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

For the percent by mass N, we’re going to rewrite the equation as:

Rank the following fertilizers in decreasing order of mass percentage of nitrogen.

- (NH4)H2PO4

- (NH4)2SO4

- (NH4)2HPO4

- KNO3

- NH4NO3

- NH3

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