For the gas phase decomposition of dinitrogen pentoxide,

N2O5——>2 NO2 + 1/2 O2

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 -1.24×104 K and a y-intercept of 31.3. 

The activation energy for the gas phase decomposition of dinitrogen pentoxide is  _________kJ/mol.