Question

When iron metal reacts with oxygen, the reaction can form Fe2O3. Write a balanced chemical equation for this reaction, and find the number of moles of oxygen that are needed to form 6 mol of Fe2O3. Show your work.

Note: Remember to show all of the steps that you use to solve the problem. You can use the comments field to explain your work. Your teacher will review each step of your response to ensure you receive proper credit for your answer. (4 points)

Answer 1

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Answer 2

First Balance ecuation \[4Fe + 3O _{2} \rightarrow 2Fe _{2}O _{3}\]

Now you have \[4Fe + 3O _{2} \rightarrow 2Fe _{2}O _{3}\] ? ? 6mol



Stoichiometry of the sol. of Fe2O3 to O2 is 2:3. That is, for every 2 mols of Fe2O3 you will need 3 mols of O2.

So,
\[6molFe _{2}O _{3}X\left( \frac{ 3molO _{2} }{ 2molFe _{2}O _{3} } \right) = 9molO _{2}\]


You need 9 mols of O2 for 6 mols of Fe2O3.