Which of the following best describes the molarity (M) of a solution?

• A. The number of moles of solute per liter of solution
• B. The number of moles of solute per kilogram of solvent
• C. The number of grams of solute per liter of solution
• D. The number of moles of solvent per liter of solution

Answer: (A)

Verified step by step guidance

1. Understand that molarity (M) is a way to express the concentration of a solution in terms of the amount of solute dissolved in a given volume of solution.
2. Recall the definition of molarity: it is the number of moles of solute divided by the volume of the entire solution in liters.
3. Note that molarity is not based on the mass of the solvent or solute, but rather on the moles of solute and the total volume of the solution.
4. Compare the given options to the definition: the correct description should mention moles of solute and liters of solution.
5. Conclude that the best description of molarity is 'The number of moles of solute per liter of solution.'