CHEM 112 General Ch X C Chegg Study I Guided solut C The Reaction A+ B Yields C

Question

CHEM 112 General Ch X C Chegg Study I Guided solut C The Reaction A+ B Yields C O saplinglearning.com, ibiscms/mod/ibis/view.php?id-2243397 Print Calculator Periodic Table 000 Question 14 of 15 000 sapling learning 000 Using the given data, determine the rate constant of this reaction. 000 A 2B C+ D 000 000 Number Units 000 Select answer 000 000 000 000 000 000 Ask me anything Trial Al (M) B] (M) Rate (M/s 0.320 0.310 0.0101 0.320 0.620 0.0101 0.640 0.310 0.0404 Map Available From: Due Date: Points Possible: Grade Category Description Policies: You can check your You can view soluti You have four atte There is no penalty For multiple-choice on the number of c O Help With This T O Web Help & Vide o Technical Suppo 519 PM 1/20/2016

Explanation / Answer

Look at lines 1 and 2 in the table. The initial rate doesn’t depends on B concentration [B].

Look at lines 2 and 3 in the table. The rate increases 4 times if [A] is increased 2 times.

The rate law is

r = - d[A]/dt = k[A]2

Use any line to calculate k, e.g. for line 1:

Note: M= mol/L

r = k[A]2        

0.0101 M/s = k · (0.320 M)2

k = 0.0986 M-1s-1

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