if you remove a chemical or heat from a system, will the system shift toward the side that replaces what you took out or try to use even more of its?

We need to understand that temperature is a measure of the average kinetic energy of the particles in a substance, whereas internal energy is the total energy of all the particles in a substance, including kinetic and potential energy.

Given that gas A registers a slightly higher temperature than gas B when measured using a thermometer, we can conclude that the average kinetic energy of the particles in gas A is higher than that in gas B. However, this does not necessarily mean that gas A has more internal energy.

To determine which gas has more internal energy, we need to consider other factors such as the mass and specific heat capacity of the gases, as well as any changes in their state or conditions in summary, a higher temperature reading on a thermometer only indicates a higher average kinetic energy of the particles in a substance, but does not necessarily indicate which substance has more internal energy. Therefore, we cannot make a definitive conclusion about which gas has more internal energy based solely on the temperature readings.

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The prefixes gluc/o and glyc/o both refer to sugar.

The explanation for this is that both prefixes are derived from the Greek word "glykys," which means sweet. Gluc/o is typically used to refer to glucose, which is a simple sugar that is the primary source of energy for the body.

Glyc/o is a more general term that can refer to any type of sugar, including complex carbohydrates like starches.

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The prefixes gluc/o and glyc/o both refer to glucose or sugar.

Both prefixes are derived from the Greek word "glykys," which means sweet. Gluc/o is commonly used in scientific terminology, while glyc/o is often used in medical terminology.
In medical terminology, the prefixes gluc/o and glyc/o are used interchangeably to denote glucose, which is a simple sugar and an essential source of energy for living organisms. These prefixes are commonly used in words related to glucose metabolism and its related conditions, such as glycemia (blood sugar level) or glucagon (a hormone that raises blood sugar).
In summary, gluc/o and glyc/o are prefixes that represent glucose or sugar in medical terms, and they are used to describe various aspects of glucose metabolism and related conditions.

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Answer:

It depends on the acid.

Explanation:

The conjugate base for a Brønsted-Lowry acid is the product which is produced for the acid losing a proton. For example, the conjugate base of NH3 in:

NH3 (aq) + H2O (l) -> NH4^+ (aq) + OH^-

would be NH4^+/ the base produced from NH3 donating a H+ proton.

The pH difference between solution A and solution B is tenfold, indicating that solution A is more acidic than solution B. It's essential to note that the pH scale is logarithmic. option c.

pH is a measure of the acidity or alkalinity of a solution on a scale of 0 to 14, with 0 being the most acidic and 14 being the most alkaline. Each unit on the pH scale represents a tenfold difference in acidity or alkalinity. Therefore, if solution A has a pH of 2 and solution B has a pH of 3, solution A is ten times more acidic than solution B.
To calculate the difference in acidity between the two solutions, we can use the formula:
pH difference = 10^(pH of solution A - pH of solution B)

Substituting the given values into the formula, we get:
pH difference = 10^(2 - 3) = 10^-1 = 0.1
Therefore, solution A is 0.1 times (or 10 times) more acidic than solution B. Alternatively, we could say that solution B is 10 times less acidic than solution A. So, even small changes in pH can have a significant impact on the acidity of a solution. option c.

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The half-life of a reaction is the time it takes for half of the initial concentration of the reactant to be consumed. The first three successive half-lives can be used to calculate the rate constant (k) of the reaction.

The first half-life (t1/2) is given as 48 min, which means that after 48 min, [A] = [A]0/2 = 2.0 M. The second half-life is 96 min, which means that after 96 min, [A] = [A]0/2^2 = 1.0 M. The third half-life is 192 min, which means that after 192 min, [A] = [A]0/2^3 = 0.5 M. The rate law for a first-order reaction is: rate = k[A], where [A] is the concentration of the reactant at any given time. The integrated rate law for a first-order reaction is: ln([A]t/[A]0) = -kt, where [A]t is the concentration of the reactant at time t.

Using the concentrations and times for the first three half-lives, we can set up the following equations:

ln(2.0 M/4.0 M) = -k(48 min)
ln(1.0 M/4.0 M) = -k(96 min)
ln(0.5 M/4.0 M) = -k(192 min)

Simplifying these equations, we get:
ln(1/2) = -k(48 min)
ln(1/4) = -k(96 min)
ln(1/8) = -k(192 min)

Now, we can use these equations to solve for k. Taking the first equation, we get:
ln(1/2) = -k(48 min)
k = -ln(1/2)/48 min
k = 0.0145 min^-1

Similarly, we can solve for k using the second and third equations:
k = 0.00723 min^-1
k = 0.00362 min^-1
Taking the average of these three values, we get:
k = (0.0145 + 0.00723 + 0.00362)/3
k = 0.00845 min^-1

Therefore, the rate constant (k) for the given reaction is 0.00845 min^-1.

