A teaspoon holding about 0.01 mol of sucrose is stirred into 200 mL of tea. What is the molarity of sucrose?

1. Molarity is moles of solute per litre of solution. 2. Convert 200 mL to litres: 200 mL / 1000 = 0.200 L. 3. Divide: 0.01 mol / 0.200 L = 0.05 M. 4. The value 0.005 M would follow from dividing by 2 L instead of 0.2 L, a factor of ten slip. 5. A sanity check helps: one fifth of a litre holds 0.01 mol, so a full litre would hold five times as much. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.3 Molarity_