Posted by Jim on Tuesday, October 26, 2010 at 9:00pm.
the activation energy for the decomposition of HI(g) to H2(g) and I2(g) is 186kj/mol. the rate constant at 555k is 3.42 x 10^7 L/mol*s. What is the rate constant at 645K?
Please show all steps USING THE ARRHENIUS EQUATION.
Here is my work so far:
K = A e^(Ea/RT)
3.52 x 10^7 = A e^(186000 J/mol / 8.314 J/mol*K x 555k)
A = 1.13 x 10^11
1.13 x 10^11 e^(186000 J/mol /8.314 J/mol*K x 645) = 9.76 x 10^5
However, according to the book, the answer should be 9.5 x 10^5

Chemistry  DrBob222, Tuesday, October 26, 2010 at 9:43pm
Here is how I do it.
ln(k2/k1) = (Ea/RT)(1/T1 1/T2)
k2 = ?? @ 645 K
k1 = 3.42 x 10^7 @ 555K
ln(??/3.42 x 10^7) = (186,000/8.314)*(1/555  1/645)
solve for ??. I get 9.47 x 10^5 with a few quick steps on the calculator. You should do the work more precisely than I but this shows you how to do it.
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