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$$2Fe + 6HCl → 2FeCl_3+ 3H_2$$

If 200 atoms of iron are available for the reaction shown above, how many molecules of $H_2$ will be formed assuming there is an excess amount of $HCl$ for the reaction?

A

$200$

B

$600$

C

$300$

D

$800$

E

$500$

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