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Exam4B - CHEM 1211K Practice Exam Four Version B Fall 2011...

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CHEM 1211K Practice Exam Four Version B Fall 2011 1 1. A student puts 100.0 g of water at 20.0 o C into a calorimeter also at 20.0 o C that has a calorimeter constant of 117 J/K. Determine the mass of 60.0 o C water that must be added to bring the temperature inside the calorimeter to 40.0 o C. Assume that no heat leaks. The specific heat capacity of water is 4.184 J/g K. A) 100.0 g B) 128.0 g C) 95.0 g D) 73.0 g E) 28.0 g 2. Calculate the standard reaction enthalpy for the following reaction. CH 4 (g) + H 2 O(g) ° CO(g) + 3H 2 (g) Given: 2H 2 (g) + CO(g) ° CH 3 OH(l) ° H ° = 128.3 kJ CH 4 (g) + ½ O 2 (g) ° CH 3 OH(l) ° H ° = 164.05kJ 2H 2 O(g) ° 2H 2 (g) + O 2 (g) ° H ° = 483.6 kJ 3. Calculate DH for the reaction PCl 5 (g) PCl 3 (g) + Cl 2 (g) given the information below: P 4 (s) + 6Cl 2 (g) 4PCl 3 (g) Δ H = -2439 kJ P 4 (s) + 10Cl 2 (g) 4PCl 5 (g) Δ H = -3438 kJ 4. The overall reaction in a commercial heat pack can be represented as 4Fe(s) + 3O 2 (g) Æ 2Fe 2 O 3 (s) Δ H o = -1652 kJ mol rxn What is the change in enthalpy when 0.0179 mole of iron is reacted with excess O 2 (g)? A) – 7.40 kJ B) – 22.2. kJ C) – 29.6 kJ D) – 118 kJ E) – 413 kJ
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CHEM 1211K Practice Exam Four Version B Fall 2011 2 5. The standard enthalpy of formation of ammonium perchlorate at 298 K is 295.31 kJ°mol 1 . Which equation represents the enthalpy of formation? A) ½N 2 (g) + ½Cl 2 (g) + 2O 2 (g) + 2H 2 (g) + 295.31 kJ° NH 4 ClO 4 (s) B) ½N 2 (g) + ½Cl 2 (g) + 2O 2 (l) + 2H 2 (g) ° NH 4 ClO 4 (s) + 295.31 kJ C) N 2 (g) + Cl 2 (g) + 4O 2 (g) + 4H 2 (g) ° 2NH 4 ClO 4 (s) + 590.62 kJ D) ½N 2 (g) + ½Cl 2 (g) + 2O 2 (g) + 2H 2 (g) ° NH 4
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