Calculate moles of al2(so4)3 produced if you have 8.5 moles h2so4 that are available to react. ​

The average atomic mass of element J is 79.854u as it determines the properties and behavior of the element in various chemical and physical processes.

To calculate the average atomic mass of element J, we need to use the formula:

Average atomic mass = (mass₁ × % abundance₁ + mass₂ x % abundance₂) ÷ 100

where mass₁ and mass₂ are the atomic masses of the two isotopes and % abundance₁ and % abundance₂ are their respective relative abundances.

Substituting the values given in the problem, we get:

Average atomic mass of J = (78.92u x 50.69% + 80.92u x 49.31%) ÷ 100

= (40.05148u + 39.80252u) ÷ 100

= 79.854u

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The product of the reaction between methyl propanoate and CH3MgBr, followed by H3O+ is an alcohol, specifically, 2-methyl-2-propanol.

Methyl propanoate is an ester compound made up of three carbon atoms and eight hydrogen atoms. It is a colorless liquid with a slightly sweet odor. Methyl propanoate is produced through the reaction of an alcohol and an acid. The acid used is propionic acid and the alcohol is methanol. The reaction is a condensation reaction, meaning two molecules combine to form one larger molecule with a water molecule as a by-product. Methyl propanoate is used as a solvent and a flavoring agent in foods and beverages.

This is derived from the acyl portion of the methyl propanoate, which is a carboxylic acid. The reaction proceeds via a nucleophilic acyl substitution mechanism, where the CH3MgBr acts as a nucleophile, displacing the OH group from the carboxylic acid, forming a carboxylate ion. This is then protonated by the H3O+, forming the desired alcohol product. The product is represented in the following structure:

O

|

CH3-C-OH  =>  CH3-C-O-MgBr  =>  CH3-C-OH + H3O+

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To recover the benzoic acid, collect the bottom layer, dry it with [tex]Na_{2} SO_{4}[/tex], filter to remove [tex]Na_{2} SO_{4}[/tex], and evaporate the solvent. The option 4  is correct.

This is because benzoic acid is a carboxylic acid and will react with the basic aqueous solution to form a water-soluble carboxylate salt. As a result, benzoic acid will be in the aqueous layer, which is the bottom layer. Ethyl acetate is the organic solvent and will form the top layer. By collecting the bottom aqueous layer, we can isolate the benzoic acid. Drying the solution with [tex]Na_{2} SO_{4}[/tex] removes any remaining water, and evaporating the solvent leaves behind the solid benzoic acid. Option 4 is correct answer.

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--The complete Question is, you are separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. how would you recover the benzoic acid? group of answer choices

1.  collect the top layer, dry with na2so4,

2. filter to remove the na2so4, and evaporate the solvent.

3. collect the bottom layer, dry with na2so4,

4.  collect the bottom layer and add hcl to precipitate the compound.

5. collect the top layer and add hcl to precitipate the compound.  --

The mass of the ionic compound dissolved in 100 g of water is 7.44 grams.

To solve this problem, we need to use the formula:

m = n x M x MW

where m is the mass of the compound in grams, n is the number of moles of the compound, M is the molarity of the solution, and MW is the molar mass of the compound.

First, we need to calculate the number of moles of the compound dissolved in 100 g of water:

density of solution = mass of solution / volume of solution

volume of solution = mass of solution / density of solution = 100 g / 1.094 g/mL = 91.29 mL = 0.09129 L

moles of compound = M x volume of solution = 0.531 mol/L x 0.09129 L = 0.0485 mol

Now, we can calculate the mass of the compound:

m = n x M x MW = 0.0485 mol x 153.5 g/mol = 7.44 g

Therefore, the mass of the ionic compound dissolved in 100 g of water is 7.44 grams.

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The standard free energy change (∆G°) for the given reaction at 298K is -474.26 kJ/mol.

The given reaction is: [tex]2H_2(g) + O_2(g) - > 2H_2O(g)[/tex]

The standard free energy change (∆G°) for the given reaction can be calculated using the equation:

∆G° = Σ∆G°f(products) - Σ∆G°f(reactants)

Where ∆G°f is the standard free energy of formation for each compound in the reaction at standard conditions (298K and 1 atm pressure).

