To calculate the average atomic mass of neon in nature, you need to take the weighted average based on the natural abundance of each isotope. This means that for each isotope, you multiply its atomic mass by its natural abundance (expressed as a decimal) and then sum those values together.
Given the data:
- Neon-20: \(19.992 , \text{amu} \times 0.9048\)
- Neon-21: \(20.993 , \text{amu} \times 0.0027\)
- Neon-22: \(21.991 , \text{amu} \times 0.0925\)
The correct setup for the calculation is:
\[ (19.992 , \text{amu} \times 0.9048) + (20.993 , \text{amu} \times 0.0027) + (21.991 , \text{amu} \times 0.0925) \]
So, the correct response is:
(19.992 amu×.9048)+(20.993 amu ×.0027)+(21.991 amu ×.0925)
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