calculate the concentration of dpip if the absorbance value was 0.426. the molar extinction coefficient value is 21.3/(mm cm) .

Answer:

2020 from da 230 get it right fam

Explanation:

8 moles of oxygen are required to completely oxidize 1.67*10-3 m glucose solution (C6H12O6) completely to CO2 and H2O.

In order to completely oxidize 1.67*10-3 m glucose solution (C6H12O6) completely to CO2 and H2O, 8 moles of oxygen are required.

The balanced equation of the reaction, which is: C6H12O6 + 6O2 ---> 6CO2 + 6H2O.

As there are 6 moles of oxygen molecules on the reactant side, 8 moles of oxygen molecules are needed to completely oxidize 1.67*10-3 m of glucose solution.

This can also be calculated by the equation n=N/V, where n is the molarity of the solution, N is the number of moles of solute and V is the volume of the solution.

Therefore, 8 moles of oxygen is equal to the molarity of the glucose solution multiplied by the volume.

The reaction between oxygen and glucose to form CO2 and H2O is an oxidation reaction. In oxidation reactions, the reactant molecules are oxidized, and as a result, oxygen is reduced.

Therefore, oxygen is needed for the oxidation of glucose molecules to occur. In other words, without the presence of oxygen, the oxidation of glucose to CO2 and H2O cannot occur.

In conclusion, 8 moles of oxygen are required to completely oxidize 1.67*10-3 m glucose solution (C6H12O6) completely to CO2 and H2O.

This can be calculated by the balanced equation of the reaction or by the equation n=N/V. This is an oxidation reaction, meaning oxygen is necessary for the oxidation of glucose molecules to occur.

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The Grignard reaction must be kept dry because water will react with the Grignard reagent and terminate the reaction.

Glassware must be dried in an oven prior to the experiment because even small amounts of water can react with the Grignard reagent and terminate the reaction.


In order to ensure the reaction takes place, it is essential to remove all traces of water. This can be accomplished by drying the glassware in an oven. Drying the glassware helps to eliminate any water molecules that may be present on the surface of the glass.

Additionally, the reaction must be kept dry in order to prevent any water molecules in the air from reacting with the Grignard reagent. If water molecules were to come into contact with the Grignard reagent, it would react with the reagent and terminate the reaction.

As a result, keeping the reaction dry and using oven-dried glassware are essential steps in performing a successful Grignard reaction.

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Answer:

alpha: atomic mass = 4

beta: mass of electron; positive charge

gamma: 100 percent energy; zero mass

positron: mass <1; unstable charge (+)

beta: electron emitted from the nucleus

Note: Mesons are particles composed of a quark and an antiquark and do not fit the descriptions provided.

To perform an experiment to determine the cause of the resting potential by adjusting the ionic concentrations, you will need to complete the following steps.

First, you should set up the appropriate apparatus for the experiment. This will include a solution chamber, an electrode, a reference electrode, and a recording device.

Second, you should prepare the solutions in the chamber, adjusting the concentrations of the various ions. You may want to begin with a balanced solution, then adjust one of the ions while keeping the others constant.

Third, you should measure the resting potential of the cell. Record the values of the resting potential as you adjust the ion concentrations.

Fourth, you should analyze the data. You can look for correlations between the resting potential and the concentration of the ions.

Finally, you should form a conclusion. From your data, you should be able to determine which ion(s) are responsible for the resting potential.

By following these steps, you can conduct an experiment to determine the cause of the resting potential by adjusting the ionic concentrations.

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It is a good idea to include reactions that contain substrate but not enzyme in your kinetic analysis because: it provides a baseline or control for the reaction.

One of the reasons is that it provides a baseline or control for the reaction. By studying the reaction without the enzyme, one can determine how much of the reaction is due to the enzyme and how much is due to other factors.

Additionally, it can help to identify any non-specific interactions that may be occurring between the substrate and other components of the reaction. Another reason is that it can help to establish the limits of detection for the assay. This is important for ensuring that the assay is sensitive enough to detect changes in enzyme activity under various conditions.

