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Question

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

A
20, 30
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B
30, 20
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C
40, 30
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D
60, 40
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Solution

The correct option is C 40, 30
Let atomic weight of X is AX and Y is AY

nXY2=0.1=10AX+2AY

AX+2AY=100(1)

nX3Y2=0.05=93AX+2AY

3AX+2AY=180(2)

On solving eq. (1) and (2)

AX=40, AY=30

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