History homework help. History homework help. The standard heat of reaction is -178.3 kJ.
We have the following information:
For most chemistry problems involving ##?H_f^”o”##, you need the following equation:
##?H_(rxn)^”o” = ??H_f^”o”(“p”) – ??H_f^”o”(“r”)##,
where ##”p”## = products and ##”r”## = reactants.
##??H_f^”o”(“p”) = 1 cancel(“mol CaCO?”) × “-1206.9 kJ”/(1 cancel(“mol CaCO?”)) = “-1206.9 kJ”##
##??H_f^”o”(“r”) = 1 cancel(“mol CaO”) × “-635.09 kJ”/(1cancel(“mol CaO”)) + “1 mol” cancel(“CO?”) × “-393.509 kJ”/(1cancel(“mol CO?”)) = “-1028.599 kJ”##
##?H_(“rxn”)^”o” = ??H_f^”o”(“p”) – ??H_f^”o”(“r”) = “-1206.9 kJ + 1028.599 kJ” = “-178.3 kJ”##
