The formula of nitronium nitrate is

Options

A. `HNO_3`
B. `NaNO_3`
C. `N_2O_3`
D. `N_2O_5`

Explanation

To determine the formula of nitronium nitrate, we will analyze the components involved in its structure.

### Step-by-Step Solution:

1. **Understanding Nitronium Ion**:
The nitronium ion is represented as \( \text{NO}_2^+ \). It is a positively charged ion (cation) formed from nitrogen and oxygen.

2. **Understanding Nitrate Ion**:
The nitrate ion is represented as \( \text{NO}_3^- \). It is a negatively charged ion (anion) consisting of nitrogen and three oxygen atoms.

3. **Combining the Ions**:
To form nitronium nitrate, we need to combine the nitronium ion (\( \text{NO}_2^+ \)) with the nitrate ion (\( \text{NO}_3^- \)).

4. **Writing the Formula**:
The combination of one nitronium ion and one nitrate ion gives us the formula:
\[ \text{NO}_2^+ + \text{NO}_3^- \rightarrow \text{N}_2\text{O}_5 \]
This indicates that the overall compound consists of two nitrogen atoms and five oxygen atoms.

5. **Final Formula**:
Therefore, the formula of nitronium nitrate is \( \text{N}_2\text{O}_5 \).

### Final Answer:
The formula of nitronium nitrate is \( \text{N}_2\text{O}_5 \).