1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
masya89 [10]
2 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]2 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]2 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.

You might be interested in
What is largest value for the third quantum number
Kryger [21]

Answer:

18.

Explanation:

3s^2 3p^6 d^10

4 0
2 years ago
PLEASE ANSWER QUICK. Place in order from simplest (top) to most complex (bottom).
Marina86 [1]

Answer:

Cell

tissue

organ

organsystem

organism

6 0
3 years ago
Can anyone help me on this please?
Bad White [126]
This question is testing to see how well you understand the "half-life" of radioactive elements, and how well you can manipulate and dance around them.  This is not an easy question.

The idea is that the "half-life" is a certain amount of time.  It's the time it takes for 'half' of the atoms in any sample of that particular unstable element to 'decay' ... their nuclei die, fall apart, and turn into nuclei of other elements.

Look over the table.  There are 4,500 atoms of this radioactive substance when the time is 12,000 seconds, and there are 2,250 atoms of it left when the time is ' y ' seconds.  Gosh ... 2,250 is exactly half of 4,500 !  So the length of time from 12,000 seconds until ' y ' is the half life of this substance !  But how can we find the length of the half-life ? ? ?

Maybe we can figure it out from other information in the table !

Here's what I found:

Do you see the time when there were 3,600 atoms of it ? 
That's 20,000 seconds.

... After one half-life, there were 1,800 atoms left.
... After another half-life, there were 900 atoms left.
... After another half-life, there were 450 atoms left. 

==>  450 is in the table !  That's at 95,000 seconds.

So the length of time from 20,000 seconds until 95,000 seconds
is three half-lifes.

The length of time is (95,000 - 20,000) = 75,000 sec

                                     3 half lifes = 75,000 sec

Divide each side by 3 :   1 half life = 25,000 seconds

There it is !  THAT's the number we need.  We can answer the question now.

==> 2,250 atoms is half of 4,500 atoms.

==> ' y ' is one half-life later than 12,000 seconds

==> ' y ' = 12,000 + 25,000

         y   = 37,000 seconds  .

Check: 
Look how nicely 37,000sec fits in between 20,000 and 60,000 in the table.

As I said earlier, this is not the simplest half-life problem I've seen.
You really have to know what you're doing on this one.  You can't
bluff through it.


7 0
3 years ago
Which of the following best describes the impact of glaciers upon the surface of the earth?
Ahat [919]

Answer:

D. All of the above

Explanation:

Because all of these have something to do with how glaciers are affecting the planet.

6 0
3 years ago
2
nignag [31]

Answer:

D

Explanation:

I think it is D. Think about it- if a human jumps, they are less than the gravitational force. But, if you are greater than the gravitational force, I think you will go into space.

4 0
3 years ago
Other questions:
  • Type the correct answer in each box. In an atom, the first energy level can hold electrons. The second energy level can hold ele
    8·1 answer
  • In a balloon with a volume of 21.55 cups, what is the volume of this balloon in L?
    12·1 answer
  • Describe the motion of the tiny particles that make up matter.
    14·1 answer
  • If there are no changes in the oxidation state of the reactants or products of a particular reaction, that reaction is not a red
    5·1 answer
  • If 13.6 kilograms of al2o3 51.4 kilograms of naoh and 51.4 kilograms of hf react completely, how many kilograms of cryolite will
    11·1 answer
  • The second reaction in the formation of sulfuric acid occurs slowly.
    15·1 answer
  • ____ occurs when the vapor pressure of a liquid is equal to the external atmospheric pressure.
    10·2 answers
  • The larger the wavelength the shorter the frequency.<br> True or false
    7·2 answers
  • A cheetah has been clocked at 112 km/hr. what is this speed in m/s?
    14·2 answers
  • Covert from scientific notation<br> 1.3 x 10¹²=
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!