Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is
Zn^2+(aq) + 2e^- → Zn(s)
For a large batch of nails, a manufacturer needs to plate a total zinc mass of 4.00 kg on the surface to get adequate coverage.
How many moles of zinc are in 4.00 kg of zinc?
Express your answer to three significant figures and include the appropriate units.