The two major isotopes of uranium are (235.0409 amu) and (238.0508 amu). Given that the natural abundances of and are about 0.72% and 99.28%, respectively, what is the molar mass (atomic weight) of uranium?
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The molar mass of uranium is generally accepted to be 238.02913g/mole, based on the atomic
masses of the isotopes 235U(235.043924) and 238U(238.050784) and natural abundances of 99.2798%
and 0.7202% for the two isotopes. However, in one uranium mine inSouth Africa, the average molar
molar mass of the uranium was 238.0375 g/mole. What are the %abundances of the two isotopes, 235U
and 238U?
Magnesium has three isotopes, , , and . What is the average atomic mass of magnesium if the percent abundances of the isotopes are , , and , respectively?