gas mixture being used to simulate the atmosphere of another planet consists of 336 mg of methane, 177 mg of argon, and 223 mg of nitrogen. The partial pressure of nitrogen at 287 K is 13 kPa. Calculate the total pressure of the mixture

100 g of NH reacts with 78 g oxygen in the balanced equation: 4NH₃ + 5O₂ → 4NO + 6H₂O.

a) The balanced equation is 4NH₃ + 5O₂ → 4NO + 6H₂O.

b) Moles of NH₃ = 100 g / 17.031 g/mol

= 5.877 mol

Moles of NO produced = 5.877 mol NH₃ × (4 mol NO / 4 mol NH₃)

= 5.877 mol

From 78 g O₂, calculate the amount of NO produced:

Moles of O₂ = 78 g / 31.998 g/mol

= 2.438 mol

Moles of NO produced = 2.438 mol O₂ × (4 mol NO / 5 mol O₂)

= 1.950 mol

Therefore, Oxygen is the limiting reactant because it produces less NO.

c) From the balanced equation, for every 5 moles of O₂ reacted, 6 moles of H₂O are produced.

Therefore, the mole ratio of H₂O to O₂ is 6:5.

Moles of H₂O produced = 1.950 mol NO × (6 mol H2O / 4 mol NO)

= 2.925 mol

At STP, 1 mole of gas occupies 22.4 L.

Volume of H₂O = 2.925 mol × 22.4 L/mol

= 65.52 L

d)The molar mass of NO is 30.006 g/mol, so 16.78 g of NO is equivalent to 0.559 mol.

Moles of NO produced = 2.438 mol O₂ × (4 mol NO / 5 mol O₂)

= 1.950 mol

Percent yield = (actual yield / theoretical yield) × 100%

= (0.559 mol / 1.950 mol) × 100%

= 28.7%

This is not very efficient.

e) Moles of NH₃ consumed = 1.950 mol NO × (4 mol NH₃ / 4 mol NO)

= 1.950 mol

Mass of NH₃ consumed = 1.950 mol × 17.031 g/mol

= 33.19 g

Excess NH₃ = initial amount - the amount consumed

= 100 g - 33.19 g = 66.81 g

The excess NH₃ is 66.81 g.

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SN1 reactions, which are nucleophilic substitution reactions that proceed through a unimolecular pathway, typically result in the formation of a racemic mixture because the planar carbocation intermediate allows for the nucleophile to attack from both sides, forming two enantiomers in equal amounts.

SN1 reactions result in a racemic mixture because of the formation of a planar carbocation intermediate. During the SN1 reaction, the leaving group departs from the substrate molecule, creating a positively charged, sp2 hybridized carbocation. This carbocation is planar, meaning it has a flat geometry.

Since the carbocation is planar, the nucleophile can attack it from either the top face or the bottom face with equal probability. This leads to the formation of two enantiomers, which are non-superimposable mirror images of each other. When the two enantiomers are formed in equal amounts, they create a racemic mixture, which is a 50:50 mixture of the two enantiomers.

In summary, SN1 reactions result in a racemic mixture because the planar carbocation intermediate allows for the nucleophile to attack from both sides, forming two enantiomers in equal amounts.

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The stoichiometry of the reaction shows that the number of moles of CH4 is 9.4 moles.

The law of conservation of mass, which asserts that matter can only be rearranged during a chemical reaction, is the foundation for stoichiometry. Many facets of chemistry, such as chemical synthesis, analysis, and industrial operations, depend on stoichiometry.

We know from the question that;

Number of moles of CH4 = 149.7 g/16 g/mol

= 9.4 moles

If 1 mole of carbon produces 1 moles of CH4

9.4 moles of carbon produce 9.4 moles of CH4

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The given graph depicts the Gay-Lussac's law. The gas law which gives the relationship between the pressure and absolute temperature is known as the Gay-Lussac's law. It is an important gas law.

1. Gay-Lussac's law states that the pressure exerted by a gas of a given mass and kept at a constant volume varies directly with the absolute temperature of the gas. In other words, the pressure exerted by a gas is proportional to the temperature.

