Question

The ratio of an enzyme catalyzed reaction rate to the
uncatalyzed rate (i.e. k_{cat} / k_{uncat}) is
equal to 10,000. Compute the amount, in kj/mol, by which the
activation energy for the reaction is lowered by the enzyme. Assume
the free energy of the reactants is the same in both cases. The
temperature is 300 K and the gas constant R is 8.314 J / (mol
K).

Answer #1

How much does an enzyme need to reduce the activation energy of
a reaction at 25 ºC in order to increase the rate 100-fold over the
uncatalyzed reaction? R = 8.3145 J/K mol. When answering, convert
your response to kJ/mol and input ONLY a number, rounded to one
decimal place.
Hint: the rate constant for an enzymatic reaction divided by the
uncatalyzed reaction = 10

A reaction proceeds with ∆ H = -80 kJ/mol. The energy of
activation of the uncatalyzed reaction is 80 kJ/mol, whereas it is
55 kJ/mol for the catalyzed reaction. How many times faster is the
catalyzed reaction than the uncatalyzed reaction at 25°C?

10. The difference in activation energy for the uncatalyzed and
catalyzed decomposition of hydrogen peroxide is 68.0x103
J / mol. At 298 K and assuming z and p (catalyzed) = z and p
(uncatalyzed), what is the ratio kcatalyzed /
kuncatalyzed?
(a) 8.83x1011 (b)
8.35x1012 (c)
0.83x109 (d)
8.3x1011 (e) 18.3x1011

At 298K, adding a catalyst makes a certain reaction go 250,000
times faster than the uncatalyzed reaction. The activation energy
for the uncatalyzed reaction is 80.0 kJ/mol. What is the activation
energy for the catalyzed reaction? Assume the frequency factor A is
the same for both catalyzed and uncatalyzed reactions.
A. 49.2 kJ/mol
B. 68.4 kJ/mol
C. 34.7 kJ/mol
D. 54.1 kJ/mol
E. 60.8 kJ/mol
Please provide explanation.

An uncatalyzed reaction has a rate of 0.0000048 sec–1 at room
temperature (25 °C). When an enzyme is added the rate is 32955
sec–1. If the height of the activation barrier for the uncatalyzed
rate is 27.9 kcal/mol, what is the height of the activation barrier
for the catalyzed rate? Report your answer in terms of kcal/mol to
the nearest tenths. Also, assume the pre-exponential terms for the
uncatalyzed and catalyzed reactions are the same.

The activation barrier for an uncatalyzed reaction is estimated
to be 15.3 kcal/mol. The activation barrier for the catalyzed
reaction is estimated to be 8.7 kcal/mol. How many times faster is
the catalyzed rate versus the uncatalyzed rate? In other words, by
what factor/coefficient do you have to multiply the uncatalyzed
rate to equal the catalyzed rate? Assume the temperature is 298 K,
and enter your answer to the nearest ones.

The activation barrier for an uncatalyzed reaction is estimated
to be 15.3 kcal/mol. The activation barrier for the catalyzed
reaction is estimated to be 8.7 kcal/mol. How many times faster is
the catalyzed rate versus the uncatalyzed rate? In other words, by
what factor/coefficient do you have to multiply the uncatalyzed
rate to equal the catalyzed rate? Assume the temperature is 298 K,
and enter your answer to the nearest ones.

The activation barrier for an uncatalyzed reaction is estimated
to be 15.3 kcal/mol. The activation barrier for the catalyzed
reaction is estimated to be 8.7 kcal/mol. How many times faster is
the catalyzed rate versus the uncatalyzed rate? In other words, by
what factor/coefficient do you have to multiply the uncatalyzed
rate to equal the catalyzed rate? Assume the temperature is 298 K,
and enter your answer to the nearest ones.

An uncatalyzed reaction has a rate of 4.8 x 10-7 s–1 at room
temperature (25°C). When an enzyme is added the rate is 3.3 x 104
s–1. If the height of the activation barrier for the uncatalyzed
rate is 28.2 kcal/mol, what is the height of the activation barrier
for the catalyzed rate? Report your answer in terms of kcal/mol to
the nearest tenths. Also, assume the pre-exponential terms for the
uncatalyzed and catalyzed reactions are the same.

The activation energy of a certain uncatalyzed reaction is 64
kJ/mol. In the presence of a catalyst, the Ea is 55 kJ/mol. How
many times faster is the catalyzed than the uncatalyzed reaction at
400°C? Assume that the frequency factor remains the same.

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