60. Solving a chemistry problem

716. For the bimolecular reaction H2 I2 → 2HI, the pre-exponential factor is 1.56*1011 L*mol-1 *s-1 and the activation energy is 1.65*105 J/mol. How many times does the half-life of iodine decrease with increasing temperature from 600 K to 613 K, if the initial concentration of iodine is much less than the concentration of hydrogen. (Solve by approximation that the concentration of hydrogen is constant).