Which concept is used to determine the quantities of products from given reactants?

• A. Stoichiometry
• B. STP
• C. Arrhenius acid
• D. Boyle's Law

Answer: (A)

Stoichiometry is the method that connects how much of the reactants you start with to how much product you can form. It uses a balanced chemical equation and mole ratios to conserve atoms and mass. By turning the given reactant amounts into moles and applying the coefficients from the balanced equation, you can calculate how many moles of each product are produced, and then convert to the desired units (grams, liters, etc.). This approach also lets you determine the theoretical yield and, if needed, identify the limiting reactant.

The other concepts aren’t about linking reactant quantities to product amounts. STP concerns the volume of gases at standard temperature and pressure; Arrhenius acid describes how acids dissociate in solution; Boyle’s Law relates pressure and volume of a gas at fixed temperature.