Statement 1 : As mole is the basic chemical unit, the concentration of the dissolved solute is usually specified in terms of number of moles of solute.Statement 2 : The total number of molecules of reactants involved in a balanced chemical equation is known as molecularity of the reaction.

The number of moles of a solute present in one litre of solution is known is as molarity (M).The total number of molecules of reactants present in a balanced chemical equation is known as molecularity. For example,PCl5 →  PCl3 +  Cl2 Unimolecular2HCl → H2+I2 Bimolecular∴ Molarity and molecularity are used in different sense.