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In the solution for problem 5I.23, I noticed that the values for the equilibrium concentrations of the reaction were rounded according to sig figs before they were plugged into the equation to find Kc. Is this a universal rule for rounding? If not, how do we know when to apply sig figs?
I don't know why they were rounded before plugging in. But the general rule for tests, midterm, and final is to keep as many digits as possible (in multi-step problems) for each calculation and at the end when you have a final answer, go according to the least number of sig figs in the problem.
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