find the percent by volume concentration for 50.00 ml of a 50% nacl solution added to more solvent to make 120.00ml of solutions

The concentration of dpip is 0.02 mmol/L.

To calculate the concentration of dpip, we can use the Beer-Lambert Law, which states that the absorbance (A) of a solution is directly proportional to the concentration (c) of the absorbing species and the path length (l) of the sample cell:

A = εcl

where;

In this case, we are given the absorbance value (A) and the molar extinction coefficient (ε), so we can rearrange the equation to solve for the concentration (c):

c = A / (εl)

Substituting the given values, we get:

c = 0.426 / (21.3/(mm cm) x 1 cm)

c = 0.426 / 21.3

c = 0.02 mmol/L

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The pH of the solution that is made by combining 55 ml of 0.040 m hydrofluoric acid with 125 ml of 0.100 m sodium fluoride is equal to 4.71.

Figure out the amount of hydrogen ions (H+) in the solution in order to compute the pH of the solution. This may be accomplished by taking into account the acid-base equilibrium between fluoride ions (F-), the conjugate base of hydrofluoric acid (HF), and the acid.

First, let's find the moles of (HF) and (NaF) in the solution:

Moles of HF = volume (in L) × concentration (in M)

= 0.055 L × 0.040 M

= 0.0022 moles

Moles of NaF = volume (in L) × concentration (in M)

= 0.125 L × 0.100 M

= 0.0125 moles

The common ion concentration of F⁻ in the solution must then be determined. This is as a result of the existence of sodium fluoride and hydrofluoric acid, both of which contain fluoride ions:

Common ion concentration of F⁻ = moles of F⁻ / total volume (in L)

= (0.0022 moles + 0.0125 moles) / (0.055 L + 0.125 L)

= 0.0147 moles / 0.180 L

= 0.0817 M

Next, set up the equilibrium expression for the acid dissociation of (HF):

HF ⇌ H⁺ + F⁻

The hydrofluoric acid dissociation constant, Ka, serves as the equilibrium constant for this process.

Next, it is required to calculate the value of Ka for hydrofluoric acid. The Ka value for HF is 7.2 × 10⁻⁴ at 25°C.

Apply the equation for the acid dissociation constant (Ka):

Ka = [H⁺][F⁻] / [HF]

Set the equation to solve for [H⁺]:

[H+] = Ka × [HF] / [F⁻]

= (7.2 × 10⁻⁴) × (0.0022 M) / (0.0817 M)

= 1.94 × 10⁻⁵ M

The concentration of [H+] in the solution is 1.94 × 10⁻⁵ M.

Finally, find the pH using the formula:

pH = -log10[H⁺]

= -log10(1.94 × 10⁻⁵)

= 4.71

Thus, the pH of the solution is 4.71.

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To the percentage yield for a reaction, you take the actual yield and divide by the theoretical yield and multiply by 100.

Yield also referred to as reaction yield in chemistry, is a measure of the quantity of moles of a product formed in relation to the reactant consumed and expressed as a percentage.

Percent Yield is defined as the actual yield divided by the theoretical yield times 100 i.e.

Percent yield = actual yield/theoretical yield × 100

The percent yield is determined by calculating the ratio of actual yield/theoretical yield.

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An ion with a positive charge is called a cation, whereas an ion with a negative charge is called an anion.

An ion with a positive charge is called a cation, whereas an ion with a negative charge is called an anion. Ions are atoms or molecules that have lost or gained one or more electrons, giving them a positive or negative charge. Ions play a crucial role in many chemical reactions and are found in a variety of materials.

Ions are classified as cations and anions based on their charge.

Cations: Cations are ions that have lost one or more electrons and have a positive charge. Sodium ion (Na+) is an example of a cation. Sodium atoms lose one electron, giving them a positive charge.

Anions: Anions are ions that have gained one or more electrons and have a negative charge. Chloride ion (Cl-) is an example of an anion. Chlorine atoms gain an electron, giving them a negative charge.

Thus, an ion with a positive charge is called a cation, whereas an ion with a negative charge is called an anion.