For example, if the assay is not sensitive enough, it may not be possible to detect changes in enzyme activity due to small changes in the reaction conditions. Finally, studying reactions that contain substrate but not enzyme can help to identify any interference or background signals that may be present in the assay.

This is important for ensuring that the assay is specific to the enzyme of interest and is not measuring other unrelated activities. By including reactions that contain a substrate but not an enzyme, one can identify any background signals and subtract them from the measurement of enzyme activity to obtain a more accurate result.

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Cephalosporin C is an antibiotic containing multiple functional groups. The functional groups present in this molecular are an amide, an alcohol, and an amine.

An amide is a functional group composed of a carbonyl group (C=O) bound to a nitrogen atom. An alcohol is a functional group composed of an oxygen atom bonded to a hydrogen atom, and an amine is a functional group composed of a nitrogen atom bound to two hydrogen atoms.

The amide functional group is present in cephalosporin C because it contains an amide nitrogen atom connected to a carbonyl carbon atom. The alcohol functional group is present in cephalosporin C because it contains an alcohol oxygen atom connected to a hydrogen atom. The amine functional group is present in cephalosporin C because it contains an amine nitrogen atom connected to two hydrogen atoms.

In conclusion, cephalosporin C is an antibiotic containing multiple functional groups, which are an amide, an alcohol, and an amine.


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The given statement "the lattice energy of a crystal is less than the energy necessary to pull the crystal apart" is false.

The lattice energy of a crystal is greater than the energy necessary to pull the crystal apart because the lattice energy represents the amount of energy released when oppositely charged ions come together to form a crystal lattice structure. In other words, it is the energy released when the cations and anions of an ionic compound come together to form a solid crystal. This energy is strong because of the strong electrostatic attraction between the cations and anions.

On the other hand, the energy required to pull the crystal apart is called the dissociation energy or bond energy, and it represents the energy required to break the bonds between the cations and anions in the crystal lattice. This energy is weaker than the lattice energy because it only involves breaking one bond at a time, while the lattice energy involves breaking all the bonds in the crystal simultaneously. Therefore, the lattice energy is greater than the dissociation energy.

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In the infrared spectrum of the ester you synthesized, specifically, you should look for the presence of ester functional group peaks and the absence of reactants' peaks

When looking at the infrared spectrum of the ester that you synthesized, you should specifically look for the absence of the reactants. This can be seen in the form of absorption peaks in the infrared spectrum. Any absorption peaks that are present in the spectrum indicate that the reactants are still present in the ester, while a lack of absorption peaks suggests that the reactants have been fully converted into the ester. Therefore, the absence of peaks in the infrared spectrum is a good indication that the reactants have been consumed in the reaction and the synthesis was successful.

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From the balanced equation, Mg(s) + 2HCl(aq) -> MgCl2(aq) + H2(g), we can determine the volume of hydrogen gas produced from 3 moles of magnesium metal reacting with the acid at standard temperature and pressure (STP).

According to the balanced equation, 1 mole of magnesium reacts with 1 mole of hydrogen gas. Therefore, 3 moles of magnesium will produce 3 moles of hydrogen gas.

At STP, 1 mole of any gas occupies 22.4 liters. Thus, 3 moles of hydrogen gas will occupy:

3 moles × 22.4 liters/mole = 67.2 liters

So, the volume of hydrogen gas produced is 67.2 liters at STP.

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The volume of the sodium carbonate needed to precipitate is 31.248 ml. This is calculated using the dilution formula.

The molarity of the solution and the volume of the first solution can be correlated with the molarity and the volume of diluted solution. It is called as dilution formula.

Molar concentration is the another term for molarity. Molarity is a measure of the concentration of a chemical species in particular of a solute in a solution in terms of amount of substance per unit volume of solution.

