"standard molar enthalpy:
h2o ( liquid water ) : - 285.8 kj/mole
h2o ( water vapor ) : - 241.8 kj / mole.
δhrxn = - 241. 8 - ( - 285.8 )= -241.8 + 285.8 = 44.0
answer: 44.0 kj"
answer carbon and three oxygen atoms;