Question

_________ is measured in moles per litre.
(A) Molality
(B) Molar concentration
(C) Number of moles
(D) None of these

Answer 1

Hint: When we talk about the concentration of a solution then it refers to the amount of solute dissolved in a given amount of the solvent. . Hence the molarity and the molar concentration are the same so the correct option for the above question is option B.

Complete step by step answer
When we talk about the concentration of a solution then it refers to the amount of solute dissolved in a given amount of the solvent. Further we can say here that the concentration can be measured in moles per litre. Hence, we can say here that the molarity is used to define the concentration in moles per litre. Talking further we can say that molality is the amount of substance dissolved in a certain mass of the solvent. It is further expressed as the solute per kilograms of a solvent. Moreover the number of moles are the ones which are given as the Avogadro number . hence, we can conclude here that the molarity is measured in terms of moles per litre. In the international system the molarity is the moles per meter cube. Hence here we can say that the molarity and the molar concentration are the same.
The correct option for the above question is option B.

Note
It is important to note here that the use of molar concentration is often not convenient because the volume of most of the solution slightly depends on the concentration due to the expansion property of the molecules.