# Arrhenius constantWatch

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Thread starter 13 years ago
#1
What is the arrhenius constant? i can do everything else in working out the arrhenius equation... but whats the constant??

At least I think thats why I keep working it out wrong... my results seem a little dodgy... if anyone could check them for me...

Temp (kelvin) 1 / Kelvin Rate ln of rate
235 0.0034 0.38 -0.97
303 0.0033 0.90 -0.11
313 0.0032 0.80 -0.22
323 0.0303 0.71 -0.34
When working out the activation enthalpy i got... (in order that the table is in..)
0.274
0.003
0.006
0.086

I'm pretty sure they're wrong... would really appriciate it if someone could go over it for me...

Thanks.
xXx
0
Thread starter 13 years ago
#2
hmmm.... tsr didn't like my table... can you see where i mean everything to be? i tried to make the tables columns alternate between purple n black to make it clear what goes where...

its messed up, but if you can do arrhenius equations please please try to help.
0
13 years ago
#3
How d'you get a temperature of 235K ?? I know it's a cold winter but....

Your last value for 1/T should be 0.0031

If you correct your temperature for the first value and substitute 0.0031 for the last value then you can plot a graph of lnK (or rate) against 1/T

Gradient gives you -Ea/R

Intercept (with the y axis) gives you Log(e) Arrhenius constant
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Thread starter 13 years ago
#4
(Original post by charco)
How d'you get a temperature of 235K ??
ooops... sry... meant to type 295k not 235k...
0
13 years ago
#5
see edited version above
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