Discussion
All of the following are ways of expressing composition EXCEPT
Answer: D
Correct answer: the specific gravity of the solution
Specific gravity is a bulk physical property - a ratio of densities - and says nothing directly about what the solution contains; two quite different mixtures may share one. Mole fraction, mass fraction and molality all state how much of a species is present relative to a defined quantity, which is what a composition unit does. Specific gravity is used to *infer* composition only through a calibration for one particular system.
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