the average kinetic energy of the particles in a gas

The pH of the resulting solution when 20.0 mL of 0.20 M HC₂H₂O₂and 20.0 mL of 0.10 M NaOH are mixed is 3.07.

Neutralization is a chemical reaction in which acid and base react to form salt and water. Hydrogen (H⁺) ions and hydroxide (OH⁻ ions) react with each other to form water.

The strong acid and strong base neutralization have a pH value of 7.

The balanced equation for the reaction is:

HC₂H₂O₂ + NaOH → NaC₂H₃O₂ + H₂O

Moles of HC₂H₂O₂= concentration × volume = 0.20 M × 0.020 L = 0.004 mol

Moles of NaOH = concentration × volume = 0.10 M × 0.020 L = 0.002 mol

Since HC₂H₂O₂ is a weak acid, it will partially dissociate in water according to the equation:

HC₂H₂O₂ ⇌ H⁺ + C₂H₂O₂⁻

Initial:

HC₂H₂O₂: 0.004 M

H⁺: 0 M

C₂H₂O₂⁻: 0 M

Change:

HC₂H₂O₂: -x M

H⁺: +x M

C₂H₂O₂⁻: +x M

Equilibrium:

HC₂H₂O₂: 0.004 - x M

H⁺: x M

C₂H₂O₂⁻: x M

Ka = [H⁺][ C₂H₂O₂⁻] / [HC₂H₂O₂]

1.8 x 10⁻⁵ = x × x / (0.004 - x)

Since x is small compared to 0.004, so 0.004 - x = 0.004:

1.8 x 10⁻⁵= x² / 0.004

x² = 1.8 x 10⁻⁵ × 0.004

x² = 7.2 x 10⁻⁸

x = 8.49 x 10⁻⁴ M = [H⁺]

pH = -log( 8.49 x 10⁻⁴)

pH = 3.07

Learn more about Neutralization, here:

https://brainly.com/question/14156911

#SPJ4

The term used to denote the concentration of electrolytes in a given volume is "molarity".

Molarity-

Molarity is the number of moles of solute dissolved in one liter of the solution. Molarity is the most widely used concentration metric in chemistry, and it is frequently denoted by "M." It denotes the amount of solute in moles per liter of solution.

A solution's molarity can be calculated using the following formula:

Molarity = moles of solute / liters of solution

Molarity is often used to express the concentration of a solution's electrolytes because electrolytes break into ions when dissolved in a solvent, allowing for electrical conductivity.

Molarity can be used in other applications, such as stoichiometry, which involves determining how much of one compound is required to react completely with another.

Molarity is a useful tool for solving problems that involve chemical reactions since the number of moles of a substance is frequently used to establish reaction ratios, limit reactants, and determine the theoretical yield.

Learn more about the molarity from the given link-

https://brainly.com/question/30404105

#SPJ11

Organic Chemistry is the study of covalent compounds of Carbon and Hydrogen (Hydrocarbon) and their derivatives.

Inorganic Chemistry is the study of all elements and their compounds expect those of compounds of Carbon and Hydrogen (Hydrocarbon) and their derivatives.

The mass of 12.82 moles of lithium (Li) atoms is 88.89 g.

The molar mass of Lithium (Li) is 6.94 g/mol. Therefore, the mass of 12.82 moles of lithium (Li) atoms can be calculated as follows:

The number of moles of lithium (Li) = 12.82 mol

Molar mass of Lithium (Li) = 6.94 g/mol

We know that the mass of one mole of an element is equal to its atomic or molecular mass in grams.Therefore, the mass of 1 mole of Li atoms is equal to its molar mass which is 6.94 g/mol.

Then the mass of 12.82 moles of Li atoms can be found using mole to mass conversion as follows:

Mass = Number of moles × Molar mass

= 12.82 mol × 6.94 g/mol

= 88.89 g.

Learn more about molar mass -

brainly.com/question/837939

#SPJ11

The removal of each additional electron requires more energy than the removal of the previous one due to the increased attraction between the positively charged nucleus and the remaining negatively charged electrons.

The ionization energy is the energy required to remove an electron from an atom or ion. It is influenced by factors such as the atomic structure and electron configuration.
When an electron is removed from an atom, the ionization energy increases because the positive charge of the nucleus becomes stronger and holds the remaining electrons more tightly. This means that more energy is needed to overcome the increased attraction between the positively charged nucleus and the negatively charged electron.

