1412FINALSAMPLE-KEY.pdfPlease help solve and show your work/give explanation for the following questions. Thank you.1. Given the following mechanism, determine which of the species below is a catalyst? a) C + ClO2 --> ClO + CO b) ClO + O2 --> ClO2 + O c) CO + ClO2 --> CO2 + ClO d) ClO + O --> ClO22. For the system CaO(s) + CO2(g) --> CaCO3(s) the equilibrium constant expression for Keq is 1412FINALSAMPLE-KEY.pdf A) [CO2] B) 1 / [CO2] C) [CaO] [CO2] / [CaCO3] D) [CaCO3] / [CaO] [CO2] 3. The value of Kp for the reaction 2NO2(g) --> N2O4(g) is 1.52 at 319 K. What is the value of Kp at this temperature for the reaction N2O4(g) --> 2NO2(g)?1412FINALSAMPLE-KEY.pdf A) -1.52 B) 1.23 C) 5.74 x 10-4 D) 0.658 4. Which of the following is true for the cell shown here? Zn(s) |Zn2+(aq) ||Cr3+(aq) |Cr(s) A. the electrons flow from cathode to the anode B. the electrons flow from the zinc to the chromium C. the electrons flow from the chromium to the zinc D. the zinc is reduced5. Calculate the pH of a buffer that is 0.20 M in formic acid and 0.15 M in sodium formate (Ka = 1.8 x 10-4). A) 2.4 x 10-4 B) 3.63 C) 0.82 D) 8.336. If X is the solubility of a salt in moles per liter, which one of the following Ksp expressions is incorrect? A) Ag2S, Ksp = 4X3 B) AgCl , Ksp = X2 C) BaSO4 , Ksp = 4 X2 D) Cu(OH)2 , Ksp = 4X37. For each of the following processes, predict whether entropy, delta S, is positive or negative: (i) 2K(s) + Br2(l) --> 2KBr(s), ii) 2MnO2(s) --> 2MnO(s) + O2(g)1412FINALSAMPLE-KEY.pdfA. (i) positive, (ii) positive B. (i) negative, (ii) positive C. (i) positive, (ii) negative D. (i) negative, (ii) negative8. Using the given values of S° ( J/mol.K) , calculate the value of delta S° for the reaction, C2H4(g) + H2(g) --> C2H6(g) S0 = 219.4 130.58 229.5 A) -120.5 J/K B) 120.5 J/K C) 10.1 J/K D) -10.1 J/K 9. Consider a galvanic cell based on the reaction below, what is the coefficient of Fe3+ in the balanced equation in acidic solution? Fe2+ + Cr2O72- --> Fe3+ + Cr3+ A) 1 B) 2 C) 3 D) 6 10. The standard reduction potentials for the following half reactions are given as follows; Cr3+ + 3e- --> Cr(s) E0 = -0.73 V Br2 + 2e- --> 2Br- E0 = +1.09 V What is the E0 for a voltaic cell using these reactions? A) 1.82 V B) 0.36 V C) 4.75 V D) 1.79 V
This question was answered on: May 23, 2022
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