chem 1008 prelim 1 review - CHEMISTRY 1008 Optional Review...

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CHEMISTRY 1008 Optional Review Questions for Prelim 1 1. The overall reaction in a commercial heat pack can be represented as: 4Fe (s) + 3O 2 (g) 2Fe 2 O 3 (s) H = -1652 kJ (a) How much heat is released when 4.00 moles of iron (Fe) is reacted with excess O 2 ? (b) How much heat is released when 1.00 mole Fe 2 O 3 is produced? (c) How much heat is released when 1.00 g iron is reacted with excess O 2 ? (d) How much heat is released when 10.0 g Fe and 2.00 g O 2 are reacted? 2. Consider the dissolution of CaCl 2 : CaCl 2 (s) Ca 2+ (aq) + 2Cl - (aq) H = -81.5 kJ An 11.0-gram sample of CaCl 2 is dissolved in 125g of water, with both substances at 25.0 ° C. Calculate the final temperature of the solution assuming no heat loss to the surroundings and assuming the solution has a specific heat capacity of 4.18 J ° C -1 g -1 . 3. Combustion of table sugar produces CO 2 (g) and H 2 O(l). When 1.46 grams of table sugar is combusted in a bomb calorimeter, 24.00 kJ of heat is liberated. (a) Assuming the table sugar is pure sucrose, C 12 H 22 O 11 (s), write the balanced equation for the combustion reaction. (b) Calculate U in kJ/mole C 12 H 22 O 11 for the combustion reaction of sucrose. (c) Calculate H in kJ/mole C 12 H 22 O 11 for the combustion reaction of sucrose at 25 ° C. 4. Given the following data: (a) Ca (s) + 2C (s, graphite) CaC 2 (s) H = -62.8 kJ (b) Ca (s) + ½ O 2 (g) CaO (s) H = -635.5 kJ (c) CaO (s) + H 2 O (l) Ca(OH) 2 (aq) H = -653.1 kJ (d) C 2 H 2 (g) + 5/2 O 2 (g) 2CO 2 (g) + H 2 O (l) H = -1300.0 kJ (e) C (s, graphite) + O 2 (g) CO 2 (g) H = -393.5 kJ Calculate H for the following reaction: CaC 2 (s) + 2H 2 O (l) Ca(OH) 2 (aq) + C 2 H 2 (g) H = ? 5. Given the following data: (a) C 6 H 4 (OH) 2 (aq) C 6 H 4 O 2 (aq) + H 2 (g) H = 177.4 kJ (b) H 2 (g) + ½ O 2 (g) H 2 O (g) H = -241.8 kJ (c) H 2 (g) + O 2 (g) H 2 O 2 (aq) H = -191.2 kJ (d) H 2 O (g) H 2 O (l) H = -43.8 kJ Calculate H for the following reaction: C 6 H 4 (OH) 2 (aq) + H 2 O 2 (aq) C 6 H 4 O 2 (aq) + 2H 2 O (l) H = ?
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6. Calculate H ° for each of the following equations using Appendix D and the following values: H f ° (Na 2 O(s)) = -416 kJ/mole and H f ° (N 2 H 3 CH 3 (l)) = 54.0 kJ/mole: (a) 4Na(s) + O 2 (g) 2Na 2 O(s) (b) 2Na(s) + 2H 2 O(l) 2NaOH(aq) + H 2 (g) (c) 2Na(s) + CO 2 (g) Na 2 O(s) + CO(g) (d) 5N 2 O 4 (l) + 4N 2 H 3 CH 3 (l) 12H 2 O(g) + 9N
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chem 1008 prelim 1 review - CHEMISTRY 1008 Optional Review...

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