Final answer:
Option B: The best way to determine the concentration of a liquid solute dissolved in a liquid solvent is by using Molarity. Molarity is a measure of the number of moles of solute per liter of solution.
Step-by-step explanation:
The best way to determine the concentration of a liquid solute dissolved in a liquid solvent is by using Molarity (option A). Molarity is a measure of the number of moles of solute per liter of solution. It is commonly used because it allows for precise and accurate calculations, especially when dealing with reactions and stoichiometry.
For example, if you have a solution with a known molarity, you can calculate the volume of solution needed to obtain a specific amount of solute or vice versa.
The other options mentioned, Mass/Mass Percent (option B), Volume/Volume Percent (option C), and Molality (option D), are also valid concentration units, but they are not as commonly used or as versatile as molarity.