Xét lần lượt các chất:
Ure: \((NH_2)_2CO\)
\( \to {M_{{{(N{H_2})}_2}CO}} = (14 + 1.2).2 + 12 + 16 = 60\)
\( \to \% {m_N} = \frac{{14.2}}{{60}} = 46,67\% \)
Amoni sunfat: \((NH_4)_2SO_4\).
\( \to {M_{{{(N{H_4})}_2}S{O_4}}} = (14 + 1.4),2 + 32 + 16.4 = 132\)
\( \to \% {m_N} = \frac{{14.2}}{{132}} = 21,21\% \)
Amoni nitrat \(NH_4NO_3\)
\( \to {M_{N{H_4}N{O_3}}} = 14 + 1.4 + 14 + 16.3 = 80\)
\( \to \% {m_N} = \frac{{14.2}}{{80}} = 35\% \)
Amoni hidrophotphat \((NH_4)_2HPO_4\).
\( \to {M_{{{(N{H_4})}_2}HP{O_4}}} = (14 + 1.4).2 + 1 + 31 + 16.4 = 132\)
\( \to \% {m_N} = \frac{{14.2}}{{132}} = 21,21\% \)
