One mole of calcium nitride on the reaction with an excess of water gives

Options

A. two moles of ammonia
B. two moles of nitric acid
C. one mole of ammonia
D. one mole of nitric acid

Answer

To solve the question, we need to determine the products formed when one mole of calcium nitride reacts with an excess of water.

### Step-by-Step Solution:

1. **Identify the Reactants**:
- We have one mole of calcium nitride (Ca₃N₂).

2. **Write the Reaction with Water**:
- Calcium nitride reacts with water (H₂O). The reaction can be represented as:
\[ \text{Ca}_3\text{N}_2 + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2 + \text{NH}_3 \]

3. **Determine the Products**:
- The products of the reaction are calcium hydroxide (Ca(OH)₂) and ammonia (NH₃).

4. **Balance the Chemical Equation**:
- We need to balance the equation.
- From the formula Ca₃N₂, we know there are 3 calcium (Ca) atoms and 2 nitrogen (N) atoms.
- To balance the equation, we will need:
- 3 moles of calcium hydroxide (Ca(OH)₂) for 3 calcium atoms.
- 2 moles of ammonia (NH₃) for 2 nitrogen atoms.
- The balanced equation becomes:
\[ \text{Ca}_3\text{N}_2 + 6\text{H}_2\text{O} \rightarrow 3\text{Ca(OH)}_2 + 2\text{NH}_3 \]

5. **Count the Moles of Products**:
- From the balanced equation, we see that:
- 3 moles of calcium hydroxide (Ca(OH)₂) are produced.
- 2 moles of ammonia (NH₃) are produced.

6. **Conclusion**:
- Therefore, when one mole of calcium nitride reacts with excess water, it produces 3 moles of calcium hydroxide and 2 moles of ammonia.

### Final Answer:
- The answer to the question is that one mole of calcium nitride reacts with excess water to give **2 moles of ammonia (NH₃)**.