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What weight of CO is required to form Re...

What weight of CO is required to form `Re_(2)(CO)_(10)` from 2.50 g fo f`Re_(2)O_(7)` according to the unbalanced reaction:
`Re_(2)O_(7) + CO rarr Re_(2)(CO)_(10)+CO_(2)`
(Re =186 ,C =12 and O=16).Give your answer to the nearest integar.

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