What is the molar concentration (molarity) of 1.0 mol of KCl dissolved in 750 mL of

solution?

Answer:

15. Lead (II) chloride

16. potassium chloride

17. Lithium oxide

18. Arsenious trioxide

19.Phosphorus tribromide

Explanation:

Answer:

ANSWER

Explanation:

5.0 mol Al produces mass up to 255 g  of Al2O3.

The balanced equation for the reaction is:4Al + 3O2 → 2Al2O3. We have to find the mass of Al2O3 produced when 5.0 mol Al produces up to 2.5 mol Al2O3. To find the mass of Al2O3 produced, we have to follow the steps given below: Step 1: Calculate the number of moles of Al2O3 produced when 5.0 mol Al produces up to 2.5 mol Al2O3.We can use the stoichiometric coefficients of Al and Al2O3 to calculate the number of moles of Al2O3 produced. According to the balanced equation,1 mol Al produces 0.5 mol Al2O3(2.5 mol Al2O3 / 5 mol Al) = 0.5 mol Al2O3Therefore, 5.0 mol Al produces up to 0.5 * 5.0 = 2.5 mol Al2O3Step 2: Calculate the mass of Al2O3 produced when 5.0 mol Al produces up to 2.5 mol Al2O3.To calculate the mass of Al2O3 produced, we can use the molar mass of Al2O3 and the number of moles of Al2O3 produced. The molar mass of Al2O3 is 102 g/mol. Mass of Al2O3 produced = Number of moles of Al2O3 produced * Molar mass of Al2O3= 2.5 mol * 102 g/mol= 255 g. Therefore, 5.0 mol Al produces up to 255 g of Al2O3.

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This means that if you know how many moles of solute you have in the target solution, you also know how many moles of solute were present in the stock solution sample.

Use the molarity and volume of the target solution to determine how many moles of hydrochloric acid,

HCl

, you need in that solution

c

=

n

V

⇒

n

=

c

⋅

V

n

HCl

=

0.10 M

⋅

500

⋅

10

−

3

L

=

0.050 moles HCl

Now the question is - what volume of stock solution would contain this many moles of hydrochloric acid?

c

=

n

V

⇒

V

=

n

c

V

stock

=

0.050

moles

12

moles

L

=

0.0041667 L

I'll leave the answer rounded to two sig figs, despite the fact that you only gave one sig fig for the volume of the target solution

V

stock

=

4.2 mL.follow me

The mole fraction of oxygen gas in air from table 5.3 of the textbook is 0.2095.

In the textbook table 5.3, the mole fraction of oxygen gas in air is 0.2095. The mole fraction refers to the number of moles of a substance in a given solution divided by the total number of moles of all components present in the solution. For air, the other components include nitrogen, carbon dioxide, and other trace gases.

In conclusion, the mole fraction of oxygen gas in air from table 5.3 of the textbook is 0.2095.

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Entropy is an indicator of the randomness of the system. Entropy is a measure of the amount of energy in a system that is unavailable for doing useful work. The greater the entropy, the more randomized the system is, indicating that it is less likely to be able to do useful work.

In this case, we need to rank the following substances from the least to greatest in terms of standard entropy (1 as the least and 4 as the greatest) CO(l) = 2. CO(s) = 1. CO2(g) = 4. CO(g) = 3.Carbon monoxide has a liquid and solid phase at standard pressure, but its gas phase has a higher standard entropy because it is more randomized. CO2 is a more disordered and randomized system than CO because it is a gas. CO has a liquid and solid phase, but they are less disordered than the gas phase because the molecules are more structured. Therefore, the correct answer to the question is: CO(l) = 2. CO(s) = 1. CO2(g) = 4. CO(g) = 3.

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To selectively dissolve iron(III) hydroxide while leaving lead(II) hydroxide unaffected, pH control is used by adjusting the solution to be more basic, exploiting the difference in solubility behavior of the two hydroxides at different pH levels.

