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Standard X
Chemistry
Factors Affecting the Rate of a Chemical Reaction
From the foll...
Question

From the following data answer the questions:
Reaction: A+B → P

[A]M[B]MInitial rateM sec−1
300 K400 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3
1.0×10−36.0×10−51.6×10−2
The energy of activation for reaction (kJ/mol) is:

A
20.83
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B
13.83
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C
15.23
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D
10.23
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Solution

The correct option is B 13.83
The arrhenius equation is k=A.e−Ea/RT.
At two different tempratures, this equation becomes lnk2k1=EaR[1T1−1T2]
Substitute values in the above equation.

ln2.0×10−35.0×10−4

=EaR[1300−1400]

Ea=13.83 kJ/mol

Thus the energy of activation is 13.83 kJ/mol

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Q.
From the following data answer the questions:
Reaction: A+B → P

[A] M[B] MInitial rateM sec−1
300 K400 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3
1.0×10−36.0×10−51.6×10−2
The value of rate constant at 300 K is (m−2sec−1)
Q.
From the following data answer the questions:
Reaction: A + B → P

[A]M[B]MInitial rateM sec−1
300 K400 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3
1.0×10−36.0×10−51.6×10−2

The order w.r.t A is:
Q. Following data are given for the reaction between A and B.
[A]/mol L−1[B]/mol L−1Initial rate/ mol L−1s−1 at
300 K		320 K
2.5×10−43.0×10−55.0×10−42.0×10−3
5.0×10−46.0×10−54.0×10−3-
1.0×10−36.0×10−51.6×10−2-
The rate constant at 300 K is:
Q.
Expt.
No.		 [A]
(molL−1)		 [B]
(molL−1) 		Initial rate (molL−1s−1)
300K 320K
(1) 2.5×10−4 3.0×10−5 5.0×10−4 2.0×10−3
(2) 5.0×10−4 6.0×10−5 4.0×10−3...
(3) 1.0×10−3 6.0×10−5 1.6×10−2...
From the data given above for the reaction between A and B, calculate the following:
(i) The order of the reaction with respect to A and with respect to B,
(ii) The rate constant at 300 K
(iii) The energy of activation and
(iv) The pre-exponential factor.
Q. From the given table for reaction between A and B:
Initial rateInitial rate [A] mol litre−1[B] mol litre−1at 300 Kat 320 K mol litre−1 s−1 mol litre−1 s−1(I) 2.5×10−43.0×10−55.0×10−42.0×10−3(II)5.0×10−46.0×10−54.0×10−3−(III) 1.0×10−36.0×10−51.6×10−2−

Rate constant at 300 K is x×108 mol−2 litre2 s−1. Find the value of x.
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