What is the molarity of 6.52 g of CoCl2, molar mass 128.9 g/mol, dissolved to a total volume of 75.0 mL?

1. Convert the mass of solute to an amount: 6.52 g / 128.9 g/mol. 2. That gives 0.05058 mol of CoCl2. 3. Convert the volume: 75.0 mL / 1000 = 0.0750 L. 4. Divide the amount by the volume: 0.05058 mol / 0.0750 L. 5. The concentration is 0.674 M. 6. The value 0.0506 M reports the mole count without dividing by the volume at all. 7. The value 0.0674 M leaves the volume in millilitres, shifting the answer by a factor of ten. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_