Question

A student used a carbon pencil to write his homework the mass of this was found to be 5mg with the help of this calculate the number of carbon atoms in 12mg of his homework wriiting

Answer 1

Explanation:

A)carbon pencil mass =5mg=5×10^-3g

there for mole of carbon pencil=

mass/molar mass

5×10^-3/12

=4.16×10^-4

B)same as . mole of carbon atom=mass/molar mass×avagdro number

12×10^-3/12×6.002×10^23

=6.002×10^20