$\overline{)\mathbf{mass}\mathbf{}\mathbf{percent}\mathbf{=}\frac{\mathbf{mass}\mathbf{}\mathbf{element}}{\mathbf{total}\mathbf{}\mathbf{mass}\mathbf{}\mathbf{of}\mathbf{}\mathbf{compound}}\mathbf{\times}\mathbf{100}}$

First, we need to get the atomic weights of each element in NH_{3} using the periodic table and then calculate its molar mass.

molar mass N = 14.01 g/mol

molar mass H = 1.01 g/mol

molar mass NH_{3} = 14.01 g/mol + (1.01 g/mol x 3)

Most fertilizers consist of nitrogen-containing compounds such as NH_{3}, CO(NH_{2} )_{2}, NH_{4} NO_{3}, and (NH_{4} )_{2} SO_{4}. Plants use
the nitrogen content in these compounds for protein synthesis.

Calculate the mass percent composition of nitrogen in NH_{3}.

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