In this case, the ionization energies for the removal of the third, fourth, and fifth electrons are given as 4581 kj/mol, 7465 kj/mol, and 9391 kj/mol, respectively.
The trend is that the ionization energies increase as we remove each additional electron. This is because as more electrons are removed, the positive charge of the nucleus becomes more pronounced and the remaining electrons are held even more tightly.T

As each additional electron is removed, more energy is required compared to the removal of the previous electron. This is because the positively charged nucleus exerts a stronger attraction on the remaining negatively charged electrons, making it harder to overcome the increased electrostatic force and remove subsequent electrons.

Learn more about ionization energy: https://brainly.com/question/30831422

#SPJ11

Mendeleev constructed his periodic table based on the similarities in the properties of elements and the periodic repetition of their physical and chemical properties.

Mendeleev constructed his periodic table based on certain observations. He observed that the elements have similar chemical properties, and he arranged them in the same vertical column. The properties of elements show periodic repetition. He took the atomic weights of the elements and arranged them in a periodic manner. He also kept some gaps in the table for the yet-to-be-discovered elements and predicted their properties. This led to the development of the concept of periodicity.

In his table, Mendeleev also recognized the existence of certain trends among the properties of elements. For instance, the first element in each group has the smallest atomic weight. The atomic weights of elements increase from left to right across each row. The most reactive metallic elements are at the bottom left-hand corner of the table, while the non-metallic elements are at the top right-hand corner of the table.

Learn more about periodic table here:

https://brainly.com/question/28747247

#SPJ11

The modified formula for the multiplicity of the two-dimensional ideal gas is Ω = (1/N!) * (Aⁿ / hⁿ) * (2πm/ħ²)ⁿ/²

(a) In a similar manner to the three-dimensional ideal gas, we can use the formula for the multiplicity (Ω) of a two-dimensional ideal gas given by the equation:

Ω = (1/N!) * (Vⁿ / h²ⁿ)) * (4πm/2πħ²)ⁿ/²

However, since the gas is now in a two-dimensional universe, we need to modify this equation to account for the area (A) instead of volume (V). The modified formula for the multiplicity of the two-dimensional ideal gas is:

Ω = (1/N!) * (Aⁿ / hⁿ) * (2πm/ħ²)ⁿ/²

(b) The expression for the entropy (S) of the two-dimensional ideal gas can be obtained by using the relationship between entropy and multiplicity:

S = k * ln(Ω)

Substituting the modified formula for Ω derived in part (a), we get:

S = k * ln[(1/N!) * (Aⁿ / hⁿ)) * (2πm/ħ²)ⁿ/²]

S = k * [ln(Aⁿ) - N * ln(h) + (N/2) * ln(2πm/ħ²) - ln(N!)]

(c) To determine the temperature (T), pressure (P), and chemical potential (μ), we need to take partial derivatives of entropy (S) with respect to energy (U), area (A), and number of particles (N).

Temperature (T):

(∂S/∂U) = 1/T

Pressure (P):

(∂S/∂A) = P/T

Chemical potential (μ):

(∂S/∂N) = -μ/T

To simplify the expressions further, it is necessary to evaluate the logarithmic term and apply Stirling's approximation for the factorial term (N!). The resulting expressions may be complex and involve various constants and logarithms.

It is important to note that since we are in a two-dimensional universe, the concept of pressure is defined as force per unit length instead of force per unit area as in three dimensions. Additionally, the chemical potential reflects the behavior of the gas in two dimensions.

The specific simplification and interpretation of the results would require further mathematical calculations and analysis based on the given expressions and the specific values of U, A, and N.

Learn more about Ideal gas:

brainly.com/question/20348074

#SPJ11

C4 plants are named so because they utilize a four-carbon molecule, oxaloacetate, as their first carbon molecule. C4 plants are special types of plants that have evolved to use a highly efficient carbon fixation pathway in order to maintain their photosynthetic rates in hot, arid environments where water is scarce.

C4 plants have specific adaptations that enable them to thrive in such environments. For example, they have thick waxy leaves to reduce water loss, and they use PEP carboxylase to fix CO2 into a four-carbon molecule that is then transported to bundle sheath cells for further processing in a specialized process.

