Question

Iron(III)oxide reacts with carbon monoxide to produce iron and carbon dioxide
- How many moles of iron (Fe) are produced from 1.8 moles of iron(III)oxide (Fe2O3)?
- Using your answer from the question above, how many molecules of iron is present in
that number of moles ?

Answer 1

Answer:

- 3.6 moles Fe

- 2.2 x 10²⁴ molecules Fe

Explanation:

First, you need to create the balanced chemical equation.

The unbalanced equation:

Fe₂O₃ + CO -----> Fe + CO₂

Reactants: 2 iron, 4 oxygen, 1 carbon

Products: 1 iron, 2 oxygen, 1 carbon

The balanced equation:

Fe₂O₃ + 3 CO -----> 2 Fe + 3 CO₂

Reactants: 2 iron, 6 oxygen, 3 carbon

Products: 2 iron, 6 oxygen, 3 carbon

Now that we have the balanced equation, we can use the mole-to-mole ratio (from the equation coefficients) to convert from moles Fe₂O₃ to moles Fe.

1.8 moles Fe₂O₃           2 moles Fe
--------------------------  x  ----------------------  =  3.6 moles Fe
                                     1 mole Fe₂O₃

We can convert between moles and molecules using Avogadro's Number.

Avogadro's Number:

6.022 x 10²³ molecules = 1 mole

3.6 moles Fe         6.022 x 10²³ molecules
---------------------  x  -------------------------------------  =  2.2 x 10²⁴ molecules Fe
                                           1 mole