Question

Select the correct answer. A chemist is working on a reaction represented by this chemical equation: FeCl2 2KOH → Fe(OH)2 2KCl. If the chemist uses 4. 15 moles of iron(II) chloride and 3. 62 moles of potassium hydroxide, how many moles of iron(II) hydroxide will the reaction produce? A. 1. 81 mol B. 3. 62 mol C. 4. 15 mol D. 7. 24 mol.

Answer 1

Moles are the proportion of the mass of the substance and that of the molar mass of the substance. The number of moles of iron (II) hydroxide will be 1.81 mol.

What is a mole?

A mole is the measuring unit of the chemistry that measures even the small number of atoms, molecules and ions of the given compound. It can be given as the division of the mass from the molar mass.

The balanced chemical reaction can be shown as:

$\rm FeCl_{2} + 2KOH \rightarrow Fe(OH)_{2} + 2KCl$

In the question, the number of the moles of iron (II) chloride is 4.15 mol and of potassium hydroxide is 3.62 mol.

From the reaction, it can be said that the ratio of the moles of potassium hydroxide and iron (II) hydroxide is 2:1.

The number of moles of iron (II) hydroxide is calculated as:

$\begin{aligned}\rm n(Fe(OH)_{2}) &=\rm \dfrac{n(KOH)}{ 2}\\\\&= \dfrac{3.62}{2}\\\\&= 1.81 \;\rm mol\end{aligned}$

Therefore, option A. 1.81 mol is the moles of iron (II) hydroxide that will be produced.

Learn more about moles here:

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