Additionally, C4 plants have a unique arrangement of photosynthetic cells that minimizes photorespiration and allows them to maintain high photosynthetic rates at higher temperatures and under drought conditions. These plants are commonly found in hot, dry climates and are typically grasses, but include some crops such as corn, sugar cane, and sorghum.

To know more about photosynthetic visit-

https://brainly.com/question/26561399

#SPJ11

Agar is a complex polysaccharide derived from a seaweed.

Agar is a jelly-like substance that is used to culture bacteria and other microbes in the laboratory. It is a non-nutrient material that is used to provide a surface for the bacteria to grow on.

Agar is also used as a gelling agent in foods such as jams and jellies, as well as in the preparation of solid media for microbiological applications.

The structure of agar is composed of repeating units of galactose and 3,6-anhydrogalactose, linked together by glycosidic bonds.

It is a linear polymer of approximately 150 kDa.

Agar is a hydrophilic molecule, meaning that it attracts water molecules, which contributes to its ability to form gels.

learn more about complex polysaccharide on

https://brainly.com/question/33536825

#SPJ11

a. UV radiation is higher energy, causing DNA damage and increased skin cancer risk.

b. Lead shields X-rays due to density, but gamma radiation requires thicker, denser materials for effective blocking.

a. Ultraviolet (UV) radiation has shorter wavelengths and higher energy compared to visible light. This higher energy allows UV radiation to penetrate the skin and interact with cellular components, including DNA. UV radiation can cause damage to the DNA in skin cells, leading to mutations and an increased risk of skin cancer. Tanning is considered dangerous because it indicates exposure to UV radiation, which can have harmful effects on the skin.

b. X-rays and gamma radiation are both forms of high-energy electromagnetic radiation. However, they differ in their ability to penetrate materials. X-rays have lower energy and can be blocked by materials with high density and atomic number, such as lead. Lead effectively shields X-rays by absorbing and scattering the radiation, preventing it from reaching sensitive tissues. On the other hand, gamma radiation has higher energy and requires thicker and denser materials, such as concrete or lead combined with other shielding materials, for effective attenuation.

To learn more about UV radiation here

https://brainly.com/question/13849635

#SPJ4

The Keq (Equilibrium constant) of the reaction 14C (l) ⇌ 4A (g) + 6B (s) is 6.64.

Chemical equilibrium refers to the state of a system in which the concentration of the reactant and the concentration of the products do not change with time, and the system does not display any further change in properties.

It is the state of a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. While a reaction is in equilibrium the concentration of the reactants and products are constant.

The given reaction can be represented as:

2A (g) + 3B (s) ⇌ 7C (l)

the stoichiometric coefficients are 2, 3, and 7 for A, B, and C, respectively.

Keq = ([C]⁷) / ([A]² [B]³)

To find the Keq of the second reaction, we can rearrange the equation and substitute the stoichiometric coefficients:

Keq' = ([A]⁴  [B]⁶) / [C]¹⁴

Keq' = (0.38² . 0.38³) / 0.38⁷

Keq' = 0.38⁻² = 6.64

Learn more about Chemical equilibrium, here:

https://brainly.com/question/4289021

#SPJ4

The acid H3PO4 can donate three hydrogen ions (H+) per molecule.

Thus, the number of H+ ions that the acid H3PO4 can donate per molecule is 3.Explanation:H3PO4 is also known as phosphoric acid. Phosphoric acid is an inorganic mineral acid that is commonly used in fertilizers, detergents, and food additives.

The chemical formula of H3PO4 is H3PO4 which implies that it has three hydrogen ions that are attached to the phosphate anion.Each hydrogen ion, which is donated by H3PO4, has the ability to donate a single positive hydrogen ion or proton (H+).

Therefore, since H3PO4 has three hydrogen ions, it has the ability to donate three H+ ions per molecule (per H3PO4 molecule).

In other words, one molecule of H3PO4 can donate three hydrogen ions.

Therefore, the number of H+ ions that the acid H3PO4 can donate per molecule is 3.

Learn more about hydrogen ions in the link:

https://brainly.com/question/29033205

#SPJ11

The solution that contains the most solute particles per liter is 1 M Mg(NO₃)₂. The correct answer is option (b).


