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# A reactor is fueled with 4.000 kg of uranium enriched to 20.0 atom-percent in 235U, the...

A reactor is fueled with 4.000 kg of uranium enriched to 20.0 atom-percent in 235U, the rest being 238U. The fuel has a mass density of 19.2 g/cm3. Calculate: a) the mass of 235U? b) the atom densities (#atoms/cm3) of 235U and 238U?

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