Discussion
The behavior of Cl2 is closest to ideal gas behavior at
Answer: C
Cl2 is most nearly ideal at 200 °C and 0.50 atm.
A real gas approaches ideal behaviour when its molecules are far apart (low pressure) and move fast enough for intermolecular attractions to matter little (high temperature). Both conditions make the molecular volume and the attractive forces negligible.
Of the options, 200 °C with 0.50 atm combines the highest temperature with the lowest pressure. 0 °C and 0.50 atm has the same low pressure but a lower temperature, where chlorine's fairly strong attractions show more. The 10.0 atm options compress the gas, and −100 °C at 10.0 atm is close to conditions where chlorine liquefies.
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