can you help me

Question

uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common isotopes. If the abundance of Uranium-234nis 0.01%, the abudndance of Uranium-235 is 0.71%, and the abundance of Uranium is 99.28%, what is the average atomic mass of uranium?

Answer 1

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Answer 2

(.0001x234) + (.0071x235) + (.9928x238)= 0.0234+1.668+236.286 = 237.98