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masya89 [10]
3 years ago
7

According to the following balanced equation, 2 formula units of Iron (III) Oxide (Fe2O3) can be formed by reacting 4 atoms of i

ron (Fe) with 3 molecules of oxygen gas (O2). If 12 atoms of iron are reacted with 6 molecules of oxygen gas, which is the limiting reactant and how many atoms or molecules will be left over? 4Fe + 3O2 -> 2Fe2O3
Chemistry
2 answers:
-Dominant- [34]3 years ago
8 0
You have to use Avogadro's number (6.02x10^23 molecules/mole) to find the number of moles each reactant starts off with.
moles of Fe and O₂:
12 atoms/(6.02x10^23 atoms/mole)=1.99x10^-23 mol Fe
6 molecules/(6.02x10^23 molecules/mole)=9.967x10^-24 mol <span>O₂
</span>Then you find the limiting reagent by finding how much product each given amount of reactant can make.  Which ever one produces the least amount of product is the limiting reagent.
amount of Fe₂O₃ produced:
<span>(1.99x10^-23 mol Fe)x(2mol/4mol)= 9.967x10^-24mol Fe</span>₂O₃<span> 
</span>(9.967x10^-24 mol O₂)x(2mol/3mol)= 6.645x10^-24 mol Fe₂O₃<span> 
</span>since oxygen produces the leas amount of product, oxygen is the limiting reagent.  since we know that oxygen is the limiting reagent we can use the amount of product formed with oxygen to find the amount of iron used.
6.645x10^-24 mol Fe₂O₃x(4mol/2mol)=1.329x10^-23 mol Fe consumed
<span> find the amount left over by subtracting the original amount of Fe by the amount consumed in the reaction.
</span>1.993x10^-23-1.329x10^-23= 6.645x10^-23mol Fe left
 find the number of atoms by multiplying that by Avogadro's number.
<span>(6.645x10^-23mol)x(6.02x10^23 atoms/mol)=4 atoms
</span>therefore 4 atoms of Fe will be left over after the reaction happens.

I hope this helps.
Bogdan [553]3 years ago
7 0

<u>Answer:</u> The limiting reagent is Oxygen molecule and 4 atoms of Iron will be left over.

<u>Explanation:</u>

The given chemical equation is:

4Fe(s)+3O_2(g)\rightarrow 2Fe_2O_3(s)

By Stoichiometry of the reaction:

3 molecules of oxygen gas reacts with 4 atoms of iron.

So, 6 molecules of oxygen gas will react with = \frac{4}{3}\times 6=8 atoms of iron.

As, the required atoms of iron is less than the given atoms of iron. Therefore, it is present in excess and is considered as an excess reagent.

Hence, the limiting reagent is Iron atom because it limits the formation of product.

Atoms left remaining at the end of the reaction will be = 12 - 8 = 4 atoms.

Thus, the limiting reagent is Oxygen molecule and 4 atoms of Iron will be left over.

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