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Question 19N.2.sl.TZ0.3c(ii)

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Date November 2019 Marks available [Maximum mark: 3] Reference code 19N.2.sl.TZ0.3c(ii)
Level sl Paper 2 Time zone TZ0
Command term Determine Question number c(ii) Adapted from N/A
c(ii).
[Maximum mark: 3]
19N.2.sl.TZ0.3c(ii)

The following shows some compounds which can be made from ethene, C2H4.

ethene (C2H4) → C2H5Cl → C2H6O → C2H4O

(c(ii))

Determine the enthalpy of combustion of the organic product in (b), in kJ mol−1, using data from section 11 of the data booklet.

[3]

Markscheme

bonds broken:
5(C–H) + C–C + C–O + O–H + 3(O=O)
OR
5(414«kJ mol−1») + 346«kJ mol−1» + 358«kJ mol−1» + 463«kJ mol−1» + 3(498«kJ mol−1») / 4731 «kJ» ✔


bonds formed:
4(C=O) + 6(O–H)
OR
4(804«kJ mol−1») + 6(463«kJ mol−1») / 5994 «kJ» ✔
«ΔH = bonds broken − bonds formed = 4731 − 5994 =» −1263 «kJ mol−1» ✔

NOTE: Award [3] for correct final answer.

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