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Table 3-2 AH of Some Common Substances Substance Substance AHO (kJ/mol) O AH (kJ/mol) -285.8 H.O(1) -110.5 Nalg) 0 NaCl(s) -411.2 -393.5 C (graphite) CO(g) CO2lg) CH,OH() CaCO3(s) CaOs) -46.3 -277.7 NH, (g) 90.29 NO(g) -1 206.9 33.85 -635.6 NO (9) N,Olg) Oslo) 81.56 -824.2 0 Fe,O3(s) H2O(g) -241.8
Exercises on Thermochemical Equations Objective: Perform calculations involving thermochemical equations Estimated Time Frame: 20 minutes --- ΔΗ AHM ahan - Procedure A. Calculate the standard enthalpies of the following reactions from the standard molar enthalpies of formation of the reactants and products. Write your solutions in a separate sheet of paper and submit it to your teacher. Identify if the reaction is endothermic or exothermic. Endothermic or Exothermic? 1. 2NH, (g) + 3N,O(g) 4N, (g) + 3H,011) 2. Caco, (s) CaOs) + CO (g) 3. Clgraphite) + O2(g) - CO, (9) B. Hess's Law. Identify if the reaction is endothermic or exothermic. Chlorine trifluoride is a colorless, poisonous, and corrosive gas. It is produced from the reaction between chlorine fluoride and fluorine gas. CIF(g) + Falg) - ClF. (g) Determine the AH for the overall reaction based on the three-step thermochemical processes below: (1) 2clF(g) + O2(g) - ClO(g) + F,Olg) AH=167.5 kJ (2) 2C1F3(g) + 20 (9) cl,O(g) + 3F,O (9) AH=341.4 kJ (3) 2F,Olg) 2F2(g) + O2(g) AH= 43.4 kJ