How many moles of glycine are in 28.35 g of glycine, whose molar mass is 75.07 g/mol?

1. Amount in moles equals mass divided by molar mass. 2. Substituting gives 28.35 g / 75.07 g/mol. 3. The division yields 0.378 mol of glycine. 4. As a check, 28.35 g is a bit more than a third of 75.07 g, so the answer should be a little above 0.33 mol. 5. The value 2.65 mol comes from dividing the molar mass by the mass, which turns the ratio upside down. _Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.1 Formula Mass and the Mole Concept_