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An unknown element has isotopes with atomic masses and natural abundances as follows: 8.42 amu (25.4%), 10.25 amu (38.98), and 12.65 amu (35.79). What is

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An unknown element has isotopes with atomic masses and natural abundances as follows: 8.42 amu (25.4\%), 10.25 amu (38.98), and 12.65 amu (35.79). What is the avera itomic mass of the unknown element? Do not include units when typing your answer. Be sure not to round until your final answer and type your answer with 4 significant figures

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