Please answer and show all work!! WIll rate if correct.

3. In the classic James Bond style, Dr. Evil activates a chemical weapon so she can escape. In this case, a reactive chemical was inserted in the top of a 30 cm cylindrical vessel containing a polymer core, saturating the top surface. Critical mass is achieved when the midpoint reaches 2% reactant concentration, igniting the weapon. Dr. Evil laughs at you and says, Good luck saving the city; you may want to try the landfill an hour away. But, I don't think you'll make it. The diffusion coefficient is 7 x 10-3 cm/s! Is Dr. Evil correct? Can you save the city? How