AP Chemistry
1.4 Composition of Mixtures
1.1 Moles and Molar Mass
A gas cylinder contains a mixture of only helium gas, \(\text{He}\) (\(\text{molar mass } 4.0\text{ g/mol}\)), and argon gas, \(\text{Ar}\) (\(\text{molar mass } 40.0\text{ g/mol}\)). A \(2.00\text{ mol}\) sample of this mixture has a total mass of \(26.0\text{ g}\). What is the mole fraction of \(\text{He}\) in the mixture?
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