Chemistry, 06.10.2019 07:11, kberly3750ovgw6f

According to the following balanced equation, 2 formula units of iron (iii) oxide (fe2o3) can be formed by reacting 4 atoms of iron (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

Answers: 2

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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 O₂
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:
(1.99x10^-23 mol Fe)x(2mol/4mol)= 9.967x10^-24mol Fe₂O₃
(9.967x10^-24 mol O₂)x(2mol/3mol)= 6.645x10^-24 mol Fe₂O₃
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
find the amount left over by subtracting the original amount of Fe by the amount consumed in the reaction.
1.993x10^-23-1.329x10^-23= 6.645x10^-23mol Fe left
find the number of atoms by multiplying that by Avogadro's number.
(6.645x10^-23mol)x(6.02x10^23 atoms/mol)=4 atoms
therefore 4 atoms of Fe will be left over after the reaction happens.

I hope this helps.

answered: ken3484

The limiting reagent is Oxygen molecule and 4 atoms of Iron will be left over.

Explanation:

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.

answered: Guest

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.

answered: Guest

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.

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According to the following balanced equation, 2 formula units of iron (iii) oxide (fe2o3) can be for...