OpenStudy (anonymous):
Element Fictionium (Fc) has three isotopes. The first, Fc-112 has a mass of 112.4469 amu and makes up 20.62% of a standard sample. The second isotope, Fc-114 has a mass of 113.5518 amu and makes up 57.00% of a standard sample. The third isotope, Fc-115 has a mass of 115.3332 amu and makes up the remainder of a standard sample. What is the average atomic mass of this element?
OpenStudy (abmon98):
Isotope Mass % Abundance Portion of Average FC-112: 112.4469 20.62 112.4469*20.62/100 FC-114 113.5518 57.00 113.5518*57.00/100 FC-115 115.3332 22.38 115.3332 *22.38/100 Sum Portion of Average Note that % Abundance should Add up to 100 that's why i added 20.62 to 57.00 and subtracted it from 100 to obtain the % abundance of Isotope of FC-115
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