Question
Asked May 5, 2019

A solution of NaCl in water has a concentration of 20.5% by mass. What is the molal concentration of the solution?

MM of NaCl = 58.44 g/mol

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Step 1

Molal concentration of the solution is to be calculated when the solution has 20.5 % by mass of NaCl. It implies that the solute is NaCl and the solvent is water in the solution.

Step 2

Let us assume that we have 100 g of solution which consists of 20.5 % by mass of NaCl. Therefore,

 

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Step 3

Now , molality of solution is defined as the moles of solute(n) per Kilogram of solvent.

Thus, to determine the molal concentration of the given...

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