Fe2O3 + 3H2 - 2Fe + 3H2O How many moles of iron can be made from 3 g of Fe2O:?* A. 0.038 g
B. 12 g
C. 480 g
D. 6 g​

The atomic masses of C and O are 12 g/mol and 16 g/mol respectively.

The molar mass of CO is 12+16=28 g/mol.

56 g CO corresponds to

28

56

=2 moles.

As per balanced chemical equation, 1 mole of Fe

2

O

3

will react with 3 moles of CO.

Hence, 3.0 moles of Fe

2

O

3

will react with 3.0×3=9 moles of CO.

However only 2 moles of CO are present. Hence, CO is the limiting reagent and Fe

2

O

3

is excess reagent.

As per the balanced chemical equation, 3 moles of CO produces 2 moles of Fe.

Hence, 2 moles of CO will produce 2×

3

2

=12 g

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