Why Is My Calculation of Silver Isotope Abundance Incorrect?

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The discussion centers on a calculation error regarding the percent abundance of silver isotopes. The user attempted to find the abundance of the isotope with a mass of 106.91 amu, given an atomic weight of 108.0429 amu. The calculations initially presented were incorrect due to a typographical error in the equation setup. A suggestion was made to convert the final decimal results into percentage values for clarity. The user is encouraged to double-check their calculations and ensure proper conversion to resolve the issue.
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% Abundace Calc Error

here's the prob and my work can anyone help me figure out where I'm going wrong? thanks

The element silver has two naturally occurring isotopes with masses of 106.91 amu and 108.90 amu. What would be the percent abundance of the first isotope, if the atomic weight were 108.0429 amu?

108.0429 = 106.91*X + 108.90*Y (and since Y=1-X)
108.0429 = 106.91*X + 108.90 - 108.90*X
108.0429 - 108.90 = 106.91*X + 108.90*X
-(-1.99 = -0.8571*X) = 1.99 = 0.8571*X
X = 0.4307
Y= 0.5693

i did that and the online thing i enter the homework into says it's incorrect :confused:
 
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little typo in there the third line of my work should be
108.0429 - 108.90 = 106.91*X - 108.90*X
 
-(-1.99 = -0.8571*X) = 1.99 = 0.8571*X
should be -(-1.99X = -0.8571) = (1.99X = 0.8571)
 
Try converting your answers to percentage values instead of decimals.
 

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