<P> The Dumas method of molecular weight determination was historically a procedure used to determine the molecular weight of an unknown substance . The Dumas method is appropriate to determine the molecular weights of volatile organic substances that are liquids at room temperature . </P> <P> The method was designed by a French chemist named Jean Baptiste André Dumas, after whom the procedure is now named . Dumas used the method to determine the vapour densities of elements (mercury, phosphorus, sulfur) and inorganic compounds . </P> <P> Today, modern methods such as mass spectrometry and elemental analysis are used to determine the molecular weight of a substance . </P>

Describe the dumas method for determining the molar mass of a volatile liquid