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The compound that has a boiling point closest to that of Argon is HF. This is because HF has the strongest intermolecular forces (hydrogen bonding) among the given compounds.

The boiling point of a compound depends on the strength of the intermolecular forces that exist between the molecules. The stronger the intermolecular forces, the higher the boiling point.

The weaker the intermolecular forces, the lower the boiling point. The boiling point of Argon is -186°C. Out of the given compounds, the boiling point of HF is the closest to the boiling point of Argon.

The boiling point of HF is -83.8°C. This is because HF has hydrogen bonding which is the strongest intermolecular force among the given compounds. The other compounds such as Cl2, F2, HCl, and NaF, have weaker intermolecular forces than HF. Therefore, they have a lower boiling point than HF.

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NaOH is a strong base and completely dissociates in water. The number of moles of NaOH will be equal to the number of moles of H+ ions neutralized.  Hence, 99 ml of NaOH must be added.

It measures the acidity or basicity of a solution on a scale of 0 to 14. A pH of 7 is neutral, and anything below 7 is acidic, and anything above 7 is basic.

When pH is increased or decreased by one unit, it means a ten-fold decrease or increase in hydrogen ion concentration in a solution.Acid and base are two essential terms to learn here.

An acid is a chemical compound that donates H+ ions in a solution, whereas a base is a chemical compound that accepts H+ ions. These H+ ions determine the acidity of the solution.

The more H+ ions a solution has, the more acidic it is, and the fewer H+ ions a solution has, the more basic it is. A pH of 2 indicates that the solution is highly acidic.

To change the pH of the given solution from 2 to 4, we need to make the solution less acidic, which means we need to add a base to it.

Let the volume of the base we need to add be x ml.The pH of the new solution will be 4. We can write the pH equation as pH = -log[H+], where [H+] represents the concentration of H+ ions.

The concentration of H+ ions in the initial solution is:2 = -log[H+]. Hence, [H+] = 0.01 M.The concentration of H+ ions in the final solution is:4 = -log[H+].

Hence, [H+] = 0.0001 M.We know that[H+] = Acid concentration = Base concentration.Hence, the concentration of NaOH added to the solution will be 0.01 M - 0.0001 M = 0.0099 M.

NaOH is a strong base and completely dissociates in water. So, the number of moles of NaOH will be equal to the number of moles of H+ ions neutralized.

The volume of NaOH needed to achieve this concentration:0.0099 mol/L = n NaOH / V NaOHn NaOH = 0.0099 mol/L x (10 mL + x) = 0.099 molV NaOH = n NaOH / 0.1 mol/L = (0.0099 mol) / (0.1 mol/L) = 0.099 L = 99 ml

Hence, 99 ml of NaOH must be added to 10 ml of a solution of HCl with a pH of 2 to change the pH to 4.

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The

molarity

of the KOH solution is 0.2709 M.

Molarity is the number of moles of solute per liter of solution.

The molarity of the KOH solution in order to determine how much of it is needed to titrate a sample of 0.2452 M H2SO4.

Molarity (KOH) = (Number of moles of KOH used in titration) ÷ (Volume of KOH used in titration)

The number of moles of KOH used in the

titration

.

Number of moles of KOH = (Molarity of H2SO4) x (Volume of H2SO4)

Number of moles of KOH = 0.2452 M x 20.00 mL = 4.904 x 10-3 moles

Molarity (KOH) = (4.904 x 10-3 moles) ÷ (18.15 mL) = 0.2709 M

Therefore, the molarity of the KOH solution for 0.2452 m h2so4 solution is 0.2709 M.

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using many methods I gess I am not good at drawing

The reaction has reached its equivalence point once it is complete.

To determine if the reaction has reached its equivalence point once the reaction is complete, we must first calculate the moles of each compound:

HCl moles = 1.0 M x (10.0 mL / 1000 mL/L) = 0.01 mol

NaOH moles = 2.0 M x (5.0 mL / 1000 mL/L) = 0.01 mol

The two compounds react in a 1:1 ratio.

