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Q.

The dot at the end of this sentence has a mass of about one microgram. Assuming that the black stuff is Carbon, calculate approximate atoms of Carbon needed to make such a dot.

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a

15×1010 atoms

b

7×1018 atoms

c

5×1016 atoms

d

None

answer is A.

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Detailed Solution

12g of ‘C’ contains 6.023×1023atoms.

1 microgram =10-6 g

Number of atoms =10-6g×6.023×1023 atoms12g

=5×1016 atoms

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