The heat of adsorption physisorption lies in the range ……….`kJ mol^(-1)`

Explanation

To determine the heat of adsorption for physisorption, we need to understand the characteristics of physisorption and the typical energy changes involved.

### Step-by-Step Solution:

1. **Understanding Physisorption**:
- Physisorption refers to the physical adsorption of molecules onto a surface. It involves weak van der Waals forces (such as London dispersion forces) between the adsorbate and the adsorbent.
- Since these interactions are weak, the heat of adsorption is relatively low compared to chemisorption, which involves stronger chemical bonds.

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