Unit 5b: Stoichiometry!

WARNING!! You must master mol conversions from unit 5a before moving onto unit 5b

Stoichiometry:

The word stoichiometry derives from two Greek words: stoicheion (meaning "element") and metron (meaning "measure"). Stoichiometry deals with calculations about the masses (sometimes volumes) of reactants and products involved in a chemical reaction.

Steps for solving

Step 1: Balance the chemical equation.

Step 2: Find the limiting reactant

Step 3: Use mols of limiting reactant to convert to unknown using the mol to mol ratio (coefficients in the balanced chemical equation), then converto to what you need using mol conversions

Mol to Mol Ratio

Finding the Limiting Reactant

Step 1: Convert givens to mols (if not already given in mols)

Step 2: Divide mols by their coefficient to get USES! The smallest uses is the limiting reactant. Circle limiting in your chemical equation. You will use the mols of this reactant for all other calculations!!!

Limiting Reactant Video

Limiting Reactant Quiz Practice Video

Mol to Mol Ratios

In-Class Practice

Any time you are trying to switch from one component of a chemical equation to another, you must use a mol to mol ratio. The mol to mol ratio is given by the coefficients in the balanced chemical equation.