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AP Chemistry · Topic 1.1: Moles and Molar MassOpen topic

Original PrepAtlas question. This is not an official College Board question.

A student obtains a 0.500 mol sample of He(g) and a 0.500 mol sample of CO₂(g). Which statement correctly compares the two samples?

ABoth samples contain the same total number of atoms.BBoth samples contain the same number of representative particles, but their masses differ.CThe CO₂ sample contains three times as many molecules as the helium sample contains atoms.DBoth samples have the same mass because their mole amounts are equal.

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