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
Basile [38]
3 years ago
15

Fish breathe the dissolved air in water through their gills. Assuming the partial pressures of oxygen and nitrogen in air to be

0.20 atm and 0.80 atm, respectively, calculate the mole fractions of oxygen and nitrogen in water at 298 K. Comment on your results
Chemistry
1 answer:
amid [387]3 years ago
5 0

Answer:

X(O₂) = 0.323

X(N₂) = 0.677

Explanation:

We have the partial pressures of oxygen (O₂) and nitrogen (N₂):

P(O₂) = 0.20 atm

P(N₂) = 0.80 atm

In order to solve the problem, you need the solubilities of each gas in water at 298 K. We can consider 1.3 x 10⁻³ mol/(L atm) for oxygen (O₂) and 6.8 x 10⁻⁴mol/(L atm) for nitrogen (N₂) from the bibliography.

s(O₂) = 1.3 x 10⁻³ mol/(L atm)

s(N₂) = 6.8 x 10⁻⁴mol/(L atm)

So, we calculate the concentration (C) of each gas as the product of its partial pressure (P) and the solubility (s):

C(O₂) = P(O₂) x s(O₂) = 0.20 atm x 1.3 x 10⁻³ mol/(L atm) = 2.6 x 10⁻⁴mol/L

C(N₂) = P(N₂) x s(N₂) = 0.80 atm x 6.8 x 10⁻⁴mol/(L atm) = 5.44 x 10⁻⁴ mol/L

In 1 liter of water, we have the following number of moles (n):

n(O₂) = 2.6 x 10⁻⁴ mol

n(N₂) = 5.44 x 10⁻⁴ mol

Thus, the total number of moles (nt) is calculated as the sum of the number of moles of the gases in the mixture:

nt = n(O₂) + n(N₂) = 2.6 x 10⁻⁴ mol + 5.44 x 10⁻⁴ mol = 8.04 x 10⁻⁴ mol

Finally, the mole fraction of each gas is calculated as the ratio between the number of moles of each gas and the total number of moles:

X(O₂) = n(O₂)/nt = 2.6 x 10⁻⁴ mol/(8.04 x 10⁻⁴ mol) = 0.323

X(N₂) = n(N₂)/nt = 5.44 x 10⁻⁴ mol/(8.04 x 10⁻⁴ mol) = 0.677

You might be interested in
The reaction H2(g)+F2(g)?2HF(g) is spontaneous at all temperatures. A classmate calculates the entropy change for this reaction
Pachacha [2.7K]

Answer:

The correct answer is there is a mistake in the calculation. The second law of thermodynamics state that in any spontaneous process there is an increase in the entropy of the universe.

Explanation:

According to the second law a reaction will occur in a system spontaneously if the total entropy of both system and surrounding increases during the reaction.That means in case of spontaneous reaction entropy change is always positive.

     But according to the question the reaction H2+F2=2HF is spontaneous in all temperature.So according to the second law of thermodynamics i can say that my classmate made a mistake in calculation that"s why his result for entropy change comes negative.

6 0
3 years ago
If your conclusion does not agree with (disproves) your hypothesis:
Nataliya [291]

If your findings disproves your hypothesis then your hypothesis is probably wrong.


5 0
3 years ago
Where does condensation occur
kotegsom [21]
Answer:
            The condensation of water occurs in Atmosphere.

Explanation:
                   As we know when water is heated it converts into vapors and vapors on cooling condense back into liquid water. Hence, the water present in Oceans (hydrosphere) on heating evaporates (remember evaporation takes place at any temperature) and move upward into the atmosphere. In atmosphere at high altitude the temperature drops (almost 18 °C) which causes the water vapors to condense hence, resulting in the formation of clouds which on precipitation causes rain fall.
8 0
3 years ago
Read 2 more answers
Most ionic compouds are crystalline solids at room temperature. True False
Zina [86]

<u>Answer:</u>

For 1: The correct answer is True.

For 2: The correct answer is True.

For 3: The correct answer is False.

For 4: The correct answer is False.

For 5: The correct answer is True.

<u>Explanation:</u>

Ionic compounds are formed when there is complete transfer of electrons from one element to another element to form a compound. The element which looses electrons is known as electropositive element and tend to form cation and the element which gains electrons is known as electronegative element and tend to form anion.

These compounds are generally crystalline solids at room temperature.

These compounds are electrically neutral species. Total negative charge is always equal to the total positive charge.

As, there is electrostatic attraction between the charged species, therefore they form stronger bonds and to break these bonds, more and more amount of energy is require. Hence, these compounds have high melting as well as boiling points.

When these compounds are melted, the ions get separated and the solution contains free ions which tend to conduct electricity very easily. Hence, ionic compounds do conduct electricity when they are melted.

Therefore, from the above information:

For 1: The correct answer is True.

For 2: The correct answer is True.

For 3: The correct answer is False.

For 4: The correct answer is False.

For 5: The correct answer is True.

3 0
3 years ago
Which type of material incorporates a variety of substances to enhance desired properties such as strength and flexibility?
aliina [53]

Answer:

Polymers

Explanation:

6 0
2 years ago
Other questions:
  • Why are the boiling point and freezing point of solutions affected by the concentration of solute particles?
    8·1 answer
  • What are the examples of all the non metals in the first twenty element​
    12·1 answer
  • What affect will adding sugar have on the viscosity of water?
    11·2 answers
  • A) Why is mole called fundamental<br>un<br>b) State the law of moment.​
    12·1 answer
  • When elements that form a mineral dissolve in hot water, they form a mixture called a(n) ______.?
    15·1 answer
  • Why are there different theories about the effects of global warming? a. There is no data to support global warming. b. Global c
    14·1 answer
  • Two comets are 300 m apart. One
    14·1 answer
  • What should iron oxide be categorized
    10·2 answers
  • Can you tell me name of Chemicals in food?​
    14·1 answer
  • Yasir wants to determine if there is a relationship between room color and sleep. Based on his research, Yasir makes an educated
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!