To calculate the pH at which a precipitate of iron(III) hydroxide will begin to dissolve, we need to use the solubility product constant (Ksp) for iron(III) hydroxide[tex](Fe(OH)_{3} )[/tex] and the concentration of iron in the solution.

b. To separate lead and iron if they were both precipitated as their hydroxides, pH control can be employed. By adjusting the pH, one of the hydroxide precipitates can be selectively dissolved while the other remains insoluble.

The solubility of a metal hydroxide is typically dependent on the pH of the solution due to the formation of hydroxide complexes or the presence of competing species.

For example, lead(II) hydroxide [tex](Pb(OH)_{2} )[/tex]has low solubility in neutral or slightly basic conditions, while iron(III) hydroxide[tex](Fe(OH)_{3} )[/tex]is more soluble at higher pH values.

Therefore, if both lead and iron hydroxide precipitates are formed, adjusting the pH to be more basic will selectively dissolve the iron(III) hydroxide precipitate while leaving the lead(II) hydroxide precipitate relatively unaffected.

This separation can be achieved by adding a basic solution, such as sodium hydroxide (NaOH), to increase the pH. The lead(II) hydroxide will remain insoluble while the iron(III) hydroxide will dissolve into solution due to the formation of soluble hydroxide complexes.

By carefully controlling the pH, the two metal hydroxide precipitates can be separated.

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The complete balanced overall ionic equation for sodium iodide (NaI) dissolving in water can be written as follows: NaI(s) → Na+(aq) + I-(aq)

In this equation, NaI (s) represents solid sodium iodide, Na+(aq) represents sodium ions in the aqueous solution, and I-(aq) represents iodide ions in the aqueous solution.

When solid sodium iodide is added to water, it dissociates into its constituent ions, sodium ions (Na+) and iodide ions (I-). This dissociation occurs due to the attraction between the positive and negative charges in the water molecules and the ions of the solid.

The resulting solution contains sodium ions and iodide ions, both of which are now freely mobile in the aqueous medium. This dissociation process is reversible, meaning that if the solution is evaporated, the ions can recombine to form solid sodium iodide again.

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Answer:

HCl

Explanation:

is a strong acI'd,,By contrast a weak acid like acetic acid (CH3COOH) does not dissociate well in water

The compounds HCOOH and HCOONa, HF and NaF form a buffer in aqueous solution.

A buffer solution is composed of a weak acid and its conjugate base (or a weak base and its conjugate acid) that can resist changes in pH when small amounts of acid or base are added. Based on this definition, the set of compounds that would form a buffer in aqueous solution is:

HCOOH and HCOONa

HCOOH (formic acid) is a weak acid, and HCOONa (sodium formate) is its conjugate base. Together, they can act as a buffer system in aqueous solution.

The other compounds listed do not form a buffer system:

NaF and KF - These are salts, not weak acid-conjugate base pairs.

HBr and NaBr - These are both strong acids, not weak acid-conjugate base pairs.

HF and NaF - This is a weak acid-conjugate base pair and can form a buffer system.

HF and KCN - These are not weak acid-conjugate base pairs.

KF and KOH - These are both strong bases, not weak acid-conjugate base pairs.

NaBr and KBr - These are salts, not weak acid-conjugate base pairs.

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The maximum electrical work that the cell can accomplish if 80.0 g of Sn is consumed is 87215 Joules (J).

To determine the maximum electrical work that the voltaic cell can accomplish, we need to calculate the maximum cell potential (E°cell) and use it to find the maximum electrical work (Wmax).

First, let's write the half-reactions for the oxidation and reduction processes

Oxidation half-reaction: Sn(s) → Sn₂+(aq) + 2e⁻

Reduction half-reaction: I₂(s) + 2e⁻ → 2I⁻(aq)

Now, we can determine the standard reduction potentials (E°red) for each half-reaction from the ALEKS Data tab

E°red(Sn₂+/Sn) = -0.14 V

E°red(I₂/I-) = 0.54 V

The standard cell potential (E°cell) can be calculated using the formula:

E°cell = E°red(reduction) - E°red(oxidation)

E°cell = 0.54 V - (-0.14 V) = 0.68 V

The maximum electrical work (Wmax) can be calculated using the equation

Wmax = nF E°cell

Where

n = moles of electrons transferred (determined from the balanced equation)

F = Faraday's constant (96485 C/mol)

From the balanced equation, we can see that 2 moles of electrons are transferred per mole of Sn consumed.

Molar mass of Sn = 118.71 g/mol

Number of moles of Sn consumed = 80.0 g / 118.71 g/mol = 0.674 mol

n = 2 moles of electrons/mol of Sn consumed = 2 × 0.674 mol = 1.348 mol

Now we can calculate Wmax

Wmax = (1.348 mol)(96485 C/mol)(0.68 V) = 87215 J

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One mole of C₆H₁₂O₆ is consumed when 6.0 moles O₂ are used in the reaction.

The balanced chemical equation for the reaction is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

For every 6 moles of oxygen gas consumed, one mole of glucose is consumed. The molar ratio of C₆H₁₂O₆ to O₂ is 1:6.The amount of moles of C₆H₁₂O₆ consumed when 6.0 moles O₂ are used is given by:Moles of C₆H₁₂O₆ = Moles of O₂ ÷ 6Moles of C₆H₁₂O₆ = 6.0 ÷ 6Moles of C₆H₁₂O₆ = 1.0

Therefore, one mole of C₆H₁₂O₆ is consumed when 6.0 moles O₂ are used in the reaction.Given that the chemical equation for the reaction is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

The stoichiometric coefficient of O₂ is 6, which means that for every 6 moles of O₂ consumed, one mole of glucose is consumed.The molar ratio of C₆H₁₂O₆ to O₂ is 1:6.

The amount of moles of C₆H₁₂O₆ consumed when 6.0 moles O₂ are used can be calculated by using the molar ratio.Moles of C₆H₁₂O₆

= Moles of O₂ ÷ 6Moles of C₆H₁₂O₆

= 6.0 ÷ 6Moles of C₆H₁₂O₆

= 1.0

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The answer is B. propyl group.A large doublet and a small septet pattern in ¹H NMR spectroscopy indicate the presence of a propyl group in the molecule being analyzed.

In ¹H NMR (proton nuclear magnetic resonance) spectroscopy, the number and arrangement of signals in the spectrum provide information about the chemical environment and connectivity of hydrogen atoms in a molecule. A large doublet and a small septet pattern in ¹H NMR is characteristic of a propyl group.

A propyl group consists of three carbon atoms connected in a chain, with a hydrogen atom attached to each carbon atom. The large doublet arises from the neighboring hydrogens (vicinal protons) on the middle carbon atom, which split the signal into two peaks of equal intensity. The small septet arises from the hydrogens on the two terminal carbon atoms, which split the signal into seven peaks with intensity ratios of 1:6:6:6:6:6:1.

An ethyl group (A) consists of two carbon atoms and does not exhibit a septet pattern. An isopropyl group (C) consists of three carbon atoms but has a different arrangement of hydrogens, leading to a different splitting pattern in the NMR spectrum. A phenyl group (D) is an aromatic ring and typically exhibits different patterns in the NMR spectrum.

A large doublet and a small septet pattern in ¹H NMR spectroscopy indicate the presence of a propyl group in the molecule being analyzed. This pattern arises from the chemical shifts and splitting of hydrogens within the propyl group's carbon chain.

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True. Tetraphosphorus (P4), commonly known as white phosphorus, can form different compounds with chlorine (Cl2) depending on the amount of chlorine present. When chlorine is limited, it forms phosphorus trichloride (PCl3).

