Nitrogen gas adsorbed on charcoal to the extent of 0.921 cm 3 g 1 at 490 kPa

Question:

Nitrogen gas adsorbed on charcoal to the extent of 0.921 cm³ g⁻¹ at 490 kPa and 190 K, but at 250 K the same amount of adsorption was achieved only when the pressure was increased to 3.2 MPa. What is the enthalpy of adsorption of nitrogen on charcoal?

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