Question

The number of carbon atoms present in a signature, if a signature written by carbon pencil, weighing 1.2×10^-3

Answer 1

Answer:

Explanation:

 we know that moles = given weight/ atomic weight

                       moles of carbon in signature= 1.2 * 10^-3/12

                         which gives  moles  =  10^-4

we also know that 1 mole contains 6.022 x 10²³ atoms

therefore 10 ^ -4 moles will contain 10^-4 x 6.022 x 10²³

the ultimate answer is 6.022  x 10^19 atoms