Chemistry - Stoichiometry - Mass-to-mass calculations - The Complete Stoichiometry Method

A step-by-step worked example of mass-to-mass calculation for Grade 11. Problem: 'How many grams of water are produced when 8g of hydrogen reacts with excess oxygen? 2H₂ + O₂ → 2H₂O.' Step 1: Convert given mass to moles. 8g H₂ ÷ 2 g/mol = 4 mol H₂. Step 2: Use mole ratio to find moles of desired. 4