If a mixture of gases has a total pressure of 200 mm Hg and it is 80% nitrogen and 20% oxygen,then according to Dalton's law of partial pressures,the pressure due to oxygen is _____ mm Hg.
A) 20
B) 80
C) 160
D) 40
E) 200

Question

Quizplus · Accepted Answer

According to Dalton's law of partial pressures, the total pressure of a mixture of gases is equal to the sum of the partial pressures of each gas. In this case, the total pressure is 200 mm Hg and the mixture is 80% nitrogen and 20% oxygen.

To find the partial pressure due to oxygen, we first need to calculate the total pressure due to nitrogen and oxygen:
Partial pressure due to nitrogen = 80% x 200 mm Hg = 160 mm Hg
Partial pressure due to oxygen = 20% x 200 mm Hg = 40 mm Hg

Therefore, the pressure due to oxygen is 40 mm Hg. So, the answer is D.

If a Mixture of Gases Has a Total Pressure of 200