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Explanation:
1)Mass of CO when 210.3 g of Fe produced.
Number of moles of 
in 210.3 g=
According to reaction, 2 moles of Fe are obtained from 3 moles of CO, then 3.76 moles of Fe will be obtained from : 
of CO that is 5.64 moles.
Mass of CO in 5.64 moles =
2)Mass of CO when 209.7 g of Fe produced.
Number of moles of in 209.7 g=
According to reaction, 2 moles of Fe are obtained from 3 moles of CO, then 3.75 moles of Fe will be obtained from : 
of CO that is 5.625 moles.
Mass of CO in 5.625 moles =
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Answer:
(B) magnesium. .........,..
Cyclopentene is industrially produced in large quantities. It is used as a monomer for the synthesis of plastics, in addition to other chemical syntheses.
<h3>The 6‑step synthesis of the starting material from the product</h3>
Reaction 1 - Preparation of keto-aldehyde
Reaction 2 - Preparation of cyclopentene carbaldehyde
Reaction 3 -Preparation of α,β-epoxy-carbaldehyde cyclopentane
Reaction 4 - Preparation of cyclopentene alcohol
Reaction 5 -Preparation of α,β-epoxy-cyclopentane alcohol
Reaction 6 -Preparation of α,β-epoxy-carbaldehyde cyclopentane
With this information we can conclude that cyclopentene is used as a monomer for the synthesis of plastics.
Learn more about synthesis of plastics in brainly.com/question/13833034
