Delta Fares

Calculate delta H_rxn for the following reaction:?

Calculate delta H_rxn for the following reaction: CaO(s) + CO2(g) --> CaCO3(s) Use the following reactions and given . Ca(s) + CO2(g)+ 1/2 O2 (g) --> CaCO3(s), delta H =-812.8 kJ 2Ca(s) + O2 (g) ---> 2CaO(s), delta H = -1269.8 kJ Express your answer using four significant figures.

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1. Ca (s) + CO2 (g) + 1/2 O2 = CaCO3 (s) , delta H = - 812.8 kJ ( * 2 CaO (s) = 2 Ca (s) + 1/2 O2 (g) , delta H = + 1269.8 kJ CaO (s) = Ca (s) +1/2 O2 (g) , delta H =+ 634.9 kJ ( * add (* and (* Ca + CO2 + 1 /2 O2 + CaO = CaCO3 + Ca + CO2 + 1/2 O2 cancel any duplications CaO + CO2 = CaCO3 ( your equation) delta H = + 634.9 - 812.8= - 177.9 kJ