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The element with a molar mass closest to 58.67 g/mol is nickel (Ni), which has a molar mass of 58.69 g/mol. Therefore, the element is nickel.

To identify the element, we'll first calculate the molar mass. In a face-centered cubic lattice, there are 4 atoms per unit cell. The unit cell volume can be calculated as V = (0.352 nm)^3 = 4.37 x 10^-23 cm^3. Given the density, we can find the mass of the unit cell: mass = density x volume = 8.90 g/cm^3 x 4.37 x 10^-23 cm^3 = 3.89 x 10^-22 g.

Now, we can determine the molar mass: molar mass = (mass of unit cell) / (number of atoms per unit cell) x Avogadro's number = (3.89 x 10^-22 g) / 4 x 6.022 x 10^23 = 58.67 g/mol.

The element with a molar mass closest to 58.67 g/mol is nickel (Ni), which has a molar mass of 58.69 g/mol. Therefore, the element is nickel.

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Ethanol can be separated from a mixture by a process called fractional distillation.

This method is used to separate a mixture of two or more liquids with different boiling points. In this case, ethanol will be separated from the other two components in the mixture. The first step is to set up a fractional distillation apparatus. This consists of a round bottom flask with a heating mantle, a distillation column packed with glass beads or other material, and a condenser. The round bottom flask is filled with the mixture to be separated, and the apparatus is assembled.

Next, the mixture is heated gradually using the heating mantle. As the temperature increases, the components of the mixture with lower boiling points will begin to vaporize and rise up the distillation column. In this case, ethanol will be the first component to vaporize. The vaporized ethanol will then travel up the distillation column and into the condenser, where it will be cooled and condensed back into a liquid form. This liquid can then be collected in a separate flask.

The process is continued until all of the ethanol has been collected. The other two components in the mixture will remain in the round bottom flask, as they have higher boiling points and will not vaporize at the temperature used.

In conclusion, the process of fractional distillation is an effective method for separating a mixture of liquids with different boiling points. In this case, the student can separate ethanol from the mixture by using a fractional distillation apparatus and gradually heating the mixture until the ethanol is vaporized and collected in a separate flask.

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We employ a universal indicator that changes colour depending on the concentration of hydrogen ions in a solution. In most cases, the strength of acids and bases is quantified using their pH values. The hydronium ion concentration in the solution is -0.69.

The H⁺ ion concentration's negative logarithm is known as pH. As a result, the meaning of pH is justified as the strength of hydrogen. Acids and bases can be measured using a pH scale. The scale has a range of 0 to 14. An indicator called Litmus paper is used to determine if a chemical is an acid or a basic.

pH = - log [H₃O⁺]

pH = - log[5.0]

pH = -0.69

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The number of sub levels within each energy level of an atom is equal to the value of the principal quantum number. The correct option is (a) principal quantum number.

The principal quantum number, also known as the energy level, determines the overall energy of an electron within an atom.

Each energy level can contain one or more sub-levels, which are identified by the angular momentum quantum number (l). The value of l can range from 0 to n-1, where n is the principal quantum number.

Each sub-level can further be broken down into orbitals, which are identified by the magnetic quantum number (m). The spin quantum number (s) determines the spin of the electron within an orbital.

Therefore, the principal quantum number determines the number of sub-levels within each energy level of an atom.

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The final structure should look like a slightly twisted boat conformation, with the ethyl group pointing down and the methyl group pointing out to the side. This is the lowest energy conformation of cis-1-ethyl-3-methylcyclohexane.

To draw cis-1-ethyl-3-methylcyclohexane in its lowest energy conformation, we first need to identify the cis isomer. This means that the ethyl and methyl groups are on the same side of the ring.

Next, we need to arrange the substituents on the cyclohexane ring in a way that minimizes steric hindrance. We can achieve this by placing the ethyl group in an axial position and the methyl group in an equatorial position.

