For each reaction, identify another quantity that is equal to δh∘rxn.δhrxn∘. ch4(g)+2o2(g)⟶co2(g)+2h2o(l)ch4(g)+ 2o2(g)⟶co2(g)+2h2o(l) 4×bond energy of c−h4×bond energy of c−h enthalpy of combustion of ch4ch4 −4×bond energy of c−h−4×bond energy of c−h enthalpy of formation of co2(g)co2(g) ch4(g)⟶c(g)+4h(g)ch4(g)⟶c(g)+4h(g) 4×bond energy of c−h4×bond energy of c−h −4×bond energy of c−h−4×bond energy of c−h enthalpy of formation of c(g)c(g) enthalpy of combustion of ch4ch4 c (graphite)+2h2(g)⟶ch4(g)c (graphite)+2h2(g)⟶ch4(g) enthalpy of combustion of ch4ch4 −4×bond energy of c−h−4×bond energy of c−h enthalpy of formation of ch4(g)ch4(g) 4×bond energy of c−h4×bond energy of c−h c(g)+4h(g)⟶ch4(g)c(g)+4h(g)⟶ch4(g) −4×bond energy of c−h−4×bond energy of c−h 4×bond energy of c−h4×bond energy of c−h enthalpy of combustion of cc enthalpy of formation of ch4(g)