This print-out should have 31 questions. Multiple-choice questions may continue on 1. +216 kJ . mol-1 the next column or page - find all choices 2. +412.1 kJ . mol-1 before answering. 3. +155.5 kJ . mol-1 4. +42.0 kJ . mol- 001 1.0 points 5. +206.1 kJ . mol- A 1.00 g sample of n-hexane (C6H14) under- goes complete combustion with excess O2 in 004 1.0 points a bomb calorimeter. The temperature of the Calculate the standard enthalpy change for 1502 g of water surrounding the bomb rises the reaction from 22.64 C to 29.30 C. The heat capacity of the hardware component of the calorimeter 2 HCI(g) + F2(g) - 2 HF(() + Cl2(g) (everything that is not water) is 4042 J/C. What is AU for the combustion of n-C6H14? given One mole of n-C6H14 is 86.1 g. The specific heat of water is 4.184 J/g.C. 4 HCI(g) + 02(g) - 2H20(0) + 2 Cl2(g) 1. -4.52 x 103 kJ/mol 2. -1.15 x 10# kJ/mol AH = -202.4 kJ/mol rxn 3. -5.92 x 103 kJ/mol 4. -9.96 x 103 kJ/mol 5. -7.40 x 10* kJ/mol *H2 (8) + F2 (8) - HF(@) AH = -600.0 kJ/mol rxn 002 1.0 points When 0.100 g of graphite is burned com- pletely in a bomb calorimeter (heat capacity H2(g) + = 02(g) - H2O(l) = 3.344 kJ/C), containing 3000 g of water, a temperature rise of 0.21 C is observed. What AH = -285.8 kJ/mol rxn is AE for the combustion of graphite? The specific heat of liquid water is 4.184 J/g.C. 1. AH = -1587.2 kJ/mol rxn 2. AH = +1116.6 kJ/mol rxn 1. AE = -3.34 kJ/mol 3. AH = -1015.4 kJ/mol rxn 2. AE = -40.1 kJ/mol 4. AH = +1088.2 kJ/mol rxn 3. AE = -401.0 kJ/mol 5. AH = -516.6 kJ/mol rxn 4. AE = +3.34 kJ/mol 6. AH = +1015.4 kJ/mol rxn 5. AE = -285. kJ/mol 7. AH = +1587.2 kJ/mol rxn 8. AH = -1116.6 kJ/mol rxn 003 1.0 points 9. AH = -1088.2 kJ/mol rxn Calculate the standard reaction enthalpy for 10. AH = +516.6 kJ/mol rxn the reaction. CH4(g) + H20(g) - CO(g) + 3 H2(g) 005 1.0 points What mass of ethanol (C2HOH(()) must be given burned to supply 500 kJ of heat? The stan- 2 H2(g) + CO(g) - CH3OH(() dard enthalpy of combustion of ethanol at 298 AH = -128.3 kJ . mol-1 K is -1368 kJ . mol. 2 CH4(g) + 02(g) - 2 CH3OH(1) AH = -328.1 kJ . mol-1 1. 16.8 g 2 H2(g) + 02(g) - 2H20(g) 2. 126 g AH = -483.6 kJ . mol-1 3. 2.74 g 2 4. 29.7 g 5. 10.9 g2 4. HCI(g) and Na(s) 5. HCI(g), Na(s) and F2(g) 006 1.0 points 009 1.0 points Consider the reaction HINT: Write a balanced chemical equation that illustrates the standard enthalpy of for- 2 Al203(s) -+ 4 Al(s) + 3 02(g) . mation of Mn203. The standard enthalpy of formation of AH = +3339.6 kJ/mol Mn203 is -962.3 kJ/mol. How much heat What is AH for the formation of one mole energy is liberated when 5.4 grams of man- of Al203(s) from the elements? ganese are oxidized by oxygen gar . Mn203 at standard state conditions? 1. -6679.2 kJ Answer in units of KJ. 2. -3339.6 kJ 3. +1669.8 kJ 010 1.0 points 4. +3339.6 kJ What would be the sign of AH for the reac- 5. -1669.8 kJ tion CHA(g) - CH3(g) + H(g) ? 007 1.0 points The combustion of sucrose (a carbohydrate) 1. AH = 0 is shown as follows 2. Cannot tell from information given C12H22011(s) + 12 02(8) - 3. AH > 0 12 CO2(g) + 11 H20(e) 4. AH