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I am stuck on the part which asks me to calculate the critical atom dennsity. I have solved for the mass of the fuel in terms of the mass of the moderator. I would solve for the mass of the moderator by multiplying the volume of the reactor by the density of graphite and then plug that into the relation I have found for the mass of the moderator and the mass of the fuel, however since a slab reactor is defined only in width, I'm not sure how to find the volume of the reactor.

Thanks for any help.