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  • 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</sub

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

Option: 1

40, 30


Option: 2

60, 40


Option: 3

20, 30


Option: 4

30, 20


Answers (1)

Let the atomic weight of X  = x 

    and atomic weight of  Y = y

then,  x+2y = \frac{10}{0.1}=100

and  3x+2y = \frac{9}{0.05} = 180

On  solving, we get 

x=40

y=30

Therefore, the correct option is (1).

Posted by

Sumit Saini

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