The enthalpy changes, δH , for three reactions are given. H2(g)+12o2(g)ca(s)+2h+(aq)cao(s)+2h +(aq)⟶h2o(l)⟶ca2+(aq)+h2(g)⟶ca2+(aq )+h2o(l)δH=−286 kj/molδH=−544 kj/molδH=−193 kj/mol using hess's law, calculate the heat of formation for cao(s) using the reaction shown. Ca(s)+12o2(g)⟶cao(s).

the answer is:

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answer:

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explanation: