Which of the following compounds has highest percentage of nitrogen :

Options

A. Ferriferro cyanide, `Fe_(4) [Fe(CN)_(6)]_(3)` ?
B. Aluminium nitrate, `Al(NO_(3))_(3)` ?
C. Ammonium dichromate, `(NH_(4))_(2)Cr_(2)O_(7)` ?
D. None of these

Explanation

To determine which compound has the highest percentage of nitrogen, we will calculate the percentage of nitrogen in each of the three given compounds: ferriferrosynide, aluminium nitrate, and ammonium dichromate.

### Step 1: Calculate the molecular mass and percentage of nitrogen in Ferriferrosynide (Fe₄[Fe(CN)₆]₃)

1. **Identify the formula**: Ferriferrosynide is given as Fe₄[Fe(CN)₆]₃.
2. **Combine the elements**: This can be rewritten as Fe₇C₁₈N₁₈.
3. **Calculate the molecular mass**:
- Iron (Fe): 56 g/mol, so for 7 Fe: \(7 \times 56 = 392\) g/mol
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