235
234
2) Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common
isotopes. If the abundance of U is 0.01%, the abundance of U is 0.71%, and the abundance of
U is 99.28%, what is the average atomic mass of uranium?
238

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass = (234×0.01)+(235×0.71)+(238+99.28) /100

Average atomic mass = 2.34 + 166.85+23628.64 / 100

Average atomic mass = 23797.83 / 100

Average atomic mass = 237.97 amu.

235 234 2) Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common isotopes. If the abundance of U is 0.01%, the abundance of U is 0.71%, and the abundance of U is 99.28%, what is the average atomic mass of uranium? 238

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235
234
2) Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common
isotopes. If the abundance of U is 0.01%, the abundance of U is 0.71%, and the abundance of
U is 99.28%, what is the average atomic mass of uranium?
238