Among the following common nitrogenous fertilizers, which one contains the lowest percentage of nitr

Question

Among the following common nitrogenous fertilizers, which one contains the lowest percentage of nitrogen by mass?

Professor PC Thomas Classes · Answer

(a) : Let us calculate the percentage of Nitrogen in each fertilizer. (1) Ammonium sulphate, $(\mathrm{NH}_4)_2\mathrm{SO}_4$: Molar mass $= 132 \mathrm{~g/mol}$. $\%$ N $= \frac{28}{132} 	imes 100 = 21.2\%$. (2) Calcium cyanamide, $\mathrm{CaCN}_2$: Molar mass $= 40 + 12 + 28 = 80 \mathrm{~g/mol}$. $\%$ N $= \frac{28}{80} 	imes 100 = 35.0\%$. (3) Urea, $\mathrm{NH}_2\mathrm{CONH}_2$: Molar mass $= 60 \mathrm{~g/mol}$. $\%$ N $= \frac{28}{60} 	imes 100 = 46.6\%$. (4) Ammonium nitrate, $\mathrm{NH}_4\mathrm{NO}_3$: Molar mass $= 80 \mathrm{~g/mol}$. $\%$ N $= \frac{28}{80} 	imes 100 = 35.0\%$. Ammonium sulphate has the lowest nitrogen content.