Question

How many moles of fe2o3 will be produced from 18.0 g of fe assuming o2 is available in excess

Answer 1

0.161 moles of Fe₂O₃

Step-by-step explanation:

Given data:

Mass of Fe = 18g

Unknown:

Number of moles = Fe₂O₃

Solution:

The number of moles of a substance is given as:

Number of moles =
`(mass)/(molar mass)`

To solve this problem, we should understand that oxygen gas is given in excess and iron is the limiting reactant.

The equation of the reaction is given below;

4Fe + 3O₂ → 2Fe₂O₃

First, find the number of moles of the known specie which is iron;

Number of moles of Fe =
`(18)/(56)` = 0.32mole

From the balanced reaction equation;

4 moles of Fe will produce 2 moles of Fe₂O₃

0.32 moles of Fe will produce
`(0.32 x 2)/(4)` = 0.161 moles of Fe₂O₃