Question

How many moles of aluminum are needed to react completely with 1.2 mol of feo

Answer 1

Answer:

• 0.80 mol Al

Explanation:

1) Word reaction:

• Aluminum + ferrous oxide → aluminum oxide + iron

This is a single replacement reaction, in which aluminum, a more acitve metal than iron, replaces the iron in the ferrous oxide to form aluminum oxide and iron.

2) Skeleton chemical equation:

• Al + FeO → Al₂O₃ + Fe

3) Balanced chemical equation:

Add the coeffcients to comply with the law of conservation of mass:

• 2Al + 3FeO → Al₂O₃ + 3Fe

4) Mole ratio of Al and FeO:

• 2 mol Al : 3 mol FeO

5) Set a proportion with the unkown and solve:

• x / 1.2 mol FeO = 2 mol Al / 3 mol FeO

• x = 1.2 mol FeO × 2 mol Al / 3 mol FeO = 0.80 mol Al ← answer