Using the standard free energy of formation values from tables, we get:

∆G° = 2(-237.13 kJ/mol) - [2(0 kJ/mol) + 1(0 kJ/mol)]

∆G° = -474.26 kJ/mol

The negative value indicates that the reaction is exergonic and spontaneous under standard conditions.

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--The complete Question is, What is the standard free energy change, ∆G°, in kJ, for the following reaction at 298K?

2H2(g) + O2(g) -> 2H2O(g) --

(A) Helium gas would effuse faster than nitrogen gas. (B) The rate of effusion of helium to nitrogen gas is approximately 4:1. (C) It would take helium gas approximately 5.5 seconds to effuse.

Part (A): The rate of effusion is directly proportional to the velocity of the gas particles, which is inversely proportional to the square root of their masses.

Helium gas has a smaller molar mass (4 g/mol) than nitrogen gas (28 g/mol), which means its particles have a higher velocity and would effuse faster.

Part (B): According to Graham's law of effusion, the rate of effusion of two gases is inversely proportional to the square root of their molar masses.

Therefore, the rate of effusion of helium to nitrogen gas can be calculated as the square root of the ratio of their molar masses, which is approximately 4:1.

Part (C): Using Graham's law of effusion again, we can set up a proportion to find the time it would take helium gas to effuse if nitrogen gas takes 22 seconds.

The ratio of the square roots of their molar masses is 1:√7, so the proportion is:

√(4/28) : √(1/√7) = 22 : x

Solving for x, we get approximately 5.5 seconds.

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The maximum amount of iron (II) oxide that can be formed is 176.9 g if 23.1 g of iron reacts with 53.22 g of oxygen to produce iron (ii) oxide.

The balanced chemical equation for the reaction between iron and oxygen to produce iron (II) oxide is:

4Fe + 3O₂ → 2Fe₂O₃

From the equation, we can see that 4 moles of iron react with 3 moles of oxygen to produce 2 moles of iron (II) oxide.

Calculate the number of moles of each reactant using their respective molar masses:

Number of moles of iron = 23.1 g ÷ 55.845 g/mol

= 0.414 moles

Number of moles of oxygen = 53.22 g ÷ 32 g/mol

= 1.663 moles

Since the stoichiometric ratio of iron to oxygen is 4:3, we can see that oxygen is the limiting reactant because there are only 3 moles of oxygen available for every 4 moles of iron required.

Number of moles of Fe₂O₃ = 2 ÷ 3 × 1.663

= 1.108 moles

Mass of Fe₂O₃ = 1.108 moles × 159.69 g/mol

= 176.9 g

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The scenario described in the question is an example of the negative impact that can result from introducing exotic organisms into an ecosystem.

Exotic organisms, also known as invasive species, are non-native species that are introduced to an ecosystem and can outcompete native species, disrupt natural ecological processes, and cause harm to the environment and economy.

When the exotic organisms are released into the local environment, they have no natural predators, and their population can increase unchecked, causing a decrease in biodiversity.

This is because the invasive species may outcompete and displace native species, reduce the availability of resources, and alter the habitat. The result is a homogenization of the ecosystem, where there are fewer different types of species and less overall diversity.

In summary, introducing exotic organisms can have a negative impact on biodiversity in an ecosystem, which can have cascading effects on the health and stability of the ecosystem. It is important to carefully manage and monitor the introduction of exotic organisms to prevent these negative impacts.

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Fragments of weathered rocks can be moved by wind, air, or water.

Weathering is a natural process that breaks down rocks and minerals into smaller pieces. When a rock is weathered, it may physically or chemically change due to exposure to elements such as water, wind, ice, and temperature changes.

Physical weathering refers to the breakdown of rock through mechanical processes, such as abrasion, pressure changes, and freeze-thaw cycles.

Chemical weathering involves the breakdown of rock through chemical reactions, such as oxidation, hydrolysis, and dissolution.

In both cases, the resulting smaller pieces of rock or mineral fragments may be moved by wind, air, or water, and may be transported to new locations.

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An unmanned spacecraft is a type of spacecraft that is designed and programmed to operate without human crew on board.

These spacecraft are sent from Earth to explore various objects in space, such as planets, moons, asteroids, comets, and other celestial bodies. They are used to gather scientific data, images, and other important information that can help us learn more about the universe.

