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    A sample of antimony Ar= 121.7 was analyses and was found to consist of 60% 121 Sb and one other isotope. Determine the mass number of the other isotope in the sample of antimony

    I know the answer is Sb123 but idk why so please will someone work through it for me x


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    (Original post by halliethestudent)
    A sample of antimony Ar= 121.7 was analyses and was found to consist of 60% 121 Sb and one other isotope. Determine the mass number of the other isotope in the sample of antimony

    I know the answer is Sb123 but idk why so please will someone work through it for me x


    Posted from TSR Mobile
    (121 x 0.60) + (? x 0.40) = 121.7

    Solve equation for ?


    121.8 works better
 
 
 
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