The rate coefficient (k) for a particular reactions is $1.3\times {10}^{-4}{\mathrm{M}}^{-1}{\mathrm{s}}^{-1}\text{ at }{100}^{\circ }\mathrm{C}\text{, and }1.3\times {10}^{-3}{\mathrm{M}}^{-1}{\mathrm{s}}^{-1}\text{ at }{150}^{\circ }\mathrm{C}$ What is the energy of activation (E_a) (in kJ) for this reaction? (R= molar gas constant = 8.314 JK^-1 mol^-1)