We must ensure the same number of each type of atom appears on both sides of the arrow
Notice the distribution: 3 carbons on both sides, 8 hydrogens on both sides, 10 oxygens on both sides.
Using Moles to Predict Reaction Outcomes
Imagine you measure 2 moles of C3H8 How many O2 Moles are needed to equalize
The ratio between C3H8 And O2 Mole
Convert the given mass to moles.
Use the mole ratio (from the balanced equation) to find the moles of desired product.
Convert these moles back to mass using molar mass.
Combustion Reaction: C₃H₈ + O₂ → CO₂ + H₂O Balance the equation for the combustion of propane.
Single Replacement Reaction: Zn + HCl → ZnCl₂ + H₂ Balance the equation for zinc reacting with hydrochloric acid.
Double Replacement Reaction: BaCl₂ + Na₂SO₄ → BaSO₄ + NaCl Balance the equation for barium chloride reacting with sodium sulfate.
Decomposition Reaction: KClO₃ → KCl + O₂ Balance the equation for the decomposition of potassium chlorate.
Neutralization Reaction: H₂SO₄ + NaOH → Na₂SO₄ + H₂O Balance the equation for sulfuric acid reacting with sodium hydroxide.