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Problem
The following compounds are used in the production of fertilizers. Determine which has the highest percentage by mass of nitrogen:
NH
3
\text{NH}_3
NH
3
,
CO
(
NH
)
2
\text{CO}(\text{NH})_2
CO
(
NH
)
2
,
(
NH
4
)
2
SO
4
(\text{NH}_4)_2\text{SO}_4
(
NH
4
)
2
SO
4
.
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