1. The problem statement, all variables and given/known data The oxides of a certain element contain 27.28%, 42.86% and 52.94% oxygen. What is the ratio of valencies of the element in the 3 oxides? 2. Relevant equations 3. The attempt at a solution Following calculations were made: Molecular mass of the first oxide is 58.6, second oxide is 37.3 and that of the third is 30.22 Do specify if the above calculations are also right or wrong.