Macmillan LearningThe temperature-dependent form of the extended Debye-Hückel equation is(-1.825 x 106) (ET) z² √log (y) =1+2.00√ETwhere y is the activity coefficient, e is the dielectric constant of water (a unitless quantity), T is the temperature (in Kevin), z isthe charge of the ion, μ is the ionic strength (in moles per liter), and a is the ion size parameter (in picometers). Thetemperature-dependence of the dielectric constant is given by the equatione = 79.755e-4.6x10-³)(T-293.15)where the temperature is in Kelvin. What is the value of the activity coefficient of Pb2+ at 65.00 °C when the ionic strength is0.036 M?Y =0.3935Incorrect

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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

Chapter18: Electrochemistry

Section: Chapter Questions

Problem 3RQ: Table 17-1 lists common half-reactions along with the standard reduction potential associated with...

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how did they arrive with the answer HCI (g) 5 H* (aq) + Cl- (aq) ΔG ΔΗ-TAS = (-75.15 x 103 Jmol-1) – (298.15 K) (-131.5 JK-1mol-1) AG° = - 35.94 kJ mol-1
a.) Slove for the Gibbs energy of formation for a generic compound AB2 in kJ/mol given the following thermodynamic data. ΔfH∘kJ/mol Sf∘ J/mol K A(l) 0 75 B2(g) 0 220 AB2(s) -200 140 b. According the result from a, will the formation of AB2(s) occur under standard state conditions? Why or why not?
18. From the following reacțions and thermal data at 25°C 3 2 Fe(s) +O:(g) 2 Fe,O:(s) ΔΗ - 196,500 cal %3D 1 2 FeO(s) + ; 0:(g) - Fe2O:(s) AH° = -67,900 cal Fe(s) + 2 H* (a = 1) = Fe++ (a = 1) + H2(g) AH° = -21,000 cal %3D %3D 1 H:(g) H* (a = 1) AHº = 0 cal %3D Hig) +0:(g) = H;0(1) AH° = -68,320 cal %3D calculate AH° of the reaction: FeO(s) + 2 H+ (a = 1) = H;0(1) + Fe++ (a = 1) %3D
J R = 8.314 mol·K F = 96,485 mol AG = AG° + RT · In(Q) ΔΕ ΔΕ-). In(Q) Half Reaction (Note: All given as reduction) E° (V) 02 (g) + 4 H"(aq) + 4 e 2 H20 (1) 1.229 |Z2 (s) + 2 e → 2Z° (aq) 0.426 3+ (aq) + 3 е A' → A (s) 0.292 2 H20 (I) + 2 e H2 (g) + 2 OH¯ (aq) - 0.828 G2+ (aq) + 2 e G (s) - 1.245 (aq) + 2 e¯ → M (s) - 1.893 Using a U-tube, a student sets up a non-spontaneous electrochemical cell with a battery connected to two carbon electrodes that are submerged in 1 MMZ2 (aq) solution (M is a metal and Z is an anion composed of the newly discovered element Z). Use the reference information given in the table above to answer the following three questions. Question 11 The electrode connected to the red wire (negative terminal on the battery) will... o produce bubbles and the pH will increase. o produce M (s) on the electrode and the pH will not change. o produce bubbles and the pH will decrease. o produce M (s) on the electrode and the pH will decrease. Question 12 The electrode…
The standard Gibbs energy of formation of NH3(g) at 298 K is ─16.6 kJ mol-1. Based on this data, calculate (a) the standard Gibbs energy of reaction and (b) the pressure equilibrium concentration for the reaction N2(g) + 3 H2(g) = 2 NH3(g) Answer:[-33.2; 6.6 x 105 ]
(1) Calculate AG for the following reactions at the stated temperatures: (a) ZnO(s) + C(s) Zn(s) + CO(g) at 298 K, when AH08 +238.6 kJ mol; AS = +213 J K mol. (b) ZnO(s) + C(s) Zn(g) + CO(g) at 1373 K, when An = +349.9 kJ mol; AS3 = +285 J K- mol. (c) Fe(s) + 0,(8) FeO(s) at 298 K, when AH298 = -265.4 kJ mol; ASOR = -71 J K mol.
6. Calculate the AG for the following reaction at 25 C: (a) N2(g) + O2(g) 2NO(g) (b) H2O1) H2O(g) (c) 2C2H2(9) + 502(g) 4CO2(g) + 2H2Ou) |
Physical Chem #4
Me 03, -78 °C then Zn, CH;CO2H
Gibbs free energy (G) is a measure of the spontaneity of a chemical reaction. It is the chemical potential for a reaction, and is minimized at equilibrium. It is defined as G=H-TS where H is enthalpy, T is temperature, and S is entropy. The chemical reaction that causes iron to corrode in air is given by 4Fe +302-2Fe2O3 in which at 298 K, AH = - 1684 kJ and ASixn - 543.7 J/K. = Part C At what temperature Teq do the forward and reverse corrosion reactions occur in equilibrium? Express your answer as an integer and include the appropriate units. ► View Available Hint(s) Teq = Submit 14 μÅ Value Units ?
Q1: In argon gas, the interaction between two Ar atoms, separated by a distance r, can be very well described by the Lennard-Jones (LJ) potential energy: o12 V (r) = 4€ r12 76 The parameters o and e determine the shape and the strength of the potential. For argon, o = 0.34 nm and e = 120kg K (where kg is the Boltzmann constant). (a) Is the LJ interaction given above attractive or repulsive? What happens if two Ar atoms are brought very close to each other? What if they are far from each other? (b) Based on your answer in the previous part, describe the general motion of two Ar atoms brought close to each other and allowed to move from rest. (c) Does the LJ potential allow for equilibrium separation between two Ar atoms? If so, is it stable or unstable separation? (d) Based on your answers in the previous parts, determine the "spring constant" (in N/m) related to the LJ potential.
What is the value of pk, for the fluoride anion, F at 25°C? Ka(HF) = 7.1 x 10-4? Express your answer in decimal notation rounded to three significant figures.

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