Question

At T (K), a gaseous mixture containing H₂, He and O$_$2 exerted a pressure of 1 bar. The weight percentage of H$_$2 and He is 20 and 16 respectively. The partial pressure (in bar) of H$_$2, He and O$_$2 is respectively

• A. 0.625, 0.250, 0.125
• B. 0.625, 0.125, 0.250
• C. 0.250, 0.125, 0.625
• D. 0.125, 0.250, 0.625

Hint:

For gaseous mixtures, use Dalton's Law of Partial Pressures and the mole fraction of each component to calculate the individual partial pressures.

Answer 1

The Correct Option is A

The total pressure exerted is 1 bar. The partial pressure of a component in a mixture is proportional to its mole fraction. Given the weight percentages of H$_$ and He, we can calculate the mole fractions, and hence, the partial pressures of each gas. This gives us 0.625 bar for H$_$, 0.250 bar for He, and 0.125 bar for O$_$.