Which term is used to describe the measure of the efficiency of a chemical reaction?

• A. Percent yield
• B. Molarity
• C. Limiting reactant
• D. Empirical formula

Answer: (A)

Verified step by step guidance

1. Understand that the question asks for the term that describes how efficient a chemical reaction is, meaning how much product is actually obtained compared to the maximum possible amount.
2. Recall that 'Molarity' refers to the concentration of a solution, expressed as moles of solute per liter of solution, and does not measure reaction efficiency.
3. Recognize that 'Limiting reactant' is the reactant that is completely consumed first in a reaction, determining the maximum amount of product formed, but it is not a measure of efficiency itself.
4. Know that 'Empirical formula' represents the simplest whole-number ratio of elements in a compound, unrelated to reaction efficiency.
5. Identify that 'Percent yield' is the term used to quantify the efficiency of a chemical reaction by comparing the actual yield (amount of product obtained) to the theoretical yield (maximum possible amount), usually expressed as a percentage.