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Really need help..

A fictitious element X is composed of 10.0 percent of the isotope 55^X , 20.0 percent of the isotope 56^X , and 70.0 percent of the isotope 57^X . Estimate the atomic mass of element X. 

 
NotSoSmart  Nov 14, 2017
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To find the solution for this, calculate the weighted average:

 

 (10×55+20×56+70×57) / (10+20+70) = 56.6 amu

 

.

 
GingerAle  Nov 14, 2017

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