Question

A mixture of H2 and water vapor is present in a closed vessel at 20°C. The total pressure of the system is 755.0 mmHg.

Partial pressure of water vapor at 20°C equals 17.5 mmHg.

What is the partial pressure of H2?

Answer 1

737.5

Step-by-step explanation:

Answer 2

The total pressure of a mixture of gases in a closed vessel is the sum of all the partial pressure exerted by each gas. This is in accordance with Dalton's Law of partial pressure. So, we can calculate as follows:

755 = P(H2O) + P(H2) = 17.5 + P(H2)
P(H2) = 737.5 mmHg