3.2.2 Amounts of Substances in Equations

• The masses of reactants and products can be calculated from what?

  Balanced symbol equations.
• Chemical equations can also be interpreted in terms of what?

  Moles.
• Mg + 2HCl -> MgCl2 + H2 shows that…?

  One mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas.