The diffusion coefficients for iron in nickel are given at two temperatures: T (K) D (m'ls) 1273 9.4 x 10-16 1473 2.4 x 10-14 (a) Determine the values of Do and the activation energy Qd (b) What is the magnitude of D at 1100°C (1373 K)?
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- QUESTION: 5 Assume that in an n-type Gallium Arsenide semiconductor at 300K, the electron concentration varies linearly from 1 x 1018 cm-3 to 7 x 1017 cm3 over a distance of 0.01cm. Determine the diffusion current density if the electron diffusion co-efficient is Dn =225cm2/sDetermine the activation energy for the redox reaction Q²⁺ + 2 R³⁺ → Q⁴⁺ + 2 R²⁺. Problem Table Rate Constant Temperature 3.12 x 10³ M⁻¹s⁻¹ 275 K 2.70 x 10⁴ M⁻¹s⁻¹ 300 KWhich one of the following reactions will occur spontancously at standard-state conditions and 25"C? O 2AI3+ + 3Fe - 2Al + 3Fe2+ O Mg+ + Ca - Mg + Ca? O Ni?+ +2Fe?*(aq) Ni(s) + 2Fe"(aq) + Au + 3K Cu+ + H2 O Au + 3K*+ O Cu + 2H-
- How much time is needed to deposit 1.0 g of chromiummetal from an aqueous solution of CrCl3 using a currentof 1.5 A?(a) 3.8 x10-2 s (b) 21 min (c) 62 min (d) 139 min(e) 3.2 x103 min(24) The gold-plating of a ceramic figurine requires a total of 2.78 g of solid gold. If the current being used is 12.7 amperes, how many minutes will it take to plate the gold figurine? You may assume that there is sufficient concentration of gold cation to complete the process. (A) 1.79 (B) 1056 (C) 5.36 VELG 14 (D) 68.1 (E) 4.57 8Which of the following reactions has (+)work? (a) Ni(CO)4(g) ➜ Ni(s) + 4CO(g) (b) C6H6(l) ➜ C6H6(g) (c) SiO2(s) + 3C(s) ➜ SiC(s) + 2CO(g) (d) 2SO2(g) + O2(g) ➜ 2SO3(g)
- .A plot of a Langmuir adsorption isotherm (C/q vs 1/Q) for an adsorption process, gives a slope of 0.208 and intercept of 250. Calculate the adsorption capacity at equilibrium corresponding to monolayer coverage (0) A) 0.002 B) 4.8 C) 52 D) 1.2 x 10¹Page of 9 ZOOM 11. The reaction between selenous acid and the iodide ion in acid solution is H,SeO3(aq) + 61 (aq) + 4H (aq) – Se(s) + 21; (aq) +3H,O(1) The data in the following table were measured at 0°C. Experiment [H2SEO3]o (M) [H ]o (M) [I ]o (M) Initial Rate [mol/(L s)] 1 1.00 x 10 2.00 x 10 3.00 x 10 5.30 x 10 3.00 x 10 3.00 x 10 2 2.00 x 10 * 2.00 x 10 1.06 x 10 す 3.00 x 10 4.00 x 10 6.36 x 10-6 8.00 x 10 8.00 x 10 2.54 x 10-5 2.04 x 10 3.00x10 3.00 x 10 -2 3.00 × 10 6.00 x 10 6. 8.48 x 10 2.00 x 10 What is the rate constant for this reaction? 2.00 × 10 6.00 x 10 a. 1.5 × 10 L (mol- s) b. 1.5 × 101º L/(moľ - s) c. 4.9 x 10° L/(mol s) d. 294 L(moľ - s) e. 8.8 L/(mol -s) X 80°FSubmit Answer R F A student determines the value of the equilibrium constant to be 2.48x10-25 for the following reaction. CH4(9) + H₂O(g) 3H₂(g) + CO(g) Based on this value of Keg: AG for this reaction is expected to be (greater, less) Calculate the free energy change for the reaction of 1.56 moles of CH4(g) at standard conditions at 298K. AGOrxn= kJ 999 5 T Scholarship Ameri... bio 1108 chat [Review Topics] [References] Use the References to access important values if needed for this question. B Acd... Have Changes in... N Retry Entire Group 9 more group attempts remaining Cengage Learning Cengage Technical Support & 7 8 1 than zero. K P Previous SAVAGE X FEM Next Save and Exit A
- Guided Problem 4 An electrical current of 3.0 A is used to deposit 0.5 g of nickel to a metal object, with Ni being reduced from the +2 oxidation state. [NI = 58.69 g/mol] (aq i +2eNCalculate the Ksp for Ni(OH)2 Ni(OH)2(s) + 2 e- ⟶ Ni(s) + 2OH-(aq); Eo = -0.720 VNi2+(aq) + 2 e- ⟶ Ni(s); Eo = -0.250 V 7.56x1015 1.15x10-8 1.70x10-33 1.32x10-16First order: [A]o In———- = kt [A]t t1/2= .693/k