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The percentage of nitrogen by mass in ammonium sulphate is closest to

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The percentage of nitrogen by mass in ammonium sulphate is closest to (atomic masses H = 1, N =- 14, O = 16, S = 32)

(A)  21%

(B)  24%

(C)  36%

(D)  16%

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Correct option  (A) 21% 

Explanation:

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