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
andrey2020 [161]
3 years ago
6

Iron metal reacts with elemental oxygen to form rust according to the unbalanced reaction, Fe(s) + O2(g) → Fe2O3(s),. What is th

e coefficient of the iron(III) oxide, Fe2O3(s), in the balanced reaction?
a
1
b
2
c
3
d
4
Time left for this assessment:
50:27
Chemistry
1 answer:
pochemuha3 years ago
3 0

Answer:

c. 3

Explanation:

The unbalanced reaction expression is given as:

          Fe  +  O₂  →   Fe₂O₃  

To balance the expression gives the coefficient of oxygen.

Assign the coefficients a,b, c and use a mathematical approach to solve this problem:

             aFe  +  bO₂  →  cFe₂O₃

Conserving Fe: a  = 2c

                    O:  2b  = 3c

Now let c = 1, a  = 2, b  = \frac{3}{2}

  Multiply through by 2,

             a = 4, b = 3 and c  = 2

 

               4Fe  +  3O₂  →   2Fe₂O₃  

The coefficient of O₂ is 3

You might be interested in
How many grams of solute are in 1.00 liter of 0.200m na2so4 solution?
Kisachek [45]
Molarity can be defined as the number of moles of solute in 1 L solution.
Molarity of Na₂SO₄ solution - 0.200 M
this means there are 0.200 moles in 1 L solution 
Molar mass of Na₂SO₄ - 142 g/mol 
therefore mass of Na₂SO₄ in 1.00 L - 0.200 mol x 142 g/mol = 28.4 g
a mass of 28.4 g of Na₂SO₄ is present in 1.00 L
7 0
3 years ago
What do you mean by antibodies​
eduard
Ans: a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.
8 0
3 years ago
How do I identify significant figures in chemistry?
Komok [63]
1) START counting for sig. figs. On the FIRST non-zero digit.

2) STOP counting for sig. figs. On the LAST non-zero digit.

3) Non-zero digits are ALWAYS significant.

4) Zeroes in between two non-zero digits are significant. All other zeroes are insignificant.

3 0
3 years ago
Write the NET IONIC EQUATION between iron and copper (II) sulfate.
ratelena [41]

<u>Answer:</u> The net ionic equation is written below.

<u>Explanation:</u>

Net ionic equation of any reaction does not include any spectator ions.

Spectator ions are defined as the ions which does not get involved in a chemical equation. They are found on both the sides of the chemical reaction when it is present in ionic form.

The chemical equation for the reaction of iron and copper (II) sulfate is given as:

Fe(s)+CuSO_4(aq.)\rightarrow FeSO_4(aq.)+Cu(s)

Ionic form of the above equation follows:

Fe(s)+Cu^{2+}(aq.)+SO_4^{2-}(aq.)\rightarrow Fe^{2+}(aq.)+SO_4^{2-}(aq.)+Cu(s)

As, sulfate ions are present on both the sides of the reaction. Thus, it will not be present in the net ionic equation and are spectator ions.

The net ionic equation for the above reaction follows:

Fe(s)+Cu^{2+}(aq.)\rightarrow Fe^{2+}(aq.)+Cu(s)

Hence, the net ionic equation is written above.

7 0
3 years ago
What unit do we use to measure work?<br><br> A Grams<br> B joules <br> C Newton’s
vladimir1956 [14]

Answer:

B

Explanation:

4 0
3 years ago
Other questions:
  • 0.0145 moles of helium gas are introduced into a balloon so that the volume of the balloon is 2.54 liters. An additional amount
    15·1 answer
  • In the following equation, which compounds are the reactants?NaCl + AgNO → NaNO + AgCl
    5·2 answers
  • What intermolecular force involves non polar molecules
    8·1 answer
  • . A golfer hits a golf ball with a club. The mass of the ball is 0.05 kg. The ball accelerates at 2,000 m/s2. What is the net fo
    14·1 answer
  • Select the three characteristics that best describe a STEM-educated student.
    12·2 answers
  • What is the density of mass=108g volume=5.64cm3
    11·1 answer
  • Water ionizes because: Select one: The smaller electronegative oxygen atom strips the electron from one of its hydrogen atoms, l
    8·1 answer
  • Why does nitrogen have the lowest volume in the atmosphere on average?
    10·1 answer
  • In which direction does the wind blow from during a sea breeze
    11·1 answer
  • During a dilution, what happens to the concentration of a solution?
    11·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!