Posted by Jane on Saturday, July 17, 2010 at 3:33pm.
I don’t understand how to write this equation.
Write an equation relating the concentration for a reactant A at t=0 to that at t=t for a firstorder reaction. Define all the terms, and give their units. Do the same for a second order reaction.
Would it be the rate law equation?? Please help.

Chemsitry  DrBob222, Saturday, July 17, 2010 at 4:43pm
Yes, I think so. For first order,
ln(Ao/A) = akt; therefore, for t = 0, we have ln(Ao/A) = 0
(Ao/A) = 1
and A = Ao = 1
Then I believe you are to use the original with t for t, and solve for (A).
Same thing with second order but more challenging mathematically.
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