Multiple Choice
Which of the following expressions correctly represents the average rate of appearance of a product in a chemical reaction?
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15. Chemical Kinetics
Average Rate of Reaction
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Consider the following reaction:2 H2O2 (aq) → 2 H2O (l) + O2 (g)
Calculate the rate of the reaction between 25 sec and 65 sec.
A
0.018 M/s
B
9.0×10–3 M/s
C
0.036 M/s
D
0.041 M/s
E
0.083 M/s
Verified step by step guidance1
Identify the time interval for which the rate of reaction needs to be calculated: between 25 sec and 65 sec.
Determine the change in concentration of H2O over the given time interval. From the table, at 25 sec, [H2O] = 1.30 M and at 65 sec, [H2O] = 2.02 M.
Calculate the change in concentration of H2O, Δ[H2O] = [H2O] at 65 sec - [H2O] at 25 sec.
Determine the change in time, Δt = 65 sec - 25 sec.
Calculate the rate of reaction using the formula: Rate = Δ[H2O] / Δt. This will give you the average rate of formation of H2O over the specified time interval.
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