Which of the following best describes the relationship between the mole and concentration in a solution?

• A. Concentration is the mass of solute divided by the number of moles.
• B. Concentration is defined as the number of moles of solute per liter of solution.
• C. Concentration is the volume of solute divided by the number of moles.
• D. Concentration is the number of molecules present in one mole of a substance.

Answer: (B)

Verified step by step guidance

1. Understand the definition of concentration in the context of solutions. Concentration typically refers to how much solute is present in a given volume of solution.
2. Recall that the most common unit of concentration in chemistry is molarity, which is defined as the number of moles of solute per liter of solution.
3. Recognize that mass divided by moles does not define concentration; rather, mass and moles are related by molar mass, but concentration involves volume.
4. Note that volume of solute divided by moles is not a standard way to express concentration, since concentration relates moles to total solution volume, not just solute volume.
5. Understand that the number of molecules in one mole (Avogadro's number) is a constant and does not describe concentration, which depends on how much solute is dissolved in a certain volume.