Chemistry Regents Practice Test 2025 – Complete Prep Resource

Molarity is defined as the number of moles of solute per liter of solution. This definition establishes molarity as a precise way to express the concentration of a solute in a given volume of solvent, which is crucial for understanding chemical reactions and solution preparation in chemistry.

In a formula, molarity (M) is calculated using the equation:

\[ M = \frac{\text{moles of solute}}{\text{liters of solution}} \]

This means that if you have a certain number of moles of a chemical, you can determine its molarity by dividing that number by the total volume of the solution in liters. This concept is foundational for stoichiometry, dilution calculations, and understanding how substances interact in solution.

The other definitions do not accurately capture the concept of molarity. While they may relate to various measures of concentration or solution specifics, only the definition relating to moles of solute per liter directly defines the molarity and allows for calculations involving reaction kinetics and concentrations in chemical processes.