page 08 12. Which of the following equations represents an enthalpy of combustion? A 2CH4(g) + 3O2(g) ↓ 2CO(g) + 4H2O(ℓ) B CH4(g) + 1 1 2O2(g) ↓ CO(g) + 2H2O(ℓ) C 2C2H6(g) + 7O2(g) ↓ 4CO2(g) + 6H2O(ℓ) D C2H6(g) + 3 1 2O2(g) ↓ 2CO2(g) + 3H2O(ℓ) 13. Two flasks, A and B, were placed in a water bath at 40°C. B A ethanol and ethanoic acid ethyl ethanoate and water water at 40°C After several days, the contents of the flasks were analysed. Which results would be expected? A Flask A contains ethyl ethanoate, water, ethanol and ethanoic acid; flask B is unchanged. B Flask A contains only ethyl ethanoate and water; flask B is unchanged. C Flask A contains only ethyl ethanoate and water; flask B contains only ethanol and ethanoic acid. D Flask A and flask B contain ethyl ethanoate, water, ethanol and ethanoic acid.
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This question is part of the UK A-Level Chemistry syllabus. In the actual exam, structured questions typically require linking specific keywords to gain full marks. Applaa helps you drill these topics.
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