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
valentinak56 [21]
3 years ago
5

PCl3(g) + Cl2(g) ⇋ PCl5(g) Kc = 91.0 at 400 K. What is the [Cl2] at equilibrium if the initial concentrations were 0.24 M for PC

l3 and 1.50 M for Cl2 and 0.12 M PCl5.
Chemistry
1 answer:
Dmitry_Shevchenko [17]3 years ago
5 0

Answer:

[Cl₂] in equilibrium is 1.26 M

Explanation:

This is the equilibrium:

PCl₃(g) + Cl₂(g) ⇋ PCl₅(g)

Kc = 91

So let's analyse, all the process:

                PCl₃(g)        +        Cl₂(g)     ⇋        PCl₅(g)

Initially     0.24 M                 1.50M                 0.12 M

React           x                           x                         x

Some amount of compound has reacted during the process.

In equilibrium we have

              0.24 - x                  1.50 - x                  0.12 + x

As initially we have moles of product, in equilibrium we have to sum them.

Let's make the expression for Kc

Kc = [PCl₅] / [Cl₂] . [PCl₃]

91 = (0.12 + x) / (0.24 - x) ( 1.50 - x)

91 = (0.12 + x) / (0.36 - 0.24x - 1.5x + x²)          

91 (0.36 - 0.24x - 1.5x + x²) = (0.12 + x)

32.76 - 158.34x + 91x² = 0.12 +x

32.64 - 159.34x + 91x² = 0

This a quadratic function:

a = 91; b= -159.34; c = 32.64

(-b +- √(b² - 4ac)) / 2a

Solution 1 = 1.5

Solution 2 = 0.23 (This is our value)

So [Cl₂] in equilibrium is 1.50 - 0.23 = 1.26 M

You might be interested in
By what quantity must the heat capacity be divided to obtain the specific heat of that material
masha68 [24]
<span>Heat capacity of an object, is the amount of heat energy or thermal energy (unit: Joule) needed to raise the temperature of the object by 1 degree celsius. Unit of heat capacity is J/°C 

Larger object will surely need larger amount of thermal energy to raise its temperature. If you compare 1 litre of water with 0.5 litre of water, the 1L water will have two times the heat capacity. 

It will be more useful to compare specific heat capacity, because then it is the amount of heat energy or thermal energy (unit: Joule) needed to raise the temperature of 1 unit mass of the object by 1 degree celsius. You can then compare between 1 unit mass of water and 1 unit mass of iron. 
Water has higher specific heat capacity than iron, meaning that you need more energy to heat up 1kg of water, then to heat up 1kg of iron. 

The unit will then be J/(kg °C) or J/(g °C).
</span>
6 0
3 years ago
Write the balanced chemical equations of the following reaction: Hydrogen and oxygen react to form water.
timofeeve [1]
H2 + O = H2O
Hydrogen is a diatomic molecule and reacts with oxygen to create Water or H2O
4 0
3 years ago
What does promoters in chemical reaction improve ​
dolphi86 [110]

Answer:

Promoter, in chemistry, substance added to a solid catalyst to improve its performance in a chemical reaction. By itself the promoter has little or no catalytic effect. Some promoters interact with active components of catalysts and thereby alter their chemical effect on the catalyzed substance.

Explanation:

7 0
3 years ago
Which statement best describes the nuclear model of the atom. A) negative charges dispersed in a positively charged cloud B) pos
Svetradugi [14.3K]

Answer:

D.) small, dense negative nucleus surrounded by a diffuse positively charged cloud

Explanation:

I am not 100% sure but the reason I think this is the answer is because Protons and Neutrons are in the nucleus. Protons being positively charged and neutrons being negatively charged. Again, I do not know for sure, but I think D is the answer.

4 0
3 years ago
Two students are discussing weathering and erosion factors. Leah says that both weathering and erosion involve wind, water, and
Fed [463]

Answer:

I think Leah

Explanation: Tell me if this helps

8 0
2 years ago
Other questions:
  • If it take 20 second for 200cm3 of H25 to diffuse through a porovs pot,hours,long will it take 400cm3 of NH3 of diffuse under th
    14·1 answer
  • What determines how much thrust is generated in a solid fuel rocket engine at any given time?
    6·2 answers
  • The empirical formula of glucose is CH2O the molecular formula of glucose is 6 times than the empirical formula. what is the mol
    13·1 answer
  • Arrhenius base definition
    6·1 answer
  • If you have a 8.6 mol of AlCl3 in a 6.8 M solution, how many Liters does it make?
    11·1 answer
  • Nitrogen dioxide and water react to form nitric acid and nitrogen monoxide, like this:
    5·1 answer
  • 3.1
    7·1 answer
  • How many moles are in 4.35 X 1024 atoms of Iron (Fe)?
    7·1 answer
  • A drought hits the habitat of a semi-aquatic bird population. All ponds dry up, and fish populations decline. There are two grou
    10·1 answer
  • How many mols in 22.45g of water?
    15·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!