# Rate Equation and Order Reaction

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Chemical Kinetics

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1. For the overall hypothetical reaction A + 5B ---> 4C the rate of appearance of C given by may also be expressed as: A.
B.
C.
D.

2. For the reaction 4 NH3(g) + 5 O2(g) ---> 4 NO(g) + 6 H2O(g), the value of -[NH3]/t = 2.6 x 10-3 M/s at a particular time. What is the value of -[O2]/t at the same instant? A. 1.3 x 10-2 M/s

B. 2.08 x 10-3 M/s
C. 2.6 x 10-3 M/s
D. 3.25 x 10-3 M/s
E. 520 M/s

3. What is the overall order for the following reaction between acetone and iodine? (The experimental rate law is rate = k [CH3COCH3] [H3O+] ) CH3COCH3(aq) + I2(aq) +H2O ---> CH3COCH2I(aq) + H3O+(aq) + I-(aq) A. 0

B. 1
C. 2
D. 3
E. 4

4. Nitric oxide (NO) reacts with hydrogen (H2) according to the equation: 2 NO(g) + 2 H2(g) ---> N2(g) + 2 H2O(g) The following initial rates of reaction have been measured for the given reactant concentrations. Expt. # | NO | H2 | Rate (M/hr)|

1 | 0.010 | 0.020 | 0.020|
2 | 0.015 | 0.020 | 0.030|
3 | 0.010 | 0.010 | 0.005|

Which of the following is the rate law (rate equation) for this reaction? A. rate = k[NO]2 [H2]
B. rate = k[NO] [H2]2
C. rate = k[NO] [H2]4
D. rate = k[NO] [H2]
E. rate = k[NO]1/2 [H2]1/4

5. A certain first order reaction A ---> B is 46 % complete in 68 min at 25°C. What is its rate constant? A. 9.06 x 10-3 min-1
B. 1.14 x 10-2 min-1
C. 31 min-1
D. -1.14 x 10-2 min-1
E. 51 min-1

6. What is the value of the rate constant for a first order reaction for which the half-life is 26.7 min? A. 18.5 min-1
B. 38.5 min-1
C. 9.25 min-1
D. 19.3 min-1
E. 0.026 min-1

7. A reaction which is second order has a rate constant of 1.0 x 10-3 L· mol-1 ° sec-1. If the initial concentration of the reactant is 0.200 M, how long will it take for the concentration to become 0.0250 M? A. 4.0 x 104 s

B. 3.5 x 104 min
C. 3.5 x 104 s
D. 8000 s
E. 3.5 x...