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No, in problems only the significant figures given in the problem matter for the significant figures in your final answer. For example, if you use the conversion factor 35.45 g/mol, this number would not change the number of significant figures in your final answer. And if the problem gave 3.45 g as a given amount, this would affect the number of sig figs in your answer.
What about when you are calculating molar mass and the problem gives you a rounded mass for an element, such as 16 g for oxygen or 1 g for hydrogen? Are those also considered conversion factors or do you use them when determining sig figs?
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