[bennyh]

Hi guys ,
how can i calculate a rate of reaction that absorb/release energy and the temperature change by time?
A-->B so dB/dt=K[ B]^b

i mean K of reaction is a function of the temperature K=Aexp(-Ea/RT)

and T also is a function of time . so there is any analytical way to calculate?
thanks

[Borek]

Google for thermal runaway. You need some additional assumptions about ΔH for the reaction and heat capacity of the mixture (they will be functions of temperature as well). If memory serves me well it yields a nasty integral, so it is better to solve numerically.