half-life for second order

$\frac{d[R]}{dt}=-k[R]^{2}; \frac{1}{[R]}=kt + \frac{1}{[R]_{0}}; t_{\frac{1}{2}}=\frac{1}{k[R]_{0}}$

Hanniel U 2B
Posts: 76
Joined: Fri Sep 28, 2018 12:16 am

half-life for second order

In the 7th edition textbook, it states "not used" for the equation of half-life of the second order reaction But there are problems, for example, 7b.13 that ask us to calculate the half-life of a second order reaction. I am confused, can someone please clarify this?

Nicole Elhosni 2I
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

Re: half-life for second order

In class we discussed the half life of second order equations, so we do need to know it. The equation is t₁/₂= 1/k[A]ₒ

Nicole Lee 4E
Posts: 60
Joined: Fri Sep 28, 2018 12:16 am
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Re: half-life for second order

The half life equations are all on the equation sheet.

Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

Re: half-life for second order

You can derive the half life equation for a second order rate law equation by saying that 1/[0.5A]initial = -kt + [A]initial

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