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Manganese trifluoride can be prepared by...

Manganese trifluoride can be prepared by the reaction:
`MnI_(2(s))+13//2F_(2(g))rarrMnF_(3)+2IF_(5)`
What is the minimum amount of `F_(2)` that must be used to react with `12 g` of `MnI_(2)` if only `75% F_(2)` is utilized to convert all of `MnI_(2)` to `MnF_(3)`?

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The correct Answer is:
`12.78g`;
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