36. Consider a reaction with the following thermodynamic properties. AH = 77.7 kJ AS° = -35.7 J/(K • mol) AG°= 88.4 kJ This reaction: will be spontaneous at low temperatures. b. has bonds in the products that are weaker than the reactants. c. may have fewer and more complicated molecules in the product. d. will proceed very slowly. a.

36. Consider a reaction with the following thermodynamic properties. AH = 77.7 kJ AS° = -35.7 J/(K • mol) AG°= 88.4 kJ This reaction: will be spontaneous at low temperatures. b. has bonds in the products that are weaker than the reactants. c. may have fewer and more complicated molecules in the product. d. will proceed very slowly. a.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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5. Consider the combustion reaction of octane (C8H18, mol. wt. = 114.23 g/mol, density = 0.703 g/mL). a. Write out the balanced chemical equation for this reaction. All products are in the gas phase. 2 C8H18 + 25 O2 ---> 16 CO2 + 18 H2O b. Calculate the standard free energy (in kJ/mol) released in this reaction. ∆Hfo (kJ/mol) Sfo (J/K mol) Octane(l) ─208.4 463.7 H2O(g) ─242 189 02 0 205 CO2(g) ─393.5 214 c. Making the approximation that gasoline consists of 100% octane, how much energy would 1.00 gallon of gasoline release? (1 quart = 946 mL, 1 gallon = 4 quarts)
17. If the change in free energy, AG is negative, the reaction is spontaneous in the forward direction. It is more convenient to use change in enthalpy, AH, as a criterion of spontaneity than change in entropy, AS. A. both statements are true B. the 1st statement is false and the 2nd is true C. the 1st statement is true and the 2nd is false OD. both statements are false
For a given reaction, ΔH = +35.5 kJ/mol and ΔS = +83.6 J/mol·K. Which of the following is TRUE? a. The reaction is spontaneous at standard conditions. b. The reaction is spontaneous at T > 425 K. c. The reaction is spontaneous at all temperatures. d. The reaction is spontaneous at T < 425 K.
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Which of the following exhibits a non-spontaneous?a. Rain falls from the sky.b. A plants grows into a tree.c. A fruit rots after several days.d. A cellphone battery is being recharged.
The standard molar Gibbs free energy of formation for oxygen gas is: A. −15 kJ mol−1 B. 0 kJ mol−1 C. much larger than ΔfG° of hydrogen gas D. much less than ΔfG° of elemental uranium E. equal to ΔfG° of elemental tungsten F. Both C. and D. G. Both B. and E.
If the ΔG'° of the reaction A → B is –40 kJ/mol, under standard conditions the reaction: a. is at equilibrium. b. will never reach equilibrium. c. will not occur spontaneously. d. will proceed at a rapid rate. e. will proceed spontaneously from left to right.
When a system is at equilibrium, __________ a. the forward process is spontaneous but the reverse process is not b. the reverse process is spontaneous but the forward process is not c. both forward and reverse processes have stopped d. the forward and the reverse processes are both spontaneous e. the process is not spontaneous in either direction
Multiple Choice 1. This overall reaction is best described as being: a. exothermic b. endothermic c. endergonic d. exergonic e. spontaneous in the forward direction a. -35800 kJ/mol b. 173.4 kJ/mol c. 35800 kJ/mol d. 101.7 kJ/mol e. -274.2 kJ/mol a. +0.46 V b. +0.617 V c. +1.39 V d. -0.46 V e. +1.21 V G a. 147 g Al b. 0.606 g Al c. 4.55 × 10-3 g Al Reactants 2. At 298 K, AH° for the following reaction is -137.5 kJ/mol, and AS° is +120.5 J/K. Calculate the value of AG° for this reaction at 298 K. C2H4 (g) + H2 (g) C2H6 (g) d. 16.4 g Al e. 49.1 g Al X Reactants 2Fe2+ (aq) + Sn4+ (aq) Products 3. Use the Table to calculate the standard cell potential (Eºcell) for the voltaic cell based on the reaction below. Sn2+ (aq) + 2Fe3+, (aq) Reaction progress Products Half-reaction Cr³+ (aq) + 3e- Fe2+ (aq) + 2e- Fe3+ (aq) + e- → Sn4+ (aq) + 2e- → → Cr (s) Fe (s) Fe2+ (s) Sn²+ (aq) 4. How many grams of aluminum metal are produced in the electrolysis of molten AIC13 for 3.25 br with an electrical…