# What is the concentration of a mass of 90*g of common salt dissolved in a 5.0*L of solution?

We take the quotient, $\text{moles of solute"/"volume of solution"="concentration}$
$\frac{\frac{90 \cdot g}{58.44 \cdot g \cdot m o {l}^{-} 1}}{5.0 \cdot L} \cong 0.30 \cdot m o l \cdot {L}^{-} 1$
What are $\left[N {a}^{+}\right]$ and $\left[C {l}^{-}\right]$?