0. Graphite is thermodynamically less stable that diamond under standard conditions.1. True2. False1. Which statement would be the best interpretation of the First Law of Thermodynamics?1. The total amount of energy in the universe is increasing.2. The total amount of entropy in the universe is increasing.3. The total amount of energy in the universe is constant.4. The total amount of matter in the universe is constant.2. Enthalpy (H) is best defined by which of the following statements?1. the capacity of a system to influence the entropy of its surroundings2. pressure-volume work3. a measure of a system's energetic degeneracy4. none of these describe enthalpy3.1. Water changing from a solid to a liquid is1. an endothermic change.2. an exothermic change.3. Neither an exothermic or an endothermic change3.2. Heat flow is considered positive when heat flows (into, out of) a system; work isconsidered positive when work is done (by, on) a system.1. out of; by2. into; on3. out of; on4. into; by4. Definition: state functionsAn extensive state function's value is (dependent on/independent of) the amount of a givensubstance. An intensive state function's value is (dependent on/independent of) the amountof a given substance.1. dependent on, dependent on2. independent of, independent of3. dependent on, independent of4. independent of, dependent on5. What is the enthalpy change for ΔH°fC(s,graphite)?1. −1300 kJ/mol2. 31 kJ/mol3. 717 kJ/mol4. 0 kJ/mol5. −575 kJ/mol6. Consider the following specific heats: copper, 0.384 J/g·°C; lead, 0.159 J/g·°C;water,4.18J/g·°C; glass, 0.502 J/g·°C. If the sameamount of heat is added to identicalmasses of each of these substances, which substance attains the highest temperature?(Assume that they all have the same initial temperature.)1. lead2. water3. glass4. copper7.1. You set up a bomb calorimetry experiment using 1 liter of water as your heat sink andcombusting a 4.409 g sample of propane (C3H8). If the initial and final temperature are24.90 °C and 77.96 °C respectively, what is the approximate molar enthalpy of combustionof ethene? (Assume the calorimeter itself absorbs no heat. Assume the density of water is 1g·mL-1)1. −222.0 kJ · mol−12. −222, 000 kJ · mol−13. −22.20 kJ · mol−14. −22, 200 kJ · mol−15. −2, 220 kJ · mol−17.2. A 0.10 g piece of chocolate cake is combusted with oxygen in a bomb calorimeter. Thetemperature of 4,000 g of H2O in the calorimeter is raised by 0.32 K. (The specific heat ofthe water is 1.0 cal/g·K and the heat of vaporization of water is 540 cal/g.) What is ΔE forthe combustion of chocolate cake? Assume no heat is absorbed by the calorimeter.1. −460 kcal/g2. −532 kcal/g3. −13.3 kcal/g4. −12.8 kcal/g5. −3900 kcal/g8. Calculate the standard reaction enthalpy for the reaction of calcite with hydrochloric acid:CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(ℓ) + CO2(g)The standard enthalpies of formation are:for CaCl2(aq) : −877.1 kJ/mol;for H2O(ℓ) : −285.83 kJ/mol;for CO2(g) : −393.51 kJ/mol;for CaCO3(s) : −1206.9 kJ/mol;and for HCl(aq) : −167.16 kJ/mol.1. −72.7 kJ/mol2. −165 kJ/mol3. −38.2 kJ/mol4. −98.8 kJ/mol5. −15.2 kJ/mol6. −116 kJ/mol7. −215 kJ/mol9. Calculation: Hess’s Law and combined reaction enthalpiesCalculate the standard reaction enthalpy for the reaction:NO2(g) → NO(g) + O(g)Using:O2(g) → 2O(g) ΔH° = +498.4 kJ/mol3/2 O2(g) → O3(g) ΔH° = +142.7 kJ/molNO(g) + O3(g) → NO2(g) + O2(g) ΔH° = -200.0 kJ/mol1. +592 kJ/mol2. +555 kJ/mol3. +307 kJ/mol4. +355 kJ/mol5. +192 kJ/mol10.1. How much internal energy would be associated with the rotational motion of 1 mole ofCO2?1. RT2. 1/2 RT3. 3/2 RT4. 2 RT10.2. What would be the total vibrational energy of .0833 moles of cetane (C16H34),assuming cetane is non-linear?1. 72 RT2. 144 RT3. 12 RT4. 6 RT11. What energy change is associated with the reaction to obtain 1.00 mole of H2? Thebalanced equation is:2 H2O(g) → 2 H2(g) + O2(g)and the relevant bond energies are:H-H : 436 kJ/mol; H-O : 467 kJ/mol;O-O : 146 kJ/mol; O=O : 498 kJ/mol.1. +425 kJ2. +249 kJ3. −425 kJ4. +498 kJ5. -498 kJ6. −436 kJ12.1. 1.95 mol of an ideal gas at 300 K and 3.00 atm expands from 16 L to 28 L and a finalpressure of 1.20 atm in two steps:(1) the gas is cooled at constant volume until its pressure has fallen to 1.20 atm, and(2) it is heated and allowed to expand against a constant pressure of 1.20 atm until itsvolume reaches 28 L.Which of the following is CORRECT?1. w = −4.57 kJ for the overall process2. w = −6.03 kJ for the overall process3. w = −4.57 kJ for (1) and w = −1.46 kJ for (2)4. w = 0 for the overall process5. w = 0 for (1) and w = −1.46 kJ for (2)12.2. 0.500 mole of N2(g) reacts with 1.50 moles H2(g) to produce NH3(g):N2(g) + 3H2(g) → 2NH3(g)If this reaction is carried out in a system against a constant 0.75 atm pressure (i.e., apiston) at 0 °C, calculate the magnitude of the P V work.1. 2.27 × 103J2. 22.4 J3. 22.7 J4. 22.4 × 103J5. 4.54 × 103J13. Which of the following are not forms of internal energy?1. motion of molecules2. kinetic energy3. heat4. potential energy5. chemical bonds14. Which of the following statements concerning calorimetry is/are true?I) Bomb calorimeters hold the volume of the system constant.II) The calorimeter itself does not absorb heat.III) ΔH = q in a bomb calorimeter.1. I, II2. I only3. II only4. I, II, III5. I, III6. II, III7. III only15. A system did 150 kJ of work and its internal energy increased by 60 kJ. How muchenergy did the system gain or lose as heat?1. The system gained 60 kJ of energy as heat.2. The system gained 90 kJ of energy as heat.3. The system gained 210 kJ of energy as heat.4. The system lost 90 kJ of energy as heat.5. The systemlost 210 kJ of energy as heat.16.1. For the four chemical reactionsI) 3O2(g) → 2O3(g)II) 2H2O(g) → 2H2(g) + O2(g)III) H2O(g) → H2O(ℓ)IV) 2H2O(ℓ) + O2(g) → 2H2O2(ℓ)which one(s) is/are likely to exhibit a positive ΔS?1. All have a positive ΔS.2. I, III and IV only3. I and II only4. III and IV only5. II only16.2. When Δngasfor a reaction is large and positive ΔS for the reaction is likely to be(large/small) and (positive/negative).1. large, positive2. large, negative3. small, positive4. small, negative17. Which of the following would have the largestabsolute entropy?1. N2(g)2. N2(s)3. N2(aq) (nitrogen dissolved in water)4. N2(ℓ)18. Calculate the standard entropy of fusion of ethanol at its melting
View Full Document
Unlocking...