Answer
The concentration of $LiCl$ in that $LiCl$ solution is equal to 6.25 % (m/v).
Work Step by Step
1. Write the concentration expression:
$Concentration \space (m/v) = \frac{mass \space of \space solute \space (g)}{volume \space of \space solution \space (mL)} \times 100 \%$
2. Substitute the values, and calculate the concentration:
$Concentration \space (m/v) = \frac{2.50 \space g }{40.0 \space mL} \times 100 \% = 6.25\% \space (m/v)$
