A drug is known to be ineffective after it has to be decomposed to the extent of 30% the original concentration of a sample was 500units /mL when analysed 20 months later the concentration was found to be 420units /mL assuming that the decomposition is of first order what will be the expiration time to the drug sample what is the half life of the drug
Answers
Answered by
1
Answer:
please mark a brilliant
Explanation:
k=
t
2.303
log[
a−x
a
]
=
20
2.303
log
10
4.2
5
=0.00872 month
−1
Expiry time t can be calculated as:
k=
t
2.303
log
10
[
a−x
a
]
0.00872=
t
2.303
log[
70
100
]
t=40.9=41 months
Answered by
0
Answer:
yes it should be approx 41 months
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