The unmanned spacecraft is equipped with a variety of instruments and sensors that allow it to study the object it is exploring. These instruments can include cameras, spectrometers, radar systems, and other scientific instruments. The spacecraft is controlled remotely from Earth, and the data it collects is transmitted back to Earth for analysis.

One of the main advantages of using unmanned spacecraft is that they can operate in environments that are too dangerous or inhospitable for humans. For example, unmanned spacecraft can explore the harsh and extreme environments of other planets or moons, where humans cannot survive.

Additionally, unmanned spacecraft are often less expensive to launch and operate than crewed missions, making them a more cost-effective option for space exploration.

In summary, unmanned spacecraft are an essential tool for exploring the vast expanse of space. They allow us to gather important data and information about our universe, and they are a key component of modern space exploration.

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The correct set of modifications to the given chemical equations is to multiply the second equation by 2 and reverse it, option D is correct.

To obtain the final chemical equation, we need to cancel out the reactants that appear as intermediates in the two given chemical equations. In this case, we need to cancel out H₂ and F₂. The second equation shows that one H₂ molecule reacts with one F₂ molecule to produce two HF molecules. Therefore, we need two molecules of the second equation, which can be achieved by multiplying it by 2.

However, the second equation has to be reversed before multiplying it by 2. This is because, in the final chemical equation, we need to form HF and O₂ from H₂O and F₂, whereas the given second equation shows the formation of HF from H₂ and F₂, option D is correct.

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The complete question is:

Consider the following intermediate chemical equations.

2H₂(g) + O₂(g) → 2H₂O(l)

H₂(g) + F₂(g) → 2HF(g)

In the final chemical equation, HF and O₂ are the products that are formed through the reaction between H₂O and F₂. Before you can add these intermediate chemical equations, you need to alter them by multiplying the:

A) second equation by 2 and reversing the first equation.

B) first equation by 2 and reversing it.

C) first equation by (1/2) and reversing the second equation.

D) second equation by 2 and reversing it.

An ecosystem is an interconnected set of living and non-living components that interact and influence each other to form a functional unit.

Here all options are correct

As such, it is a complex system of energy and material exchanges between its components. A list of components that make up an ecosystem can include soil, air, sunlight, rocks, rain, and different populations of living organisms. The living components of an ecosystem include plants, animals, and microorganisms, such as worms and jackals. These organisms interact and depend on each other for survival, such as the leopards, giraffes, antelope, and hyenas that rely on the grass and other plants that are watered by the rain.

The sunlight provides energy for photosynthesis, which is essential for the production of food and oxygen. The rocks, soil, and air in the environment provide the physical structure that allows different organisms to interact and thrive. All of these components contribute to the health of an ecosystem, and each component plays an important role in maintaining the balance of the ecosystem.

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Sample A or Sample B cannot be definitively determined as more alkaline based on the given information.  The equation for sodium carbonate dissolving in water shows that it produces both sodium ions (Na⁺) and hydroxide ions (OH⁻), which are the ions responsible for making a solution alkaline.

However, the fact that not all of the sodium carbonate dissociates into ions means that the concentration of alkaline ions in the solution will be less than the total concentration of sodium carbonate added. Therefore, the alkalinity of a sample cannot be determined solely based on the amount of sodium carbonate present.

Other factors, such as the presence of other alkaline substances or the pH of the solution, would need to be considered to determine which sample is more alkaline.

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According to the balanced chemical equation, 1 mole of SiC is produced from 1 mole of C. Therefore, the number of moles of SiC produced from 9.3 moles of C is also 9.3 moles.

The balanced chemical equation for the reaction between SiO₂ and C to produce SiC and CO is:

SiO₂ + C ⇒ SiC + CO

The stoichiometric coefficients of C and SiC are both 1. This means that for every 1 mole of C reacted, 1 mole of SiC is produced. Therefore, if we have 9.3 moles of C, we can expect to produce 9.3 moles of SiC.

It is important to note that the balanced chemical equation assumes that the reaction goes to completion, meaning that all of the reactants are consumed and converted into products. In reality, some of the reactants may not be fully consumed, leading to a lower yield of the desired product.

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When we place a metal spoon and a wooden spoon of equal masses/size in a boiling pot of water for the same amount of time, the metal spoon would likely be more painful to grab than the wooden spoon. This is because of the differences in their specific heat capacities.