The solute particles in a solution can be ions or molecules. The number of solute particles per unit of volume is a measure of concentration and is expressed in mol/L or M. In the given options, 1 M KBr, 1 M Mg(NO₃)₂, 4 M ethanol, and 4 M acetic acid are given.  

The concentration of the solutions can be calculated using the formula:

Molarity (M) = Number of moles of solute / Volume of solution in liters

The number of solute particles per unit of volume is directly proportional to molarity. The solution with the highest molarity will have the most solute particles per liter.  

Therefore, the solution that contains the most solute particles per liter is 1 M Mg(NO₃)₂. The number of solute particles per liter of 1 M Mg(NO₃)₂ will be 3 times greater than 1 M KBr, and 2 times greater than 4 M ethanol or 4 M acetic acid.

Thus, the solution that contains the most solute particles per liter is 1 M Mg(NO₃)₂. The correct answer is option (b).

Learn more about molarity here:

https://brainly.com/question/2817451

#SPJ11

When an electrical current is applied to an aqueous solution of lithium sulfide, hydrogen gas will be produced at the cathode and sulfur will be produced at the anode.

At the cathode, positively charged hydrogen ions (H+) gain electrons and are reduced to hydrogen gas (H2).2H+ + 2e- → H2

At the anode, negatively charged sulfide ions (S2-) lose electrons and are oxidized to form elemental sulfur (S).

S2- → S + 2e-

It's worth noting that lithium ions (Li+) will also be present in the solution but they will not be produced at either the anode or cathode.

To know more about electrical visit-

https://brainly.com/question/33513737

#SPJ11

The most controversial form of alternative energy after nuclear power is: Fossil fuel.

Energy is the capability of doing work, and it comes in various forms. For example, mechanical energy is a form of energy that arises from the motion or location of an object, while thermal energy is the energy associated with the movement of atoms or molecules within a substance.

There are two types of energy: kinetic energy and potential energy.

Power refers to the amount of energy used in a given time period. In other words, power is the rate at which work is done. Energy is expressed in joules, while power is expressed in watts.

Power is calculated by dividing the amount of energy used by the amount of time it took to use it.

learn more about alternative energy  on

https://brainly.com/question/27263084

#SPJ11

The factors that determine how much chemical energy an object has include the object's mass, chemical composition, and the types of bonds that are present.

Chemical energy is one of the many different types of energy that exist, and it is the energy that is stored within an object's chemical bonds. Chemical energy has the potential to be released through a chemical reaction.

The factors that determine how much chemical energy an object has include the object's mass, chemical composition, and the types of bonds that are present.

The more mass an object has, the more chemical energy it will contain because there will be more bonds between the particles in the object's molecules.

The chemical composition of an object also plays a role in determining its chemical energy. For example, molecules that contain more carbon and hydrogen atoms will typically have more chemical energy than molecules that contain fewer carbon and hydrogen atoms.

Finally, the types of bonds that are present in an object also play a role in determining its chemical energy. Bonds that are stronger and more stable will contain more chemical energy than bonds that are weaker and less stable.

In conclusion, the amount of chemical energy an object contains depends on its mass, chemical composition, and the types of bonds that are present in it. The chemical energy is the potential energy that can be released through a chemical reaction.

Learn more about the chemical energy from the given link-

https://brainly.com/question/5650115

#SPJ11

The most likely place where an exoenzyme participates in a chemical reaction is outside of the cell.

Option E is correct.

Exoenzymes are enzymes that are synthesized and secreted by cells to act on substrates outside of the cell that produced them. These enzymes are typically involved in extracellular processes, such as breaking down large molecules into smaller ones, digesting nutrients, or facilitating interactions with the environment.

Therefore, the correct answer is E. outside of the cell.

Learn more about Enzymes:

brainly.com/question/30667574

#SPJ11

Temperature and fluidity of the cell membrane are directly proportional to each other. As temperature increases, the fluidity of the cell membrane also increases.

The plasma membrane of the cell is a thin, flexible layer that encloses all cells, and it is also known as the cell membrane. It serves as a barrier to separate the cell's contents from the external environment. Fluidity of the cell membrane refers to the movement of lipid molecules within the cell membrane. Temperature and fluidity of the cell membrane are directly proportional to each other.

