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
Schach [20]
3 years ago
11

At a particular temperature, Kp = 0.25 for the following reaction.

Chemistry
2 answers:
nalin [4]3 years ago
4 0
The reaction is
N₂O₄(g)  <=>  2NO₂(g)

a. Initial pressure is 5.3 atm
We assume that the there is 1 mole at the start
N₂O₄(g)  <=>  2NO₂(g)
    1                 
   -x                   2x
---------------------------
1 - x                   2x
The total moles is
1 + x
The mole fraction of N2O4 is
(1 - x)/(1 + x)
The mole fraction of NO2
2x/(1 + x)

Kp = [2x/(1 + x)]² / [(1 - x)/(1 + x)] = 0.25
Solve for x
And the total number of moles
The total pressure is solved by
(1 + x) (5.3)

The partial pressure of N2O4 is
5.3 (1 - x)
The partial pressure of NO4 is
5.3 (2x)

Do the same for the second problem.
Arisa [49]3 years ago
3 0

Answer:

See explanation below

Explanation:

Let's write the equation:

N₂O₄(g) <------> 2NO₂(g)    Kp = 0.25

The general expression for Kp for this reaction is:

Kp = pNO₂²/pN₂O₄ (1)

With these expression we will calculate the partial pressure of the gases. Now, let's solve this by parts:

<u>a) When pN₂O₄ = 5.3 atm</u>

In this case, we'll do an ICE chart of this reaction:

        N₂O₄(g) <------> 2NO₂(g)

i)         5.3                      0

c)         -x                     +2x

e)      5.3 - x                  2x

Replacing into (1) we have:

0.25 = (2x)² / (5.3 - x)

From here, we solve for x:

0.25(5.3-x) = 4x²

1.325 - 0.25x = 4x²

4x² + 0.25x - 1.325 = 0

Now, we use the general expression for calculate x in these conditions:

x = -b ±√b² - 4ac / 2a   (2)

Replacing the data here:   (a = 4; b = 0.25; c = -1.325)

x = -0.25 ±√(0.25)² - 4*4*(-1.325) / 2*4

x = -0.25 ±√21.2625 / 8

x = -0.25 ± 4.61 / 8

x1 = -0.25 + 4.61 / 8 = 0.55

x2 = -0.25 - 4.61 / 8 = -0.61

So, we take the positive value.

x = 0.55 atm

Therefore the partial pressure of the gases are:

pN₂O₄ = 5.3 - 0.55 = 4.75 atm

pNO₂ = 2 * 0.55 = 1.10 atm

<u>b) When pNO₂ = 7 atm</u>

In this part we do the same but with NO2 so:

        N₂O₄(g) <------> 2NO₂(g)

i)         0                         7

c)         +x                     +2x

e)        x                      7 - 2x

replacing in (1):

0.25 = (7-2x)²/x

0.25x = 4x² - 28x + 49

4x² - 28.25x + 49 = 0

Using (2):

x = 28.25 ±√(28.25)² - 4*4*49 / 2*4

x = 28.25 ±√14.0625 / 8

x = 28.25 ± 3.75 / 8

x1 = 28.25 + 3.75 / 8 = 4

x2 = 28.25 - 3.75 / 8 = 3.0625

We can use either of the two values, but 2x is 2*4 = 8, it's higher than 7, and the result would be a negative number, so we use the smaller number, x2 will be the one:

pNO₂ = 7 - (2*3.0625) = 0.8744 atm

pN₂O₄ = 4.0625 atm

You might be interested in
Explain why the catalyst is used as a very fine powder and larger pieces of iron are not used.
Allushta [10]

Answer:

<h2><u>Reason:</u></h2>

Catalyst is used as a very fine powder and larger pieces of iron are not used. This is because the surface area of catalyst needs to be large so that more of the surface is exposed to the substrate and more of the substrate is catalyzed.

<h2><u>Important Info:</u></h2>

=> Larger Pieces of Iron has a smaller surface area than the fine particles.

=> Larger the surface area of catalysts/enzymes , more will be the reaction rate and vice versa.

Hope this helped!

<h2>~AnonymousHelper1807</h2>

7 0
3 years ago
What is the molarity of a solution that contains 0.220 moles KOH in 0.350 L of solution?
Lera25 [3.4K]

Answer:

0.628 M.

Explanation:

In order to solve this problem we need to keep in mind the<em> definition of molarity</em>:

  • Molarity = moles / liters

We are given both the <em>number of moles and the volume of solution</em>, meaning we can now proceed to <u>calculate the molarity</u>:

  • Molarity = 0.220 mol / 0.350 L
  • Molarity = 0.628 M
5 0
3 years ago
What is the half-life (in seconds) of a zero-order reaction which has an initial reactant concentration of 0.884 M with a k valu
pantera1 [17]
<span>Answer: 8.15s
</span><span />

<span>Explanation:
</span><span />

<span>1) A first order reaction is that whose rate is proportional to the concenration of the reactant:
</span><span />

<span>r = k [N]
</span><span />

<span>r = - d[N]/dt =
</span><span />

<span>=> -d[N]/dt = k [N]
</span><span />

<span>2) When you integrate you get:
</span><span />

<span>N - No = - kt
</span>
<span></span><span /><span>
3) Half life => N = No / 2, t = t'
</span><span />

<span>=> No - No/ 2 = kt' => No /2 = kt' => t' = (No/2) / k
</span><span />

<span>3) Plug in the data given: No = 0.884M, and k = 5.42x10⁻²M/s
</span>
<span /><span /><span>
t' = (0.884M/2) / (5.42x10⁻²M/s) = 8.15s</span>
6 0
3 years ago
Read 2 more answers
Give an example of change that includes more than one change​
bogdanovich [222]

Answer:

candle.

Explanation:

Candle has more than one change chemical and physical.

6 0
3 years ago
What organisms appeared on Earth First?
dusya [7]
It is B because horn coals are bigger and I read it in a book
5 0
3 years ago
Other questions:
  • What forms of matter exists that are not made of chemical bonds?
    13·1 answer
  • HHHHEEELLLPPPP PLZ ANd thanks mfs .
    14·1 answer
  • Quarks are thought to be the building blocks of protons. Which was most affected by the discovery of the quark?
    8·2 answers
  • In the spectrophotometric analysis of benzene, the calibration curve has a slope of 195 AU/M and an intercept of 0.079 AU. If an
    10·1 answer
  • amount of energy released, which is represented by the ccc Energy and Matter the surface of the sun is at a temperature of about
    5·1 answer
  • Explain clearly what is meant by the statement "The atomic mass of gold is 197.0 amu."
    11·1 answer
  • Molecules have Question 8 options: A) only kinetic energy. B) neither kinetic nor potential energy. C) only potential energy. D)
    9·1 answer
  • How many chloride ions are in a 220 grams of calcium chloride?
    12·1 answer
  • Describe two physical properties of matter and how those properties are measured.
    5·1 answer
  • Flammable liquids are those that have a flashpoint of:.
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!