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Are we suppose to round the x-value (change in concentration/pressure) in the ICE chart ? I noticed that in some of the textbook example, it rounds the x value and in other examples it doesn't round the x value. I was told that you don't and that you save the rounding for the very end (which would be the equilibrium values). Can anyone confirm this?
it's always best to save rounding for the end, and this could mean either the equilibrium constant value or the x-value, depending on what the question is asking for; basically, only round for whichever number is your final answer.
You should not round until the end of calculations. Try to keep the as many digits as possible when doing calculations or save them in your calculator. But you do have to keep track of the significant figures during calculations.
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