Question

Kindly tell whether this point is a limitation of law of constant composition-- 1)if element combine in same ratio but the compound formed may be different for example -in the compounds C2H5OH and CH3OCH3(BOTH HAVE SAME MOLECULAR FORMULA C2H6O) the ratio of C:H:O is 24:6:16 or 12:3:8. Thus, the inverse of the law is not correct.

Answer 1

yes, this is a limitation along with if isotope of same element gets involved in compound formation in a specific manner.