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Chemistry 10 Online
OpenStudy (anonymous):

the atomic weight of antimony is 121.76 amu. two naturally occurring isotopes of antimony. 121-Sb has an isotopic mass of 120.9038 amu and natural abundance of 57.40%. What is the isotopic mass of the other isotope, 123-Sb?

OpenStudy (aaronq):

so you know one isotope has 57.40% abundance, the other must have 100%-54.40% right? so the other has 42.6% mass of 121 (% abundance) + mass of 123 (% abundance) = total mass (atomic weight) (120.9038 amu) (0.5740) + (x amu)(0.426) = 121.76 amu solve for x

OpenStudy (anonymous):

thanks again

OpenStudy (anonymous):

whatd you get for this? when i solved for x i got 4. .... and it doesnt make sense with the problem?

OpenStudy (aaronq):

i got 122.9136

OpenStudy (anonymous):

ehh thats close enough to what i got which is 122.209 lol

OpenStudy (aaronq):

haha

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