docs: def get_el_amount(self, element):
          """
          Returns the amount of the element in the reaction.
  
          Args:
              element (Element/Specie): Element in the reaction
  
          Returns:
              Amount of that element in the reaction.
          """
          return sum([self._all_comp[i][element] * abs(self._coeffs[i])
                      for i in range(len(self._all_comp))]) / 2