code: private ValueUnitWrapper normalizeSpecialCases(double value, String unit)
              throws UnknownUnitException {
          if (unit.equals("mol/dm3")) {
              return new ValueUnitWrapper(value, MOLAR_NORMALIZED_UNIT);
          } else {
              throw new UnknownUnitException(unit);
          }
      }
docs: deals with the normalization of special cases