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
What are abiotic factors of the ecosystem​
dalvyx [7]

Answer:

Abiotic factors are the non-living components of the ecosystem, including its chemical and physical factors.

<em><u>Hope</u></em><em><u> this</u></em><em><u> helps</u></em><em><u>.</u></em>

7 0
2 years ago
Read 2 more answers
Which element had the longest effect on human history?
Dovator [93]
Oxygen I guess :)))       

6 0
3 years ago
Gaseous methane will react with gaseous oxygen to produce gaseous carbon dioxide and gaseous water . Suppose 9.6 g of methane is
lianna [129]

Answer:

21.6 g

Explanation:

The reaction that takes place is:

  • CH₄ + 2O₂ → CO₂ + 2H₂O

First we<u> convert the given masses of both reactants into moles</u>, using their <em>respective molar masses</em>:

  • 9.6 g CH₄ ÷ 16 g/mol = 0.6 mol CH₄
  • 64.9 g O₂ ÷ 32 g/mol = 2.03 mol O₂

0.6 moles of CH₄ would react completely with (2 * 0.6) 1.2 moles of O₂. As there are more O₂ moles than required, O₂ is the reactant in excess and CH₄ is the limiting reactant.

Now we <u>calculate how many moles of water are produced</u>, using the <em>number of moles of the limiting reactant</em>:

  • 0.6 mol CH₄ * \frac{2molH_2O}{1molCH_4} = 1.2 mol H₂O

Finally we<u> convert 1.2 moles of water into grams</u>, using its <em>molar mass</em>:

  • 1.2 mol * 18 g/mol = 21.6 g
4 0
2 years ago
On a graph, which type of line shows a direct proportion?
leonid [27]
Direct Proportion and The Straight Line Graph.Straight<span> line graphs that go through the origin, like the one immediately below, show that the quantities on the graph are in direct proportion.
thanks 
cbuck763

</span>

8 0
3 years ago
Calculate the number of grams of nitrogen dioxide that are produced from 4 moles of nitric oxide
miv72 [106K]

Answer:

hope this help by the way found off of yahoo

Explanation:

Calculate the number of grams of nitrogen dioxide that are produced from

4 moles of nitric oxide.

2NO(g) + O2(g) -->2NO2(g)

I really need help with this... I need to know how to work it too... I can balance it out but not sure about grams...  This is it balanced out with 4 moles of nitric oxide

4NO(g) + 2O2(g) ->4NO2(g) please help and explain i want to learn this

6 0
3 years ago
Other questions:
  • Choose the statement that correctly describes the diagram. A. Side B has a higher concentration of particles than side A. B. The
    12·2 answers
  • What is the number of carbon atoms in the ring portion of the haworth structure of glucose?
    15·1 answer
  • The titration of 25.0 ml of an iron(ii) solution required 18.0 ml of a 0.205 m solution of dichromate to reach the equivalence p
    9·1 answer
  • Which organism can reach 50 meters in size
    13·1 answer
  • How many molecules are in 120 grams of Na2SO4
    13·1 answer
  • What is Keystone XL pipeline?
    7·1 answer
  • Tick (√) the statements that are correct.
    9·1 answer
  • How do i find a ionic formula? <br><br>for example Ca2+ &amp; S2-​
    13·1 answer
  • What product is obtained from the reaction of sulfuric acid acetic acid and 1 pentanol.
    9·1 answer
  • As a pilot is flying in level flight at 9,500 ft, the altimeter in the instrument panel is set to a pressure of 29.48 mm of Hg.
    14·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!