Which of the given quantity must be measured in order to calculate the molality of a solution?
I. Mass of the solute
II. Mass of the solvent
III. Total volume of the solution

I only

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I and III only

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II and III only

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I and II only

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I, II, and III

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Solution

The correct option is E I and II only
The quantities I and II only must be measured in order to calculate the molality of a solution.
I. Mass of the solute from which we can calculate the number of moles of solute by using molar mass.
II. Mass of the solvent.
Molality is the ratio of the the number of moles of solute to the mass of solvent (in kg). The number of moles of solute is the ratio of mass of solute to its molar mass.

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