(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The activation energy for the reaction

N2O(g) --> N2(g) + O(g)

is 250 kJ/mol. If the rate constant is 3.4 s–1 at 1050 K, at what temperature will the rate constant be one thousand times smaller?

The correct answer is : 846 K

2. Relevant equations

Arrhenius equation:

ln{k2/k1} = Ea/R {(1/T1) - (1/T2)}

3. The attempt at a solution

Ok, I can use this equation to find other variables, and I know that I am making some sort of calculator error or something, and I know its probably the stupidest of mistakes. I am trying to study for an exam, and Im aware that this probably wont even show up, but its driving me crazy that I continually get the wrong answer, and Im off by soooo much.it looks simple, plug in the numbers and out pops an answer but I just cant get it.

T1 =1050K

K1 = 3.14/s

Ea = 250KJ

K2 = 3.14E3

I have tried this a number of ways and its only confused me more. Do I change KJ to J? I know Temp. should be in Kelvin, what about R, could I be using the wrong one? I cant look at this question any longer, any help would be much appreciated.

(when I emailed my T.A. he emailed me back to inform me that I wont fail the exam just because I dont know how to do this question.... thats real helpful!)

Thank you,

M

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Arrhenius equation (chemistry)

**Physics Forums | Science Articles, Homework Help, Discussion**