Discussion
Consider the following statements about composition units.
1. Mole fraction and mass fraction are generally different numbers.
2. Parts per million by mass and by volume differ for a gas mixture.
3. Mole percent and volume percent differ for an ideal gas.
Answer: B
The first two are correct. The third is false for an ideal gas, where equal volumes contain equal numbers of moles, so the two percentages coincide. That equality does not hold for liquids. Liquid volumes are not additive on mixing either.
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