Which term refers to the number of moles of solute per liter of solution?

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

Answer: (A)

Verified step by step guidance

1. Understand that the problem is asking for the term that defines the concentration of a solution in terms of moles of solute per liter of solution.
2. Recall the definitions of the given terms: Molarity is 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. Normality refers to the number of equivalents of solute per liter of solution, which depends on the reaction involved and is not simply moles per liter.
4. Mass percent is the mass of solute divided by the total mass of the solution, multiplied by 100%, and does not involve volume or moles directly.
5. Molality is the number of moles of solute per kilogram of solvent, not per liter of solution, so it differs from molarity.