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2. One of the assumptions of the Ideal Gas Law is that no forces of attraction between gas particles exist. Water is a polar
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Answer #1

As the forces of attraction are high, so the molecules of water are significantly attracted to each other. As a result, their movement is no longer free. So, they can't hit the walls of the container, in which they are kept, with as much force as they would if moving freely. The pressure is generated by molecules constantly hitting the walls. That's why the actual pressure will be lower than that calculated. That means, the calculated pressure is higher.

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