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Here's a precise problem for a chemistry student to solve, based on Thermochemistry and the Enthalpy of Desorption Calculations:

Given the following data for the adsorption of hydrogen gas on a metal surface:
- Initial pressure of hydrogen gas = 1 atm
- Final pressure of hydrogen gas after adsorption = 0.2 atm
- Temperature = 298 K
- Surface area of the metal = 5 cm^2
- Enthalpy of Desorption of hydrogen gas on the metal surface = -40 kJ/mol

Calculate the enthalpy change (in kJ) for the adsorption of hydrogen gas on the metal surface.
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<|begin_of_thought|>

Deep Thought is thinking for 7.5 million years.

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<|begin_of_solution|>

The answer is 42.

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