2. Here the graph illustrates that with the increase in temperature the pressure of the gas molecules also increases.

3. As the temperature increases, the motion of the molecules also increases.

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The correct answer is B. 30.0%. Acetone, C3H6O, has three carbon atoms and six hydrogen atoms. The molar mass of C3H6O is 58.08 g/mol. The mass of carbon in one mole of C3H6O is 3 x 12.01 g = 36.03 g. Therefore, the percent by mass of carbon in C3H6O is 36.03/58.08 x 100 = 61.99%, which is 30.0% when rounded to the nearest whole number.

can you give me the brilliant mark?

The general term that describes all organisms that obtain their nutrition by breaking down pre-made organic compounds is heterotrophs.

A heterotroph is an organism that eats other plants or animals for energy and nutrients. The term stems from the Greek words hetero for “other” and trophe for “nourishment.”

Organisms are characterized into two broad categories based upon how they obtain their energy and nutrients: autotrophs and heterotrophs. Autotrophs are known as producers because they are able to make their own food from raw materials and energy. Examples include plants, algae, and some types of bacteria. Heterotrophs are known as consumers because they consume producers or other consumers. Dogs, birds, fish, and humans are all examples of heterotrophs.

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In the presence of water, aldehydes and ketones react to form hydrates. This is called a hydration reaction.

The hydration reaction occurs when the carbonyl group (C=O) of an aldehyde or ketone undergoes nucleophilic addition with a water molecule. The nucleophilic oxygen atom of water attacks the electrophilic carbonyl carbon atom, forming a tetrahedral intermediate. The tetrahedral intermediate then loses a proton to reform the carbonyl group and generate the hydrate or geminal diol.

The general reaction for the hydration of an aldehyde or ketone can be represented as follows:

RCHO + [tex]H_{2}O[/tex] → [tex]RCH(OH)_{2}[/tex] (hydrate or geminal diol)

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The standard electrode potential for the Zn-Cu voltaic cell is +1.10 V. This indicates that the reaction is spontaneous and that the electrons flow from the anode (Zn) to the cathode (Cu) through the external circuit.

The standard electrode potential for a voltaic cell can be calculated by subtracting the standard reduction potential of the anode from the standard reduction potential of the cathode. The anode is the electrode where oxidation occurs, while the cathode is the electrode where reduction occurs. The standard reduction potentials are measured under standard conditions of temperature, pressure, and concentration of reactants.

For example, if we have a voltaic cell constructed with a zinc electrode (Zn) as the anode and a copper electrode (Cu) as the cathode, the standard electrode potential can be calculated as follows:

