For the gas phase isomerization of isopropenyl allyl ether
CH2=C(CH3)-O-CH2CH=CH2 → CH3COCH2CHCH=CH2
the rate constant has been determined at several temperatures. When ln k in s^-1 is plotted against the reciprocal of the Kelvin temperature, the resulting linear plot has a slope of -1.48x10^4 K and a y-intercept of 26.0.
The activation energy for the gas phase isomerization of isopropenyl allyl ether is ____ kJ/mol.