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Grade: 11
        
ug is known to be ineffective after it has decomposed 25% the original concentration of a sample was 500 unkits/ml when analyzed 20 months later the concentration was found to be 450 units /ml assuming that decomposition is of 1st order what will be the expiry time of the drug?
11 months ago

Answers : (1)

BIKRAM
53 Points
							
 
ln(A0/A)= Kt : K=(1/20×ln(500/450)=5.268×10-3 mon-1
A= 500-500×(25/100)=375 units/ml
expiry date (t)= (1/K)ln(500/375)= 54.6 month
11 months ago
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