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Dobereneir's Triad

Three elemts ...

Question

Three elemts X,Yand Z form a Dobereiner triad. Their atomic weight of X,Y,Z are in the ratio
5:11:7. If the sum of teh atomic weight of extreme elements is 176 find the atomic weights of X,Y and Z.

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Solution

$T h e a t o m i c w e i g h t o f t h r e e e l e m e n t s x, y, z a r e i n t h e r a t i o = 5 : 11 : 7 T h e s u m o f t h e a t o m i c w e i g h t o f e x t r e m e e l e m e n t s x + z = 176 A t o m i c w e i g h t o f y = \frac{176}{2} = 88 g A t o m i c w e i g h t o f x = \frac{5}{12} \times 176 = 73.3 A t o m i c w e i g h t o f z = 176 - 73.3 = 102.7$

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