A 10.0 L flask at 318 K contains a mixture of Ar and CH₄ with a total pressure of 1.040 atm.If the mole fraction of Ar is 0.715,what is the mass percent of Ar? A) 13.8% B) 68.8% C) 71.5% D) 82.9% E) 86.2%

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Quizplus · Accepted Answer

The mole fraction of Ar is 0.715, which means 71.5% of the moles are Ar. Since the molar mass of Ar is greater than that of CH₄, the mass percent of Ar will be higher than the mole percent, resulting in 86.2%.

A 100 L Flask at 318 K Contains a Mixture of of Ar