What term describes mole of solute per liter of solution?

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

Answer: (C)

Molarity describes mole of solute per liter of solution. It is defined as M = n/V, where n is the amount of solute in moles and V is the volume of the solution in liters. This means that if you dissolve a certain number of moles in a liter, you have a 1 M solution; if you add more solvent and increase the volume, the molarity decreases. Molality, on the other hand, uses kilograms of solvent, so it doesn’t change with volume changes from dilution. Mass percent is a mass-based concentration, expressing the mass of solute relative to the total mass of solution, not involving volume. Normality refers to equivalents per liter and depends on the chemical reactivity (valence) of the solute, not just the amount of solute.