Question

Given that the atomic number of zinc is 30, and the atomic mass is 65 grams/mole, what is the net charge of just the protons in 7.3 kg of zinc?

Answer 1

atomic mass of zinc is 65 grams/mole.

Number of moles in 7.3 kg (7300g ) of zinc = 7300g / 65 grams/mole = 112.30 moles

Avogadro's number --1 mole = 6.022×10 ^23 atoms

Number of atoms ( in 7.3 kg of zinc) =112.30 moles * 6.022= 676.31 ×10 ^23 atoms

Given that the atomic number of zinc is 30 that means one atom of zinc contains 30 protons.

Number of protons ( in 7.3 kg of zinc) =676.31 ×10 ^23 atoms * 30 = 20,289.507 ×10 ^23 protons

charge of one proton = 1.6 x10^-19 C

the net charge of protons in 7.3 kg of zinc =20,289.507 ×10 ^23 protons * 1.6 x10^-19 C = 3.246 C