Hi there I've been trying to work this out and didn't quite succeed, so I'm hoping someone might help me out a bit. I've been using the Arrhenius equation to calculate reaction rates at 2 temperatures, so I took the integral and got k2/k1 = e^(Ea/R(1/T1 - 1/T2)) This paper I've been reading (doing similar things as I am) is however suggesting the following equation: k2/k1 = (T2+460)/(T1+460) * 10^((-394)*H*(1/(T2+460)-1/(T1+460))) The second equation isn't using SI units, so temperatures are in F and entalphy is in kcal. I've been trying to convert the second equation into the first one (or vice versa) to check everything is OK and I can't get it to work. My main problem is the first part, (T2+460)/(T1+460). My calc is a bit rusty, so I'm not sure where I'm going wrong (or if the problem is elsewhere)... Would really appreciate some help. Thanks!