... 1 = 40 56 O ? 16 x 1 = 16 ? = 56 2.1 _ 84 0.025 H2 = ?84 Kj mol Due to the fact that I am using Hess' Law in order to calculate a value for the enthalpy change of the reaction by an indirect method, the H2 must be reversed so the result is changed to a positive number as shown below. H3 CaCO3 (s) CaO (s) + CO2 H1 HCl H2 HCl CaCl2 (aq) H3 CaCO3 (s) CaO (s) + CO2 H1 HCl H2 HCl CaCl2 (aq) In order to calculate the H3 you must firstly calculate the enthalpy change of H1 and H2, then reverse the Evaluation Errors In Procedure One error in the procedure of the experiment was hat the calcium oxide and the calcium carbonate were in lumps so the surface ...

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