There are now no more moles of HCl or NaOH left to react since they have equal moles.

We can thus conclude that the reaction has reached its equivalence point as soon as the reaction is over. Since the moles of both HCl and NaOH have been completely neutralized, the pH at the equivalence point is 7.

This indicates that the reaction has reached its equivalence point once it has finished.

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The given statement "at a given temperature and pressure, the volume of a gas is directly proportional to the amount of gas present" is a rephrasing of Avogadro's law.

Avogadro's law is a gas law named after Amedeo Avogadro, an Italian scientist who first presented it in 1811. It states that "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules.

This means that if the amount of gas present is doubled, the volume will also double, provided that the temperature and pressure remain the same.

Therefore, at a given temperature and pressure, the volume of a gas is directly proportional to the amount of gas present. This is a statement of Avogadro's Law.

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71.5 kJ of heat is released when 0.250 moles of hydrogen gas react with the required amount of oxygen.

When hydrogen reacts with oxygen, it produces water and releases heat. This is an exothermic reaction with a high energy yield, and it is often used in rocket propulsion.

The balanced chemical equation for the reaction between hydrogen and oxygen is:

2H2(g) + O2(g) → 2H2O(l) + energy

From the balanced equation, we can see that 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water. Therefore, the amount of oxygen required to react with 0.250 moles of hydrogen is 0.125 moles.

Assuming the reaction occurs at constant pressure and temperature, we can use the equation:

ΔH = Q / n

where ΔH is the enthalpy change, Q is the heat released or absorbed by the reaction, and n is the number of moles of the limiting reactant (in this case, hydrogen).

The enthalpy change for the combustion of hydrogen gas is -286 kJ/mol. Therefore, the heat released by the reaction of 0.250 moles of hydrogen is:

Q = ΔH x n = -286 kJ/mol x 0.250 mol = -71.5 kJ

Note that the negative sign indicates that the reaction is exothermic and releases heat.

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From the given reactions, another quantity that is equal to ΔH degree reaction is 1. enthalpy of combustion, 2. 4x bond energy of carbon-hydrogen bond, 3. enthalpy of formation and 4. -4x bond energy of CH bond.

Hence, the correct option is A.

Enthalpy of a reaction is defined as the total sum of the heat of the system in the reaction and the product of the pressure and volume of the system. In the first reaction, the enthalpy of combustion of methane in the presence of oxygen is calculated, which gives the change in heat during burning.

In the second reaction, bond breaking will give the heat change as 4x bond energy of the carbon and hydrogen bond is endothermic.

In the third reaction, the enthalpy of formation of methane will give the change in the enthalpy.

In the fourth reaction, the difference between the bond energies of the reactants and the products that are -4x bond energy of carbon and hydrogen will result in enthalpy change.

Hence, the bond of combustion and formation can be a component along with enthalpy.

Hence, the correct option is A.

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Robert Boyle helped dispel the ancient Greek theory of the four elements, which stated that all matter was made up of earth, air, fire, and water.  

Boyle's experiments with gases led to the development of the modern concept of an element as a fundamental substance that cannot be broken down into simpler substances.

The tray of ice will weigh the same as the starting tray of water. This is because the mass of the water is conserved during the freezing process. Although the water changes from a liquid to a solid state, the total earth amount of matter remains the same.

Ice melting is a physical change. A physical change is a change that does not result in the formation of a new substance with different chemical properties. When ice melts, it simply changes from a solid to a liquid state, but the chemical composition of the water remains the same.

Intensive properties are properties that do not depend on the amount of matter present. Examples include temperature, density, and color. Extensive properties, on the other hand, depend on the amount of matter present. Examples include mass, volume, and energy. In other words, if you double the amount of matter present, the value of an extensive property will also double, but the value of an intensive property will remain the same.

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Splicing, polyadenylation, and glycosylation are the post-transcriptional modifications that are likely involved in the IAV life cycle. Therefore, the correct option is C. I and III only.

Splicing is the process by which introns are removed from the pre-mRNA transcript, while exons are joined together. Polyadenylation involves adding a poly(A) tail to the 3' end of the pre-mRNA transcript.

