An aluminium sacrificial anode of initial mass 0.80 kg attached to a steel tankundergoes the following corrosion half-reaction:Al Al³+ + 3eOver a period of 5 years the average corrosion current is 32 mA. The mass of amole of aluminium is 27 g and the charge on a mole of electrons is 96500 C.State whether the corrosion half-reaction shows oxidation or reduction.b) Calculate, to the nearest 0.01 kg, how much mass is lost by the sacrificialanode over 5 years. You can assume that each year has 365 days. Showeach step of your working.

Increasing the oxidation number indicate the oxidation and reducing the oxidation number indicate…

a) State whether the corrosion half-reaction shows oxidation or reduction. b) Calculate, to the nearest 0.01 kg, how much mass is lost by the sacrificial anode over 5 years. You can assume that each year has 365 days. Show each step of your working.

a) State whether the corrosion half-reaction shows oxidation or reduction. b) Calculate, to the nearest 0.01 kg, how much mass is lost by the sacrificial anode over 5 years. You can assume that each year has 365 days. Show each step of your working.

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 14P

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Question

An aluminium sacrificial anode of initial mass 0.80 kg attached to a steel tank
undergoes the following corrosion half-reaction:
Al Al³+ + 3e
Over a period of 5 years the average corrosion current is 32 mA. The mass of a
mole of aluminium is 27 g and the charge on a mole of electrons is 96500 C.
State whether the corrosion half-reaction shows oxidation or reduction.
b) Calculate, to the nearest 0.01 kg, how much mass is lost by the sacrificial
anode over 5 years. You can assume that each year has 365 days. Show
each step of your working.

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