Problem: An aqueous solution contains 4.6 % NaCl by mass. Calculate the molality of the solution.

FREE Expert Solution

We’re being asked to calculate the molality of an aqueous solution that contains 4.6% NaCl by mass.


When calculating for molality, we use the following equation:

molality (m)=moles solutekg solvent

Aqueous solution → water is the solvent
                                   Solute → NaCl


We will calculate the molality of the solution using the following steps:

Step 1: Determine the composition of the solution.
Step 2: Calculate the moles of the solute.
Step 3: Calculate the mass of the solvent (in kg).
Step 4: Calculate the molality of the solution.


Step 1: Determine the composition of the solution.

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Problem Details
An aqueous solution contains 4.6 % NaCl by mass. Calculate the molality of the solution.

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