The hydrogenation of acetylene (C2H2) on Pd metal sites (*) is proposed to occur via elementary steps consisting of: 1) QE dissociative adsorption of H2: 2) QE molecular adsorption of C2H2; 3) & 4) QE sequential addition of H" to form C:Ha"; 5) Irreversible desorption of ethylene. Write the mechanism of the reaction with the stoichiometric number of each step. Derive the rate expression in terms of constants and measurable quantities when C:H," and " are the MARI. If C;H, is in the MARI expression, why is the rate independent of the concentration of C¿H4 in the gas phase? At some conditions, the experimental rate is zero order in both CH2 and H2. What additional assumption(s) are required for this observation to be consistent with the rate expression derived in part (b)? 1) If, under certain experimental conditions, an effective zero order rate constant is measured, explain the chemical significance of this constant (in terms of rate or equilibrium constants for elementary steps) using the rate expression in part (b).

The hydrogenation of acetylene (C2H2) on Pd metal sites (*) is proposed to occur via elementary steps consisting of: 1) QE dissociative adsorption of H2: 2) QE molecular adsorption of C2H2; 3) & 4) QE sequential addition of H" to form C:Ha"; 5) Irreversible desorption of ethylene. Write the mechanism of the reaction with the stoichiometric number of each step. Derive the rate expression in terms of constants and measurable quantities when C:H," and " are the MARI. If C;H, is in the MARI expression, why is the rate independent of the concentration of C¿H4 in the gas phase? At some conditions, the experimental rate is zero order in both CH2 and H2. What additional assumption(s) are required for this observation to be consistent with the rate expression derived in part (b)? 1) If, under certain experimental conditions, an effective zero order rate constant is measured, explain the chemical significance of this constant (in terms of rate or equilibrium constants for elementary steps) using the rate expression in part (b).

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Concept explainers

Aromatic Compounds

Aromatic organic compound or aromatic system is an important class of hydrocarbons under the branch of organic chemistry. Aromatic compounds are also called arenas. The definition of aromatic organic compounds can be stated as a class of organic compounds with a planar cyclic ring of atoms bonded through alternated single and double bonds. Due to these alternating bonds, a peculiar feature termed as ‘resonance’, that is, delocalization of pi electrons or the electrons is shared within the atoms of the ring which are present in the aromatic compounds. The word ‘aromatic’ includes a Greek word ‘aroma’ which means smell, indicating that they were named as such due to the sweet odor they produce. Many well-known flavors such as vanilla, cinnamon, and few scents from flowers are extracted from aromatic compounds. Benzene with chemical formula C6H6 is a very common aromatic compound that contains six atoms of carbon held in the cyclic ring of alternate double bonds. It is also to be noted that not all aromatic compounds contain benzene ring. This can be explained by Huckel’s rule.

Question

4. The hydrogenation of acetylene (C2H2) on Pd metal sites (*) is proposed to occur via
elementary steps consisting of: 1) QE dissociative adsorption of H2; 2) QE molecular
adsorption of C2H2; 3) & 4) QE sequential addition of H* to form C2H4*; 5) Ireversible
desorption of ethylene.
(a)
Write the mechanism of the reaction with the stoichiometric number of each step.
(b)
Derive the rate expression in tems of constants and measurable quantities when CH,*
and * are the MARI. If C;H4 is in the MARI expression, why is the rate independent of
the concentration of C¿H4 in the gas phase?
(c)
At some conditions, the experimental rate is zero order in both CH2 and H2. What
additional assumption(s) are required for this observation to be consistent with the rate
expression derived in part (b)?
If, under certain experimental conditions, an effective zero order rate constant is
measured, explain the chemical significance of this constant (in terms of rate or
equilibrium constants for elementary steps) using the rate expression in part (b).
(d)

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