Chemical Concentration (M, %, N, m)

Molarity (M) = mole of solute / volume of solvent = mol/L

Percent concentration (%) = mass of solute / mass of solvent *100 = %
(density of solution should be considered converting between M and %.)

Normality (N) = molarity * equivance = mol/L
e.g., 1M H2SO4 = 1N SO42- = 2N H+

Molality (m) = mole of solute / mass of solvent = mol/kg