To visualize this, draw a cyclohexane ring with one carbon atom labeled as the reference carbon. The ethyl group will be attached to the carbon atom in the axial position, which means that it will be pointing up or down. The methyl group will be attached to a carbon atom in the equatorial position, which means that it will be pointing out to the side.

To draw cis-1-ethyl-3-methylcyclohexane in its lowest energy conformation, start with a cyclohexane ring in a chair conformation. Next, place the ethyl group (C2H5) on carbon 1 and the methyl group (CH3) on carbon 3. Ensure both groups are on the same side of the ring (cis configuration). For lowest energy, place the ethyl group in an equatorial position and the methyl group in an axial position. This arrangement minimizes steric hindrance, thus providing the lowest energy conformation for cis-1-ethyl-3-methylcyclohexane.

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Photons of light with shorter wavelengths, such as violet or blue light, possess the greatest amount of energy.

The energy of a photon is directly proportional to its frequency and inversely proportional to its wavelength.

Since frequency and wavelength are inversely related, photons with shorter wavelengths have higher frequencies and therefore more energy.

Therefore, violet or blue light, which have the shortest wavelengths of visible light, possess the greatest amount of energy. Conversely, photons of light with longer wavelengths, such as red or orange light, have less energy.

This relationship between wavelength and energy is important in fields such as optics, spectroscopy, and quantum mechanics.

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Both CS2 and I2 should be more soluble in benzene than in water.

Benzene is a nonpolar solvent, while water is a polar solvent. Nonpolar solutes tend to dissolve in nonpolar solvents, while polar solutes tend to dissolve in polar solvents.

HCl is a polar compound, and C3H8 is a nonpolar compound, but they both contain hydrogen bonding. Hydrogen bonding occurs when H is bonded to an electronegative atom such as N, O, or F.

This bonding leads to the formation of a dipole and polarity in the compound, making it soluble in water, not in benzene. CS2 and I2 are both nonpolar compounds and therefore should be more soluble in benzene than in water.

CS2 is a nonpolar compound with symmetrical bonding and zero dipole moment. It has a linear structure that allows it to have uniform electron density and distribution, making it more soluble in benzene, a nonpolar solvent.

I2 is also nonpolar with a symmetrical structure, and it is less polarizable than other halogens, which means it does not easily form polar bonds. This makes it more soluble in benzene than in water, a polar solvent.

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The phrase "tides of vengeance fly out to meet them" is a metaphorical expression used to describe a situation where strong negative emotions, such as anger or resentment, are being directed towards someone or a group of people.

In this context, the "tides of vengeance" symbolize the intense emotions that are building up and preparing to confront those who have caused the anger or resentment. The term "fly out" emphasizes the swift and potentially overwhelming nature of these emotions, and "to meet them" implies that the emotions are being actively directed towards the offending parties. Overall, the expression conveys a sense of impending confrontation fueled by deep-seated emotions.

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The expected order of Rf values for the compounds benzoic acid, benzoin, and benzil is as follows: benzil > benzoin > benzoic acid.

This ranking is based on the polarity of the compounds and the polarity of the solvent system used in the thin layer chromatography (TLC) experiment. Benzil is the most polar of the three compounds, and it will be attracted to the polar stationary phase on the TLC plate. As a result, it will have the lowest Rf value. Benzoin is less polar than benzil, so it will have a slightly higher Rf value. Finally, benzoic acid is the least polar of the three compounds, and it will be attracted to the nonpolar mobile phase on the TLC plate. As a result, it will have the highest Rf value.

when conducting a TLC experiment with these compounds, the expected order of Rf values is benzil < benzoin < benzoic acid due to the polarity differences between the compounds and the stationary/mobile phases.
The expected order of Rf values for the given compounds is: benzoic acid < benzoin < benzil.


Rf value (Retention factor) is the ratio of the distance traveled by the compound to the distance traveled by the solvent front in chromatography. Compounds with lower polarity usually have higher Rf values because they travel further up the chromatography plate, while polar compounds have lower Rf values since they interact more with the polar stationary phase and travel a shorter distance.

1. Benzoic acid: It is the most polar compound among the three due to the presence of a carboxyl group (-COOH). This group forms strong hydrogen bonds with the polar stationary phase, resulting in a lower Rf value.

2. Benzoin: It has a hydroxyl group (-OH) and a ketone group (>C=O), making it moderately polar. Its Rf value will be higher than benzoic acid but lower than benzil since it can still form hydrogen bonds with the stationary phase, but not as strong as benzoic acid.

