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Chemistry, 07.11.2019 02:31 idk9329

If selenium (se) is 0.89% se-74, 9.36%
se-76, 7.63% se-77, 23.78% se-78,
49.61% se-80, and 8.73% is se-82,
what is the average atomic mass of se?

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If selenium (se) is 0.89% se-74, 9.36%
se-76, 7.63% se-77, 23.78% se-78,
49.61% se-80, a...
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