Question

When a chemist collects hydrogen gas over water, she ends up with a mixture of hydrogen and water vapor in her collecting bottle. If the pressure in the collecting bottle is 97.1 kilopascals and the vapor pressure of the water is 3.2 kilopascals, what is the partial pressure of the hydrogen?

A.
93.9 kPa
B.
98.1 kPa
C.
100.3 kPa
D.
104.5 kPa

Answer 1

a

Step-by-step explanation:

Answer 2

The total pressure inside the bottle is due to water vapors and hydrogen both.

The total pressure is 97.1 kilopascals (kPa). The partial pressure is the contribution of any gas or vapor to the total pressure.

Water vapors has a vapor pressure of 3.2 kPa. That is the contribution coming from water vapors. The total pressure minus the water vapor pressure would give us the partial pressure of hydrogen.

The answer would be (97.1 kPa - 3.2 kPa) = 93.9 kPa.