Consider the following intermediate reactions.
ch4(9)+202(g) → co2(g)+2h2o(g)
2h2o(g) → 2h2o(1)
ah, -- 802 kj
ah2=-88 kj
the overall chemical reaction is as follows.
ch4(9)+202(g) → co2(g)+2h2o(0)
ah2 -- 890 kj
what is the correct enthalpy diagram using the hess law for this system?

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?