# A 0.9% (w/w) aqueous NaCl solution has a density of 1.0 g/mL. What is the molality of this solution?

## Question:

A 0.9% (w/w) aqueous NaCl solution has a density of 1.0 g/mL. What is the molality of this solution?

## Molality:

Molality is the molal concentration. It is defined as the number of moles of solute dissolved in 1 kilogram of the solvent. It is denoted by "m". Molality is not affected by the temperature.

## Answer and Explanation: 1

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Mass of NaCl solution = 0.9% (w/w)

% w/w means weight/weight. It indicates that 0.9 g NaCl is dissolved in 100 g of water.

Mass of solvent...

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Chapter 8 / Lesson 4What is molarity? What is molality? Compare molarity vs molality by viewing molality and molarity formulas, how to calculate molarity and molality, and examples.

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