Question

How many moles of sodium chloride are present in 250mL of a 0.50 M NaCI solution?

• A. $0.125mol$
• B. $0.150mol$
• C. $0.075mol$
• D. $0.02mol$

Answer 1

The correct option is A 0.125 mol

given data :

Volume =250 ml

Molarity =0.50 M

$\mathrm{Molarity}=\frac{\mathrm{No}\mathrm{of}\mathrm{Moles}}{\mathrm{Volume}}$

$\mathrm{No}.\mathrm{of}\mathrm{Moles}=\mathrm{Molarity}\times \mathrm{Volume}\left(\mathrm{L}\right)$

$$\begin{gathered} =0.5\times 0.25 \\ =0.125\mathrm{mol} \end{gathered}$$