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Since the beaker is an open system, you can assume that the pressure is whatever the atmospheric pressure is. Unless you are somehow constantly changing in elevations or something else, I think you can otherwise assume that the pressure is constant?
All of the above answers are correct. Something that I found helpful to remember regarding the differences between a system and its surroundings is the ocean analogy. Spilling half a liter of water into the ocean doesn't affect its pressure.
Maya Gollamudi 1G wrote:In an open beaker system, how do we know that the system is at constant pressure?
The pressure in an open beaker is constant.
The surrounding system is so large that your reaction will have virtually no influence on the surrounding system's pressure; as a result, your pressure is constant.
An open beaker system allows the exchange of pressure between its surroundings and the system. Since the atmosphere is relatively large, the pressure of the beaker will not have an effect on it, almost like a drop-in-the-bucket type deal. We can then infer a constant pressure because of this.
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