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.