Zn(s) → Zn2+(aq) + 2e-    E° = -0.76 V
Cu2+(aq) + 2e- → Cu(s)      E° = +0.34 V

E°cell = E°cathode - E°anode
E°cell = (+0.34 V) - (-0.76 V)
E°cell = +1.10 V

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In very basic conditions, amides can be hydrolyzed into carboxylate anions and amines. In very acidic conditions, amides can be hydrolyzed into carboxylic acids and amines.

~~~Harsha~~~

Answer:

Tautomers are organic compound isomers that may rapidly interconvert via a chemical process known as tautomerization. They are structural isomers distinguished by the positioning of a proton and a double bond.

The relative stability of each form determines the equilibrium between keto and enol tautomers. Because of the increased electronegativity of the carbonyl oxygen, which stabilises the negative charge produced by the enolization process, the keto form is typically more stable than the enol form. As a result, the equilibrium is often on the keto side.

The molar solubility of KNO₃ is not affected by the pH of the solution. Hence option e is correct.

The solubility of ionic compounds containing basic anions rises as the pH of the solution falls. Changes in pH have no impact on solubility for ionic compounds containing anions with low basicity, such as the conjugate bases of strong acids.

Many substances' solubility is substantially influenced by the pH of the solution. For instance, the anion is the conjugate base of a weak acid that may get protonated in solution in many sparingly soluble salts.

Temperature, pressure, and the solid's polymorphic state all affect how soluble something is. The concentration of the solute in saturated solution that is in equilibrium with the most stable crystal form of the solid substance is known as its thermodynamic solubility.

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The rate of reaction a is approximately equal to the rate of reaction b when the system is in equilibrium.

In a system in equilibrium, the rupture and formation of new bonds from the formation and decomposition of substances must have the same reaction rate. Thanks to equal speeds we can say that a system in equilibrium is dynamic and in general every system tends to move spontaneously towards equilibrium. The environment never interferes.

For example.

N₂ (g) + 3H₂ (g) ---> 2NH₃ (g) formation

2NH₃ ----> N₂(g) + 3H₂ (g) decomposition

N₂(g) + 3H₂ (g)  <------>  2NH₃ (g)     In equilibrium

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The complete question should be

do you expect the rate of reaction a to be greater than, less than, or approximately equal to the rate of reaction b at equilibrium?

94.85 g of iron is formed when 725 kj of heat is released.

The exothermic reaction is as follows

2 Al(s) + Fe₂O₃ (s) ⇒ 2 Fe(s) + Al₂O₃(s) Δhrxn = –850 kJ

The change in reaction enthalpy for this reaction has a negative sign. The sign standard simply denotes that energy is released to the environment during the reaction. The reaction is exothermic, to put it another way. Considering simply its magnitude, this suggests that 850 kJ of energy are required for this reaction to take place between 2 moles of aluminium and 1 mole of iron oxide.

Now, if you only had 725 kJ of energy, the reaction would be incomplete but would still result in the formation of iron (Fe). We perform the following stoichiometric calculations:

725 kJ × (2 mol Fe/850 kJ) = 1.7 moles of Fe

Given that 55.6 g/mol is the molar mass of iron, the mass of generated iron is

1.7 mol Fe × 55.6 g/mol = 94.85 g iron

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The volume of a 5% solution of [tex]C_3H_6O[/tex] that would contain 20 mL of  [tex]C_3H_6O[/tex] is 315.6 mL.

A 5% solution of  [tex]C_3H_6O[/tex] means that there are 5 grams of  [tex]C_3H_6O[/tex] in 100 mL of solution. To determine the volume of the solution that would contain 20 mL of  [tex]C_3H_6O[/tex], we can use the following steps:

Determine the mass of  [tex]C_3H_6O[/tex] in 20 mL:

Since the density of  [tex]C_3H_6O[/tex] is 0.789 g/mL, the mass of  [tex]C_3H_6O[/tex] in 20 mL is:

mass = volume * density = 20 mL * 0.789 g/mL = 15.78 g

Determine the volume of the 5% solution that contains 15.78 g of  [tex]C_3H_6O[/tex]:

Since there are 5 grams of  [tex]C_3H_6O[/tex] in 100 mL of solution, the volume of the solution containing 15.78 g of  [tex]C_3H_6O[/tex] is:

volume = (15.78 g / 5 g) * 100 mL = 315.6 mL

