code: @Override
      public boolean setReactantCoefficients(Double[] coefficients) {
          boolean result = reactants.setMultipliers(coefficients);
          notifyChanged();
          return result;
      }
docs: Sets the coefficients of the reactants.
  
  @param   coefficients An array of double's containing the coefficients of the reactants
  @return  true if coefficients have been set.
  @see     #getReactantCoefficients