Answered: Write answers to these using mental…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter17: Electrochemistry And Its Applications

Section17.11: Counting Electrons

Problem 17.16CE

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Question

Write answers to these using mental math (without a calculator). Based on the balanced equation: 4 Fe + 3 O2 → 2 Fe2O3 1. To form four units of Fe2O3 , a. How many atoms of Fe are used?____________ b. How many molecules of O2 are needed?____________

Expert Solution

Step 1

A chemical equation represents the reactants and products participating in a chemical reaction.

Step 2

Consider the balanced reaction.

$4 Fe + 3 O_{2} \to 2 {Fe}_{2} O_{3}$

It is clear that 4 moles of Fe reacts with 3 moles of $O_{2}$ to form 2 moles of ${Fe}_{2} O_{3}$ .

Calculate the number of moles of Fe reacts to form 4 moles of ${Fe}_{2} O_{3}$ .

$\begin{array}{rcl} n (Fe) & = & 4 mol \times \frac{4 mol}{2 mol} \\ = & 8 mol \end{array}$

So, the number of moles of Fe are 8 mol.

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