M3D2: Significant Figures, Measurement, and Mole

After reviewing the concept of significant figures, measurements, and moles, write a thoughtful, complete, but concise statement in response to the following questions:

1. Why is using significant figures a practical method for talking about molar quantities of substances?

2. If a typical postcard is 0.1 mm thick, how tall would a stack of 6.022 x 1023 postcards be?

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