The expression for molarity of the solution is,

M1 V1 = M2 V2

here we have 0.125 m sodium carbonate solution would be needed to precipitate the calcium ion from 37.2 ml of 0.105 m cacl2 solution.  

putting all the values we get,

0.105 * 37.2 = 0.125 * V2

V2 = 31.248

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The type of fire that is self-heating is spontaneous combustion. This occurs when a combustible material (such as paper, rags, oil, and even coal) is heated to its ignition temperature through a process of oxidation. The heat produced from the oxidation will then cause the material to burn.

combustion refers to a fire that starts on its own due to heat generated by chemical reactions rather than an external source. This type of fire typically happens in organic materials that produce heat during natural decay, such as hay or wood chips that have been compressed or stored in large quantities. When the heat produced by these chemical reactions surpasses the material's ability to dissipate it, the temperature will keep rising until the material catches fire. The other types of fire are as follows:

Diffusion flame A diffusion flame is a fire that occurs when a fuel source is mixed with air and burned in the presence of an oxidizer. Diffusion flames are common in industry and can be found in applications like boilers, furnaces, and power plants

.Premixed flame A pre-mixed flame is a type of flame that occurs when a fuel source is mixed with air before it is ignited. This type of flame is often used in internal combustion engines.

Smoldering A smoldering fire is a slow, low-temperature flame that occurs when materials like embers or coals continue to burn without visible flame. This type of fire is often found in wildfires, and it can be very dangerous because it can spread underground or in places where people might not see it.

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Hydrofluoric acid is not a strong acid.

Hydrofluoric acid (HF) is a weak acid because it does not completely dissociate in water to form [tex]H^+[/tex] ions. In water, HF undergoes a partial dissociation to form [tex]H^+[/tex] and [tex]F^-[/tex] ions according to the following equilibrium:

[tex]HF + H_2O[/tex]  ⇌  [tex]H_3O^+ + F^-[/tex]

This equilibrium favors the reactant side, meaning that most of the HF molecules remain as HF in solution, with only a small percentage dissociating to form  [tex]H^+[/tex] ions.

In contrast, hydrochloric acid (HCl), hydrobromic acid (HBr), and hydroiodic acid (HI) are strong acids because they completely dissociate in water to form  [tex]H^+[/tex]  ions. These strong acids have weak conjugate bases, which makes the acid dissociation reaction highly favorable.

The strength of an acid is related to its tendency to donate a proton ( [tex]H^+[/tex] ) in water. The stronger the acid, the more readily it donates  [tex]H^+[/tex]  ions.

Therefore, hydrochloric acid, hydrobromic acid, and hydroiodic acid are stronger acids than hydrofluoric acid.

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The molarity of the K₂CO₃ solution is 2.65 m.

The molarity of an aqueous potassium carbonate solution can be calculated by using the following formula:

Molarity = moles of solute / liters of solution.

In this case, the moles of solute is 5.84 and the volume of the solution is 2.20 liters. Therefore, the molarity of the potassium carbonate solution is 5.84 moles / 2.20 liters = 2.65 m.

Molarity is an important concept in chemistry and is used to measure the concentration of a solution. Molarity is expressed in terms of moles of solute per liter of solution. In this case, the solution contains 5.84 moles of potassium carbonate per 2.20 liters of water. This makes the molarity of the solution 2.65 m.

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Sodium hypochlorite serves as a bleaching agent. Dyes, humectants, cavity fluid, and phenol are not typically used as bleaching agents.

Bleaching agents are chemicals that are used to remove colors or stains from materials, typically textiles or hard surfaces.

They are commonly used in the washing and cleaning industries, as well as in some industrial processes. Bleach is a compound that removes or lightens colors, brightens whites, and eliminates bacteria and viruses from fabrics, food, drinking water, and hard surfaces such as counters, sinks, and floors.

It is used as a disinfectant to kill bacteria and viruses in both the food and industrial sectors. It is also used to purify drinking water, keep swimming pools clean, and remove discolorations from fabrics and hard surfaces in the home. Sodium hypochlorite is one of the most common bleaching agents used.

Therefore sodium hypochlorite is the correct option.

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The ratio of [HCO₃⁻] to [HCO₂H] in an acetate buffer is 5.01.

The ratio of [HCO₃⁻] to [HCO₂H] (formic acid) in an acetate buffer at pH 4.50 is determined by the Henderson-Hasselbalch equation:

pH = pKa + log ([HCO₃⁻]/[HCO₂H]).
[HCO₃⁻]/[HCO₂H] = 10^(pH-pKa)
= 10^(4.50 - 3.80)
= 5.01


To further understand the buffering capacity of an acetate buffer, we must first understand the role of formic acid and bicarbonate in an acetate buffer.

