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
sertanlavr [38]
3 years ago
10

Consider the following reaction where Kc = 6.50×10-3 at 298 K: 2NOBr(g) 2NO(g) + Br2(g) A reaction mixture was found to contain

9.83×10-2 moles of NOBr(g), 5.44×10-2 moles of NO(g), and 4.13×10-2 moles of Br2(g), in a 1.00 liter container. Is the reaction at equilibrium? If not, what direction must it run in order to reach equilibrium? The reaction quotient, Qc
Chemistry
1 answer:
Aleks [24]3 years ago
8 0

Answer:

This reaction isn't yet at an equilibrium. It must shift in the direction of the reactant (namely \rm NOBr\; (g)) in order to reach an equilibrium.

For this mixture, the reaction quotient is Q_c = 0.0126.

Explanation:

A reversible reaction is at equilibrium if and only if its reaction quotient Q_c is equal to the equilibrium constant K_c.

Start by calculating the equilibrium quotient Q_c of this reaction. Given the reaction:

\rm 2\; NOBr\; (g) \rightleftharpoons 2\; NO\; (g) + Br_2\; (g).

Let [\mathrm{NOBr\; (g)}], [\mathrm{NO\; (g)}], and [\mathrm{Br_2\; (g)}] denote the concentration of the three species. The formula for the reaction quotient of this system will be:

\displaystyle Q_c = \frac{[\mathrm{NO\; (g)}]^2 \cdot [\mathrm{Br_2\; (g)}]}{[\mathrm{NOBr\; (g)}]^2}.

(Note, that in this formula, both [\mathrm{NO\; (g)}] and [\mathrm{NOBr\; (g)}] are raised to a power of two. That corresponds to the coefficients in the balanced reaction.)

Calculate the reaction quotient given the concentration of each species:

\displaystyle Q_c = \frac{[\mathrm{NO\; (g)}]^2 \cdot [\mathrm{Br_2\; (g)}]}{[\mathrm{NOBr\; (g)}]^2} \approx 1.26\times 10^{-2} = 0.0126.

(Note that the unit is ignored.)

Apparently, Q_c > K_c. Since Q_c and K_c are not equal, this reaction is not at an equilibrium. If external factors like temperature stays the same,

Keep in mind that Q_c denotes a quotient. To reduce the value of a quotient, one may:

  • reduce the value of the numerator,
  • increase the value of the denominator, or
  • both.

In Q_c, that means reducing the concentration of the products while increasing the concentration of the reactants. In other words, the system needs to shift in the direction of the reactants before it could reach an equilibrium.

You might be interested in
Which of the following reactions is a neutralization reaction? A. ZnCl2(aq) + CaCrO4(aq) → ZnCrO4(s) + CaCl2(aq) B. HNO3(aq) + L
g100num [7]
Neutralization reaction means the reactants must be one acid and one alkali, and the product will be H2O and metal salt.

The only one satisfying this will be B
3 0
3 years ago
As much sugar as will dissolve is added to hot water. The water is then
Katen [24]
The answer is C because it says describe the final sugar and C is unsaturated and in the problem it says as much as sugar will dissovle .
8 0
3 years ago
38.9% de Bario, 29.4% de Cr y 31.7% de o
Kay [80]

Answer:

jjiooyfffffffffffcvģg5fffvgvvvhh

Explanation:

jhhhhuxjcififigigivigviigiggivi

3 0
2 years ago
What atom has 8 protons and 10 electrons?
Lorico [155]

Answer:

In your case, you have 8 protons and 10 electrons. This means that the atom will carry a total 2 xx (1-) = 2- net charge. Therefore, you are dealing with an anion that carries a 2- net charge, i.e. it has two more electrons than it does protons.

8 0
3 years ago
Read 2 more answers
What are the observable indicators that can be evidence a chemical change might have occurred?
kozerog [31]

solution:

The four observations that indicate a chemical change are:  

1) Precipitate is formed  

2) Odour  

3) Heat is emitted ( change in temperature)  

4)Formation of a Gas

Changes of state may of course be merely physical—as for example when liquid water is boiled to form a vapor. (These and other examples of physical changes resulting from temperature changes are discussed in the essays on Properties of Matter; Temperature and Heat.) The vapor produced by boiling water, as noted above, is still water; on the other hand, when liquid water is turned into the elemental gases hydrogen and oxygen, a more profound change has occurred.  

Likewise the addition of liquid potassium chromate (K2CrO4) to a solution of barium nitrate (Ba[NO3]2 forms solid barium chromate (BaCrO4). In the reaction described, a solution is also formed, but the fact remains that the mixture of two solids has resulted in the formation of a solid in a different solution. Again, this is a far more complex phenomenon than the mere freezing of water to form ice: here the fundamental properties of the materials involved have changed.  

The physical change of water to ice or steam, of course, involves changes in temperature; likewise, chemical changes are often accompanied by changes in temperature, the crucial difference being that these changes are the result of alterations in the chemical properties of the substances involved. Such is the case, for instance, when wood burns in the presence of oxygen: once wood is turned to ash, it has become an entirely different mixture than it was before. Obviously, the ashes cannot be simply frozen to turn them back into wood again. This is an example of an irreversible chemical reaction.  

Chemical reactions may also involve changes in color. In specific proportions and under the right conditions, carbon—which is black—can be combined with colorless hydrogen and oxygen to produce white sugar. This suggests another kind of change: a change in taste. (Of course, not every product of a chemical reaction should be tasted—some of the compounds produced may be toxic, or at the very least, extremely unpleasant to the taste buds.) Smell, too, can change. Sulfur is odorless in its elemental form, but when combined with hydrogen to form hydrogen sulfide (H2S), it becomes an evil-smelling, highly toxic gas.  


5 0
3 years ago
Other questions:
  • Which characteristic of life is demonstrated when eagles use sharp talons to grab fish from the water?
    7·2 answers
  • Why does 5060 have three significant figures?
    11·1 answer
  • Air is transparent material?
    14·2 answers
  • Spores are a form of asexual reproduction formed in ___.
    12·2 answers
  • A sample gaseous CO exerts a pressure of 45.6mm Hg in a 56.0L flask at 22 C. If the gas is released into a 2.70 x 10^4 liter roo
    6·1 answer
  • What is the difference between being imaginative in doing science and doing psuedoscience?
    9·1 answer
  • 24
    12·1 answer
  • In an endothermic reaction which bonds are stronger? The reactants or products? Explain
    14·1 answer
  • g 1. Write a balanced chemical equation, including physical state symbols, for the decomposition of solid sodium azide (NaN3) in
    6·1 answer
  • Convert 355 km/s into m/ns.
    7·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!