Quelpr
1 markEnergetics

CAPE Chemistry Unit 1 · 2005 · Paper 2 · Question 5(d)(i)

Suggest why the standard enthalpy of formation of carbon monoxide from C(s) and O2(g) cannot be determined directly by experiment.

The mark scheme is shown once you've answered.

Practise this question

Other parts of this question

  1. 5(a)Explain the meaning of the term enthalpy change of a reaction.[2 marks]
  2. 5(b)Distinguish between exothermic and endothermic reactions by referring to energy profile diagrams and bond energies.[6 marks]
  3. 5(c)(i)Write a balanced equation for the reaction of hydrazine with chlorine to produce hydrogen chloride and nitrogen.[2 marks]
  4. 5(c)(ii)Given ΔH = -420 kJ mol^-1 for the reaction in (c)(i), calculate the enthalpy change when 12.7 g of hydrazine reacts completely.[2 marks]
  5. 5(c)(iii)Calculate the enthalpy of reaction for N2H4(l) + O2(g) -> N2(g) + 2H2O(g) (ΔH = -534 kJ mol^-1) if liquid water is formed, given the molar enthalpy of…[4 marks]
  6. 5(d)(ii)Construct an energy cycle diagram showing how standard enthalpies of combustion of carbon and carbon monoxide are used to obtain the standard enthalpy of…[3 marks]

More practice: the rest of this paper · more Energetics questions · all CAPE Chemistry Unit 1 past papers