code: def molar_mass(compound=''):
      
  
      result = 0.0
      if compound is None or len(compound) == 0:
          return result
  
      compound = compound.strip()
  
      parsed = parse_compound(compound)
  
      return parsed.molar_mass()
docs: Determine the molar mass of a chemical compound.
  
      The molar mass is usually the mass of one mole of the substance, but here
      it is the mass of 1000 moles, since the mass unit used in auxi is kg.
  
      :param compound: Formula of a chemical compound, e.g. 'Fe2O3'.
  
      :returns: Molar mass. [kg/kmol]