Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 moleSuppose the elements $X$ and $Y$ combine to form two compounds $XY_2$ and $X_3Y_2$. When $0.1$ mole of $XY_2$ weighs $10\ g$ and $0.05$ mole of $X_3Y_2$ weighs $9\ g$, the atomic weights of $X$ and $Y$ are (a) $40,\ 30$ (b) $60,\ 40$ (c) $20,\ 30$ (d) $30,\...