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2 marksThe Mole Concept

CAPE Chemistry Unit 1 · 2014 · Paper 2 · Question 1(b)(i)b)

A metal carbonate, M₂CO₃, reacts with hydrochloric acid according to the equation: M₂CO₃(aq) + 2HCl(aq) → 2MCl(aq) + CO₂(g) + H₂O(l). A solution was prepared by dissolving 6.125 g of M₂CO₃ in 1 dm³ of water. 40 cm³ of this solution neutralized 23.6 cm³ of 0.150 mol dm⁻³ hydrochloric acid.

Calculate the relative molecular mass of M₂CO₃.

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Other parts of this question

  1. 1(a)(i)Define the term 'mole'.[2 marks]
  2. 1(a)(ii)Define the term 'molar mass' (include the units).[2 marks]
  3. 1(b)(i)a)Calculate the number of moles of M₂CO₃.[2 marks]
  4. 1(b)(ii)Deduce the identity of M.[2 marks]
  5. 1(c)Outline the experimental steps required to carry out the reaction described in (b) on page 2.[5 marks]

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