## Finding rate constant

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Diviya Khullar 1G
Posts: 59
Joined: Fri Sep 28, 2018 12:19 am

### Finding rate constant

How do you find the rate constant for the following first-order reaction;
$2A\rightarrow B+C$, given $[A]_{0}=0.153$ mol $\cdot$ L-1 and that after 115s the concentration of B rises to 0.034 mol $\cdot$ L-1.

varunhariharan
Posts: 30
Joined: Mon Jan 07, 2019 8:16 am

### Re: Finding rate constant

The production of B is half the rate of the disappearance of A. With stoichiometry from there, the concentration of A must have decreased by 2(0.034 M) = 0.068M. This should be subtracted from the initial concentration of A to determine the concentration after 115s. Then ln([A]/[A0])=-kt should be used to determine k.

Claudia Luong 4K
Posts: 59
Joined: Fri Sep 28, 2018 12:25 am

### Re: Finding rate constant

We can use the straight line formula for first-order reactions.

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