The mole ratio is the ratio between the amount of moles in the compounds of a reaction. The mole ratio can be used as a conversion factor between reactants nd products, and can be worked out by looking at the coefficients in front of

A solution formed when a solute dissolves in a solvent has a concentration which can be calculted by dividing the mass of dissolved dolute in g by the volume of the solution in dm³ giving the concentration in g/dm³.

You can calculate the concentration in mol/dm³ of a solution by calculating the moles and dividing by the volume of the solution.