Neco 2024 Chemistry Question 28
Practice objective / multiple choice question 28 from the 2024 Neco Chemistry examination.
A brass alloy consists of copper and zinc with a mass composition of 70 % Cu and 30 % Zn. A flat sheet of this alloy has a uniform thickness of \(1.0\ \text{mm}\) and an area of \(1.0\ \text{m}^{2}\). When exposed to air, only the zinc component corrodes, forming ZnO. The corrosion rate of zinc is \(0.02\ \text{mm yr}^{-1}\). Densities: \(\rho_{\text{Cu}} = 8.96\ \text{g cm}^{-3}\), \(\rho_{\text{Zn}} = 7.14\ \text{g cm}^{-3}\).\n\n(a) Calculate the mass of zinc lost from the sheet each year (in grams).\n(b) Assuming the alloy loses mass only through zinc corrosion, estimate how many years it will take for the sheet to lose 5 % of its total initial mass.
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About This Question
This is Neco 2024 Chemistry Question 28. It is one of the objective questions from the 2024 Neco Chemistry examination.
Difficulty level: Hard .
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