Question

Calculate the molarity of 6.52 g of CoCl₂ (128.9 g/mol) dissolved in an aqueous solution with a total volume of 75.0 mL.

Short answer

Molarity of CoCl₂ = 0.673 M

Step-by-step solution

Given data

Mass of CoCl₂ = 6.52 g

Molecular weight of CoCl₂ = 128.9 g/mol

Volume = 75 mL = 0.075 L ( 1L = 1000 mL )

Moles of CoCl₂ = Mass/ Molecular weight = 6.52 g/ 128.9 g/mol = 0.0505 mol

Determine the molarity

Molarity = Moles of solute / Liters of solution

= 0.0505 mol / 0.075 L

= 0.673 M