3. Benzil: It has two ketone groups (>C=O) and no hydrogen bonding groups, making it the least polar compound among the three. It will have the least interaction with the polar stationary phase and will travel the furthest, resulting in the highest Rf value.

Based on the polarity of the compounds, the order of expected Rf values is benzoic acid (most polar) < benzoin (moderately polar) < benzil (least polar).

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The molarity of the solution is 5.428 M, with 4 significant figures.

To calculate the molarity of a solution, we need to know the amount of solute (in moles) and the volume of the solution (in liters).

Molarity = moles of solute / volume of solution in liters

First, we need to calculate the amount of KCI in moles:

Mass of KCI = 101.00 g

Molar mass of KCI = 39 + 35.5 = 74.5 g/mol

Number of moles of KCI = mass / molar mass = 101.00 g / 74.5 g/mol = 1.357 mol

Next, we need to convert the volume of the solution to liters:

Volume of solution = 250.0 mL = 0.250 L

Finally, we can calculate the molarity:

Molarity = 1.357 mol / 0.250 L = 5.428 M

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The given statement is true that acid-catalysed dehydration of 2,2-dimethylcyclohexanol yields, in part, isopropylidenecyclopentane.
In the acid-catalysed dehydration of 2,2-dimethylcyclohexanol, one of the products formed is isopropylidenecyclopentane. This is because during the reaction, the hydroxyl (-OH) group of the dimethylcyclohexanol molecule is removed, leaving behind a carbocation intermediate.

This intermediate then undergoes a rearrangement to form the isopropylidenecyclopentane product. It is important to note that this is only one of the products that can be formed during this reaction. Other products may include various alkenes, depending on the reaction conditions and the content loaded. Overall, this reaction is an important example of acid-catalysed dehydration, which is a common chemical process used in various industries to produce a wide range of organic compounds.

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When dealing with compressed liquids, we can use values on the left side of the vapor dome, which corresponds to the subcooled liquid region.

However, in order to accurately use these values, we must match the specific property being measured or calculated. This could be any thermodynamic property such as pressure, temperature, specific volume, enthalpy, entropy, or internal energy. Matching the correct property is crucial in ensuring accurate calculations and predictions, as using the wrong property could lead to errors or incorrect assumptions. Therefore, it is important to understand the properties and their relationships in order to effectively use compressed liquids in engineering and scientific applications.

For compressed liquids, also known as subcooled liquids, we can use values on the left side of the vapor dome. To obtain accurate data, we must match the specific property of temperature and pressure. Matching these properties ensures that we correctly characterize the liquid's thermodynamic state, which is essential for various engineering calculations and processes. Remember to always consult a reliable source, such as steam tables or software, to obtain accurate property data for compressed liquids.

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The strong base KOC(CH​​​​​₃)₃ 2 equivalents in DMSO and Cl₂  reagents are needed to prepare CH₃CH₂CH₂CH₂C=CH.

Option G and J are correct.

Alkenes on expansion with chlorine goes through expansion response and structures vicinal dihalide and afterward the vicinal dihalide on treating serious areas of strength for with like sodamide or potassium ter-butoxide gives the alkyne by evacuation of HX in the meantime in the response in the event that the base focus is high, it can likewise digest the terminal alkyne proton additionally and structures alkynyl anion at long last on workup we will get our necessary alkyne.

We will employ Cl₂ from the aforementioned reagents.

A hydrocarbon with one or more double covalent carbon-carbon bonds is an alkene. A hydrocarbon with one or more triple covalent carbon-carbon bonds is an alkyne.

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The different classes of material symmetry are rotational, reflection and translation symmtry etc. Isotropic materials have the uniform properties in all direction and when a plane cut into two equal halves through a chemical species is plane of symmetry.

The variation of material properties with respect to direction at a fixed point in a material is called material symmetry. Types of symmetries are rotational symmetry, reflection symmetry, translation symmetry, and glide reflection symmetry.

Hence, plane of symmetry is one of symmetry in materials.

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If voltage-gated Na ion channels needed greater hyperpolarization than normal to deinactivate, it would result in delayed action potentials and slower nerve impulses.

Voltage-gated Na ion channels are responsible for the depolarization phase of the action potential. They open in response to depolarization, allowing an influx of Na ions into the cell. After a brief period, these channels deinactivate, preventing further influx of Na ions. If these channels required greater hyperpolarization than normal to deinactivate, it would result in delayed action potentials and slower nerve impulses.

This is because the cell membrane would need to become more negative than usual to close the Na channels, slowing down the depolarization and repolarization phases of the action potential. Ultimately, this could lead to neurological disorders such as epilepsy or paralysis. However, the exact consequences would depend on the specific context and severity of the dysfunction.

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Thymol blue is an acid-base indicator commonly used in chemistry experiments. It has two color transitions depending on the pH of the solution. Below pH 2.0, the indicator appears red, between pH 2.0 and 8.0 it appears yellow, and above pH 8.0 it appears blue.

The two color transitions occur at pH 2.0 and pH 8.0, respectively. The first color transition from red to yellow occurs as the solution becomes more basic, meaning there is an increase in hydroxide ion concentration and a decrease in hydrogen ion concentration. The second transition from yellow to blue occurs as the solution becomes even more basic, and the concentration of hydroxide ions increases even further. The color changes occur due to the structural changes in the indicator molecule as it reacts with hydrogen ions or hydroxide ions. This makes thymol blue a useful indicator for acid-base titrations and other experiments where the pH of a solution needs to be determined.

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At low pH, the amino acid zwitterion has a net positive charge due to the presence of excess hydronium ions (H3O+).

This leads to an acid-base reaction between the zwitterion and the hydronium ions. The hydronium ions act as the acid, donating a proton to the amino acid zwitterion, which acts as the base. This results in the formation of a conjugate acid of the amino acid zwitterion, with a net positive charge and the hydronium ion losing a proton to become water (H2O).

Therefore, the product of this acid-base reaction is a positively charged conjugate acid of the amino acid zwitterion and water.

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The density of air at 0.97 atm and 30.0°C is 1.13 g/L. This can be determined using the ideal gas law, which relates the pressure, volume, temperature, and molar mass of a gas. By rearranging the ideal gas law equation, we can solve for density and substitute the given values to find the answer.

The ideal gas law states that PV = nRT, where P represents pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin. Rearranging the equation, we have n/V = P/RT, which can be rewritten as density (ρ) = molar mass (M) × (P/RT), where ρ = n/V represents the density of the gas. To find the density of air, we need to substitute the given values. The molar mass of air is approximately 29.0 g/mol. The pressure is 0.97 atm, which can be converted to Pascal (Pa) or other appropriate units. The temperature is given as 30.0°C, which needs to be converted to Kelvin by adding 273.15. The gas constant R is a constant value. By plugging these values into the density equation, we can calculate the density of air at the given conditions. The result is 1.13 g/L. In conclusion, the density of air at 0.97 atm and 30.0°C is 1.13 g/L, as determined using the ideal gas law and substituting the given values into the density equation.

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Answer:

23%

Explanation:

the reason is because it rose one degree. during the wait of the 40.seconds I had to wait to re post my new found hypothesis

The least effective combination of reagents in generating sodium ethoxide is using NaOH instead of Na as the reducing agent. NaOH is a weaker reducing agent, leading to a slower reaction and a lower yield of sodium ethoxide.

In order to generate sodium ethoxide, we need to combine ethanol with sodium metal. However, not all combinations of reagents are equally effective in generating sodium ethoxide.
One combination of reagents that is least effective in generating sodium ethoxide is using sodium hydroxide (NaOH) instead of sodium metal (Na). Sodium hydroxide is a weaker reducing agent compared to sodium metal, meaning it is less effective in donating electrons to ethanol to form the sodium ethoxide. Additionally, the reaction between NaOH and ethanol is slower compared to that of Na and ethanol. This means that even if we use excess NaOH, the reaction will not proceed to completion, resulting in a lower yield of sodium ethoxide.
In summary, the least effective combination of reagents in generating sodium ethoxide is using NaOH instead of Na as the reducing agent. NaOH is a weaker reducing agent, leading to a slower reaction and a lower yield of sodium ethoxide.

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Essentially all the hydrogen nuclei that will ever exist in our universe were created during the first few minutes after the Big Bang, a period known as primordial nucleosynthesis. This process occurred when the universe was extremely hot and dense, allowing for the formation of hydrogen nuclei through a series of nuclear reactions.

