Write the relationship between enthalpy change, `DeltaH `and internal energy change, `DeltaU` , for a process occuring at constant pressure and constant temperature.

Explanation

To derive the relationship between the change in enthalpy (ΔH) and the change in internal energy (ΔU) for a process occurring at constant pressure and constant temperature, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Enthalpy and Internal Energy**:
- The enthalpy (H) is defined as:
\[
H = U + PV
...