In expression`DeltaG =DeltaH -T DeltaS` `DeltaH` and `DeltaS` are respectively

Options

A. `Delta H` - temperature, `DeltaS` - enthalpy change
B. `Delta H` - enthalpy, `DeltaS` - entropy
C. `Delta H` - enthalpy change, `DeltaS` - entropy change
D. `Delta H` - entropy change, `DeltaS` - enthalpy change

Answer

To solve the question regarding the expression \( \Delta G = \Delta H - T \Delta S \), we need to identify what \( \Delta H \) and \( \Delta S \) represent.

### Step-by-Step Solution:

1. **Understanding the Expression**:
The expression \( \Delta G = \Delta H - T \Delta S \) is known as the Gibbs free energy equation. Here, \( \Delta G \) represents the change in Gibbs free energy of a system.

**Hint**: Remember that Gibbs free energy is a thermodynamic potential that helps predict the direction of chemical reactions.

2. **Identifying \( \Delta H \)**:
In this equation, \( \Delta H \) stands for the change in enthalpy. Enthalpy is a measure of the total energy of a thermodynamic system, including internal energy and the energy required to make room for it by displacing its environment.

**Hint**: Think of enthalpy as the heat content of the system at constant pressure.

3. **Identifying \( \Delta S \)**:
The term \( \Delta S \) represents the change in entropy. Entropy is a measure of the disorder or randomness in a system. It quantifies the amount of energy in a physical system that is not available to do work.

**Hint**: Entropy can be thought of as a measure of uncertainty or the number of ways a system can be arranged.

4. **Combining the Information**:
Thus, we can summarize:
- \( \Delta H \) is the change in enthalpy (heat content).
- \( \Delta S \) is the change in entropy (disorder).

5. **Conclusion**:
Based on the definitions, the correct answer to the question is that \( \Delta H \) is the enthalpy change and \( \Delta S \) is the entropy change.

**Final Answer**: \( \Delta H \) is enthalpy change, and \( \Delta S \) is entropy change.