# 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

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 ,

and

as saluiy , we get

Option 1)

40, 30

Correct

Option 2)

60, 40

Incorrect

Option 3)

20, 30

Incorrect

Option 4)

30, 20

Incorrect

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