Question

Find the molarity of 0.5g of sodium chloride is dissolved to make 0.05 liters of solution.

Answer 1

Molarity=$\frac{Number of moles of solute}{Volume of solution (L)}$

Volume of solution=0.05 L
Number of moles ,we need to find.
No of moles=$\frac{Mass}{Molar Mass}$
mass=0.5g
molar mass of NaCl=58.5

No of moles=$\frac{Mass}{Molar Mass}$
                   =0.5/58.5
                   =0.0085

NOW TO FIND MOLARITY,

Molarity=$\frac{Number of moles of solute}{Volume of solution (L)}$
            =0.0085/0.05
            =0.17M