The adsorption isobar for a certain gas-solid system reveals two distinct regimes: physical adsorpti — Surface Chemistry Chemistry Question
Question
The adsorption isobar for a certain gas-solid system reveals two distinct regimes: physical adsorption at $100\text{ K}$ with an enthalpy of adsorption of $-30\text{ kJ mol}^{-1}$, and chemical adsorption at $450\text{ K}$ with an enthalpy of $-180\text{ kJ mol}^{-1}$. What is the absolute difference between these two enthalpies in $\text{kJ mol}^{-1}$?
Answer: 150
💡 Solution & Explanation
The enthalpy of physisorption is $-30\text{ kJ mol}^{-1}$ and the enthalpy of chemisorption is $-180\text{ kJ mol}^{-1}$. The absolute difference between these values is $ | -180 - (-30) | = | -150 | = 150\text{ kJ mol}^{-1}$.
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