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

First, we need to get the atomic weights of each element in (NH_{4})_{2}SO_{4} 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 S = 32.06 g/mol

molar mass O = 16.00 g/mol

molar mass (NH_{4})_{2}SO_{4} = (14.01 g/mol x 2) + (1.01 g/mol x 8) + 32.06 g/mol + (16.00 g/mol x 4)

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_{4} )_{2} SO_{4}.

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