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C(graphite)+O2(g)>CO2(g)2CO(g)+O2(g)>2CO2(g)H=393.5kJH=566.0kJ To calculate the enthalpy change for the reaction: 2C(graphite)+O2(g)>2CO(g)H=? Standard Enthalpies of Formation Question 2: Use the following equation and data to calculate the enthalpy of formation, per mole, of ZnS(s). 2ZnS(s)+3O2(g)>2ZnO(s)+2SO2(g)H=878.2kJ Heats of Reaction and Reaction Stoichiometry Question 3: Calcium oxide (lime) reacts with carbon dioxide to form calcium carbonate (chalk). CaO(s)+CO2(g)>CaCO3(s)H=178.4kJ How many kJ of heat are evolved in a reaction of 0.500kgCaO(s) with an excess of carbon dioxide? First Law of Thermodynamics Question 4: What is the change in internal energy of a system that gives off 89J of heat and has 531J of work done on it? Specific Heat Question 5: A 9.13g sample of vanadium is heated to 99.10C and is then dropped into 20.0g water in a calorimeter. The water temperature rises from 20.51 to 24.46C. Calculate the specific heat of vanadium. Chapter 11: CHEMICAL BONDING I Question 6: Assign the formal charges to each atom in the following structures