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Aleks04 [339]
3 years ago
7

Element X has 2 following stable isotopes, X-23 (relative abundance 41.9%) and X-25 (relative abundance is [100-41.9]%). What is

the average atomic mass of Element X? Record the numerical answer to the hundredths place (2 places after the decimal).
Chemistry
1 answer:
svetoff [14.1K]3 years ago
4 0
<h3>Further explanation</h3>

Isotopes : the same atomic number, but different mass numbers  

Atomic mass is the average atomic mass of all its isotopes  

avg atomic mass = m1.%m1 + m2.%m2....mn.%mn

You did not include the mass of each isotope

Element X :

X-23 = 41.9%

X-25 = 58.1%

The average atomic mass of Element X :

\tt =0.419\times mass~X-23+0.581\times mass~X-25

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