Suppose the elements X and Y combine to form two compounds XY_2 and X_3 Y_2. When 0.1 mole of XY_2 weighs 10 g and 0.05 mole of X_3 Y_2 weighs 9 g,…

Suppose the elements X and Y combine to form two compounds $\displaystyle \mathrm{XY}_2$ and $\displaystyle \mathrm{X}_3 \mathrm{Y}_2$. When $\displaystyle 0.1$ mole of $\displaystyle \mathrm{XY}_2$ weighs $\displaystyle 10$ g and $\displaystyle 0.05$ mole of $\displaystyle \mathrm{X}_3 \mathrm{Y}_2$ weighs $\displaystyle 9$ g, the atomic weights of X and Y are