wher e: A = pr e-exponent ial facto r, Ea
= activatio n
en ergy. The value of the acti vation energy can be
obt ained from a plot of ln k v s 1/T. Thi s plot gave a
stra ight line with a slope of
E a
R
¼44 68:6 K. The
ac tivation energy (E a
) for the dissol ution react ion was
thu s calcul ated as 37.2 kJ mol
)1
. The chemi cal dissolu-tion of vanadium pentoxi de in Br
)
solut ion is thus