Calculate which of the following nitrogen fertilizers is richest in nitrogen: NaNO3, Ca (NO3) 2,

Calculate which of the following nitrogen fertilizers is richest in nitrogen: NaNO3, Ca (NO3) 2, KNO3, NH4NO3, (NH4) 2SO4.

Given:
NaNO3
Ca (NO3) 2
KNO3
NH4NO3
(NH4) 2SO4

To find:
ω (N) -?

1) Mr (NaNO3) = Ar (Na) * N (Na) + Ar (N) * N (N) + Ar (O) * N (O) = 23 * 1 + 14 * 1 + 16 * 3 = 85 ;
2) ω (N in NaNO3) = N (N in NaNO3) * Ar (N) * 100% / Mr (NaNO3) = 1 * 14 * 100% / 85 = 16.47%;
3) Mr (Ca (NO3) 2) = Ar (Ca) * N (Ca) + Ar (N) * N (N) + Ar (O) * N (O) = 40 * 1 + 14 * 2 + 16 * 6 = 164;
4) ω (N in Ca (NO3) 2) = N (N in Ca (NO3) 2) * Ar (N) * 100% / Mr (Ca (NO3) 2) = 2 * 14 * 100% / 164 = 17.07%;
5) Mr (KNO3) = Ar (K) * N (K) + Ar (N) * N (N) + Ar (O) * N (O) = 39 * 1 + 14 * 1 + 16 * 3 = 101 ;
6) ω (N in KNO3) = N (N in KNO3) * Ar (N) * 100% / Mr (KNO3) = 1 * 14 * 100% / 101 = 13.86%;
7) Mr (NH4NO3) = Ar (N) * N (N) + Ar (H) * N (H) + Ar (N) * N (N) + Ar (O) * N (O) = 14 * 1 + 1 * 4 + 14 * 1 + 16 * 3 = 80;
8) ω (N in NH4NO3) = N (N in NH4NO3) * Ar (N) * 100% / Mr (NH4NO3) = 2 * 14 * 100% / 80 = 35%;
9) Mr ((NH4) 2SO4) = Ar (N) * N (N) + Ar (H) * N (H) + Ar (S) * N (S) + Ar (O) * N (O) = 14 * 2 + 1 * 8 + 32 * 1 + 16 * 4 = 132;
10) ω (N in (NH4) 2SO4) = N (N in (NH4) 2SO4) * Ar (N) * 100% / Mr ((NH4) 2SO4) = 2 * 14 * 100% / 132 = 21.21 %.

Answer: The richest in nitrogen – NH4NO3 – 35%.