Limiting reactants (HT only)
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Mole ratios and the big idea

Mole ratios and the big idea

Particle diagram showing 3 magnesium atoms reacting with 8 hydrochloric acid molecules; 3 MgCl2 units and 3 H2 molecules form, with 2 HCl molecules left over to show an excess reactant A balanced equation is a mole recipe. In Mg+2HCl→MgCl2+H2\text{Mg} + 2\text{HCl} \to \text{MgCl}_2 + \text{H}_2Mg+2HCl→MgCl2​+H2​, the coefficients show a mole ratio of 1:2:1:11:2:1:11:2:1:1, so 1 mol1 \, \text{mol}1mol of magnesium needs 2 mol2 \, \text{mol}2mol of hydrochloric acid.

Limiting reactants (HT only) Lesson

  1. GCSE
  2. /Chemistry
  3. /Limiting reactants (HT only)