Given the standard reduction potentials Cr 3 3e Cr 074 V Pb 2 2e Pb 013 V what

Given the standard reduction potentials cr 3 3e cr

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47. Given the standard reduction potentials, Cr3++ 3e¯ ---> Cr -0.74 V Pb2++ 2e¯ ---> Pb -0.13 V what is the standard potential, E°, for the following reaction? 2 Cr + 3 Pb2+---> 2 Cr3++ 3 Pb (A) 0.61 V (B) 0.87 V (C) 1.09 V (D) 1.87 V 48. A mixture of 0.10 mol H2and 0.050 mol O2are placed in a bomb calorimeter with a heat capacity of 5.1 x 104J °C¯1. The initial temperature is 25.00 °C and the temperature after combustion is 25.56 °C. What is the ffor H2O(l)? (Assume 100% conversion to water.) 49. In the reaction
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2MnO4¯ + 16H++ 10Br¯ ---> 2Mn2++ 8H2O + 5Br2Br¯ ion is the 50. For BrF3, the orbital geometry of the central atom and the molecular geometry are, respectively, 51. How many electrons are needed to convert one nitrate ion into one ammonia molecule? (A) 3 (B) 5 (C) 6 (D) 8 52. Which species below violates the octet rule? 53. What is the coefficient for H2O when the redox equation Cu + NO3¯ + H+---> Cu2++ NO + H2O is balanced using smallest whole - number coefficients? 54. Which change will produce an increase in the entropy of a system?
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55. Which will cause the value of the equilibrium constant for this reaction to increase? 2A(g) + B(g) ---> C(g); H° = 280 kJ (A) adding a catalyst (B) increasing the concentration of A (C) increasing the concentration of C (D) increasing the temperature 56. Given 2CO(g) + O2(g) ---> 2CO2(g); G° = -516 kJ 4MnO(s) + O2(g) ---> 2Mn2O3(s); G° = -312 kJ Calculate the value of G° for 2MnO(s) + CO2(g) ---> Mn2O3(s) + CO(g) (A) +102 kJ (B) -102 kJ (C) +204 kJ (D) -204 kJ 57. Given Br2(l) S° = 152.2 J mol¯11and f= 0 kJ mol¯1Br2(g) S° = 245.4 J mol¯11and f= 30.9 kJ mol¯1Calculate the boiling point of liquid bromine. (A) 58.4 K (B) 332 K (C) 125 K (D) -147 K 58. Which is not expected to have a value of zero?
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59. The half-life of 14C is 5570 years. How many years will it take for 90% of a sample to decompose?
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  • Spring '08
  • rogers
  • Reaction, kJ mol¯1

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