As temperature increases, the fluidity of the cell membrane also increases, and vice versa. The fluidity of the cell membrane is essential for the functioning of membrane-bound proteins, which play an essential role in various cellular activities, such as cell signaling, transport of molecules, and cell recognition. Therefore, temperature directly affects the fluidity of the cell membrane, which can impact cellular activities and the survival of the organism.

Learn more about cell membrane here:

https://brainly.com/question/13049297

#SPJ11

Neon (Ne) has 8 electrons in its outer shell. Neon belongs to the noble gases group on the periodic table, specifically Group 18 or Group 8A.

The chemical elements are arranged in rows and columns on the periodic table, also known as the periodic table of the elements. It is frequently used in physics and other sciences as a chemistry organizing symbol.

Learn more about Periodic table:

brainly.com/question/15987580

#SPJ11

Answer:

Answer and Explanation: To determine the number of moles of silver (Ag), we simply need to divide the number of atoms of Ag by the Avogadro's number, N , which is equal to 6.02 10 atoms of Ag per mole of Ag. Therefore, c) 6.3 moles of Ag are present in a sample of 3.8 10 atoms Ag.

Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

Answer: B) the ideal gas constant

Explanation:

All gases obey an equation of state known as the Ideal gas law: PV = nRT,

Where Pressure = P, volume = V, and temperature = T, n is the number of moles of the gas and R is the Ideal Gas Constant = 8.314 joules per kelvin per mole.

Therefore the Correct Option is B.

To learn more about the ideal gas law:

https://brainly.com/question/12624936

The process used to mine salts by filling shallow ponds with seawater is known as solar salt production.

The process of mining salts by filling shallow ponds with seawater is called solar salt production. It is a method commonly used to extract salt from seawater on a large scale. The process takes advantage of the natural evaporation of water under the sun, leaving behind concentrated salt crystals that can be collected and processed.

The process begins by selecting suitable coastal areas or salt flats, typically in arid or semi-arid regions with access to the sea. These areas are usually flat and have low rainfall, facilitating the evaporation process. Shallow ponds or basins, also known as salt pans or evaporation ponds, are constructed to contain the seawater.

Seawater is then pumped into these ponds or is allowed to flow in naturally during high tide. The ponds are designed to maximize the exposure of seawater to sunlight and heat. The sun's energy drives the evaporation process, causing the water to gradually evaporate, leaving behind concentrated brine solutions.

Over time, as the water continues to evaporate, the salt concentration in the remaining brine increases. The concentrated brine, also known as bittern, becomes supersaturated with dissolved salts, including sodium chloride and other minerals. As the saturation point is reached, salt crystals begin to precipitate and form salt beds at the bottom of the ponds.

Learn more about evaporation here:

https://brainly.com/question/33571997

#SPJ11

Based on the information provided, the principle of the conservation of mass did apply in this example.

The principle of the conservation of mass states that mass is neither created nor destroyed in a chemical reaction. In other words, the total mass of the reactants should be equal to the total mass of the products.

In the given scenario, Nicole measured 25 g of sodium carbonate and 10 mL of vinegar, which can be considered the reactants. The total mass of the reactants and the beaker was determined to be 100 g. After mixing the reactants, bubbling and a white residue were observed, and the total mass became 98 g.

To analyze the conservation of mass, we need to consider the mass of the products formed. The bubbling and white residue suggest a chemical reaction occurred, likely resulting in the formation of a gas and a solid product. Although the exact reaction and products are not specified, it is evident that some change took place.

The total mass decreasing from 100 g to 98 g indicates that the mass of the products is less than the mass of the reactants and the beaker. This might be due to the formation of a gas that escaped from the reaction mixture.

While the total mass decreased, it is important to note that mass was not created or destroyed. The lost mass in the form of the escaping gas can be accounted for if it is considered separately.

For more such questions conservation visit:

https://brainly.com/question/19162396

#SPJ8

The normal boiling point for the substance in the given phase diagram is about 65°C.


The phase diagram is a graphical representation of the relationship between temperature and pressure of a substance under conditions of constant pressure. It represents how a substance changes from solid, liquid, and gas phases under varying conditions of pressure and temperature.

