A chemical engineer places a mixture of noble gases consisting of 10.0 grams of helium and 20.0 grams of Neon in a piston cylinder assembly. What is the mole fraction of Neon in this mixture?

Question

Quizplus · Accepted Answer

The mole fraction of Neon is calculated by dividing the moles of Neon by the total moles of the mixture. The molar mass of Helium is approximately 4 g/mol, and for Neon, it is approximately 20 g/mol. Thus, there are 10.0 g / 4 g/mol = 2.5 moles of Helium and 20.0 g / 20 g/mol = 1.0 mole of Neon. The total moles in the mixture = 2.5 moles (He) + 1.0 mole (Ne) = 3.5 moles. The mole fraction of Neon = moles of Neon / total moles = 1.0 / 3.5 = 0.286. The closest answer provided is 0.284.

A Chemical Engineer Places a Mixture of Noble Gases Consisting