A signature written in carbon pencil weighs 1 2mg. Determine the number of carbon atoms present in the signature.
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Answer:
given mass of carbon in sign=12*10^-3
molar mass of carbon is =12g
moles=12*10^-3/12
=10^-3
no.of particles=10^-3*6..022*10^23=6.022*10^20
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