A first order reaction is half-completed in 45 minutes. How long does – McqOptions

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1.	A first order reaction is half-completed in 45 minutes. How long does it need for 99.9% of the reaction to be completed?
A.	20 hours
B.	10 hours
C.	\[7\frac{1}{2}\] hours
D.	5 hours
Answer» D. 5 hours

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