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Use the information below to answer the question that follows.
Calculate the enthalpy change for the reaction CaO(s)+#CO_2#(g)#to# #CaCO_3#(s)
#Ca(s)+1/2O_2(g) toCaO(s) DeltaH=-635kJmol^-1#
#C(s) +O_2(s) to CO_2(s) DeltaH=-394kJmol^-1#
#Ca(s)+C(s)+3/2O_2(g) to CaCO_3(s) DeltaH=-1207kJmol^-1#