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Question

Which of the following will not change with change in temperature and why?
1.Molality
2.Normality
3.Volume%
4.M/V%

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Solution

Dear Student,

1. Molality = Mass of soluteMolar mass of solute×1000Mass of solvent2. Molarity =Mass of soluteEquivalent mass of solute×1000Volume of solution3. Volume %=Volume of soluteVolume of solution×1004. M/V%=Mass of soluteVolume of solution×100Except molality, all other three formula contains the term volume. Volume is related to temperature, as it increases or decreases with change in temperature. Molality is calculated in terms of mass only which is not affected by change in temperature.Hence, the answer is (1) i.e. Molality doesnot change with change in temperature.

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