Chemistry / Unit 3 Chem 0471 short lesson, about 20 seconds
Mole Ratios from a Balanced Equation
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The idea
A balanced equation's coefficients give the exact mole ratio in which reactants combine and products form.
In practice
In 2H2 + O2 → 2H2O, every 2 mol of hydrogen reacting consumes 1 mol of oxygen and produces 2 mol of water.
Where people slip
Mole ratios come only from a correctly balanced equation — an unbalanced equation's coefficients give a ratio that misrepresents the actual reaction.
Your place on the trail
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