For evaporation of water the sign of `Delta H` is …..and sign of `Delta S` is ……

Answer

To determine the signs of ΔH (change in enthalpy) and ΔS (change in entropy) for the evaporation of water, we can follow these steps:

### Step 1: Understand the Process of Evaporation
Evaporation is the process where liquid water transforms into water vapor (gas). This process requires energy, which is absorbed from the surroundings.

### Step 2: Analyze ΔH (Change in Enthalpy)
- During evaporation, energy is absorbed to break the intermolecular forces holding the water molecules together in the liquid state.
- Since energy is absorbed, the change in enthalpy (ΔH) for the process is positive.

**Conclusion for Step 2:**
ΔH > 0 (positive)

### Step 3: Analyze ΔS (Change in Entropy)
- Entropy is a measure of disorder or randomness in a system.
- When water evaporates, the molecules move from a more ordered liquid state to a less ordered gaseous state. This increase in disorder means that the entropy increases.

**Conclusion for Step 3:**
ΔS > 0 (positive)

### Final Answer
- The sign of ΔH for the evaporation of water is **positive** (ΔH > 0).
- The sign of ΔS for the evaporation of water is **positive** (ΔS > 0).