Caffeine in beverages has been a hot topic for some time. It takes time for the...
Caffeine in beverages has been a hot topic for some time. It takes time for the body to process caffeine (assume first-order kinetics). The half-life of caffeine in the body is 4.90 hours. Caffeine is also found in chocolate. If a person eats a chocolate bar with 30.0 mg of caffeine at the beginning of a 3.00 hour test, how much (in mg) would be left in their system at the end of the test? Report your answer using 3 significant figures.
Homework Answers
K = 0.693 / t1/2
= 0.693 / 4.90
= 0.1414 s-1
Ln ( A° / A ) = rate constant * time
= ln ( 30.0 / A ) = 0.1414 * 3.00
A = 19.63 mg
Or 19.6 mg
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