Specific heat capacity is the amount of heat required to raise the temperature of a substance by 1 degree Celsius per unit mass. Metals have a lower specific heat capacity than wood, which means that they require less heat to increase their temperature than wood does.

As a result, the metal spoon would heat up more quickly than the wooden spoon in the boiling water.

Heat flow is the transfer of thermal energy from one object to another due to a temperature difference between them. In this case, heat flows from the boiling water to the spoons. The metal spoon would conduct heat better than the wooden spoon due to its higher thermal conductivity.

This means that the metal spoon would transfer heat more quickly from the boiling water to your hand, making it more painful to grab.

Mass is also a factor to consider as it affects the amount of heat absorbed by the spoons. However, since the spoons have equal masses, mass does not play a significant role in this scenario.

In summary, the metal spoon would likely be more painful to grab because it has a lower specific heat capacity and higher thermal conductivity than the wooden spoon, which causes it to heat up more quickly and transfer heat more efficiently from the boiling water to your hand.

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Yes, silver would still be considered an ore even if its demand and usage in digital technology, gold jewelry, and paper money decreased to the point of non-existence. Silver is a naturally occurring metallic element that is found in various ores, and its classification as an ore is based on its physical and chemical properties, regardless of its market demand. Therefore, even if the uses of silver in various industries decline, it would still be classified as an ore.

An ore is a naturally occurring mineral or rock containing valuable substances, typically metals, that can be extracted through mining and processed for various purposes. Even if the demand for silver decreases due to digital technology, gold jewelry, and paper money, it would not change the fact that silver is a naturally occurring material containing a valuable metal. The classification of silver as an ore is independent of its current or potential use in human activities.

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One simple experiment that can be conducted to demonstrate that living materials contain water is heating of simple matter.

The following experimental procedure deminstrates the presence of water on living matter.

If the sample contains water, the final weight will be less than the initial weight, indicating that some of the water has been lost due to the heating process.

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When 8.00 g of lithium reacts with [tex]AlCl_{3}[/tex], 10.39 g of aluminum is produced.

The molar mass of lithium (Li)= 6.94 g/mol

Moles of Li = mass of Li / molar mass of Li= 8.00 g / 6.94 g/mol = 1.154 moles

Now, 3 moles of Li produce 1 mole of Al
moles of Al produced = 1.154 moles / 3 = 0.385 moles

The molar mass of aluminum (Al)= 26.98 g/mol

Mass of Al = moles of Al × molar mass of Al= 0.385 moles × 26.98 g/mol = 10.39 g

So, when 8.00 g of lithium reacts with [tex]AlCl_{3}[/tex], 10.39 g of aluminum is produced.

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Magnesium loses two electrons to oxygen to form Mg²⁺ and O²⁻ ions. The ionic formula for this compound can be predicted by writing the formula unit that balances the charges of the two ions. The ionic formula for magnesium oxide is MgO.

The Lewis dot structure of magnesium is Mg with two dots representing its valence electrons. The Lewis dot structure of oxygen is O with six dots representing its valence electrons.

Magnesium and oxygen form an ionic compound because magnesium loses two electrons to oxygen to form Mg²⁺ and O²⁻ ions. The ionic formula for this compound can be predicted by writing the formula unit that balances the charges of the two ions.

Since Mg²⁺ has a 2+ charge and O²⁻ has a 2- charge, the ionic formula for magnesium oxide is MgO.

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The atomic mass of aluminum (Al) is approximately 26.98 amu. Therefore, the mass of one Al atom is 26.98 amu.

To calculate the mass of 75 Al atoms, we can multiply the mass of one Al atom by 75:

Mass of 75 Al atoms = 75 atoms x 26.98 amu/atom

Mass of 75 Al atoms = 2024.5 amu

Therefore, the mass of 75 Al atoms is 2024.5 amu.

Red tape can be used to repair a broken taillight on a car. Different colors of light are transmitted through the tape, while the color red is reflected back and absorbed by the tape, allowing it to emit a red light.

This is due to the tape's properties and the way it interacts with the light spectrum. In general, light is transmitted through transparent or translucent materials, while opaque materials absorb and reflect light.

The color of an object is determined by the wavelengths of light that are absorbed and reflected by its surface. So, in the case of the red tape, it absorbs all colors of light except for red, which it reflects back, allowing the tape to emit a red light when placed over a broken taillight.

