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)

 

Molar Mass -

The mass of one mole of a substance in grams is called its molar mass.

- wherein

 Molar mass of water = 18 g mol-1

 

 

 Let the atomic weight of X  = x 

    and atomic weight of  Y = y

then ,  x+2y = \frac{10}{0.1}

and  3x+2y = \frac{9}{0.05} = 180

as saluiy , we get 

x=40

y=30


Option 1)

40, 30

Correct

Option 2)

60, 40

Incorrect

Option 3)

20, 30

Incorrect

Option 4)

30, 20

Incorrect

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