Question

What is the concentration of copper sulphate (in mol $L^{-1}$) if $80g$ of it is dissolved in enough water to make a final volume of $3L$?

• A. $0.0167$
• B. $0.167$
• C. $1.067$
• D. $10.67$

Answer 1

The correct option is B $0.167$

Molarity, M=number of moles/volume of solution

$M=\frac{n}{V}$

Number of moles, n=mass/molar mass

Molar mass of $CuS{O}_4$=159.5 g/mole

mass=80g

$n=\frac{80}{159.5}=0.5$ mole

$\therefore M=\frac{0.5}{3}=0.167mole/L$