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First, we need to use stoichiometry to find out how many moles of hydrogen gas are produced. From the balanced chemical equation, we can see that for every 1 mole of zinc (Zn), 1 mole of hydrogen gas (H2) is produced. Therefore, if we have 20.0 mol of Zn, we will also produce 20.0 mol of H2.

Next, we can use the formula for the mass of a gas:

mass = molar mass x number of moles

The molar mass of hydrogen gas is approximately 2.02 g/mol. Therefore, the mass of 20.0 mol of hydrogen gas would be:

mass = 2.02 g/mol x 20.0 mol
mass = 40.4 g

So, 40.4 grams of hydrogen gas are produced when 20.0 mol of Zn are added to excess hydrochloric acid.

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potassium + chlorine → potassium chloride

hydrogen + iodine → hydrogen iodide

A synthesis reaction is a type of chemical reaction in which two or more simple substances combine to form a more complex product. In a synthesis reaction, the reactants come together to create a single compound, usually with the release of energy in the form of heat or light. The general equation for a synthesis reaction is A + B → AB, where A and B are the reactants, and AB is the product.

Synthesis reactions are also known as combination reactions because they involve the combination of two or more substances to form a new compound.

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After three half-lives have passed, 2.50 g of the radioisotope would remain out of the initial 20.0 g.

If a radioisotope has a half-life of t, then the amount of the radioisotope that remains after n half-lives can be calculated using the formula:

[tex]N = N0 * (1/2)^n[/tex]

where N0 is the initial amount of the radioisotope.

If three half-lives have passed, then n = 3. Using the given initial amount of 20.0 g, we can calculate the amount that remains after three half-lives as follows:

[tex]N = N0 * (1/2)^n\\N = 20.0 g * (1/2)^3[/tex]

N = 20.0 g * (1/8)

N = 2.50 g

Therefore, after three half-lives have passed, 2.50 g of the radioisotope would remain out of the initial 20.0 g.

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A total of 0.0103 moles of barium phosphate will react with 1.60 g of aluminum hydroxide.

The balanced chemical equation for the reaction between barium phosphate and aluminum hydroxide is:

Ba₃(PO₄)₂ + 2 Al(OH)₃ → 2 AlPO₄ + 3 Ba(OH)₂

To calculate the moles of barium phosphate that will react with 1.60 g of aluminum hydroxide, we need to convert the given mass of aluminum hydroxide into moles using its molar mass:

Molar mass of Al(OH)₃ = 78 g/mol

Number of moles of Al(OH)₃ = 1.60 g / 78 g/mol = 0.0205 mol

According to the balanced chemical equation, 2 moles of Al(OH)3 react with 1 mole of Ba3(PO4)2. Therefore, the number of moles of Ba₃(PO₄)₂ required can be calculated as:

Number of moles of Ba₃(PO₄)₂ = (0.0205 mol Al(OH)₃) / 2 = 0.0103 mol

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When water boils, the bubbles are composed of water vapor or steam.

The bubbles form when the water is heated to its boiling point and the water molecules gain enough thermal energy to overcome the intermolecular forces holding them together in the liquid state.

As the water molecules escape into the gaseous state, they form bubbles that rise to the surface of the liquid and release the steam into the atmosphere.

The bubbles are filled with water vapor, which is less dense than liquid water and has a higher thermal energy due to the increased molecular motion in the gas phase. Once the bubbles reach the surface, they burst and release the steam into the air.

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To solve this problem, we need to use the principle of conservation of mass, which states that mass cannot be created or destroyed, only transferred or transformed. First, we need to find the initial mass of the marshmallow and food holder, which is 5.08 g. Then, after burning the marshmallow, the new mass of the marshmallow and food holder is 5.00 g.

To determine the mass of food burned, we need to subtract the new mass from the initial mass:
5.08 g - 5.00 g = 0.08 g
Therefore, the mass of food burned is 0.08 g.

It's important to note that we cannot determine the mass of the marshmallow that was burned specifically, as we do not have that information. However, we can determine the total mass of food burned.

In general, it's important to be aware of the principle of conservation of mass in all types of chemical reactions and food preparation. While we may not always measure or track the exact amounts of ingredients we use, understanding how mass is conserved can help us better understand and control the outcomes of our cooking and baking.

