**Highest nitrogen content** → highest mass percent N

$\overline{){\mathbf{mass}}{\mathbf{}}{\mathbf{percent}}{\mathbf{}}{\mathbf{N}}{\mathbf{=}}\frac{\mathbf{mass}\mathbf{}\mathbf{N}\mathbf{}\mathbf{in}\mathbf{}\mathbf{cpd}}{\mathbf{molar}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{cpd}}{\mathbf{\times}}{\mathbf{100}}}$

**a) NH _{3}**

$\mathbf{mass}\mathbf{}\mathbf{\%}\mathbf{}\mathbf{N}\mathbf{}\mathbf{=}\frac{\mathbf{14}\mathbf{.}\mathbf{0}\mathbf{}\overline{)\mathbf{g}}}{\mathbf{17}\mathbf{.}\mathbf{0}\mathbf{}\overline{)\mathbf{g}}}\mathbf{\times}\mathbf{100}\mathbf{=}$**82.4 %**

Which fertilizer has the highest nitrogen content?

a) NH_{3}

b) CO(NH_{2})_{2 }

c) NH_{4}NO_{3}

d) (NH_{4})_{2}SO_{4}

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