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Grade: 12
        12g of an alkaline earth metal gave 14.8g of its nitride.Atomic wt of that metal is
10 years ago

Answers : (3)

Ramesh V
70 Points
							

let the metal be M with atmic wt. be x

so 3M + N2 ---->M3N2

      3x                   3x+28

 so,  12/3x   = 14.8/(3x+28)

which in solving for x gives 40

the metal is calcium and its nitride is Ca3N2

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10 years ago
mohd atif chaudhary
17 Points
							
Mass of metal is 12g and Mass of metal nitride is 14.8gm so Mass of nitride ion is 2.8 gm.
By using equivalence law: Mass of metal / Mass of Nitride ion =Equivalent Mass of metal/14 
12/2.8=3x/14
x=20 as x is equivalent weight by multiplying it with 2 which is valency of metal ion. We get 40. 
Before x is 3 is used which is valency of Nitride and 14 is Mass of N .
 
one year ago
mohd atif chaudhary
17 Points
							Mass of metal is 12g and Mass of metal nitride is 14.8gm so Mass of nitride ion is 2.8 gm.By using equivalence law: Mass of metal / Mass of Nitride ion =Equivalent Mass of metal/14 12/2.8=3x/14x=20 as x is equivalent weight by multiplying it with 2 which is valency of metal ion. We get 40. Before x is 3 is used which is valency of Nitride and 14 is Mass of N .
						
one year ago
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