White phosphorus, or tetraphosphorus (P4), is a highly reactive and toxic allotrope of phosphorus. When it reacts with chlorine, it can form various compounds. In the case where chlorine is limited or not in excess, the reaction between P4 and Cl2 leads to the formation of phosphorus trichloride (PCl3). Phosphorus trichloride is a colorless and volatile liquid compound that is used in various chemical processes and as a reagent in organic synthesis. It is important to note that in excess chlorine, different compounds such as phosphorus pentachloride (PCl5) can be formed.

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Option (a) is the most true statement based on the provided data, and further testing is needed to identify the specific anion in the unknown solution.

Based on the provided data, the student observed a yellow precipitate when reacting the unknown with the four hypothetical cations A, B, C, and D.

This suggests that the unknown anion is capable of forming a yellow precipitate with these cations. However, without further information or additional tests, it is not possible to definitively conclude the identity of the unknown anion.

Option (a) states that more tests would need to be performed to identify the anion in the unknown. This is the most accurate statement based on the given data. The observed yellow precipitate narrows down the possibilities but does not provide enough information to determine whether the unknown anion is X or Y. Additional tests or data would be required to make a conclusive identification.

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Based on the Lewis diagrams of NH3 and NF3, the correct prediction is that NH3 is a stronger base than NF3.

NH3 has a lone pair of electrons on the nitrogen atom that is available for donation to a proton, making it a Lewis base. In contrast, NF3 has a similar lone pair on nitrogen, but the presence of electronegative fluorine atoms reduces the electron density on nitrogen, making the lone pair less available for donation. The stronger electron availability in NH3 allows it to more readily accept a proton, making it a stronger base compared to NF3.

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Answer:

okie

Explanation:

imma girl

Answer:

Density of cube = 1.59 × 10-⁴ kg/cm³

Explanation:

From the question, the dimensions of the cube are as follows:

Iength, l =0 .045 m, width, w = 0.45dm, height, h = 4.5 mm.

It's mass is 1.45 X 104 mg. What is this cube's density in Kg/cm?

First, all units of length are converted to cm and mass is converted to Kg.

L = 0.045 m = 0.045 m × 100 cm/m = 4.5 cm;

W = 0.45 dm = 0.45 dm × 10 cm/dm = 4.5 cm

Since it is a cube, the height, h = 4.5 cm not 4.5 mm

Mass of cube = 1.45 × 10⁴ mg = 1.45 × 10⁴ mg × 1 × 10-⁶ kg/mg = 0.0145 kg

Density = mass/volume

Volume of cube = s³ or l × w × h

Volume of cube = 4.5 cm × 4.5 cm × 4.5 cm = 91.125 cm³

Density of cube = 0.0145 kg / 91.125 cm³

Density of cube = 1.59 × 10-⁴ kg/cm³

If the concentration of chloride ions (Cl-) is higher outside the cell compared to inside, and the membrane is only permeable to Cl- ions, the correct statement would be:

"Cl- ions will move from the higher concentration outside the cell to the lower concentration inside the cell through the membrane until equilibrium is reached."

This movement of ions occurs due to the principle of diffusion. Diffusion is the passive movement of particles from an area of higher concentration to an area of lower concentration. In this case, since the membrane is permeable only to Cl- ions, they will be the only particles involved in this process. As Cl- ions are more concentrated outside the cell, they will move across the membrane, down their concentration gradient, into the cell. This movement will continue until the concentrations of Cl- ions inside and outside the cell become equal, reaching equilibrium. It's important to note that this process does not require the input of energy, as it occurs spontaneously due to the concentration difference. However, the movement of Cl- ions may have implications for the overall electrochemical balance of the cell, potentially affecting other ion concentrations and membrane potential.

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Answer:

d

Explanation:

Calcium carbonate crystals can be distinguished from bacteria based on several key factors. Firstly, their physical characteristics differ significantly.

Calcium carbonate crystals have a distinct geometric shape, such as rhomboids, hexagons, or prisms, which can be observed under a microscope. In contrast, bacteria are living microorganisms that possess cellular structures, such as membranes, cytoplasm, and genetic material.

