Question

calculate the total positive or negative charge on a 3.11g copper penny. Given avogadro no. and atomic number of copper is 29 and atomic mass is 63.5

Answer 1

Moles of copper-3. 11/63. 5=0. 0489
No. Of atoms-0. 0489*na=>0. 0489*6. 023*10^23=>0. 294*10^23
No. Of protons-0. 294*10^23*29=>8. 55*10^23
No. Of electrons=no. Of protons=>8. 55*10^23
Total no. Of charge-8. 55*10^23×8. 55*10^24=>17. 11×10^23