A gas mixture of He and Ar has a total pressure of 4.10 atm.What is the mole fraction of Ar if the partial pressure of Ar is 1.50 atm?
A)0.634
B)2.6
C)36.6
D)0.366
E)63.4

Question

Quizplus · Accepted Answer

The mole fraction of a component in a gas mixture is defined as the ratio of the number of moles of that component to the total number of moles in the mixture.

Let x be the mole fraction of Ar. Then, the mole fraction of He is (1-x).

We can use the formula for partial pressure:

partial pressure = mole fraction x total pressure

For Ar, we know that:

1.5 atm = x(4.10 atm)

Solving for x, we get:

x = 1.5 atm / 4.10 atm = 0.366

Therefore, the mole fraction of Ar is 0.366 or 36.6%.

The correct answer is D.

A Gas Mixture of He and Ar Has a Total