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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

$15 \times 10^{10} atoms$

b

$7 \times 10^{18} atoms$

c

$5 \times 10^{16} atoms$

d

None

answer is A.

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Detailed Solution

12g of ‘C’ contains $6.023 \times 10^{23} atoms .$

1 microgram $= 10^{- 6} g$

Number of atoms $= \frac{10^{- 6} g \times 6.023 \times 10^{23} atoms}{12 g}$

$= 5 \times 10^{16} atoms$

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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.