Glycosylation is the process by which sugar molecules are added to proteins or lipids, making them more stable and resistant to degradation.

Influenza A virus (IAV) relies on post-transcriptional modifications for the synthesis of viral proteins, which are essential for the virus's replication and survival.

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Answer: The number of atoms in the peptide backbone that are linked together to form one turn of the alpha helix axis is 3.1415.

The α-helix is a secondary structure motif that is found in proteins. The helix is stabilised by hydrogen bonds between the carbonyl oxygen atom of one amino acid residue and the amide hydrogen atom of the amino acid four residues downstream.

The α-helix is a right-handed helix that has approximately 3.6 amino acid residues per turn of the helix, with a helix rise of 0.15 nm and a helix pitch of 0.54 nm. The alpha helix is composed of a sequence of amino acids that form a spiral structure, which is held together by hydrogen bonds.

The main chain atoms of the α-helix make a screw-like pattern, and this helical pattern is produced by the carbonyl group of every nth amino acid that donates a hydrogen bond to the nitrogen atom of the (n+4)th amino acid, resulting in a tightly coiled backbone structure.

This backbone of the α-helix is a repeating pattern of atoms, with a pitch of 5.4 Å along the helix axis.

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Water molecules can exist as solids, liquids, or gases because of the unique properties of hydrogen bonding.

Hydrogen bonds are weak chemical bonds that form between hydrogen atoms of one molecule and oxygen atoms of another molecule. In water, each molecule can form up to four hydrogen bonds with its neighboring molecules, which gives water its unique properties.

When water molecules are in a solid state (ice), they are tightly packed and held together by hydrogen bonds, which results in a rigid, crystalline structure.

In a liquid state, water molecules still have hydrogen bonds, but they are more spaced out and can move around freely, resulting in a fluid state.

In a gaseous state, water molecules are moving rapidly and have weak or no hydrogen bonds, resulting in a state where they can expand and fill any container they are placed in.

Therefore, the ability of water molecules to exist as solids, liquids, or gases is due to the nature of hydrogen bonding and the varying degree of interactions between water molecules in different states.

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There are 1.49 × 10²³ formula units of potassium nitrate in a 25 g sample.

One formula unit is defined as the simplest formula of a substance, which indicates the relative amounts of the elements in the molecule. As a result, the number of formula units in a sample can be calculated by dividing the sample's mass by the substance's molar mass.

The molecular formula of potassium nitrate is KNO3. It contains one potassium atom (K), one nitrogen atom (N), and three oxygen atoms (O). The atomic masses of the elements can be used to calculate the molar mass of the compound.

One potassium atom has a molar mass of 39.1 g/mol, one nitrogen atom has a molar mass of 14.0 g/mol, and three oxygen atoms have a combined molar mass of 48.0 g/mol.

The molar mass of KNO3 = (1 × 39.1 g/mol) + (1 × 14.0 g/mol) + (3 × 16.0 g/mol) = 101.1 g/mol.

Now, on dividing the sample's mass (25 g) by the molar mass of potassium nitrate (101.1 g/mol), a value of 0.247 mol is obtained. The Avogadro constant can be used to convert moles into formula units. The Avogadro constant, 6.022 × 10²³ formula units per mole, represents the number of formula units in one mole of a substance.

The number of formula units = (0.247 mol) × (6.022 × 10²³ formula units/mol) = 1.49 × 10²³ formula units.

Therefore, there are 1.49 × 10²³ formula units of potassium nitrate in a 25 g sample.

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Experimental error could have arisen if there was an oily layer on top of the reaction mixture when the 3 m sulfuric acid was added.

This could have caused the acid to not mix properly with the reaction mixture, resulting in an incomplete reaction and possibly erroneous results.

To avoid this, the oil layer should be removed before adding the sulfuric acid. This can be done by gently heating the mixture and allowing the oil to evaporate.

The reaction mixture can then be cooled and the sulfuric acid added. Alternatively, the oil layer can be separated by pouring the reaction mixture through a filter.

