Answer:
3 P₄ + 10 KClO₃ -----> 10 KCl + 6 P₂O₅
Step-by-step explanation:
Remember, the reactants are the species taking part in the reaction (left side) and the products are the species being created (right side). An equation is balanced when there is an equal amount of each element on both sides of a reaction. If the amounts are unequal, you can modify them by adding coefficients to change the quantity of particular compounds/molecules.
Unbalanced Equation:
P₄ + KClO₃ -----> KCl + P₂O₅
Reactants: 4 phosphorus, 1 potassium, 1 chlorine, 3 oxygen
Products: 2 phosphorus, 1 potassium, 1 chlorine, 5 oxygen
Balanced Equation:
3 P₄ + 10 KClO₃ -----> 10 KCl + 6 P₂O₅
Reactants: 12 phosphorus, 10 potassium, 10 chlorine, 30 oxygen
Products: 12 phosphorus, 10 potassium, 10 chlorine, 30 oxygen