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The number of sig figs depends on the lowest sig fig of the numbers give in the problem. However, if the problem does not mention any numbers that you can base your sig figs on, I think it's safe to have at least 4 sig figs.
The number of sig figs you keep always depends on the lowest amount of sig figs used in the question. For ex., if the question uses the numbers 7.0g, 3g,and 0.003004g, your answer should use one sig fig, because its dependent on 3g.
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