Which of the following fertilizers has the highest nitrogen percentage?

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Solution

(A) % of nitrogen in $(N H_{4})_{2} S O_{4} = \frac{28}{132} \times 100 = 21.21 %$
(B) % of nitrogen in $C a C N_{2} = \frac{28}{80} \times 100 = 35 %$
(C % of nitrogen in $C O (N H_{2})_{2} = \frac{28}{60} \times 10 = 46.66 %$
(D) % of nitrogen $N H_{4} N O_{3} = \frac{28}{80} \times 100 = 35 %$

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