# topic12 - XII. Thermodynamics 1. CH4(g) + 2 O2(g) CO2(g) +...

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XII. Thermodynamics 1. CH 4(g) + 2 O 2(g) CO 2(g) + 2H 2 O (l) H o = -889.1 kJ H f o H 2 O (l) = -285.8 kJ H f o CO 2(g) = -393.3 kJ What is the standard heat of formation of methane, H f o CH 4(g) , as calculated from the data above? (A) -210.0 kJ/mole (B) –107.5 kJ/mole (C) –75.8 kJ/mole (D) 75.8 kJ/mole (E) 210.0 kJ/mole Answer: C 2. A cube of ice is added to some hot water in a rigid, insulated container, which is then sealed. There is no heat exchange with the surroundings. What has happened to the total energy and the total entropy when the system reaches equilibrium? Energy Entropy (A) Remains Constant Remains Constant (B) Remains Constant Decreases (C) Remains Constant Increases (D) Decreases Increases (E) Increases Decreases Answer: C 3. NH 3(g) + 2CH 4(g) + 5/2O 2(g) H 2 NCH 2 COOH (s) + 3H 2 O (l) At a constant temperature, H, the change in enthalpy for the reaction above is approximately equal to: (A) E-(11/2)RT (B) E-(7/2)RT (C) E+RT (D) E+(7/2)RT (E) E+(11/2)RT Answer: A 4. Which of the following is probably true for a solid solute with a highly endothermic heat of solution when dissolved in water? (A) The solid has a low lattice energy (B) As the solute dissolves, the temperature of the solution increases (C) The resulting solution is ideal

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## topic12 - XII. Thermodynamics 1. CH4(g) + 2 O2(g) CO2(g) +...

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