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  4. Suppose the elements X and Y combine to form two compounds XY2 and X3Y2. When 0.1 mole of XY2 weighs 10 g and 0.05 mole of X3Y2 weighs 9 g, the atomic weights of X and Y are

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Q. Suppose 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

NEETNEET 2016Some Basic Concepts of Chemistry

Solution:

For $X Y_{2}$
$\because 0.1$ mole
$X Y_{2}$
$\equiv 10\, g$
$\therefore 1$ mole
$X Y_{2}$
$\equiv 100\, g$
$=X+2 Y=100$.......(i)
For $X_{3} Y_{2}$
$\because 0.05$ mole
$X_{3} Y_{2}$
$\because 9\, g$
$\therefore 1$ mole $X_{3} Y_{2} \equiv 180\, g$
(ii) On solving, $X=40$ And $Y=30$