#1: -NaBr+H_(3)PO_(4)arrow -Na_(3)PO_(4)+HBr #3: H_(2)O+ldots SO_(3)arrow ldots H_(2)SO_(4) #5: -Fe_(2)O_(3)+COarrow Fe+CO_(2)

1. The given chemical equation is a reaction between sodium bromide (NaBr) and phosphoric acid (H3PO4) to produce sodium phosphate (Na3PO4) and hydrogen bromide (HBr). To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. The balanced equation is: 3NaBr + H3PO4 → Na3PO4 + 3HBr.<br /><br />3. The given chemical equation is a reaction between water (H2O) and sulfur trioxide (SO3) to produce sulfuric acid (H2SO4). This equation is already balanced as written, with one molecule of water reacting with one molecule of sulfur trioxide to produce one molecule of sulfuric acid.<br /><br />5. The given chemical equation is a reaction between iron(III) oxide (Fe2O3) and carbon monoxide (CO) to produce iron (Fe) and carbon dioxide (CO2). To balance this equation, we need to ensure that the number of atoms of each element is the same on both sides of the equation. The balanced equation is: Fe2O3 + 3CO → 2Fe + 3CO2.