Question

In 1901, Thomas Edison invented the nickel-iron battery. The follwing reaction takes place in the battery.

Answer 1

Answer: The number of moles of $Fe(OH)_2$  produced are, 3.60 moles.

Explanation :

First we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

$Fe(s)+2NiO(OH)(s)+2H_2O(l)\rightarrow Fe(OH)_2(s)+2Ni(OH)_2(aq)$

From the balanced reaction we conclude that

As, 1 mole of $Fe$ react with 2 mole of $NiO(OH)$

So, 3.60 moles of $Fe$ react with $3.60\times 2=7.2$ moles of $NiO(OH)$

From this we conclude that, $NiO(OH)$ is an excess reagent because the given moles are greater than the required moles and $Fe$ is a limiting reagent and it limits the formation of product.

Now we have to calculate the moles of $Fe(OH)_2$

From the reaction, we conclude that

As, 1  mole of $Fe$ react to give 1 mole of $Fe(OH)_2$

So, 3.60 mole of $Fe$ react to give 3.60 mole of $Fe(OH)_2$

Therefore, the number of moles of $Fe(OH)_2$  produced are, 3.60 moles.