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The mechanism for the E1 elimination reaction of 2-methylcyclohexanol with phosphoric acid is Protonation of the alcohol group by phosphoric acid.

Protonation is the process of adding a proton (hydrogen ion) to a molecule or atom. The process is also known as hydrogenation or hydrideation. It occurs when a molecule or atom gains a proton, which imparts a positive charge on the molecule or atom.

The mechanism for the E1 elimination reaction of 2-methylcyclohexanol with phosphoric acid is as follows:

Step 1: Protonation of the alcohol group by phosphoric acid.

Phosphoric acid (H₃PO₄) donates a proton to the OH group of 2-methylcyclohexanol, forming an oxonium ion (H₃O⁺). Electron flow is shown in the following diagram:

[tex]O-H + H_3PO4 \rightarrow H_3O^+ + PO_4^3-[/tex]

Step 2: Deprotonation by a base.

The oxonium ion (H3O+) is then deprotonated by a base (e.g. a strong base such as NaOH). Electron flow is shown in the following diagram:

[tex]H_3O^+ + B^- \rightarrow H_2O + BH^+[/tex]

Step 3: Rearrangement of the molecule.

The deprotonated molecule rearranges to form a more stable carbocation intermediate. Electron flow is shown in the following diagram:

[tex]BH^+ \rightarrow B^+ + H^-[/tex]

Step 4: Nucleophilic attack by the alcohol group.

The carbocation intermediate is attacked by the OH group of 2-methylcyclohexanol, forming a new carbon-oxygen bond. Electron flow is shown in the following diagram:

[tex]C^+ + OH- \rightarrow C-O + H^+[/tex]

Step 5: Loss of a proton.

The molecule then loses a proton, forming the product of the reaction. Electron flow is shown in the following diagram:

[tex]C-O + H^+ \rightarrow C=O + H_2O[/tex]

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The answer to the part A, B, C, D and E are as follows-

Part A: [tex][H3O+] [OH−] pOH[/tex] pH Acidic or Basic

1.0×10−8 1.0×10−6 6.00 8.00 basic

1.0×10−5 1.0×10−9 9.00 5.00 acidic

9.7×10−9 1.0×10−5 5.00 8.99 basic

[tex]1.0×10−14 1.0×10^14 14.00 0.00 neutral\\1.0×10^−3 1.04×10^−11 11.98 2.00 acidic[/tex]

Part B:

[tex][H3O+] [OH−] pOH[/tex] pH Acidic or Basic

1.0×10−8 1.0×10−6 6.00 8.00 basic

1.0×10−5 1.0×10−9 9.00 5.00 acidic

9.7×10−9 1.0×10−5 5.00 8.99 basic

[tex]1.0×10−14 1.0×10^14 14.00 0.00 neutral\\1.0×10^−3 1.04×10^−11 11.98 2.00 acidic[/tex]

Part C:

[tex][H3O+] [OH−] pOH[/tex]pH Acidic or Basic

1.0×10−8 1.0×10−6 6.00 8.00 basic

1.0×10−5 1.0×10−9 9.00 5.00 acidic

9.7×10−9 1.0×10−5 5.00 8.99 basic

[tex]1.0×10−14 1.0×10^14 14.00 0.00 neutral\\1.0×10^−3 1.04×10^−11 11.98 2.00 acidic[/tex]

Part D:

[tex][H3O+] [OH−] pOH[/tex]pH Acidic or Basic

1.0×10−8 1.0×10−6 6.00 8.00 basic

1.0×10−5 1.0×10−9 9.00 5.00 acidic

9.7×10−9 1.0×10−5 5.00 8.99 basic

[tex]1.0×10−14 1.0×10^14 14.00 0.00 neutral\\1.0×10^−3 1.04×10^−11 11.98 2.00 acidic[/tex]

Part E:

[tex][H3O+] [OH−] pOH[/tex]pH Acidic or Basic

1.0×10−8 1.0×10−6 6.00 8.00 basic

1.0×10−5 1.0×10−9 9.00 5.00 acidic

9.7×10−9 1.0×10−5 5.00 8.99 basic

[tex]1.0×10−14 1.0×10^14 14.00 0.00 neutral\\1.0×10^−3 1.04×10^−11 11.98 2.00 acidic[/tex]

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Answer:

because they are poorly made

Explanation: