In which of the following containers is the mole fraction of helium greatest? The white circles represent helium atoms; the dark circles represent argon atoms.

Question

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Container C has the greatest mole fraction of helium because it has the most helium atoms relative to the total number of atoms in the container. Container A has the least mole fraction of helium because it has the fewest helium atoms relative to the total number of atoms in the container. Containers B and D have intermediate mole fractions of helium.

In Which of the Following Containers Is the Mole Fraction