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5 marksMole Concept

CSEC Chemistry · January 2013 · Paper 2 · Question 4(c)

A current of 5 A is passed for 10 minutes through the molten MgI₂. Calculate the mass of product that will be formed at the cathode. (Relative atomic masses: Mg = 24; I = 127) (1 Faraday = 96 500 C mol⁻¹)

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  1. 4(a)Explain why magnesium conducts electricity when solid but magnesium iodide (MgI₂) only conducts electricity when molten or in solution.[4 marks]
  2. 4(b)(i)Draw a labelled diagram of apparatus which could be used in the electrolysis of molten MgI₂.[2 marks]
  3. 4(b)(ii)Write equations to indicate the chemical reactions which will occur at EACH electrode.[4 marks]

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