MDCAT Stoichiometry 2026 — Moles, Limiting Reagents, % Yield

Core Concepts

• Mole = N_A = 6.022 × 10²³ particles
• Moles = mass / molar mass
• Molarity = moles solute / litres solution
• Gas STP — 1 mole = 22.4 L

Limiting Reagent

Calculate moles of each reactant divided by its stoichiometric coefficient; smallest ratio = limiting reagent.

% Yield

% yield = (actual / theoretical) × 100. Theoretical is calculated from the limiting reagent.

Drill Chemistry past papers.