Question

How many atoms would be present in a black dot marked on the paper with graphite pencil as a full stop at the end of a sentence. [Given mass of a dot = 10- 18 g]

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Answer

1 mole of carbon atoms weigh = 12 g

Also, 1 mole of carbon atoms = 6.022 x 1023 atoms

Thus, 12 g of carbon atoms has 6.022 x 1023 atoms.

10 18 g of carbon will have 6.022𝑥1023/12 x 10– 18 carbon atoms

                                                  = 5.02 × 10 4 carbon atoms.

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