Therefore, the volume of a 5% solution of  [tex]C_3H_6O[/tex] that would contain 20 mL of  [tex]C_3H_6O[/tex] is 315.6 mL.

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The two changes, silver jewelry tarnishing and a dinosaur bone turning into rock over millions of years, both involve chemical reactions and the transformation of the original substance into a new one.

In the case of silver jewelry, tarnishing occurs when the silver reacts with substances in the air, such as sulfur compounds, to form a new compound, silver sulfide. The original shiny and lustrous silver surface is transformed into a dull and tarnished one due to this chemical reaction.

Similarly, a dinosaur bone turning into rock over millions of years involves a chemical process called fossilization, which transforms the original bone material into a new mineralized substance, such as a form of calcium phosphate.

This process occurs through the infiltration of minerals into the pores and spaces of the original bone material, which replaces the original organic material with a new mineralized one.

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When diols act as protecting groups, they protect reactive functional groups such as carbonyl and hydroxyl groups in organic synthesis. They are particularly useful in multi-step synthesis where temporary protection is needed to prevent unwanted reactions at certain stages. Commonly used diols for this purpose are ethylene glycol and its derivatives.

To remove the protecting groups, a suitable deprotection reagent is used. Common reagents for this purpose include acid-catalyzed hydrolysis, which typically involves the use of a strong acid like hydrochloric acid or trifluoroacetic acid.

In summary, diols protect reactive functional groups in organic synthesis, and strong acids are used to remove these protecting groups.

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Answer:

Water's property of high polarity gives it the ability to dissolve many chemicals because hydrogen has a positive electrical charge and oxygen has a negative electrical charge. This substance makes up the majority of your cells, and is necessary for them to carry out most of their chemical reactions.

Explanation:

i hope this helps.

The property of water that allows it to dissolve many compounds and transport materials is its "polarity."

Water is a polar molecule, which means it has a partial positive charge on one end (the hydrogen atoms) and a partial negative charge on the other end (the oxygen atom). This polarity results from the unequal sharing of electrons between the oxygen and hydrogen atoms in a water molecule.

The polar nature of water enables it to dissolve many compounds by forming hydrogen bonds with them. Positively charged parts of a compound are attracted to the negative oxygen end of water, while negatively charged parts are attracted to the positive hydrogen ends. This interaction breaks apart the compounds into individual ions or molecules, which become surrounded by water molecules and are thus dissolved in the water.

This property of water makes it an excellent solvent, capable of dissolving and transporting a wide variety of materials. This is particularly important in biological systems, where water serves as the primary medium for transportation of nutrients, waste products, and other essential compounds. In the environment, water plays a crucial role in transporting dissolved minerals and other substances, shaping the Earth's landscape through processes like erosion and sedimentation.

In summary, water's polarity allows it to dissolve many compounds and transport materials, making it an essential component of life and environmental processes.

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The number of moles to the equations are as follows;

1. 0.800 mol     2. 0.0814 mol      3. 0.162 mol

4. 2.8197 mol   5. 1.8798 mol    6. 2.8917 mol     7. 4mol of  LiNO3 should make 2 mol of Li2SO4

1. 0.400 x (2/1) = 0.800 mole

2. 7.50(1/46.07) = 0.1628

0.1628(1/2) = 0.0814 mol

3. 7.50(1/46.07) = 0.1628

0.1628(2/2) = 0.1628 mol

4. 150(1/159.69) = 0.9399

0.9399(3/1) = 2.88197 mol

5. 150(1/159.69) = 0.9399

0.9399(2/1) = 1.898 mole

6.  0.9399(3/1) = 2.88197 mol

7. 250(1/109.94) = 2.2737 mole

The above answer is based on the information below, that was gotten from the picture;

Using the equation:

C6H12O6 → 2 C2H5OH + 2 CO2

6. How many moles of CO2 are produced when 0.400 mol of C6H12O6 react?

