The molarity of a solution is defined as the number of moles of solute dissolved in

Explanation

Molarity refers to the total volume of the final solution, not to the volume of solvent used, which is why a standard solution is made up to the mark in a volumetric flask rather than by adding a measured volume of water. Moles per 1000 g of solvent defines molality instead, a quantity that does not change with temperature. The distinction matters whenever a solution is heated.