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72.2% of element X is mass number 85. 27.8% is mass number 87. What is the average atomic mass of element X? (Round to the correct number of significant figures.)
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72.2% of element X is mass number 85. 27.8% is mass number

87. What is the average atomic mass of element X? (Round to
the correct number of significant figures.)

User Arul Kumaran
by
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1 Answer

2 votes

Answer:

11

Step-by-step explanation:

User Ed Burnette
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