# If the {eq}\% \, \mathrm{m/m} {/eq} of a solution of {eq}\mathrm{NaCl} {/eq} is {eq}22 \% {/eq}, how many grams of {eq}\mathrm{NaCl} {/eq} are present in {eq}250 \, \mathrm{g} {/eq} of solution?

## Question:

If the {eq}\% \, \mathrm{m/m} {/eq} of a solution of {eq}\mathrm{NaCl} {/eq} is {eq}22 \% {/eq}, how many grams of {eq}\mathrm{NaCl} {/eq} are present in {eq}250 \, \mathrm{g} {/eq} of solution?

## Percentage Composition Of Solutions

Perhaps the most common unit used in chemistry for concentration of a solution is the molarity, defined as the number of moles of solute per liter of solution. However, in some scenarios, we may be given the concentration of the solution as percentage by mass. This is defined as:

{eq}\displaystyle \% \ (m/m) =\frac{mass \ of \ solute}{mass \ of \ solution} \times 100 \% {/eq}

## Answer and Explanation: 1

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We are told that the total mass of the sodium chloride solution is 250 g. The concentration of this solution is also given to us as 22% (m/m).

Now,...

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