`HNO_(3)` on dehydration with phosphorus pentaoxide yields `:`

Explanation

To answer the question, "HNO3 on dehydration with phosphorus pentoxide yields:", we can follow these steps:

### Step-by-step Solution:

1. **Identify the Reactants**:
The reactants in this reaction are nitric acid (HNO3) and phosphorus pentoxide (P2O5 or P4O10).

2. **Understand the Role of Phosphorus Pentoxide**:
Phosphorus pentoxide is a powerful dehydrating agent. This means it can remove water (H2O) from other compounds.

3. **Write the Reaction**:
When HNO3 is dehydrated by P2O5, the reaction can be represented as:
\[ 4 \text{HNO}_3 + \text{P}_2\text{O}_5 \rightarrow 2 \text{N}_2\text{O}_5 + 4 \text{HPO}_3 \]
Here, HNO3 reacts with P2O5 to produce dinitrogen pentoxide (N2O5) and metaphosphoric acid (HPO3).

4. **Identify the Products**:
The products of the reaction are:
- Dinitrogen pentoxide (N2O5)
- Metaphosphoric acid (HPO3)

5. **Final Answer**:
Therefore, the final answer to the question is that HNO3 on dehydration with phosphorus pentoxide yields N2O5 and HPO3.