Secondly, the size of calcium carbonate crystals tends to be larger and more uniform compared to the varied sizes of bacteria. Additionally, calcium carbonate crystals are inert structures, lacking the metabolic activities and biological functions exhibited by bacteria.

By considering these factors and employing microscopic examination, it is possible to differentiate calcium carbonate crystals from bacteria with a reasonable degree of accuracy.

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Answer:

what

Explanation:

Non-acetone nail polish remover, which typically contains ethyl acetate, does undergo evaporation. Ethyl acetate is a volatile organic compound with a relatively low boiling point.

It is known for its ability to evaporate quickly, making it an effective solvent in nail polish removers. The evaporation process occurs due to the intermolecular forces present in the ethyl acetate molecules. In ethyl acetate, there are two main intermolecular forces at play: dipole-dipole interactions and London dispersion forces. The presence of an oxygen atom and a carbonyl group in the molecule leads to a partial positive charge on the carbon and partial negative charge on the oxygen. This polarity allows for dipole-dipole interactions between neighboring ethyl acetate molecules.

Additionally, ethyl acetate molecules experience London dispersion forces, which arise from temporary fluctuations in electron distribution that induce temporary dipoles. These temporary dipoles can induce similar dipoles in neighboring molecules, leading to attractive forces. As the temperature increases, the kinetic energy of the molecules also increases. This results in an increased likelihood of molecules escaping from the liquid phase and transitioning into the gas phase through evaporation.

Therefore, due to the intermolecular forces present in ethyl acetate and its relatively low boiling point, non-acetone nail polish remover containing ethyl acetate does undergo evaporation.

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Answer:

0.35moles

Explanation:

when 156g of Al reacts with 2molesof Al2O3 then 27g of Al reacts with what then u cross multiply and solve ur answer

0.35moles of  Al[tex]_2[/tex]O[tex]_3[/tex]  will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex]. A mole consists of precisely 6.022× 10²³particles.

A mole is just a measuring scale. In reality, it's one of the International System of Units' seven foundation units (SI). When already-existing units are insufficient, new ones are created. The levels at which chemical reactions frequently occur exclude the use of grams, yet utilizing actual numbers of atoms, molecules, or ions would also be unclear.

A mole consists of precisely 6.022× 10²³particles. The "particles" might be anything, from tiny things like electrons and atoms to enormous things like stars or elephants.

4 Al + 3 O[tex]_2[/tex] → 2 Al[tex]_2[/tex]O[tex]_3[/tex]

moles of aluminium = 27 /26=1.03moles

The mole ratio between Al and  Al[tex]_2[/tex]O[tex]_3[/tex] is 2:1

mole of  Al[tex]_2[/tex]O[tex]_3[/tex]= 0.35moles

Therefore, 0.35moles of  Al[tex]_2[/tex]O[tex]_3[/tex]  will be formed when 27 grams of Al reacts completely with O[tex]_2[/tex].

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The electron configurations for each of the following ions are as follows:

A. Cl⁻: 1s² 2s² 2p⁶ 3s² 3p⁶

B. K⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

C. P3⁻: 1s² 2s² 2p⁶ 3s² 3p⁶

D. Mo³⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰

E. V³⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²

Electronic configuration refers to the arrangement of electrons in the energy levels, orbitals, and sub-orbitals of an atom or ion. It describes the distribution of electrons among the various energy levels and subshells within an atom. The electronic configuration provides information about the organization and stability of an atom, as well as its chemical properties. It is typically represented using a notation that indicates the number of electrons in each energy level and subshell, such as the superscript notation (e.g., 1s² 2s² 2p⁶) used to represent the electronic configuration of an atom.

