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Question

12 gram of an alkaline earth metal gives 14.8grams of its nitride.The atomic mass of the metal is


Solution

let the metal be M with atmic wt. be x
so
     3M + N2 ---->M3N2
     3x ---->3x+28      ; Atomic mass of N=14
so,
12/3x   = 14.8/(3x+28)
12/14.8 = 3x/(3x+28)

which in solving for x gives 40,
the metal is calcium(atomic mass=40) and its nitride is Ca3N2




 

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