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
Crank
3 years ago
12

What is the value for ∆Soreaction for the following reaction, given the standard entropy values? Fe2O3(s) + 3H2(g) 2 Fe(s) + 3H2

O(g) +138 J/K -138 J/K +5 J/K -5 J/K 189 J/K
Chemistry
1 answer:
grandymaker [24]3 years ago
8 0
Answer: 138 J/K

Explanation:

1) ΔS reaction = ΔS products - ΔS reactants

2) ΔS products = 2ΔS Fe(s) + 3 ΔS H₂O (g)


3) ΔS reactants = ΔS Fe₂O₃ (s) + 3 ΔS H₂ (g)


4) Now you have to search the standard entropy values for each product and each reactant in a table.

I found these values at 25° and 1 bar.


ΔS H₂O = 188.8 J/Kₓmol
ΔS Fe(s) = 27.3 J/Kmol

ΔS Fe₂O₃ (s) = 87.4 J/Kmol
ΔS H₂ (g) = 130.7 J/Kmol

5) Replace those values into above equations:

      ΔS products = 2ΔS Fe(s) + 3ΔS H₂O (g) = 
      2 mol × 27.3 J/K×mol + 3 mol ×188.8 J/K×mol = 621.0 J/K


      ΔS reactants = ΔS Fe₂O₃ (s) + 3 ΔS H₂ (g) =
      1mol × 87.4 J/K×mol + 3×130.7 J/K×mol = 479.5 J/K

      ΔS reaction = 621.0 J/K - 479.5 J/K = 141.5 J/K


Taking into account the differences in the values from different sources (specially due to the temperature), you can consider that the value 141.5 J/K is pretty much close to 138 J/K, and take that answer.
You might be interested in
An atom has eight protons and nine neutrons. draw the atomic structure of the atom
Cloud [144]
Draw eight circles and nine more in a big circle = this represents your nucleus
draw eight electrons (since electrons = protons in neutral elements) outside of it (2 in one ring, then 6 in a second ring)
7 0
2 years ago
The 500kg concrete culvert has a mean radius of 0.5m. part a if the truck has an acceleration of 3m/s2, determine the culvert's
jarptica [38.1K]

<u>Given: </u>

Radius of culvert, r = 0.5 m

Tangential acceleration of the truck, a = 3 m/s2

<u>To determine:</u>

The angular acceleration, α

<u>Explanation:</u>

The tangential acceleration is related to the angular acceleration through the radius as:

a = rα

α = a/r = 3 ms⁻²/0.5 m = 6 s⁻²

Ans: The angular acceleration is 6 s⁻²


6 0
3 years ago
A sample of nitrogen gas occupies a volume of 1.40L at 297K with a pressure of 776mmHg. The volume increases to 2.70L and the te
konstantin123 [22]

Hey it isnt letting me submit my answer to your question on the Japanese chart, so imma just submit it here

6 0
3 years ago
Identify the variables in this hypothesis. If the pressure of a gas is increased, then the volume will decrease because the part
Kaylis [27]
Volume<span> of matter </span>decreases<span> under </span>pressure<span> ... -under </span>pressure<span>, the </span>particles<span> in a </span>gas<span> are </span>forced closer together<span> ... </span>factors<span> affecting </span>gas pressure<span> ... -</span>if pressure<span> in a sealed container is </span>lower than<span> outside, </span>gas will<span> rush in ...</span>
7 0
3 years ago
Read 2 more answers
Can aromatic compounds belong to other classes of compounds?
Elena L [17]
They certainly can. However, they have other groups that are used to classify a compound.
8 0
3 years ago
Other questions:
  • In a 200 cm3 container, a certain amount of O2 gas is held with a piston at equilibrium with the external pressure being 1 bar.
    5·1 answer
  • Which of the following elements would be best to use to make wires that conduct heat?
    7·1 answer
  • Relationship between the variables of Pressure and Temperature of a gas?
    5·1 answer
  • 18. How many milliliters of water at 23 °C with a density of 1.00 g/mL must be mixed with 180 mL (about 6 oz) of coffee at 95 °C
    8·1 answer
  • determine the type of the following chemical reaction: Mg(s) + 2HCl(aq)——-&gt; H2(g) + MgCl2(aq) a. single replacement reaction
    5·1 answer
  • If the initial pressure of a gas is 1.0 atm at 273k what is the new volume at 200k
    8·1 answer
  • Plzzzzzzzzzzzzzzzz help
    10·2 answers
  • What property of water is primary for living organisms? (SC.6.E.7.4) *
    13·2 answers
  • Write the chemical formula of the following compounds <br>​
    7·1 answer
  • NH4Cl + AgNO3 → AgCl + NH4NO3
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!