The molarity of a solution is defined as the number of moles dissolved in one litre of solution. A change in temperature causes a change in volume, hence changes the molarity of a solution. On the other hand, the mass of a solution does not change with a change in temperature. Hence, terms such as mass percentage, ppm, mole fraction, and molality are independent of temperature as they are calculated on the basis of mass and do not involve volume.
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