Question

A student puts his signature with graphite pencil.
If the mass of carbon in the signature is 10-12g, calculate
the number of carbon atoms in the signature.
the answer is 5.01 x 10^10 atom
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Answer 1

answer : 6.022×10^23 atom

exp:

one mole of any element = its atomic mass

carbon's atomic mass weighs 12g.

= 1mole of carbon = 12g

1 mole = 6.o22×10^23 no. of atoms/ molecules/ions.

= in 12g of carbon there will be 6.022×10^23 number of atoms.

where as in 1g of carbon there will be 6.022×10^23/12 number of atoms = 5.018×10^22 atoms.