First Order Reaction
Chapter 15-8
UALR
Dr. Robert Belford & Xiaomin Tu



Consider the first order reaction Br2----->2Br

Question 1
What is the rate constant if it takes 60 second for a 0.50 M mixture to decompose to 0.25M?
(A)  0.012s-1M-1
(B)  0.033s-1M-1
(C)  0.067s-1M-1
(D)  1.00s-1M-1
 
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Question 2
How long does it take for the reaction in question 1 to decompose to 0.10M?
(A)  60s
(B)  134s
(C)  242s
(D)  367s
 
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Question 3
How long does it take for the reactant in question 1 to decompose to 15%?
(A)  60s
(B)  120s
(C)  158s
(D)  343s
 
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Question 4
How long does it take for 15% of the reactant in question 1 to be comsumed?
(A)  2.5s
(B)  6.6s
(C)  8.9s
(D)  13.5s
 
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Question 5
What is [Br2] of a 0.80M [Br2] solution after 3 minutes?
(A)  0.092M
(B)  0.104M
(C)  0.125M
(D)  0.40M
 
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Question 6
Calculate the initial [Br2] if [Br2] =0.005M after 10 minutes?
(A)  5.55M
(B)  6.70M
(C)  8.90M
(D)  10.0M
 
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