1. The Canadian twenty-five cent coin is made out of steel plated with 0.097 g of nickel in an electrolytic cell. If the cell uses an aqueous solution of Ni²⁺_(aq), it would take ? A of current to plate 2500 coins in one hour.

2. The cell notation below is for a Clark cell, one of the first batteries.

Zn_(s) / Zn²⁺_(aq) // Hg²⁺_(aq), Cl^-(aq) / Pt_(s)

Under standard conditions one cell of this battery would produce?

3.Blood alcohol levels can be determined in the lab by titrating the ethanol (C₂H₅OH_(aq)) in blood plasma with a potassium dichromate solution.The balanced net ionic equation is

16H⁺_(aq) + 2Cr₂O₇^2-_(aq) + C₂H₅OH_(aq) 4Cr³⁺_(aq) + 2CO_2(g) + 11H₂O_(l)

The lab technician found that it took 10.21 mL of 42.5 mmol/L Cr₂O₇^2-_(aq) solution to react with all of the alcohol in a 10.00 mL blood sample. This means the molar concentration of alcohol in the sample is Answer mmol/L.