CBSE Class 11-science Answered
12g of alkaline earth metal gives 14.8g of its nitride . Atomic weight of metal is?
Asked by sunarmik das | 25 Jul, 2011, 12:39: AM
Expert Answer
Let M is the alkaline metal with atomic weight = X u
Therefore 3M2+ + 2N3- 
So, 3 moles of M2+ gives 1 moles of 
or, 3X gm of M2+ gives (3X +28) gm of
or, 1 gm of M2+ gives
or ,12 gm of M2+ gives
But 12 gm of M2+ gives 14.8 gm of nitride.
Therefore
or, 3X + 28 = 3.7X
X = 40 u
Therefore, the atomic weight of metal is 40 u.
Answered by | 25 Jul, 2011, 11:35: AM
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