Use Arrhenius equation k = A e Ea/RT to calculate rate of reaction and rate constant


2)            Given that:

 rate = k[N2O5]2

 A = 6 x 1023 L.mol-1.s-1

 Ea = 250 kJ.mol-1

 R = 8.314 J.mol-1.K-1


Use the Arrhenius equation to calculate the rate constant (k) and hence a value for the rate of reaction when [N2O5 ] = 0.32 mol.L-1 at a temperature of 320 oC.

k = A e Ea/RT

Ea and R should have the same energy units so that they cancel so convert Ea from Kj to J.

Ea = 250 x 103 J.mol-1 or (250 E3)

Also temperature must be in Kelvin so 320C = 393 K.

Now plug in

k = 6 x 1023 mol/L sec x e (250 E3 / (8.314 J/mol K) x 593 K))

Once you have found the value for k you can plug into the rate law

Rate = k[N2O5]2  and find the Rate.

Chat with an Online Tutor
Get help immediately by chatting with an live tutor right now

If you find this answer useful please share it with other students.