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21.

Why is the elivation in boiling point of water different in the following solution?
(i) 0.1 molar NaCl solution.
(ii) 0.1 molar sugar solution.

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22. Why does the molality of solution remains unchanged with rise in temperature?

Molality: Molality (m) is defined as the number of moles of the solute per kilogram (kg) of the solvent and is expressed as:

Molality (m) = $\frac{Moles of solute}{Mass of solvent in kg}$

molality are independent of temperature, whereas molarity is a function of temperature. This is because volume depends on temperature
and the mass does not.

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