How many grams of CaCl2, molar mass 110.98 g/mol, are in 250.0 mL of a 0.200 M solution?

1. Convert the volume: 250.0 mL / 1000 = 0.2500 L. 2. Find the amount of solute: 0.200 mol/L x 0.2500 L = 0.0500 mol. 3. Convert that amount to a mass: 0.0500 mol x 110.98 g/mol. 4. The product is 5.55 g of CaCl2. 5. Units cancel throughout, from mol/L times L to mol, then mol times g/mol to grams. 6. The value 0.0500 g reports the mole count with a gram label attached, skipping the molar mass step. 7. The value 55.5 g leaves the volume in millilitres before multiplying. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_