5) The following example illustrates an ammonia synthesis process in which an inert gas (I) is present, necessitating a purge stream. The fresh feed to the process contains nitrogen and hydrogen, as well as an inert gas (I). The feed is combined with a recycle stream containing the same three species, and the combined stream is fed to a reactor. The reactor effluent flows to a condenser. A liquid stream containing all of the ammonia formed in the reactor and a gas stream containing all the inerts and the unreacted nitrogen and hydrogen leave the condenser. The gas stream is split into two fractions with the same composition: one is removed from the process as a purge stream, and the other is the recycle stream, which is subsequently combined with the fresh feed. In every stream containing nitrogen and hydrogen, the two species are in stoichiometric proportion. Let yI0 be the mole fraction of inerts in the fresh feed, f the single-pass conversion of nitrogen in the reactor, and p the fraction of the gas leaving the condenser that is purged (mol purged/mol total). Draw and fully label a process flowchart, and using stoichiometric ratios, physical constraints and simple material balances in your head, try to introduce the fewest possible variables. In other words express as many quantities as possible in terms of yI0, f and p. Given yI0 = 0.01, f = 0.20, and p = 0.10, chose a basis anywhere in the problem and solve for the total moles fed to the reactor (nr), moles of ammonia produced (np), and overall nitrogen conversion (fov).
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Calculate the solubility (a) in mol/L and (b) in g/L of AgCl in 2.0 M NH3(aq). What is the concentration of Ag+ in this solution? (Ksp = 1.6 x 10-10; Kf = 1.7 x 107 for Ag(NH3)2+
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Calculate the pH at the equivalence point in titrating 0.011 M solutions of each of the following with 0.054 M NaOH.
(a) hydrobromic acid (HBr)
(b) phenol (HC6H5O), Ka = 1.3e-10
(c) hypoiodous acid (HIO), Ka = 2.3e-11
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A solution that may contain Cu2+, Bi3+, Sn4+, or Sb3+ ions is treated with thioacetamide in an acid medium. The black precipitate that forms is partly soluble in strongly alkaline solution. The precipitate that remains is soluble in 6 M HNO3 and gives only a blue solution on treatment with excess NH3. THe alkaline solution, when acidified, produces, an orange precipitate. On the basis of this information, which ions are present, which are absent, and which are still in doubt?
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Can anyone explain the complete mechanism for preparation of amines via gabriel synthesis starting with phthalimide?
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10. A mixture of 0.08729 mol of H2O, 0.1041 mol of CH4, 0.08069 mol of CO, and 0.1098 mol of H2 is placed in a 1.0-L steel pressure vessel at 1034 K. The following equilibrium is established:
1 H2O(g) + 1 CH4(g) 1 CO(g) + 3 H2(g)
At equilibrium 0.06283 mol of CO is found in the reaction mixture.
(a) Calculate the equilibrium partial pressures of H2O, CH4, CO, and H2.
Peq(H2O) = ____ .
Peq(CH4) = ____ .
Peq(CO) = ____ .
Peq(H2) = ____ .
(b) Calculate KP for this reaction.
KP = ____ .
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balance the redox reaction
NO2- + MnO4- + H+ -------> NO3- + Mn2+ + H2O
show work please
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14. From the half-reactions below, calculate the solubility product of Mg(OH)2.
Mg2+ + 2e º Mg(s) E° = -2.360 V
Mg(OH)2(s) + 2e º Mg(s) + 2OH- E° = -2.690 V
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how would the polarizability change in magnitude if we raise the temperature of xenon to above its boiling point? why?
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1. Describe an ELISA procedure that you would use to determine if a person was infected with the human immunodeficiency virus, the causative factor of AIDS.
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In the reaction shown below, what species is oxidized? 2NaI + Br2 → 2NaBr + I2
A) I–
B) I2
C) Br2
D) Na+
E) Br–
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Estimate the heat of vaporization of diethyl ether at its normal boiling point using Trouton’s rule and Chen’s rule and compare the results with a tabulated value of this quantity. Calculate the percentage error that results from using each estimation. Then estimate ΔH^v at 100°C using Watson’s correlation.
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19. Why are receptors and substrates sometimes explained in terms of locks and keys?
26. Why is a drug
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what is the percentage of the R enantiomer in a sample of Carvone that has a specific rotation of 30, given that the specific rotation of (R)- CARVONE IS -61
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Why should we boil water and shake the solution in the volumetric determination of alkalinity of soda ash?
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