Question

Nickel-Iron Battery

In1901, Thomas Edison invented the nickel-iron battery. The following reaction takes place in the battery.
Fe(s) + 2NiO(OH)(s) + 2H2O(1) —> Fe(OH)2(s) + 2Ni(OH)2(aq)
How many mol of Fe (OH)2 is produced when 5.00 mol of Fe and 8.00 mol of NiO(OH) react?

Answer 1

4.0 moles of Fe(OH)₂.

Step-by-step explanation:

• It is a stichiometry problem.

• The balanced equation: Fe + 2NiO(OH) + 2H₂O → Fe(OH)₂ + 2Ni(OH)₂,

• It is clear that 1.0 mole of Fe reacts with 2.0 moles of NiO(OH) and 2.0 moles of H₂O to produce 1.0 mole of Fe(OH)₂ and 2.0 moles of Ni(OH)₂.

• The given data: 5.00 moles of Fe reacts with 8.00 mol of NiO(OH).

• From the stichiometry; 4.0 moles of Fe (1.0 mole will be in excess) reacts completely with 8.0 moles of NiO(OH) and produce 4.0 moles of Fe(OH)₂.

Answer 2

The answer is: 4.00 mol of Fe(OH)2 is produced.

Balanced chemical reaction:

Fe(s) + 2NiO(OH)(s) + 2H₂O(l) → Fe(OH)₂(s) + 2Ni(OH)₂(aq).

n(Fe) = 5.00 mol; amount of iron.

n(NiO(OH)) = 8.00 mol; amount of nickel oxide hydroxide, limiting reactant.

From chemical reaction: n(NiO(OH)) : n(Fe(OH)₂) = 2 : 1.

n(Fe(OH)₂) = 8 mol ÷ 2.

n(Fe(OH)₂) = 4 mol; amount of iron(II) hydroxide.