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

Question

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 (A) 40, 30 (B) 60, 40 (C) 20, 30 (D) 30 , 20

Tardigrade Admin · Accepted Answer

For X Y2 ∵ 0.1 mole X Y2 ≡ 10 g ∴ 1 mole X Y2 ≡ 100 g =X+2 Y=100.......(i) For X3 Y2 ∵ 0.05 mole X3 Y2 ∵ 9 g ∴ 1 mole X3 Y2 ≡ 180 g (ii) On solving, X=40 And Y=30

Q. Suppose the elements $X$ and $Y$ combine to form two compounds $X Y_{2}$ and $X_{3} Y_{2}$ . When $0.1$ mole of $X Y_{2}$ weighs $10 g$ and $0.05$ mole of $X_{3} Y_{2}$ weighs $9 g$ , the atomic weights of $X$ and $Y$ are

40, 30

60, 40

20, 30

30 , 20

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

Q. Suppose the elements X and Y combine to form two compounds XY2​ and X3​Y2​. When 0.1 mole of XY2​ weighs 10g and 0.05 mole of X3​Y2​ weighs 9g, the atomic weights of X and Y are