Q1=Consider the reaction: 5 A + 3 B ?? 2 C The rate of the reaction is found to
ID: 703994 • Letter: Q
Question
Q1=Consider the reaction:
5 A + 3 B ?? 2 C
The rate of the reaction is found to be 0.0512 M/s. What is the rate of change of C? Be sure to consider whether the substance is disappearing or appearing in your answer.
Q2=For the following first order reaction, the rate of reaction is 0.77 and the [A]0 = 8.01. Calculate the rate constant.
3 A ?? 2 B
Q3=Consider the following reaction. Use the rate data to write the rate law.
2 A + B ?? 2 C
Trial
[A]0
[B]0
[C]0
Rate (M/s)
1
0.45
0.68
0.038
4.803
2
0.9
0.68
0.038
9.606
3
0.45
1.36
0.038
19.212
?012
?012
rate
= k[A]
[B]
Q4= Consider the following reaction.
2 A + B ?? 2 C
Trial
[A]0
[B]0
[C]0
Rate (M/s)
1
0.14
0.46
0.08
7.819
2
0.28
0.46
0.08
15.638
3
0.14
0.92
0.08
15.638
What is the order with respect to B? 0,1,2,3, OR 4?
Q5= Consider the following reaction. Calculate the rate of reaction for trial 4..
2 A + B ?? 2 C
Trial
[A]0
[B]0
[C]0
Rate (M/s)
1
0.5
0.73
0.075
7.55
2
1
0.73
0.075
15.1
3
0.5
1.46
0.075
30.2
4
0.5
0.8
0.075
?
Q6= For the following first order reaction, the half-life is 89.1 and the [A]0 = 1.72. Calculate the rate constant.
2 A ?? 3 B
Q7= Consider the following reaction.
aA +bB ?? cC
whose first and second half-lives are 29.6 and 14.8 minutes respectively. If the rate constant is equal to 0.2287 and [A]0 = 13.54, calculate the [A] at t = 17.38 minutes.
Q8= Consider the following reaction
2 AX + 2 I ?? 2 AI + 2 X
where the following mechanism has been proposed:
2 AX + B
??
A2B + 2 X
A2B + 2 I
??
2 AI + B
What is the catalyst in this reaction?
Options are: AX, B, X, A_2B OR I
Q9= A researcher raises the temperature from 16 to 27.5 o C and finds that the rate of the reaction doubles. What was the activation energy (in Joules) for this reaction? (R = 8.3145 J/molK)
Q10= Consider the following reaction.
2 A + B + 2 C ?? 2 D + E
The following data was collected on the reaction.
Trial
[A]0
[B]0
[C]0
Rate (M/s)
1
0.41
0.36
0.41
1.638
2
0.82
0.36
0.41
3.276
3
0.41
0.72
0.41
3.276
4
0.41
0.36
0.82
1.638
Two mechanisms are proposed:
Mechanism 1:
A + B
??
D + Y
Y + C
??
X
X + A + C
??
D + Z
Z + A
??
E
Mechanism 2:
A + C
??
D + Y
Y + B + C
??
X + D
X + A + C
??
E
Which mechanism best fits the data? Select an answer (A) Mechanism (B) 1Mechanism 2
Which is most likely the rate-determining step? Select an answer (a) Step 1 (b) Step 2 (c) Step 3 (d) Step 4
Q11= The reaction A ? B + C is second order with respect to A. When [A]0 = 0.296 M, the reaction is 26.2 % complete at 86.8 min. Calculate the half-life for this reaction.
Trial
[A]0
[B]0
[C]0
Rate (M/s)
1
0.45
0.68
0.038
4.803
2
0.9
0.68
0.038
9.606
3
0.45
1.36
0.038
19.212
Explanation / Answer
Ans 1
the given reaction
5 A + 3 B = 2 C
rate of the reaction = 0.0512 M/s
Rate of consumption of A, (-rA) = 0.0512 M/s
rate of change of C =?
Relation between rate of consumption of reactants and Rate of formation of products
rA/(-5) = rB/(-3) = rC/2
0.0512/5 = rC/2
rC = 0.0512*2/5 = 0.02048 M/s
The value of rC is positive so the substance is appearing.
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