressure of H2 = 0.9574 atm OR 727.6 mmHg

Step-by-step explanation:

in case of collection of gas over water:


`P_(atm) = P_(vapor) + P{gas}`


`P_(atm)`: atmospheric pressure


`P_(vapor)`: pressure of water vapor (must be given in the question!)


`P_(gas)`: pressure of gas

in this question:

water vapor pressure at 283K (10°C) = 9.6 mmHg (again, this must be given in the question)

Given:
`P_(atm)` = 0.97 atm = 737.2 mmHg

by substitution in the formula:

737.2 = 9.6 +
`P_(H_2)`


`P_(H_2)` = 727.6 mmHg = 0.9574 atm