Which term describes the concentration of a solution as the number of moles of solute per liter of solution?

• A. Normality
• B. Mass percent
• C. Molarity
• D. Molality

Answer: (C)

Verified step by step guidance

1. Understand that concentration terms describe how much solute is present in a given amount of solvent or solution.
2. Recall that molarity (M) is defined as the number of moles of solute divided by the volume of the solution in liters, expressed as \(M = \frac{\text{moles of solute}}{\text{liters of solution}}\).
3. Recognize that normality relates to equivalents per liter, mass percent is the mass of solute divided by total mass times 100%, and molality is moles of solute per kilogram of solvent, not per liter of solution.
4. Identify that since the problem asks for moles of solute per liter of solution, the correct term is molarity.
5. Summarize that molarity is the concentration term that directly relates moles of solute to the volume of the entire solution in liters.