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In HW problem number 11.67, we are given the original partial pressures of each molecule. When making the ICE chart, it says that it is easier to push the reaction as far to the left as possible then start from new initial conditions. What are other situations in which we must change the initial values and use the new ones? How are we supposed to know when to do that instead of using the original given values?
If the way the answer key did it is confusing to you, you can actually do it the other way if you want. I believe they did it that way to make the math easier but in general you can just follow the steps outlined in lecture.
You can do it when it isn't obvious which direction the reaction will go. You push the reaction all the way to one side so you know what will be produced and consumed. You could also calculate Q to figure that out.
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