Asked by 0oooooooo0

A SAMPLE OF ANTIMONY, Ar=121.8, WAS ANALYSED AND WAS FOUND TO CONSIST OF 60% OF 121Sb AND ONE OTHER ISOTOPE. DETERMINE THE MASS NUMBER OF THE OTHER ISOTOPE IN THE SAMPLE OF ANTIMONY.

please help I'm really stuck,
Answered by bobpursley
assume you have 100 grams. It becomes the overused algebra candy mixture problem.

60*121+40*X=121.8*100
solve for x
Answered by Dannau
Thats wrong. The answer is 123
Answered by 0oooooooo0
How do you get that though
Answered by Muhammad
121.8=(0.6*121)+(0.4*x)
121.8=72.6+0.4x
49.2=0.4x
x=123
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