Discussion
The number of moles of solute present in 1 kg of a solvent is called its
Answer: A
This is the molality of the solution.
\[m=\frac{\text{moles of solute}}{\text{mass of solvent in kg}}\] Because it is defined by mass rather than volume, molality does not change with temperature - which is why the colligative-property formulae use it. Molarity is moles per litre of solution and does vary with temperature.
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