Mole Ratios from a Balanced Equation
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A balanced equation's coefficients give the exact mole ratio in which reactants combine and products form.
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In 2H2 + O2 → 2H2O, every 2 mol of hydrogen reacting consumes 1 mol of oxygen and produces 2 mol of water.
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Mole ratios come only from a correctly balanced equation — an unbalanced equation's coefficients give a ratio that misrepresents the actual reaction.