When the following reaction is at equilbrlum, which of these relationships is always true? 203lg) - 302(9) Multiple Choice O Kdo22 = [03 O 1032-1023 O 103l-(02) O Kdoa? - 102
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- Calculate ΔrG° for the following reaction at 387 K. HCN(g) + 2H2(g) → CH3NH2(g) ΔrH°= -158.0kJmol-1; ΔrS°= -219.9JK-1 mol-1Consider this scenario and answer the following questions: Chlorine atoms resulting from decomposition of chlorofluoromethanes, such as CCl2F2, catalyze the decomposition of ozone in the atmosphere. One simplifiedmechanism for the decomposition is:O3 ⎯⎯⎯⎯⎯⎯⎯→ sunlight O2 + OO3 + Cl ⟶ O2 + ClOClO + O ⟶ Cl + O2(a) Explain why chlorine atoms are catalysts in the gas-phase transformation: 2O3 ⟶ 3O2(b) Nitric oxide is also involved in the decomposition of ozone by the mechanism:O3 ⎯⎯⎯⎯⎯⎯⎯→ sunlight O2 + OO3 + NO ⟶ NO2 + O2NO2 + O ⟶ NO + O2Is NO a catalyst for the decomposition? Explain your answer.Prof. Neiman and Prof. James were first to discovered in 1973 that chlorofluorocarbons (CFCs) were depleting the Earth’sozone layer when released into the atmosphere. Once they reach the stratosphere, Clis released from the CFCs molecules by interaction with UV light. Free Cl atoms areable to react with ozone in a catalytic cycle that converts O3into the more stable O2.It is estimated that a single Cl atom is able to react with∼100000 O3molecules.Although CFCs production was banned in 1996, there are still a substantial numberof motor vehicle air conditioners (MVACs) that use CFC-12 (CF2Cl2) as refrigerant.The average CFC-12 emission rate from operating MVACs has been estimated tobe 59.5 mg per hour per vehicle (Zhang et al.Environ. Sci. Technol. Lett.2017).How much chlorine, in kg, is added to the atmosphere in a year due to 100 millionMVACs using CFC-12 as refrigerant?
- The value of ΔS° for the catalytic hydrogenation of acetylene to ethane, C2H2 (g) + 2H2 (g) → C2H6 (g) is __________ J/K∙ mol. A) -76.0 B) +440.9 C) -232.5 D) +232.5 E) +28.7For the reaction 5Ce4+ + Mn 2+ + 4H2 O → 5Ce3+ + MnO4- + 8H+ , given E0 (Ce4+ /Ce3+ ) = 1.70V,E0 (MnO4- /Mn2+ ) = 1.507V, calculate ΔG0 for this reaction ?Write the expression for Kc for the following reactions. Ineach case indicate whether the reaction is homogeneousor heterogeneous.(a) 3 NO1g2 ∆ N2O1g2 + NO21g2(b) CH41g2 + 2 H2S1g2 ∆ CS21g2 + 4 H21g2(c) Ni1CO241g2 ∆ Ni1s2 + 4 CO1g2(d) HF1aq2 ∆ H+1aq2 + F-1aq2(e) 2 Ag1s2 + Zn2+1aq2 ∆ 2 Ag+1aq2 + Zn1s2(f) H2O1l2 ∆ H+1aq2 + OH-1aq2(g) 2 H2O1l2 ∆ 2 H+1aq2 + 2 OH-1aq2
- For the arrhenius equation what are the other deviations for the formula like the ones i have to solve for t1 and k1.The vapor-liquid reactive equilibria for ethyl lactate synthesis follows the expressionlog K = 7.893 – (2.4312 x 103)K/Tbetween 83.12 °C and 101.54 °C. What are the ΔH°rxn, ΔG°rxn, and ΔS°rxn at 85 °C?Ind. Eng. Chem. Res. 2008, 47, 5, 1453–1463What process of catalysis is 2SO2(g) + O2(g) → 2SO3(g) with V2O5 called?
- Which of the following is a concerted reaction with a ΔG < 0? (Hint: Exergonic reaction)One of the many remarkable enzymes in the human bodyis carbonic anhydrase, which catalyzes the interconversionof carbon dioxide and water with bicarbonate ionand protons. If it were not for this enzyme, the body couldnot rid itself rapidly enough of the CO2 accumulated bycell metabolism. The enzyme catalyzes the dehydration(release to air) of up to 107 CO2 molecules per second.Which components of this description correspond to theterms enzyme, substrate, and turnover number?Calculate the rate of methane oxidation by OH (in units molecules cm-3 s-1) using the k at T=298 and pressure = 1 atm = 2.4x1019 molecules cm-3. What type of reaction is this? Assume: [OH] = 1 x 106 molecule cm-3 at all altitudes CH4 mixing ratio = 1.8 ppm (parts per million) = 1.8 umol mol-1 at all altitudes Use the Arrhenius expression k=A e-(Ea/RT) where k is the rate constant, Ea is activation energy, R is the gas constant (in appropriate units), and T is temperature in Kelvin. Arrhenius parameters for the reaction of OH with CH4: -Pre-exponential factor: A= 2.45x10-12 cm3 molec-1 s-1 -Exponential factor: Ea/R = 1775 K