QQuestionChemistry
QuestionChemistry
"The average atomic mass of aluminum is 26.98 amu. What is true about the mass of aluminum atoms?
A. All aluminum atoms weigh exactly 26.98 amu.
B. Most atoms of aluminum are Al- 27.
C. Most atoms of aluminum are Al- 26.
D. Most atoms of aluminum are Al- 13."
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Answer
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Step 1Let's solve this step by step:
Step 2: Understand the concept of average atomic mass
- The average atomic mass represents the weighted average of all isotopes of an element - This means different isotopes of aluminum contribute to the total average mass - The average mass of 26.98 amu suggests a mix of isotopes around this value
Final Answer
Most atoms of aluminum are Al- 27. The key points are: - Average atomic mass reflects the weighted distribution of isotopes - Al- 27 is the most abundant aluminum isotope - The average mass of 26.98 amu closely matches the mass of Al- 27
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