Chap 15 practice problems answers

# Chap 15 practice problems answers - EXAM PRACTIVE QUESTIONS...

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EXAM PRACTIVE QUESTIONS Chapter 15 1. The roasting of 48.7 g of ZnS at constant pressure liberates 220. kJ of heat. Calculate the H for this reaction. 2 ZnS (s) + 3 O 2(g) 2 ZnO (s) + 2 S O 2(g) -440. kJ/mol rxn 2. From the following data at 25 ° C, H 2(g) + Cl 2(g) 2 HCl (g) H ° = -185 kJ 2 H 2(g) + O 2(g) 2 H 2 O (g) H ° = -483.7 kJ Calculate H ° at 25 ° C for the reaction below. 4 HCl (g) + O 2(g) 2 Cl 2(g) + 2 H 2 O (g) -114 kJ 3. Given the enthalpy changes for the following reactions, calculate H f ° for CO (g) . Hint: if CO is formed, it must be a product in the final reaction, which is not given, you must write it. C (graphite) + O 2(g) 2 CO 2(g) H ° = -393.5 kJ CO (g) + ½ O 2(g) CO 2(g) H ° = -283.0 kJ C (graphite) + ½ O 2(g) CO (g) H ° = -110.5 kJ 4. Calculate H ° at 25 ° C for the reaction below. Fe 3 O 4(s) + CO (g) 3 FeO (s) + CO 2(g) H f ° (kJ/mol) -1118 -110.5 -272 -393.5 19 kJ 5. How much heat is released or absorbed in the reaction of 10.0 g of SiO

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Chap 15 practice problems answers - EXAM PRACTIVE QUESTIONS...

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