The concept of a mole is often a difficult one to grasp. It seems abstract, but

Question

The concept of a mole is often a difficult one to grasp. It seems abstract, but it’s really no more abstract than the concept of a dozen. What makes it abstract is the scale of Avogadro’s number and the fact that we cannot see an atom or molecule with the naked eye. However, proper use of significant figures and scientific notation can make dealing with numbers on the order of Avogadro’s number manageable. After reviewing the concept of significant figures, measurements, and moles, write a thoughtful, complete, but concise statement in response to the following questions: Why is using significant figures a practical method for talking about molar quantities of substances? If a typical postcard is 0.1 mm thick, how tall would a stack of 6.022 x 1023 postcards be?

Explanation / Answer

a. Significant figures are the number of digits used to express calculated quantity and also we can know the precision of measured quantity.

b.

if a postcard is 0.1mm thick,

then 6.022 x 1023 postcards have thickness of 6.022 x 1023 x 0.1mm = 6.022 x 1022 = 6. x 1022mm

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