A mixture of hydrogen and nitrogen are allowed to come to equilibrium at a

A mixture of hydrogen and nitrogen are allowed to

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43. A mixture of hydrogen and nitrogen are allowed to come to equilibrium at a specific temperature according to the reaction3 H2+ N2<===> 2 NH2Analysis of the equilibrium mixture shows that it contains 1.5 mol NH3, 2.0 mol N2, and 3.0 mol H2. How many mols of H2were present at the beginning of the reaction?(A) 3.0(B) 4.0(C) 4.5(D) 5.344. If the temperature is raised in an equilibrium system containing H2, N2and NH3, it is found that the equilibrium constant for the formation of NH3decreases. This indicates that the synthesis of ammonia from its elements45. Bleaching powder reacts with iodide ion according to the following unbalanced equation:OCl¯ + I¯ + H+<===> I2+ Cl¯ + H2OA 0.6000 g sample of bleaching powder requires 35.24 mL of 0.1084 N Na2S2O3to titrate the liberated iodine. The percentage of Cl in the sample is46. The balanced oxidaton-reduction reaction for the followingequationHg2+(aq) + H2S(aq) ---> Hg°(s) + S8(s) (acid solution)would be47. The balanced equation for the reduction of the nitrate anion by the Fe(II) ion in an acidic solution is(A) 3 Fe2+(aq) + NO3¯(aq) + 4 H+(aq) ---> 3 Fe3+(aq) + NO(g) + 2 H2O(l)
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(B) Fe2+(aq) + NO3¯(aq) + 8 H+(aq) ---> Fe3+(aq) + NO(g) + 4 H2O(l)(C) 2 Fe2+(aq) + 2 NO3¯(aq) + 4 H+(aq) ---> 2 Fe3+(aq) + 2 NO(g) + 4 H2O(l)(D) 3 Fe3+(aq) + NO(g) + 2 H2O(l) ---> 3 Fe3+(aq) + NO3¯(aq) + 4 H+(aq)48. Given the following half-reactions:A2++ e¯ ---> A+E° = +1.70 VB4++ 2e¯ ---> B2+E° = +0.60 VC3++ e¯ ---> C2+E° = +0.90 VThe only reaction that could be used in a titration would be49. During a potentiometric oxidation-reduction titration, the only place at which the Ecellequals the E° of the substance being titrated is50. Given the following standard half reaction Standard Electrode Potentials:Cd2++ 2e¯ ---> CdE° = -0.40 VAg++ e¯ ---> AgE° = +0.80 VThe balanced spontaneous reaction involving silver and cadmium species would be
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  • Spring '13
  • Comstock
  • Atom, Reaction, Vapor pressure, Sulfuric acid, (aq)

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