A-LevelChemistryChemical energetics9701/12 · May/June 2014 · Q81 Mark
Which equation represents the standard enthalpy change of formation of ethanol, C2H5OH?
A2C(g) + 3H2(g) + ½O2(g) → C2H5OH(l)
B2C(s) + 3H2(g) + ½O2(g) → C2H5OH(l)
C2C(s) + 3H2(g) + ½O2(g) → C2H5OH(g)
D2C(g) + 6H(g) + O(g) → C2H5OH(l)
✓ Correct answer
B: 2C(s) + 3H2(g) + ½O2(g) → C2H5OH(l)
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