From the given phase diagram, we can see that the normal boiling point for the substance is approximately 65°C. The normal boiling point is the temperature at which a substance boils at standard pressure of 1 atm. At this temperature, the vapor pressure of the substance is equal to the atmospheric pressure of 1 atm.

Hence, we can conclude that the normal boiling point for the given substance is approximately 65°C based on the phase diagram provided.

Learn more about boiling point here:

https://brainly.com/question/1514229

#SPJ11

Hexane would have the fragment 57 in its mass spectrum and the correct option is option C.

A mass spectrum is  the m/z ratios of the ions present in a sample plotted against their intensities. Each peak in a mass spectrum indicates a component of unique m/z in the sample, and heights of the peaks give information about the relative abundance of the various components in the sample.

This fragment could arise from the loss of a methyl group (CH₃) from the hexane molecule, resulting in the fragment with the formula C₅H₁₁. The m/z value represents the ratio of the fragment's mass to its charge, so it does not necessarily correspond to the exact mass of the fragment.

Thus, the ideal selection is option C.

Learn more about Mass spectrum, here:

https://brainly.com/question/31040502

#SPJ4

Answer:

The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based on the 1909 Geiger–Marsden gold foil experiment.

Explanation:

Answer:

Atomic nuclei consist of electrically positive protons and electrically neutral neutrons.

Explanation: Hope it helps :)

The reducing agent in the following reaction 2Na + 2H₂O → 2NaOH + H₂ is Na. The correct answer is option A.

Oxidation-reduction reactions or redox reactions are chemical reactions that involve the transfer of electrons between two species. In such reactions, the reducing agent is the one that is oxidized, i.e., it loses electrons. On the other hand, the oxidizing agent is the one that is reduced, i.e., it gains electrons. The reducing agent reduces the oxidizing agent by donating electrons to it.

In this reaction, sodium (Na) is oxidized, and hence acts as the reducing agent. Na loses an electron and becomes positively charged Na+ ion, which then combines with hydroxide (OH-) ion to form sodium hydroxide (NaOH). The hydrogen ion (H+) produced by the dissociation of water is reduced to hydrogen gas (H₂) by accepting the electron donated by sodium.

Thus, the reducing agent in the reaction 2Na + 2H₂O → 2NaOH + H₂ is Na. The correct answer is option A.

Learn more about redox reactions here:

https://brainly.com/question/13293425

#SPJ11

The well-known ports range from 0 to 1023. These ports are reserved for specific services and protocols, and they are commonly used by system processes or by programs executed by privileged users.

Here is a breakdown of some commonly known ports within the well-known port range:

20: FTP Data

21: FTP Control

22: SSH (Secure Shell)

23: Telnet

25: SMTP (Simple Mail Transfer Protocol)

53: DNS (Domain Name System)

80: HTTP (Hypertext Transfer Protocol)

110: POP3 (Post Office Protocol version 3)

143: IMAP (Internet Message Access Protocol)

443: HTTPS (HTTP Secure)

465: SMTP over SSL/TLS

587: SMTP Submission

993: IMAPS (IMAP over SSL/TLS)

995: POP3S (POP3 over SSL/TLS)

These are just a few examples, and there are many other services and protocols assigned to specific well-known ports within the range of 0 to 1023.

Learn more about Range:

brainly.com/question/29746356

#SPJ11

The chemical equation for the reaction between hydrogen gas and nitrogen to form ammonia is 3H₂ + N₂ → 2NH₃.

To balance the equation, we need to ensure that the same number of atoms of each element is present on both sides of the equation. In this case, we have three hydrogen atoms on the left side and six hydrogen atoms on the right side.
To balance the hydrogen atoms, we can place a coefficient of 2 in front of the hydrogen gas:

3H₂ + N₂ → 2NH₃

Now, we have six hydrogen atoms on both sides. Next, we need to balance the nitrogen atoms. We have one nitrogen molecule on the left side and two nitrogen atoms in total on the right side.

To balance the nitrogen atoms, we can place a coefficient of 2 in front of the nitrogen molecule. 3H₂ + 2N₂ → 2NH₃

Now, we have six hydrogen atoms and four nitrogen atoms on both sides of the equation. The equation is balanced.

Learn more about balanced chemical equations here:

brainly.com/question/28294176

#SPJ11