Suppose the elements X and Y combine to form two compounds XY2 and X3Y2 . When 0.1 mole of XY2 weighs 10g and 0.05 mole of X3Y2 weighs 9g , 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 10g and 0.05 mole of X3Y2 weighs 9g , 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 masses of X and Y be Ax and AY , respectively For XY2,nxY2=0.1=(10/ AX + 2 AY) or Ax+2Ay=100 For X3Y2 , nx3 r2=0.05=(9/3 Ax + 2 AY) or 3Ax+2AY=180 On solving Eqs. (i) and (ii) , we get Ax=40gmol- 1 AY=30gmol- 1

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 :

$40, 30$

$60, 40$

$20, 30$

$30, 20$

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 :

40,30

60,40

20,30

30,20

Let, atomic masses of X and Y be Ax​ and AY​ , respectively For XY2​,nxY2​​=0.1=AX​+2AY​10​ or Ax​+2Ay​=100 For X3​Y2​ , nx3​r2​​=0.05=3Ax​+2AY​9​ or 3Ax​+2AY​=180 On solving Eqs. (i) and (ii) , we get Ax​=40gmol−1 AY​=30gmol−1

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 :

$40, 30$

$60, 40$

$20, 30$

$30, 20$