Question Detail
Question
For H2(g) + 1/2 O2(g) -> H2O(l), ΔH = __________ kJ.
Correct Answer
Option B is the correct answer.
Detailed Explanation
The standard enthalpy of formation for liquid water, ΔH_f°(H2O(l)), is -285.8 kJ/mol, often rounded to -286 kJ/mol.
Hint
A very common, highly exothermic formation reaction.