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A doctor prescribes 200.0 mg of a drug that decays by 25% each hour. What is the half–life of the drug?   Question 5 options:   145 minutes   133 minutes   120 minutes How much drug remains after a time of 3 hours?   Question 6 options:   84.3 mg   50.0 mg   75.2 mg How much time is required for the mass of drug to decrease to 10.0 mg?   Question 7 options:   625 minutes   565 minutes   500 minutes

A doctor prescribes 200.0 mg of a drug that decays by 25% each hour. What is the half–life of the drug?   Question 5 options:   145 minutes   133 minutes   120 minutes How much drug remains after a time of 3 hours?   Question 6 options:   84.3 mg   50.0 mg   75.2 mg How much time is required for the mass of drug to decrease to 10.0 mg?   Question 7 options:   625 minutes   565 minutes   500 minutes

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter11: Chemical Kinetics
Section: Chapter Questions
Problem 11.19PAE
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Question

A doctor prescribes 200.0 mg of a drug that decays by 25% each hour.

What is the half–life of the drug?

 

Question 5 options:

 

145 minutes
 

133 minutes
 

120 minutes

How much drug remains after a time of 3 hours?

 

Question 6 options:

 

84.3 mg
 

50.0 mg
 

75.2 mg

How much time is required for the mass of drug to decrease to 10.0 mg?

 

Question 7 options:

 

625 minutes
 

565 minutes
 

500 minutes
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