A known mass of organic compound in burnt in presence of excess of CuO. ‘C’ and ‘H’ of the compound oxidize to CO2 and H2O, respectively. These vapours are passed through weighed ‘U’ tubes having anhydrous CaCl2 followed by KOH solution. CaCl2 absorbs H2O while KOH absorbs CO2 . Increase in the mass of CaCl2 and KOH gives he amount of H2O and CO2 produced in combustion which inturn gives the % of H and C present in the compound.