This will ensure that the sulfuric acid is properly mixed with the reaction mixture, yielding accurate results.

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The addition of a catalyst from the list below will not alter the reaction rate of an equilibrium chemical system.

The chemical equilibrium is unaffected by a catalyst. That just quickens a response. In actuality, a catalyst quickens both the forward and backward reaction. As we increase the pressure, the response changes in a way to offset that effect, so changing the pressure has no influence on the equilibrium constant.

The equilibrium position of a reversible reaction can be impacted by variations in concentration, temperature, and pressure. Chemical reactions are equilibrium reactions.

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If the astronomer's claim is correct and igneous rock was formed from material that was originally in sedimentary rock on the surface of Acer, then the process that likely occurred is called "igneous intrusion."

Igneous intrusion happens when molten rock, known as magma, is forced into layers of sedimentary rock, which is formed from the accumulation of sediments like sand, mud, or organic matter. As the magma intrudes into the sedimentary rock, it heats up the surrounding rocks and causes them to partially melt and recrystallize. Over time, as the magma cools and solidifies, it forms igneous rock.

The process of igneous intrusion can also cause the sedimentary rock layers to fold or deform, creating features like faults, folds, and uplifts. These changes in the sedimentary rock can be used by geologists to understand the history and geology of a particular region.

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It appears that you are attempting to identify the various elements of each of these tests shown in the scenarios for this topic.

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The balanced equation for the formation of aspirin is as follows:

[tex]C_7H_6O_3 + C_4H_6O_3[/tex] → [tex]C_9H_8O_4 + C_2H_4O_2[/tex]

The equation is balanced as there are equal numbers of atoms for each element on both sides.

The chemical formula of aspirin is [tex]C_9H_8O_4[/tex] which is obtained by reacting acetic anhydride ([tex]C_4H_6O_3[/tex]) with salicylic acid ([tex]C_7H_6O_3[/tex]). The reaction also produces acetic acid ([tex]C_2H_4O_2[/tex]) as a by-product.

The balanced chemical equation for the reaction is:

[tex]C_7H_6O_3 + C_4H_6O_3[/tex] → [tex]C_9H_8O_4 + C_2H_4O_2[/tex]

Salicylic acid is an organic acid that is found in various plants, including willow trees and is commonly used to treat pain and fever. Aspirin is a synthetic form of salicylic acid that is commonly used to treat pain and fever as well. It is one of the most widely used drugs in the world today.

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The basicity of the acid is equal to the number of moles of NaOH that reacted with one mole of acid. Since we know that 0.00025 moles of NaOH reacted with 0.01873 moles of acid.

What is Neutralization?

Neutralization is a chemical reaction that occurs when an acid and a base react with each other to form a salt and water. In this reaction, the hydrogen ions (H+) from the acid combine with the hydroxide ions (OH-) from the base to form water (H2O), and the remaining ions combine to form a salt. The resulting solution will have a pH that is closer to neutral (pH 7) than either the original acid or base.

First, let's calculate the number of moles of NaOH used in the reaction:

10 mL NaOH x (1 L / 1000 mL) x (1/2) x (1 mol NaOH / 20 mL N/2 HCl) = 0.00025 mol NaOH

Since the acid and NaOH react in a 1:1 ratio, this means that there were also 0.00025 moles of acid used in the reaction.

Next, we can use the mass of the acid and its molecular weight to calculate the number of moles of acid:

2.362 g acid x (1 mol acid / 126 g acid) = 0.01873 mol acid

Since the acid and NaOH react in a 1:1 ratio, we know that there were 0.01873 moles of NaOH used in the reaction.