Therefore, the electron configurations for each of the following ions are as follows:

A. Cl⁻: 1s² 2s² 2p⁶ 3s² 3p⁶

B. K⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

C. P3⁻: 1s² 2s² 2p⁶ 3s² 3p⁶

D. Mo³⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰

E. V³⁺: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d²

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Answer:

units of length per time

Explanation:

Carboxylic acids are organic acids that contain the carboxyl functional group (–COOH) as their structural feature.  the structures of the carboxylic acids with the formula C6H12O2 that contain an ethyl group branching off the main chain are pentanoic acid and 3-methylbutanoic acid.

They can be found in various organic materials such as fruits, fats, and oils. The structure(s) of carboxylic acids with the formula C6H12O2 that contain an ethyl group branching off the main chain can be represented as follows:Two isomers can be possible for the given formula C6H12O2. They are pentanoic acid and 3-methylbutanoic acid.Pentanoic acid has a straight-chain of five carbon atoms (pentane) with a carboxyl group at one end and an ethyl group branching off from the fourth carbon atom. The structure of pentanoic acid is as follows:3-Methylbutanoic acid is a branched-chain carboxylic acid in which the carboxyl group is attached to the third carbon atom of a four-carbon chain, with an ethyl group attached to the second carbon atom. The structure of 3-methylbutanoic acid is as follows:Therefore, the structures of the carboxylic acids with the formula C6H12O2 that contain an ethyl group branching off the main chain are pentanoic acid and 3-methylbutanoic acid.

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Given,Initial volume, Vi = 10-3 m3Pressure, P = 10^4 PaTemperature, T1 = 25°CAvogadro's Number, NA = 6.022×1023 atoms/molAtomic weight of Argon gas, m = 0.040 kg/mole

Explanation: 1) What is the number density of atoms in this chamber?Number density is given by:N/V = PNAT1V1 = 10^4×6.022×1023/8.314×298×10-3N/V = 2.4299 × 1024 atoms/m3Therefore, the number density of atoms in the chamber is N/V = 2.4299 × 1024 atoms/m3

2) What is the new temperature, T?Volume of the container is changed from V1 to V2Pressure remains constantTemperature of the gas changes from T1 to T2Since the expansion is free expansion, the internal energy of the gas remains constantFor an ideal gas,U = (3/2)Nk(T2 - T1)Where k is the Boltzmann constant or the gas constant divided by the Avogadro number k = R/NA = 8.314/6.022×1023 = 1.381×10-23 JK-1Therefore, U = (3/2)PV(T2 - T1)/kV1 = (3/2)(P/NA)(T2 - T1)V1/kV2 = V1 × 3 = 3×10-3m3T2 = T1 × V1/V2T2 = 25 × 10-3/3 = 8.33°CThus, the new temperature T is T = 8.33°C

3) What is the new pressure, P?According to Boyle's Law, P1V1 = P2V2P2 = P1V1/V2P2 = 10^4×10-3/(3×10-3)P2 = 3333 PaTherefore, the new pressure is P2 = 3333 Pa

4) How much work is needed to do this?In the compression process, work is done on the system.W = -∫PdVWhere, P = P(V) is the pressure as a function of the volume V.The compression is done slowly and isothermal, which means that the temperature remains constant at T1 = 25°CSo the ideal gas law,PV = NkTTemperature remains constant during the compression,So, P = NkT/V = nRT/VWhere n is the number of moles of gas and R is the molar gas constantWe have seen before thatN/V = P/kTRearranging this expression gives us N = (PV/kT)Therefore,W = -∫PdV = -∫(nRT/V)dV = -nRT ln(Vf/Vi)The amount of gas remains constant, so n is constant.The final volume is Vf = Vi = 10-3 m3W = -nRT ln(Vf/Vi)W = -PV ln(Vf/Vi)Since Vf/Vi = 1/3,W = -PV ln(1/3)W = PV ln(3)W = 10^4 × 10-3 × 0.040 × 8.31 × ln(3)W = -106.6 JThus, the amount of work needed to compress the gas back to its initial volume is W = -106.6 J.

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Answer:

ITS TRUE!!!!!

Answer:

A, C, D

Explanation: