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?

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