During the early stages of the universe, the temperature and density were incredibly high. About three minutes after the Big Bang, the conditions became favorable for primordial nucleosynthesis, the synthesis of light atomic nuclei. At this time, the universe had cooled down enough for protons and neutrons to combine and form the simplest atomic nucleus, which is hydrogen. As the universe expanded and cooled further, other light elements like helium and trace amounts of lithium were also formed. The process of primordial nucleosynthesis involved a delicate balance between the expansion rate of the universe and the rate of nuclear reactions. If the expansion was too rapid, the nuclei would not have enough time to collide and form heavier elements. On the other hand, if the expansion was too slow, the universe would become too hot, preventing the formation of stable atomic nuclei. Fortunately, during those few minutes after the Big Bang, the conditions were just right for the creation of hydrogen nuclei. Since primordial nucleosynthesis, the universe has continued to evolve and expand. Stars and galaxies formed, leading to the synthesis of heavier elements through stellar nucleosynthesis and supernova explosions. However, the abundance of hydrogen nuclei remained relatively constant, as they were already formed in abundance during the early universe. Thus, all the hydrogen nuclei that will ever exist were created during the first few minutes after the Big Bang, marking the genesis of one of the most abundant elements in the universe.

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Answer:

Atomic radii tend to decrease from left to right across a period and increase from top to bottom within a group.

This is because as you move from left to right across a period, the number of protons in the nucleus increases, but the number of electron shells remains the same. This means that the electrons are pulled closer to the nucleus, and the atomic radius decreases. As you move from top to bottom within a group, the number of electron shells increases, while the number of protons in the nucleus remains the same. This means that the electrons are further away from the nucleus, and the atomic radius increases.

Explanation:

It would take approximately 2 seconds to deposit 1.00 x 10 g of chromium. To determine the time it would take to deposit 1.00 x 10 g of chromium, we need to use Faraday's Law of Electrolysis, which states that the amount of substance deposited at an electrode is directly proportional to the amount of electricity passed through the electrolyte.

First, we need to calculate the number of moles of chromium that need to be deposited using its molar mass.

1.00 x 10 g of chromium is equivalent to 1.00 x 10/51.996 g/mol = 1.923 x 10^-4 moles of chromium.

Next, we can use Faraday's constant, which is 96,485 C/mol e-, to calculate the amount of charge needed to deposit 1.923 x 10^-4 moles of chromium.

Q = nF = (1.923 x 10^-4)(96,485) = 18.56 C

Finally, we can use the current and charge to calculate the time needed using the equation t = Q/I.

t = 18.56/10.0 = 1.856 seconds or approximately 2 seconds. Therefore, it would take approximately 2 seconds to deposit 1.00 x 10 g of chromium.

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The balanced equation for the reaction is 2Al + 3H3PO4 → Al2(HPO4)3 + 3H2. To determine which reactant limits the reaction, we need to calculate the number of moles of each reactant.

The moles of phosphoric acid are 1.82 g / 98 g/mol = 0.0186 mol, and the moles of aluminum are 0.659 g / 27 g/mol = 0.0244 mol. The stoichiometry of the balanced equation shows that 3 moles of phosphoric acid react with 2 moles of aluminum, so aluminum is the limiting reactant. Phosphoric acid is in excess, and we can calculate the amount of excess by subtracting the amount of aluminum used from the initial amount: 1.82 g - (0.659 g / 27 g/mol * 2) = 1.33 g. Therefore, 1.33 g of phosphoric acid are left over.

a. Balanced equation: 2 Al + 6 H3PO4 → 2 Al(PO4)3 + 3 H2

b. Limiting reactant: Aluminum (Al)

c. Excess reactant: Phosphoric acid (H3PO4)

d. Excess reactant left over: 1.34 g of H3PO4

In this reaction, aluminum and phosphoric acid react to produce aluminum phosphate and hydrogen gas. The limiting reactant is determined by comparing the amount of each reactant present, in this case, 1.82 g of H3PO4 and 0.659 g of Al. Aluminum is the limiting reactant, meaning it will be completely consumed during the reaction, while phosphoric acid is in excess. After the reaction, 1.34 g of phosphoric acid will be left over.

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After the reduction of the ketone using borohydride, you need to add an acidic solution such as water/HCl to destroy the excess borohydride.

This is because borohydride is a strong reducing agent and can react with other functional groups in the reaction mixture. The acidic solution protonates the borohydride ion, forming hydrogen gas and borate ions, which are soluble and can be easily removed from the reaction mixture.

Adding other reagents such as hexanes, phenoxide ion, ethanol or acetic anhydride would not effectively destroy the excess borohydride and could lead to unwanted side reactions.  

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