Question

A mixture of oxygen, nitrogen, and hydrogen gases exerts a total pressure of 74 kPa. The partial pressure of the oxygen is 21 kPa, and the partial pressure of the nitrogen is 45 kPa. What is the partial pressure of the hydrogen gas in this mixture?

a) 74 kPa
b) 21 kPa
c) 45 kPa
d) 8 kPa

Answer 1

The partial pressure of a gas in a mixture can be calculated using Dalton's Law of Partial Pressures. According to this law, the total pressure of a gas mixture is equal to the sum of the partial pressures of each component gas. The partial pressure of hydrogen gas in the mixture is 8 kPa.

Step-by-step explanation:

The partial pressure of a gas in a mixture can be calculated using Dalton's Law of Partial Pressures. According to this law, the total pressure of a gas mixture is equal to the sum of the partial pressures of each component gas. In this case, the total pressure of the mixture is 74 kPa, the partial pressure of oxygen is 21 kPa, and the partial pressure of nitrogen is 45 kPa.

Therefore, to find the partial pressure of hydrogen, we can subtract the sum of the partial pressures of oxygen and nitrogen from the total pressure: Partial pressure of hydrogen = Total pressure - Partial pressure of oxygen - Partial pressure of nitrogen, Partial pressure of hydrogen = 74 kPa - 21 kPa - 45 kPa = 8 kPa.