Question

The following data are obtained for the gas phase decomposition of acetaldehyde: k (L/mole s)    0.0105            ...

The following data are obtained for the gas phase decomposition of acetaldehyde:

k (L/mole s)    0.0105             0.101               0.60                 2.92

            T (K)               700                  750                  800                  850

         Plot these data (ln k versus 1/T) and find the activation energy for the reaction.

Please show work and graph.

Science   Chemistry   
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Homework Answers

Answer #1

Plug in the datas in excel and plot the graph. Once you obtain the data, you get the following informations:

Since,   

ln k = ln A - Ea/RT

ln k = (- Ea/R) (1/T) + ln A

y = mx + c straight line equation.

so, here slope = (- Ea/R)

and intercept = ln A

From the graph, we obtained

slope =-22261.9054

(- Ea/R) = -22261.9054

? Ea = 22261.9054 x R

? Ea = 22261.9054 x 8.314

= 185085.48 J / mol

= 185.08 kJ / mol

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