# ch18 - Chapter 18 Thermodynamics Multiple Choice Section...

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Chapter 18 Thermodynamics Multiple Choice Section 18.1 1. The mathematical equation which expresses the first law of thermodynamics is a. H = E + p V b. H = E - p V c. H = q + w * d. E = q + w e. H = q + E Section 18.1 2. The standard enthalpy of reaction, H ° rxn for C 2 H 2 ( g ) + 2 H 2 ( g ) C 2 H 6 ( g ) is -311.5 kJ mol -1 . Determine the value of E ° rxn for this reaction. * a. -306.5 kJ mol -1 b. -309.0 kJ mol -1 c. -314.0 kJ mol -1 d. -316.46 kJ mol -1 e. +4646 kJ mol -1 Section 18.1 3. The standard enthalpy of reaction, H ° at 25 C ° NH 3 ( g ) + HCl( g ) NH 4 Cl( s ) is -175.9 kJ mol -1 . Determine the value of E ° rxn for this reaction. a. -164.8 kJ mol -1 * b. -170.9 kJ mol -1 c. -173.4 kJ mol -1 d. -180.9 kJ mol -1 e. +5134 kJ mol -1 Section 18.1 4. The standard enthalpy of reaction, H ° rxn , for the reaction, C 4 H 10 ( g ) + 13/2 O 2 ( g ) 4 CO 2 ( g ) + 5 H 2 O( l ) is -2877 kJ mol -1 . Determine the value of E ° rxn for this reaction. * a. -2868 kJ mol -1 b. -2871 kJ mol -1 c. -2880 kJ mol -1 d. -2886 kJ mol -1 e. +2886 kJ mol -1 126

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Section 18.1 5. The standard enthalpy of reaction, H ° rxn , for the reaction, CaO( s ) + SO 3 ( g ) CaSO 4 ( s ) is -401.5 kJ mol -1 . Determine the value of E ° rxn for this reaction. a. -362.2 kJ mol -1 * b. -399.0 kJ mol -1 c. -404.0 kJ mol -1 d. -2880 kJ mol -1 e. +2077 kJ mol -1 Section 18.2 6. Which statement is true? a. Spontaneous changes are always accompanied by an increase in the entropy of the system. b. Spontaneous changes are always accompanied by a decrease in the entropy of the system. c. Spontaneous changes are always accompanied by an increase in the enthalpy of the sys- tem. d. Spontaneous changes are always accompanied by a decrease in the enthalpy of the system. * e. Most highly exothermic chemical reactions are also spontaneous chemical reactions. Section 18.3 7. Which process is accompanied by an increase in entropy? a. setting up a stack of dominos b. setting up decorations on a Christmas tree c. filing correspondence in file folders and placing them in hanging file folders * d. dropping a glass pane on the front walk of your residence e. restocking a canned goods shelf display in a supermarket Section 18.3 8. Which reaction is accompanied by an increase in entropy? a. ZnS( s ) + 3/2 O 2 ( g ) ZnO( s ) + SO 2 ( g ) * b. CH 4 ( g ) + H 2 O( g ) CO( g ) + 3H 2 ( g ) c. BaO( s ) + CO 2 ( g ) BaCO 3 ( s ) d. Na 2 CO 3 ( s ) + CO 2 ( g ) + H 2 O( g ) 2 NaHCO 3 ( s ) e. N 2 ( g ) + 3 H 2 ( g ) 2 NH 3 ( g ) Section 18.3 9. Which reaction is accompanied by an increase in entropy? a. 2 H( g ) H 2 ( g ) b. NiCl 2 ( s ) + 6 NH 3 ( g ) NiCl 2 6NH 3 ( s ) * c. I 2 ( g ) 2 I( g ) d. ZnO( s ) + CO 2 ( g ) ZnCO 3 ( s ) e. C 2 H 4 ( g ) + Cl 2 ( g ) C 2 H 4 Cl 2 ( l ) 127
Section 18.3 10. Which reaction is accompanied by an increase in entropy? a. C

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ch18 - Chapter 18 Thermodynamics Multiple Choice Section...

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