For the reaction of $\mathrm { H } _ { 2 }$ with $\mathrm { I } _ { 2 }$, the rate constant is $2.5 \times 10 ^ { - 4 } \mathrm { dm } ^ { 3 } \mathrm {~mol} ^ { - 1 } \mathrm {~s} ^ { - 1 }$ at $327 ^ { \circ } \mathrm { C }$ and $1.0 \mathrm { dm } ^ { 3 } \mathrm {~mol} ^ { - 1 } \mathrm {~s} ^ { - 1 }$ at $527 ^ { \circ } \mathrm { C }$. The activation energy for the reaction, in kJ mol$^{-1}$ is:\\
$\mathrm { R } = 8.314 \mathrm { JK } ^ { - 1 } \mathrm {~mol} ^ { - 1 }$\\
(1) 166\\
(2) 59\\
(3) 72\\
(4) 150