The actual pressure exerted by a real gas is theoretically modelled to be lower than the pressure ca — States of Matter and Gaseous State Chemistry Question
Question
The actual pressure exerted by a real gas is theoretically modelled to be lower than the pressure calculated for an ideal gas under identical conditions. What is the fundamental cause of this pressure drop?
Answer: B
💡 Solution & Explanation
In a real gas, molecules experiencing a net inward interaction from bulk molecules (attractive forces) will strike the container wall with a lower velocity and less momentum than they would if there were no attractive forces. This reduces the overall force per unit area on the wall, resulting in an actual pressure that is lower than the ideal pressure.
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