Suppose the elements X and Y combine to form two compounds X Y2 and X3 Y2 . When 0.1 mole of X Y2 weighs 10 g and 0.05 mole of X 3 Y 2 weighs 9 g , the atomic weights of X and Y are

Question

Suppose the elements X and Y combine to form two compounds X Y2 and X3 Y2 . When 0.1 mole of X Y2 weighs 10 g and 0.05 mole of X 3 Y 2 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

Let atomic weight of element X be x and that of element Y be y. For X Y2, n=(w/M o l . w t) 0.1=(10/x+2 y) ⇒ x+2 y=(10/0.1)=100 dots (i) For X3 Y2, n=(w/ text Mol. wt. ) 0.05=(9/3 x+2 y) ⇒ 3 x+2 y=(9/0.05)=180 dots (ii) On solving equations (i) and (ii), we get y=30 x+2(30)=100 ⇒ x=100-60=40

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 0.05mole of X3​Y2​ weighs 9g, the atomic weights of X and Y are

40,30

60,40

20,30

30,20

Let atomic weight of element X be x and that of element Y be y. For XY2​,n=Mol.wtw​ 0.1=x+2y10​ ⇒x+2y=0.110​=100… (i) For X3​Y2​,n= Mol. wt. w​ 0.05=3x+2y9​ ⇒3x+2y=0.059​=180… (ii) On solving equations (i) and (ii), we get y=30 x+2(30)=100 ⇒x=100−60=40

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 $0.05 m o l e$ of $X_{3} Y_{2}$ weighs $9 g,$ the atomic weights of $X$ and $Y$ are