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The dot at the end of this sentence has ...

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

Text Solution

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1 micro gram `= 1 mu g = 10^(-6) g`
1 mole of `C = 12 g = 6.023 xx 10^(23) "atoms"`
`12 g of C = 6.023 xx 10^(23) "atoms"`
`10^(-6) g of C = (6.023 xx 10^(23) xx 10^(-6))/(12) = 5 xx 10^(16) "atoms" of C`
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