The standard enthalpy of formation of H2O (l) is -285.8 kJ/mol. Calculate ∆E° for the following

Question

reaction.
H2O (l) → H2 (g) + 1/2 O2 (g)

Answer 1

dE = q+w
dE = dH+w
You know dH.
w is pdV = delta n(RT)
where work is negative since the gases are doing work against atmospheric pressure.