iPad 8:47 PM * 68% Chapter 14 Homework Set C: Attempt2 Question Completion Statu
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iPad 8:47 PM * 68% Chapter 14 Homework Set C: Attempt2 Question Completion Status UESTION 2 Sucrose decomposes according to first order kinetics in an acidic solution with a rate constant of 0.216 h-1 at 25 °c. If one starts with 1.74 M of sucrose, how many hours will it take for 31.6% of it to decompose? (Be careful to recognize that the % is not what 96 remains) 5.00000 points Save Answer UESTION 3 Sucrose decomposes according to first order kinetics in an acidic solution with a rate constant of 0.216 h-1 at 25 °c. If one starts with 2.29 M of sucrose, how many hours will it take for it to decompose to 29.4% of its initial value? Click Save and Submit to save and submit. Click Save All Answers to save all answers Save All Answers Close Window Save and SubmitExplanation / Answer
2)
we have:
[sucrose]o = 1.74 M
Remaining sucrose = (100 - 31.6) % = 68.4 %
[sucrose] = 68.4 % of 1.74 M = 1.19 M
k = 0.216 h-1
use integrated rate law for 1st order reaction
ln[sucrose] = ln[sucrose]o - k*t
ln(1.19) = ln(1.74) - 0.216*t
0.174 = 0.5539 - 0.216*t
0.216*t = 0.3799
t = 1.76 h
Answer: 1.76 h
3)
we have:
[sucrose]o = 2.29 M
[sucrose] = 29.4 % OF 2.29 M = 0.673 M
k = 0.216 h-1
use integrated rate law for 1st order reaction
ln[sucrose] = ln[sucrose]o - k*t
ln(0.673) = ln(2.29) - 0.216*t
-0.396 = 0.8286 - 0.216*t
0.216*t = 1.2246
t = 5.67 h
Answer: 5.67 h
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