If heats of combustion of red phosphorus and yellow phosphors are `-8.78` KJ and `-9.19` Kj respectively then heat of transitionof yellow phosphorus to red phosphrus will be

Options

A. `17.97 KJ`
B. `-17.97Kj`
C. `-1.13Kj`
D. `+1.13KJ`

Explanation

To find the heat of transition from yellow phosphorus to red phosphorus, we can use the heats of combustion of both forms of phosphorus. The heat of transition can be calculated using the formula:

\[ \Delta H_{\text{transition}} = \Delta H_{\text{combustion (yellow)}} - \Delta H_{\text{combustion (red)}} \]

### Step-by-Step Solution:

1. **Identify the heats of combustion**:
- Heat of combustion of yellow phosphorus (\( \Delta H_{\text{combustion (yellow)}} \)) = \(-9.19 \, \text{KJ}\)
- Heat of combustion of red phosphorus (\( \Delta H_{\text{combustion (red)}} \)) = \(-8.78 \, \text{KJ}\)

2. **Substitute the values into the formula**:
\[ \Delta H_{\text{transition}} = (-9.19 \, \text{KJ}) - (-8.78 \, \text{KJ}) \]

3. **Simplify the equation**:
\[ \Delta H_{\text{transition}} = -9.19 \, \text{KJ} + 8.78 \, \text{KJ} \]

4. **Calculate the result**:
\[ \Delta H_{\text{transition}} = -0.41 \, \text{KJ} \]

### Final Answer:
The heat of transition from yellow phosphorus to red phosphorus is \(-0.41 \, \text{KJ}\).