Igcse Model Questions Vol1 2019 Chemistry Question 35
Practice objective / multiple choice question 35 from the 2019 Igcse Model Questions Vol1 Chemistry examination.
A steel pipe (iron) has an internal diameter of 30 cm and a length of 5.0 m. In seawater the corrosion current density for iron is measured as 2.5 \muA cm^{-2}. Assuming both the inner and outer cylindrical surfaces are equally exposed, calculate (a) the mass of iron lost after 6 months, and (b) if a protective coating reduces the current density by 40 \%, what is the percentage reduction in the mass loss? Use Faraday's constant F = 96485 C mol^{-1} and the molar mass of iron M_{Fe} = 55.85 g mol^{-1}. Assume the corrosion reaction is Fe \rightarrow Fe^{2+} + 2e^{-}.
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This is Igcse Model Questions Vol1 2019 Chemistry Question 35. It is one of the objective questions from the 2019 Igcse Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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