Question

How many grams of sodium chloride are contained in 250.0 g of a 15% NaCl solution?

Answer 1

Given concentration of NaCl=15%

Means ,

In every 100g of Solution 15g of NaCl is present .

Now

• Given mass=250g

So ,

$\\ \Large\sf\longmapsto 250\times 15\%$

$\\ \Large\sf\longmapsto 250\times \dfrac{15}{100}$

$\\ \Large\sf\longmapsto 37.5g$

37.5g of NaCl present in 250g of solution.

Answer 2

Explanation:

Given concentration of NaCl=15%

Means ,

In every 100g of Solution 15g of NaCl is present .

Now

Given mass=250g

So ,

\begin{gathered}\\ \Large\sf\longmapsto 250\times 15\%\end{gathered}

⟼250×15%

\begin{gathered}\\ \Large\sf\longmapsto 250\times \dfrac{15}{100}\end{gathered}

⟼250×

100

15

\begin{gathered}\\ \Large\sf\longmapsto 37.5g\end{gathered}

⟼37.5g

37.5g of NaCl present in 250g of solution.