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1 markThe Mole Concept

CAPE Chemistry Unit 1 · 2006 · Paper 2 · Question 1(a)(i)

In an experiment to determine the empirical and molecular formulae of a hydrocarbon, A, the hydrocarbon is completely burnt in excess oxygen and the products collected. A gave 3.52 g of carbon dioxide and 1.62 g of water, on complete combustion. [Mr CO2 = 44; Mr H2O = 18]

Calculate the mass of carbon in 3.52 g of carbon dioxide

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  1. 1(a)(ii)Calculate the mass of hydrogen in 1.62 g of water.[1 mark]
  2. 1(b)Use the answers obtained in (a) (i) and (a) (ii) to calculate the empirical formula of A.[2 marks]
  3. 1(c)The molar mass of A is 114 g mol-¹. Calculate its molecular formula.[2 marks]
  4. 1(d)(i)Describe simple tests that could be used to confirm that the products of the combustion of A are water and carbon dioxide (You must include in your answer the…[2 marks]
  5. 1(d)(ii)Describe simple tests that could be used to confirm that the products of the combustion of A are water and carbon dioxide (You must include in your answer the…[2 marks]

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