The ratio of the mass percentages of 'C & H' and 'C & 0' of a saturated acyclic organic compound 'X' are 4 : 1 and 3 : 4 respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound 'X' is ______

C :              H               : OMass ratio               4 :              1               : 163Mole ratio            412:            1              :16316=                                 13:             1              :13=                                  1  :              3              : 1∴ empirical formula  =CH3O∴  molecular formula possibility =C2H6O2 (diol)C2H6O2+52O2→2CO2+3H2O∴2 moles of organic compound requires 5 moles of O2