Question

$4.5g$ of a solute having molar mass of $90g/mol$ is dissolved in water to make a $250mL$ solution. Calculate the molarity of the solution.

Answer 1

Calculate the molarity of solution:

Number of moles of solute, $\mathrm{n}=\frac{4.5}{90}=0.05$

Molarity of solution, $\mathrm{M}=\frac{0.05}{\left({\displaystyle \frac{250}{1000}}\right)}=0.2\mathrm{M}$

Thus, the molarity of the solution is $0.2\mathrm{M}$.