7. How many moles of C6H12O6 are needed to form 7.50 g of C2H5OH?

8. How many moles of CO2 form when 7.50 g of C2H5OH are produced?

Using the equation:

Fe2O3 + 3CO → 2 Fe + 3CO2

9. Calculate the number of moles of CO that can react with 150 g of Fe2O3.

10. Calculate the number of moles of Fe formed when 150 g of Fe2O3 reacts.

11. Calculate the number of moles of CO2 formed when 150 g of Fe2O3 reacts.

Using the equation:

Pb(SO4)2 + 4 LINO3 → Pb(NO3)4+2 Li2SO4

12. How many moles of lithium nitrate will be needed to make 250 grams of lithium sulfate?

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Nonpolar covalent bonds have an electronegativity difference of 0.0 to 0.4, polar covalent bonds have an electronegativity difference of 0.5 to 1.9, and ionic bonds have an electronegativity difference of greater than 2.0.

The approximate ranges of electronegativities for nonpolar covalent bonds, polar covalent bonds, and ionic bonds are:

1. Nonpolar covalent bonds: These bonds occur when there is an electronegativity difference of approximately 0 to 0.4 between the two atoms involved in the bond.

2. Polar covalent bonds: These bonds form when the electronegativity difference between the two atoms is approximately 0.5 to 1.9. In these bonds, there is an unequal sharing of electrons, creating a polar molecule.

3. Ionic bonds: These bonds form when the electronegativity difference between the two atoms is approximately 2.0 or greater. In ionic bonds, one atom transfers its electrons to the other atom, resulting in charged ions.

These ranges are based on the Pauling scale of electronegativity, which measures the relative attraction of atoms for shared electrons in a covalent bond.

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15.9 grams of oxygen were needed for the reaction when hydrogen is combusted with oxygen the product is water.

The balanced chemical equation for the combustion of hydrogen with oxygen to form water is:

2[tex]H_2[/tex] + [tex]O_2[/tex] → 2[tex]H_2O[/tex]

From the equation, we can see that two moles of hydrogen are required for every mole of oxygen to produce two moles of water.

First, we need to calculate the number of moles of hydrogen used in the reaction:

n([tex]H_2[/tex]) = m([tex]H_2[/tex]) / M([tex]H_2[/tex]) = 2 g / 2.016 g/mol = 0.993 mol

Next, we can use the mole ratio from the balanced equation to calculate the number of moles of oxygen required:

n([tex]O_2[/tex]) = 0.5 × n([tex]H_2[/tex]) = 0.5 × 0.993 mol = 0.4965 mol

Finally, we can calculate the mass of oxygen required using its molar mass:

m([tex]O_2[/tex]) = n([tex]O_2[/tex]) × M([tex]O_2[/tex]) = 0.4965 mol × 32.00 g/mol = 15.888 g

Therefore, approximately 15.9 grams of oxygen were needed for the reaction.

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The question is -

When hydrogen is combusted with oxygen the product is water. if you produce 20 grams of water using 2 grams of hydrogen, how many grams of oxygen were needed for the reaction?

The concentration of chemical exposure does not depend on c. the LD50 value of the chemical.

The concentration of chemical exposure refers to the amount of a specific chemical in a particular environment. It depends on factors such as the ability of the chemical to bioaccumulate (a), the persistence of the chemical (b), the ability of the chemical to biomagnify (d), and the solubility of the chemical (e). However, the LD50 value (c) represents the lethal dose that would kill 50% of a test population and is not directly related to the chemical concentration in the environment.

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The pH of the solution is 1.64, so the correct answer is B) 1.64.

To find the pH of the solution, first, we need to determine the moles of HCl and KOH, then find the moles of H+ ions remaining in the solution, and finally calculate the pH.

Moles of HCl = 0.100 M × 0.040 L = 0.0040 mol
Moles of KOH = 0.100 M × 0.025 L = 0.0025 mol

Since HCl and KOH react in a 1:1 ratio, 0.0025 mol of HCl and 0.0025 mol of KOH will neutralize each other, leaving 0.0040 - 0.0025 = 0.0015 mol of HCl.

Total volume of the solution = 40.00 mL + 25.00 mL = 65.00 mL = 0.065 L
Concentration of H+ ions = 0.0015 mol / 0.065 L = 0.0231 M

To find the pH of the solution, use the formula:
pH = -log10[H+]
pH = -log10(0.0231) = 1.64 so the correct answer is B)

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1. After the addition of 6 M HCl to the sample, the precipitate would be [tex]Ba_{3}(PO_{4})_{2}[/tex].

