Gen Chem II Exam I practice problems sp07

Gen Chem II Exam I practice problems sp07 - 1 General...

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Unformatted text preview: 1 General Chemistry II Exam 1 Practice Problems Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. How much heat is released when 75 g of octane is burned completely if the enthalpy of combustion is -5,500 kJ/mol C 8 H 18 ? C 8 H 18 + 25/2 O 2 8CO 2 + 9H 2 O a. 7200 kJ b. 8360 kJ c. 4.1 10 5 kJ d. 3600 kJ e. 5500 kJ ____ 2. Calculate the amount of heat released in the complete combustion of 8.17 grams of Al to form Al 2 O 3 (s) at 25 C and 1 atm. H for Al 2 O 3 (s) = 1676 kJ/mol 4Al(s) + 3O 2 (g) 2Al 2 O 3 (s) a. 254 kJ b. 203 kJ c. 127 kJ d. 237 kJ e. 101 kJ ____ 3. Given the following at 25 C and 1.00 atm: H 0 1/2N 2 (g) + O 2 (g) NO 2 (g) 33.2 kJ N 2 (g) + 2O 2 (g) N 2 O 4 (g) 11.1 kJ Calculate the H for the reaction below at 25 C. 2NO 2 (g) N 2 O 4 (g) a. +11.0 kJ b. +44.3 kJ c. +55.3 kJ d. -22.1 kJ e. -55.3 kJ ____ 4. Calculate H for the following reaction at 25.0 C. Fe 3 O 4 (s) + CO(g) 3FeO(s) + CO 2 (g) H (kJ/mol) -1118 -110.5 -272 -393.5 a. -263 kJ b. 54 kJ c. 19 kJ d. -50 kJ e. 109 kJ 2 ____ 5. How much heat is released when 6.38 grams of Ag(s) reacts by the equation shown below at standard state conditions? 4Ag(s) + 2H 2 S(g) + O 2 (g) 2Ag 2 S(s) + 2H 2 O(l) Substance Ag(s) 0 H 2 S(g) -20.6 O 2 (g) 0 Ag 2 S(s) -32.6 H 2 O(l) -285.8 a. 8.80 kJ b. 69.9 kJ c. 22.1 kJ d. 90.8 kJ e. 40.5 kJ ____ 6. Evaluate H for the following reaction from the given bond energies. 2HBr(g) H 2 (g) + Br 2 (g) H H-H = 436 kJ/mol, H Br-Br = 193 kJ/mol, H H-Br = 366 kJ/mol a. -103 kJ b. -143 kJ c. +103 kJ d. +142 kJ e. 259 kJ ____ 7. A 0.900-g sample of toluene, C 7 H 8 , was completely burned in a bomb calorimeter containing 4560. g of water which increased in temperature from 23.800 C to 25.718 C. What is E for the reaction in kJ/mol C...
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Gen Chem II Exam I practice problems sp07 - 1 General...

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