Question

A solution is made by dissolving 25.7 g of copper(II) chloride, CuCl₂, in enough water to make exactly 100 mL of solution. Calculate the concentration (molarity) of CuCl₂ in mol/L (M).

M CuCl₂

Answer 1

Answer:

Given mass of CuCl2=25.7 g

Molar mass of CuCl2=134.45 g/mol

Moles of CuCl2=mass/molar mass=25.7g/134.45 g/mol=0.1911 mol.

Volume of water=100 mL=0.1 L (since 1L=1000 mL)

Molarity=moles/volume=0.1911 mol/0.1 L=1.911 mol/L=1.911 M.

Therefore the molarity of CuCl2=1.911 M.

Please let me know if you have any doubt. Thanks.