Find δh°rxn for the reaction ch4(g) + 2o2(g) → co2(g) + 2h2o(l). [δh°f (ch4(g)) = –74.8 kj/mol; δh°f (co2(g)) = –393.5 kj/mol; δh°f (h2o(l)) = –285.5 kj/mol]

answer: -

reaction:

na + cl ⇌ nacl

balanced chemical equation:

na + 2cl ⇌ nacl2

sodium + clorine goes to form sodium chloride (table salt).

the product is nacl2.

and the reactants are na and cl.

(note: if you don’t know what ⇌ means, read below: -

⇌(double head arrow) means reversible reaction).