Scenarios/Reactions Mass of the Reactants Mass of the Products 1. Rusting of iron 4Fe + 3O2 + 2H2O → 2Fe2O3 .

2. Fermentation of sucrose using yeasts in which the sugar reacts to produce ethyl alcohol and carbon dioxide C12H22O11 + H2O → 4C2H5OH + 4CO2

3. Combustion of propane gas with oxygen produces carbon dioxide and water. C3H8 + 5O2 → 4H2O + 3CO2

4. During photosynthesis, plants convert carbon dioxide and water into glucose and oxygen. 6CO2 + 6H2O → C6H12O6 (aq) + 6O2 (g)

5. Vinegar is used in removing iron oxide in metallic artifacts which produces Iron (II) acetate and water. 2CH3COOH + FeO → (CH3COO)2Fe + H2O​