Chemistry

Using Grams Instead of Moles in Stoichiometry

Students use the coefficients in a balanced equation as gram ratios instead of mole ratios.

Quick check

Why students make it

The balanced equation shows numbers in front of formulas, so it feels like those numbers should compare the masses you measure on a scale. Coefficients count particles or moles, not grams.

The rule done right

In stoichiometry, use the balanced equation only after converting grams to moles. Follow grams →\to moles →\to mole ratio →\to grams if the answer needs a mass.

Related resources

stoichiometrymolesmolar-mass