Unformatted text preview: 22. What is the molecularity of the following elementary step? NH2C1(aq) + 0H‘(aq) ——> NHCl‘(aq) + H200)
w v A. unimolecular @molecular
C. termolecular D. tetrarnolecular E. Need to know the reaction order before molecularity can be determined. 23. Ammonia will react with oxygen in the presence of a copper catalyst to form nitrogen and water. From 437.5 K to 452.0 K, the rate constant increases by a factor of 4.27. What is the activation energy of this
oxidation reaction? [ R = 8.314 13 ~ 3 kil/mol ] A. 24.5kJ/mol in i i :_ hzwwm ,1.— f‘ .L.
B. 165kJ/mol Li 91’ qugg L53 (+37g C. 242 kJ/rnol A
D. 1630 kJ/mol Nib — Lit: E. > 104 kJ/mol 24. The decomposition of dinitrogen pentaoxide has an activation energy of 102 kJ/mol and AH"rxn = + 55 kJ/
mol. What is the activation ener for the reverse reaction?
gy Eco: l O a A. — 55 kJ/mol ' ’— ,_ <E1+47kllmol b5" i09 + X
c. +55 kJ/mo-l , + to; D. +102 kJ/mol E. _ 4‘7’kil/mol 25. Can the rate law be predicted from the stoichioinetry of an overall chemical reaction? A. no
B. yes 26. Suppose a reversible reaction has KC = 1.0 E — 67. Arbitrary amounts of all species in the reaction (i.c., all products and all reactants) are placed into a vessel. Can we state with certainty that the reaction reaches
dynamic equilibrium very slowly? A. no
B. yes Page 6 ...
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- Fall '08
- Organic chemistry