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4 marksMole Concept

CSEC Chemistry · May/June 2011 · Paper 2 · Question 5(c)

Copper is produced when dry ammonia is passed over heated copper(II) oxide. The equation is: 2NH₃ + 3CuO → 3Cu + 3H₂O + N₂.

Calculate the mass of copper produced if 0.12 dm³ of nitrogen is produced at room temperature and pressure (rtp). (Relative atomic mass of Cu = 64; One mole of gas occupies 24 dm³ at rtp.)

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Other parts of this question

  1. 5(a)(i)Use the information given to place Metal X, copper and iron in the order in which they will appear in the reactivity series, starting with the MOST reactive.[2 marks]
  2. 5(a)(ii)Write an ionic equation for the reaction between Metal X and copper(II) sulphate. Include the relevant state symbols.[2 marks]
  3. 5(b)(i)What is an alloy?[1 mark]
  4. 5(b)(ii)Name the alloy of copper and aluminium.[1 mark]
  5. 5(b)(iii)State TWO properties of aluminium that make the alloy in (b) (ii) a good choice to be used in the manufacture of aircraft.[3 marks]
  6. 5(b)(iv)List TWO other uses of this alloy.[2 marks]

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