2. After the addition of [tex]H_{2}S[/tex] and 0.2 M HCl, the precipitate would be CdS and ZnS.

3. After the addition of [tex]OH^{-}[/tex] to a pH of 8, the precipitate would be FeS.

Reason for 1. This is because HCl will react with the phosphate ions in [tex]Ba_{3}(PO_{4})_{2}[/tex] to form [tex]H_{3}PO_{4}[/tex] and [tex]BaCl_{2}[/tex], which is insoluble in water and will precipitate out.
Reason for 2. This is because [tex]H_{2}S[/tex]  will react with the cadmium and zinc ions in CdS and ZnS to form insoluble sulfides that will precipitate out.
Reason for 3. This is because at a pH of 8, the iron(II) ions in FeS will react with hydroxide ions to form insoluble iron(II) hydroxide, which will then react with any remaining  [tex]H_{2}S[/tex]  to form FeS, which is also insoluble and will precipitate out.

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Thermostats used in electric irons differ from those in small room heaters in that they are Operative at higher temperatures. The correct alternative is D.

Thermostats used in electric irons must be designed to operate at higher temperatures compared to those used in small room heaters.

This is because electric irons typically operate at much higher temperatures than small room heaters, and the thermostats used in irons must be able to regulate the temperature at these higher temperatures without malfunctioning or causing safety hazards.

The other options, such as being connected directly to the appliance plug, smaller size, or mechanical fragility, may or may not differ between thermostats used in electric irons and those in small room heaters, but they are not the main difference between the two.

The thermostats used in irons must be able to operate at these higher temperatures without malfunctioning or causing safety hazards. Therefore, the correct alternative is D: operative at higher temperatures.

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Answer:

10.29 g LiF

Explanation:

First things first we need to remember that M=mol/L, so we have to convert 496 mL to L

469 mL* (1L/1000mL)= 0.496L

Using this value and the molarity equation, we can find moles of LiF

0.8M= mol LiF/ .496L

Mole LiF= .397 moles

To get mass, we need to convert these moles using the molar mass of LiF, which is 25.94 g/mol. We multiply so that the unit of moles cancels out and we are left with grams.

.397 moles * 25.94 g/mol= 10.29 g LiF

Pigments with larger Rf (retention factor) value are more soluble in the chromatography solvent, it would be expected that xanthophylls would travel further than carotenes in chromatography.

Rf value is a measure of how far a particular pigment or compound travels on a chromatography plate relative to the solvent front. It is calculated by dividing the distance traveled by the compound (or pigment) by the distance traveled by the solvent front.

A higher Rf value indicates that a compound is more soluble in the solvent used in the chromatography and therefore moves further up the chromatography plate.

Xanthophylls and carotenes are both types of pigments found in plants and are responsible for the colors seen in fruits and vegetables. Xanthophylls are yellow pigments while carotenes are orange-red pigments.

Xanthophylls are generally more polar and have a higher affinity for the polar stationary phase in chromatography, which would make them more soluble in the solvent and result in a larger Rf value.

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Answer:

The correct answer is D) 7.06.

Explanation:

The first step in solving this problem is to write the balanced chemical equation for the reaction that occurs when HClO and KClO are mixed:

HClO + KClO → K+ + ClO- + HClO

The reaction is a neutralization reaction in which HClO acts as an acid and KClO acts as a base.

Next, we need to calculate the moles of acid (HClO) and base (KClO) that are present in the solution after mixing. We can use the formula:

moles = concentration × volume

For HClO, we have:

moles of HClO = (0.30 mol/L) × (0.200 L) = 0.060 mol

For KClO, we have:

moles of KClO = (0.20 mol/L) × (0.100 L) = 0.020 mol

The HClO will react with the KClO to form ClO- and H3O+ ions:

HClO + ClO- → H2O + ClO2-

So, we can set up an ICE (initial, change, equilibrium) table to determine the concentration of H3O+ ions at equilibrium:

HClO ClO- H3O+

Initial 0.060 M 0.020 M 0 M

Change -x -x +x

Equilibrium 0.060-x 0.020-x x

