Why is it necessary to use a balanced chemical equation when performing stoichiometry calculations?

• A. Because it allows you to ignore the conservation of mass.
• B. Because it shows which reactant is always in excess.
• C. Because it makes calculations faster, regardless of the actual reaction.
• D. Because it ensures the correct mole ratios of reactants and products are used.

Answer: (D)

Verified step by step guidance

1. Understand that stoichiometry is the quantitative relationship between reactants and products in a chemical reaction.
2. Recognize that a balanced chemical equation has equal numbers of each type of atom on both sides, reflecting the Law of Conservation of Mass.
3. Know that the coefficients in a balanced equation represent the mole ratios of reactants and products involved in the reaction.
4. Use these mole ratios to convert between amounts of reactants and products accurately during stoichiometric calculations.
5. Therefore, a balanced chemical equation is necessary because it ensures the correct mole ratios are used, which is essential for precise and meaningful stoichiometric calculations.