What is the term for the concentration of a solute in a solution, expressed in moles per liter?

The concentration of a solute in a solution, expressed in moles per liter, is referred to as molarity. Molarity provides a measure of how concentrated a solution is, specifically indicating the number of moles of solute present in one liter of solution. This unit is widely used in chemistry because it directly relates to the volume of the solution, allowing for straightforward calculations in stoichiometry and reactions.

Molality, in contrast, is defined as the number of moles of solute per kilogram of solvent, which means it is based on the mass of the solvent rather than the volume of the solution. This can yield different concentration values if the temperature of the solution changes, as volume can expand or contract with temperature.

Normality is another measure of concentration that is specific to the reactive capacity of a solute in a solution, taking into account equivalents rather than just moles. This measure is particularly useful in acid-base chemistry and redox reactions.

Volume fraction, on the other hand, expresses concentration in terms of the ratio of the volume of solute to the total volume of solution, which is less directly related to the moles of solute present.

Thus, among the given terms, molarity is the most suitable answer for