Asked by Odesa

The half-life of a first order reaction is determined to be 85.5 years. How long will it take for the concentration of the reactant to reach 2% of its initial value?
Answered by anonymous2
the correct answer is 536 years (green check!!)
Answered by Paul
had a red x !!! the answer is not 536!
Answered by anonymous2
i have the green check!
you have to write only 536 in the box!
Answered by Paul
Did it with 536 and still red X. must be a system error.
Answered by Hi
Actually its 443
Answered by Paul
Another red X for 443
Answered by Anonymous
The years value is diferent, I got the green on 536
Answered by Hi
That could be the reason. Use the method used in H6P5.
Answered by Paul
I am in agreement, because there are other questions whereby the years is 90.2, anyway could anyone give a step by step method in answering the above question?
Answered by Anonymous
The values are different for every person - its an anti-cheat system.
Answered by Paul
Got it 482.55003
85.5 years X (multiply) with 5.64386
Answered by Odesa
Thank you all.
Answered by Great
yes Paul is right...!!nice shortcut..!!
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