Question

Iron can be obtained by reduction of iron oxide $(Fe_{3}O_{4})$ with CO according to the reaction:

$Fe_{3}O_{4} + 4CO \rightarrow 3Fe + 4CO_{2}$

How many Kg of $Fe_{3}O_{4}$ should be heated with CO to get 3 kg of iron?

• A. $8.12kg$
• B. $4.14kg$
• C. $6.94kg$
• D. $16.8Kg$

Answer 1

Answer: (B)

$4.14kg$

Answer 2

(2) : $\underset{232g}{Fe_{3}O_{4}} + 4CO \rightarrow \underset{56 \times 3 = 168g}{3Fe} + 4CO_{2}$

3 moles of Fe is produced from 1 mole of $Fe_{3}O_{4}$

168 g of Fe is produced from 232 g of $Fe_{3}O_{4}$

3 kg of Fe will be produced from $\frac{232}{168} \times 3000$

=4142.8 g

Or $4.14$kg of $Fe_{3}O_{4}$