In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

A) 0.179

B) 0.238

C) 0.357

D) 0.583

E) 0.417

In a gas mixture of He, Ne, and Ar with a total pressure of 8.40 atm, the mole fraction of is __________ if the partial pressures of He and Ne are 1.50 and 2.00 atm, respectively.

A) 0.179

B) 0.238

C) 0.357

D) 0.583

E) 0.417