1.

Suppose the elements X and Y combine to form two compounds XY_(2) and X_(3)Y_(2). When 0.1 mole of XY_(2) weights 10 g and 0.05 mole of X_(3)Y_(2) weights 9 g, the atomic weight of X and Y are

Answer»

30, 20
40, 30
60, 40
20, 30

Solution :For `XY_(2)""n=W/M`
`0.1=10/(X+2Y)=X+2Y=100` ...(i)
For `X_(3)Y_(2)""n=W/M`
`0.05=9/(3X+2Y)=3X+2Y=180` ...(ii)
From (i) and (ii)
`2X=80`
`X=40 and 2Y=100-40=60`
`=Y=30`


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