Calculate and compare where is the higher nitrogen content in potassium nitrate, calcium nitrate or ammonium nitrate?

Let’s calculate the mass fraction of nitrogen in the proposed nitrate:

1.w (N in KNO3) = Ar (N): Mr (KNO3);

Mr (KNO3) = 39 + 14 + 3 * 16 = 101;

w (N in KNO3) = 14: 101 = 0.1386 or 13.86%;

2.w (N in Ca (NO3) 2) = 2 * Ar (N): Mr (Ca (NO3) 2);

Mr (Ca (NO3) 2) = 40 + 28 + 6 * 16 = 164;

w (N in Ca (NO3) 2) = 28: 164 = 0.1707 or 17.07%;

3. w (N in NH4NO3) = 2 * Ar (N): Mr (NH4NO3);

Mr (NH4NO3) = 28 + 4 + 3 * 16 = 80;

w (N in NH4NO3) = 28: 80 = 0.35 or 35%;

4.Let’s compare the nitrogen content in nitrate:

w (N in KNO3) <w (N in Ca (NO3) 2) <w (N in NH4NO3) = 13.86% <17.07% <35%.

Answer: 13.86% N in KNO3, 17.07% N in Ca (NO3) 2, 35% N in NH4NO3, there is more nitrogen in ammonium nitrate.