Question

Assume that each of copper atom has one free electron. Estimate the number of free electrons in 1 mg of copper. Given that atomic weight of copper =63.5 and Avogadro number =6.02xx10^(23). What is the charge possessed by these free electrons?

Answer 1

Answer:

1.6C

Explanation:

let the number of electrons in 1mg copper be x and let the charge be q

therefore,

x/6.023 x 10^23= 1/63.5 x 10^3

x/6.023 x 10^23=1/63500

x=(6 x 10^23)/6.3 x 10^4

x= 10^19

now q=ne

q=10^19 x 1.6 x 10^19

q=1.6C