The graphic organize about black and white color reflection.
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A) 10.0g of Iron is 
of Iron.
One mole of dihydrogen is required to form one mole of iron, hence you'll need
of dihydrogen.
B) Likewise : 2.50g of Iron is
of Iron, hence we'll need 
of Fe2O3.
One mole of dihydrogen is required to form one mole of iron, hence you'll need
B) Likewise : 2.50g of Iron is