When electricity (the flow of electrons) is passed through a solution, it causes

Question

When electricity (the flow of electrons) is passed through a solution, it causes an oxidation-reduction (redox) reaction to occur. If the solution contains a metal cation such as Ag+, the flow of electrons will reduce the silver ion, causing solid silver to plate onto the electrode. The amount of metal plated depends on the number of electrons passed.

The total charge of a mole of electrons is 96,485 coulombs (C) and

1ampere(A)=1coulomb/second(C/s)

Galvanized nails are iron nails that have been plated with zinc to prevent rusting. The relevant reaction is

Zn2+(aq)+2eZn(s)

For a large batch of nails, a manufacturer needs to plate a total zinc mass of 2.60 kg on the surface to get adequate coverage.

Part A

How many moles of zinc are in 2.60 kg of zinc?

Explanation / Answer

part A )

mass of Zn = 2.60 kg = 2.60 x 10^3 g

molar mass of Zn = 65.38 g /mol

moles of Zn = mass / molar mass

                    = 2.60 x 10^3 / 65.38

                     = 39.77

moles of Zn = 39.77

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