Question
problem 7
What is the mass in kg of a molecule of uranium dioxide UO_2?)..? How many atoms of deuterium are then- in 2 kg of water? A reactor is fueled with 3 kg uranium enriched to 15 atom-percent in U-235. The remainder of the fuel is U-238. The fuel was a mass density of 19 2 g/cm^3. (a) What is the mass of 235-U in the reactor? (b) What are the atom densities of U-235 and U-238 in the fuel? What are the molecular weights (g/mol) of (a) H_2 gas, (b) H_2O, and (c) HDO? A sample of uranium is enriched to 5 atom percent in U- 235 with the remainder being U-238. (a) What is the atom densities in U-234, U-238, O? What is the enrichment of 235-U in weight-percent? In fission reactors one deals with neutrons having kinetic energies as high as 20 MeV. How much error is incurrent in computing the speed of 20 MeV neutrons by using the classical expression rather
Explanation / Answer
5 atom percent of U-235 = 5 * 235 = 1175 g
95 atom percent of U-235 = 95 * 238 = 22610 g
masstotal = 1175 + 22610 = 23,785 g
235-U weight percentage = 1175 / 23,785 * 100%
= 4.94 %