The value of x represents the concentration of H3O+ ions at equilibrium. We can use the equilibrium concentrations to set up an expression for the acid dissociation constant (Ka) of HClO:

Ka = [H3O+][ClO-] / [HClO]

Substituting in the equilibrium concentrations, we get:

Ka = x^2 / (0.060 - x)

The value of x can be calculated using the quadratic formula:

x = (-b ± sqrt(b^2 - 4ac)) / 2a

where a = 1, b = -Ka, and c = Ka × 0.060.

After substituting these values into the quadratic formula, we get:

x = 7.63 × 10^-5 M

The pH of the solution is given by:

pH = -log[H3O+]

Substituting the value of [H3O+] into this equation, we get:

pH = -log(7.63 × 10^-5) ≈ 4.12

However, we need to consider the dilution factor when mixing the two solutions. The total volume of the solution after mixing is:

V = 200.0 mL + 100.0 mL = 300.0 mL = 0.300 L

The concentration of H3O+ ions in the final solution is:

[H3O+] = x / V = 7.63 × 10^-5 M / 0.300 L ≈ 0.00025 M

Taking the negative logarithm of this concentration gives:

pH = -log(0.00025) ≈ 3.60

Therefore, the pH of the solution is approximately 3.60. This corresponds to answer choice E).

The approximate value of equilibrium concentration of ammonia is 0.001 M. Thus, the correct answer is (B) 0.0010 M.

The balanced chemical equation for the given reaction is:

HNO₂(aq) + NH₃(aq) ⇌ NH₄⁺(aq) + NO₂⁻(aq)

Therefore, the expression for equilibrium constant for this reaction is:

Kc = [NH₄⁺][NO₂⁻]/[HNO₂][NH₃]

At equilibrium, the concentrations of the reactants and products will be related to each other by the equilibrium constant, Kc. We can use the given values of initial concentrations and the volume to calculate the equilibrium concentrations.

We can assume that the initial concentrations of NH₄⁺ and NO₂⁻ are both zero. Let's define x as the change in the concentration of HNO₂, NH₄⁺ and NO₂⁻, and the equilibrium concentration of NH₃.

We can then write the equilibrium concentrations of the species as:

[HNO₂] = 0.20 M - x

[NH₃] = 0.20 M - x

[NH₄⁺] = x

[NO₂⁻] = x

On substituting these expressions in the equilibrium constant expression, we get:

Kc = [(x)(x)] / [(0.20 M - x)(0.20 M - x)]

On simplifying and solving for x, we get:

x² = Kc * (0.20 M)² - Kc * (0.20 M) * x

x² + Kc * (0.20 M) * x - Kc * (0.20 M)² = 0

Using the quadratic formula and solving we get:

x ≈ 0.0010 M

Thus the correct answer is 0.0010 M.

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The total moles of solute present are 0.224 moles in the given solution, under the condition that we have 2.8L of 0.08m solution.

Now to evaluate the number of moles of solute comprised in a solution, we apply the formula:

moles for the given  solute = volume of solution x molarity  (in liters)

Then, we have 2.8L of 0.08m solution.

The molarity of the solution is 0.08m.

The volume of the solution is 2.8L.

Staging these values in the given formula , we get the required value as

moles of solute = 0.08 x 2.8

= 0.224 moles

Hence, there are 0.224 moles of solute present in the given solution.

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The pH of the solution will be equal to the pKa of the acid.The pH of the solution will be equal to the pKa of the acid in the buffer if the concentrations of the acid and conjugate base are equal.

On the off chance that the centralizations of the corrosive and its form base in a support arrangement are equivalent, the pH of the arrangement will be equivalent to the pKa of the corrosive. This is on the grounds that a cushion opposes changes in pH when modest quantities of corrosive or base are added to the arrangement.

At the point when the groupings of the corrosive and its form base are equivalent, the support is supposed to be in its "half-comparability point," implying that portion of the corrosive has been changed over completely to its form base.

Right now, the pH of the cushion will be equivalent to the pKa of the corrosive, which is the pH at which the centralizations of the corrosive and its form base are equivalent. Hence, the right response is "it will be equivalent to the pKa of the corrosive."

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The complete question is:

If the concentrations of the acid and conjugate base in a buffer are equal, what will be true about the pH of a solution? Select the correct answer below: it will be equal to 7 it will be equal to the pks of the conjugate base it will be equal to the pk of the acid impossible to tell.