After the reaction, the solution was diluted to a total volume of 250 mL. This means that the concentration of the acid in the diluted solution is:

0.01873 mol / 0.25 L = 0.07492 M

Finally, we can use the information about the neutralization of the diluted solution to calculate the basicity of the acid:

10 mL diluted solution x (1 L / 1000 mL) x (1/10) x (1 mol acid / 1 mol H+) = 0.001 mol acid

This means that the 10 mL of diluted solution contained 0.001 moles of acid. Since the concentration of the diluted solution is 0.07492 M, the volume of the 10 mL of diluted solution contains:

0.001 mol / 0.07492 mol/L = 0.01335 L = 13.35 mL

This means that the 10 mL of diluted solution contains 13.35 mL of the original acid solution. Since the original acid solution was diluted from 50 mL to 250 mL, this means that the 13.35 mL of the original acid solution corresponds to:

13.35 mL x (50 mL / 250 mL) = 2.67 mL of the original acid solution

Therefore, the 2.67 mL of the original acid solution contained 0.001 moles of acid, which corresponds to a concentration of:

0.001 mol / 0.00267 L = 0.3745 M

The basicity of the acid is equal to the number of moles of NaOH that reacted with one mole of acid. Since we know that 0.00025 moles of NaOH reacted with 0.01873 moles of acid, the basicity of the acid is:

0.00025 mol NaOH / 0.01873 mol acid = 0.01336

Therefore, the basicity of the acid is 0.01336.

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When we convert the pressure of 84.2 mmHg to torr, the result obtained is 84.2 torr

The following data were obtained from the question:

The conversion scale of converting pressure (in mmHg) to pressure (in torr) is given as follow:

760 mmHg = 760 torr

Using the above, scale, we can convert 84.2 mmHg to torr as follow:

760 mmHg = 760 torr

Therefore,

84.2 mmHg = 84.2 torr

From the above calculation, we can conclude that the pressure (in torr) is 84.2 torr

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Answer: To solve this problem, we need to use the Avogadro's number, which represents the number of particles (molecules or atoms) in one mole of a substance. The Avogadro's number is approximately 6.022 x 10²³ particles per mole.

First, we need to calculate the number of moles of CO₂ molecules in 2.5 x 10²⁵ molecules:

n = N/N_A

where:

n = number of moles

N = number of molecules

N_A = Avogadro's number

n = 2.5 x 10²⁵ / 6.022 x 10²³

n = 41.56 mol

Next, we can use the molar mass of CO₂ to convert moles to grams. The molar mass of CO₂ is approximately 44 grams per mole.

m = n x M

where:

m = mass in grams

n = number of moles

M = molar mass

m = 41.56 mol x 44 g/mol

m = 1826.24 g

Therefore, there are approximately 1826.24 grams in 2.5 x 10²⁵ CO₂ molecules.

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Explanation:

The formula of an ionic compound must first be charged. After identifying the anion, take note of its symbol and charge. The next step is to unite the two ions to form a electrically neutral molecule.

An ionic connection forms as a result of the complete passage of certain electrons from one atom to another. An atom loses two or more electrons, forming a negative charges ion called a cation. An atom receives one or more electrons, resulting in the formation of an anion, and negatively charged ion.

Granules, oxides, hydroxides, sulphides, or the majority all inorganic compounds are examples of ionic compounds. The electrostatic interaction between the negative and positive ions holds ionic solids together. As an illustration, sodium ions draw chloride ions, and chloride ions draw sodium ions.

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Explanation:

25 g   *   (100 - 25 ) C  *  4.184  J / (g C)  = 7845 J

Answer:

Sublimation, the dry ice changes to a gas, solid to gas is sublimation

Boric acid has a hydrogen-bonded layer structure in the solid state is incorrect.

Boric acid, also known as orthoboric acid or H3BO3, has a three-dimensional (3D) structure in the solid state, which is also known as a "network structure".

The main component of the structure is a covalent bond between the boron and oxygen atoms, known as a 2c-2e bond.

This network structure is formed when hydrogen bonds join the oxygen atoms to each other, thus forming a 3D framework.

Borazine (B3N3H6) consists of planar molecules, with three-membered rings of alternating nitrogen and boron atoms that are connected by single bonds.

Borazine has no hydrogen bonds, and all the boron-nitrogen bonds are 2c-2e bonds. Therefore, the statement Boric acid has a hydrogen-bonded layer structure in the solid state is incorrect.

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