Which one has the highest percentage of nitrogen

Options

A. Urea
B. Ammonium sulphate
C. Ammonium nitrate
D. Calcium nitrate

Explanation

To determine which compound has the highest percentage of nitrogen, we will calculate the percentage of nitrogen in each of the given compounds: urea, ammonium sulfate, ammonium nitrate, and calcium nitrate.

### Step 1: Calculate the percentage of nitrogen in Urea (NH₂CONH₂)

1. **Determine the molar mass of urea:**
- Nitrogen (N): 2 × 14 g/mol = 28 g/mol
- Carbon (C): 1 × 12 g/mol = 12 g/mol
- Oxygen (O): 1 × 16 g/mol = 16 g/mol
- Hydrogen (H): 4 × 1 g/mol = 4 g/mol
- Total molar mass of urea = 28 + 12 + 16 + 4 = 60 g/mol

2. **Calculate the percentage of nitrogen:**
\[ \text{Percentage of Nitrogen} = \left( \frac{\text{Mass of Nitrogen}}{\text{Total Mass of Compound}} \right) \times 100 \]
\[ \text{Percentage of Nitrogen in Urea} = \left( \frac{28}{60} \right) \times 100 \approx 46.67\% \]

### Step 2: Calculate the percentage of nitrogen in Ammonium Sulfate ((NH₄)₂SO₄)

1. **Determine the molar mass of ammonium sulfate:**
- Nitrogen (N): 2 × 14 g/mol = 28 g/mol
- Sulfur (S): 1 × 32 g/mol = 32 g/mol
- Oxygen (O): 4 × 16 g/mol = 64 g/mol
- Hydrogen (H): 8 × 1 g/mol = 8 g/mol
- Total molar mass of ammonium sulfate = 28 + 32 + 64 + 8 = 132 g/mol

2. **Calculate the percentage of nitrogen:**
\[ \text{Percentage of Nitrogen in Ammonium Sulfate} = \left( \frac{28}{132} \right) \times 100 \approx 21.21\% \]

### Step 3: Calculate the percentage of nitrogen in Ammonium Nitrate (NH₄NO₃)

1. **Determine the molar mass of ammonium nitrate:**
- Nitrogen (N): 2 × 14 g/mol = 28 g/mol
- Oxygen (O): 3 × 16 g/mol = 48 g/mol
- Hydrogen (H): 4 × 1 g/mol = 4 g/mol
- Total molar mass of ammonium nitrate = 28 + 48 + 4 = 80 g/mol

2. **Calculate the percentage of nitrogen:**
\[ \text{Percentage of Nitrogen in Ammonium Nitrate} = \left( \frac{28}{80} \right) \times 100 = 35\% \]

### Step 4: Calculate the percentage of nitrogen in Calcium Nitrate (Ca(NO₃)₂)

1. **Determine the molar mass of calcium nitrate:**
- Calcium (Ca): 1 × 40 g/mol = 40 g/mol
- Nitrogen (N): 2 × 14 g/mol = 28 g/mol
- Oxygen (O): 6 × 16 g/mol = 96 g/mol
- Total molar mass of calcium nitrate = 40 + 28 + 96 = 164 g/mol

2. **Calculate the percentage of nitrogen:**
\[ \text{Percentage of Nitrogen in Calcium Nitrate} = \left( \frac{28}{164} \right) \times 100 \approx 17.07\% \]

### Step 5: Compare the percentages

- Urea: 46.67%
- Ammonium Sulfate: 21.21%
- Ammonium Nitrate: 35%
- Calcium Nitrate: 17.07%

### Conclusion

The compound with the highest percentage of nitrogen is **Urea** with approximately **46.67%** nitrogen content.