W(KNO3) W(N) (NH4NO3)= 35% W(N)CA(NO3) W(N) (NH4)2 SO4
It looks like you're dealing with a classroom board that includes several chemical compounds and their nitrogen content. Here's a breakdown:
KNO3 (Potassium Nitrate): Calculate the weight percentage of nitrogen (W(N)) in potassium nitrate by using the formula: \[ W(N) = \left(\frac{\text{Atomic weight of N}}{\text{Molecular weight of KNO3}}\right) \times 100 \]
NH4NO3 (Ammonium Nitrate): The weight percentage of nitrogen is given as 35%.
Ca(NO3)2 (Calcium Nitrate): Similarly, calculate the weight percentage of nitrogen. \[ W(N) = \left(\frac{2 \times \text{Atomic weight of N}}{\text{Molecular weight of Ca(NO3)2}}\right) \times 100 \]
(NH4)2SO4 (Ammonium Sulfate): Calculate the weight percentage of nitrogen. \[ W(N) = \left(\frac{2 \times \text{Atomic weight of N}}{\text{Molecular weight of (NH4)2SO4}}\right) \times 100 \]
To find the atomic weights, use the periodic table:
- Nitrogen (N) = 14.01 g/mol
- Potassium (K) = 39.10 g/mol
- Oxygen (O) = 16.00 g/mol
- Calcium (Ca) = 40.08 g/mol
- Sulfur (S) = 32.07 g/mol
- Hydrogen (H) = 1.01 g/mol
Calculate the molecular weight by summing the atomic weights of each element in the compound and use these to find the percentages.
