The oxides of a certain (hypothetical) element contain 27.28%, 42.86% and 52.94% oxygen. What is the ratio of the valencies of the element in the 3 oxides?

The oxide of an element contains 67.67% of oxygen. Equivalent weight of the element is

The oxide of an element contains 67.67% of oxygen. Equivalent weight of the element is

If the oxides of a metal contain 78.7% and 64.5% of oxygen and if the formual of the first oxides is MO, find the formula of other oxide, the ratio of oxygen in two oxides is 1:3.

An oxide of a metal contains 40% oxygen, by weight. What is the equivalent weight of the metal ?

Two oxides of a metal contain 36.4% and 53.4% of oxygen by mass respectively. If the formula of the first oxide is M_(2)O , then that of the second is