n unknown mass of benzoic acid istitrated to the end point with a sodium hydroxide solution. The sodium hydroxide solution was made by dissolving 4.6556 g of sodium hydroxide in 500 mL total (using a volumetric flask). The initial burette reading is 43.74 mL and the final reading is 2.38 mL. Find the massof benzoic acid solution and the error

it is the minimum amount of material needed to sustain a fission reaction.

critical mass is the minimum amount of fissionable material that must be assembled for a sustained fission reaction to take place. although two to three neutrons are produced for every fission, not all of these neutrons are available for continuing the fission reaction. if the conditions are such that the neutrons are lost at a faster rate than they are formed by fission, the chain reaction will not be self-sustaining.   at the point where the chain reaction can become self-sustaining, this is referred to as critical mass.