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2 marksMole Concept

CSEC Chemistry · May/June 2017 · Paper 2 · Question 2(a)(i)

Lesley needs to weigh 0.20 moles of aspirin. She reads the label on the aspirin bottle, shown in Figure 4, which provides information such as formula (C₉H₈O₄), molar mass (180 g mol⁻¹), melting point (136 °C), boiling point (140 °C), and density (1.40 g cm⁻³).

Define EACH of the following terms: Mole; Molar mass.

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Other parts of this question

  1. 2(a)(ii)Calculate the mass Lesley would have to weigh to obtain 0.20 moles of aspirin.[1 mark]
  2. 2(a)(iii)Jared, another student in Lesley's class, weighed 18.0 g of aspirin. Calculate the number of moles of aspirin he weighed.[1 mark]
  3. 2(b)Calculate the mass of ethanoic acid formed when Jared's 18.0 g of aspirin is hydrolysed. [Molar mass of ethanoic acid = 60.0 g mol⁻¹][3 marks]
  4. 2(c)(i)Define the term 'electrolyte'.[1 mark]
  5. 2(c)(ii)Identify the ions that are produced from ethanoic acid during electrolysis.[2 marks]
  6. 2(c)(iii)Define the term 'cathode'.[1 mark]
  7. 2(c)(iv)Predict which ion from (c) (ii) will migrate to the cathode.[1 mark]
  8. 2(c)(v)Is ethanoic acid a strong or weak electrolyte? Explain your answer.[3 marks]

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