Formic acid is an organic acid and bicarbonate is a salt of carbonic acid. Both of these species can form and break down as needed to maintain the pH of the buffer.

As the pH of the buffer is increased, the formic acid will break down, forming more bicarbonate.

On the other hand, as the pH of the buffer is decreased, more formic acid will form, resulting in fewer bicarbonate ions.

The buffering capacity of an acetate buffer is dependent on the relative concentrations of formic acid and bicarbonate ions, and these concentrations can vary depending on the pH of the buffer.

In summary, the ratio of [HCO₃⁻] to [HCO₂H] is found to be 5.01 in an acetate buffer at pH 4.50.

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The smallest unit of life that can sustain itself is called an organism.

An organism is a living entity that is composed of one or more cells, which are the basic structural and functional units of life. These cells are capable of carrying out all the necessary processes for the organism's survival, including metabolism, growth, reproduction, and response to stimuli. An organism can exist as a single-celled or multi-celled entity, and can range in size from microorganisms like bacteria to large mammals like elephants. The biosphere is the term used to describe the global ecological system that encompasses all living organisms and their interactions with each other and their physical environment. A population is a group of individuals of the same species living in a specific geographic area.

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Quartz is a solid in which atoms are not arranged in an orderly pattern.

The given statement is false.

Quartz is a type of mineral that is naturally occurring. It has a chemical formula of SiO2 or silicon dioxide, and its crystal structure is hexagonal or trigonal in shape. Quartz is one of the most abundant minerals on the earth's surface. It is composed of tiny particles of silicon dioxide, which have a distinctive tetrahedral arrangement.

The atoms in quartz are arranged in an orderly pattern, which makes it a crystalline solid. These orderly arrangements of atoms are what give quartz its unique physical and chemical properties.Quartz is a hard, durable mineral that is used in many different industries. It is used to make glass, ceramics, electronics, and semiconductors, among other things.

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Carbon dioxide (CO2) is a gas that is slightly soluble in water. As the temperature of water increases, the solubility of CO2 decreases.

This is due to the fact that, as temperature increases, the amount of dissolved CO2 gas in water decreases.

This phenomenon is known as Henry's law, which states that the solubility of a gas in a liquid is proportional to the partial pressure of the gas above the liquid.

As temperature increases, the partial pressure of CO2 gas above the liquid increases, causing its solubility to decrease.

The solubility of CO2 gas in water is also affected by pH. In general, as the pH of water decreases, the solubility of CO2 in water increases.

This is because the solubility of CO2 in water is reduced by the presence of bicarbonate ions, which are created by the dissociation of carbonic acid, a weak acid.

As the pH decreases, the amount of bicarbonate ions in solution decreases, which in turn increases the solubility of CO2.

The solubility of CO2 gas in water decreases as temperature increases and pH decreases. As temperature increases, the partial pressure of CO2 above the liquid increases, resulting in decreased solubility.

As the pH of water decreases, the solubility of CO2 increases due to the decreased amount of bicarbonate ions in solution.

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A polar covalent bond is associated with unequal sharing of electrons.

A polar covalent bond is a covalent bond in which electrons are not equally shared between the bonded atoms. It is formed when two or more atoms share electrons in such a manner that the nucleus of one atom exerts a greater attraction on the electrons than the other atom.

As a result of the unequal sharing of electrons, the atoms have partial charges. In polar covalent bonds, the electrons spend more time near the atom with a stronger nucleus. As a result, one atom in a polar covalent bond becomes partially negative, and the other becomes partially positive. Polar covalent bonds can be found in a variety of compounds, including water, ammonia, and hydrogen chloride, among others.

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Evaporites form as ions (minerals) precipitate out of an evaporating solution. The correct option is B.

Evaporites are minerals that are created as a result of the evaporation of water. The minerals are usually found in salt pans or salt lakes. Salt pans are shallow pans that are usually found in hot and dry regions of the world. In most cases, salt pans are usually found in places where water sources are limited. Evaporites form as ions (minerals) precipitate out of an evaporating solution.

As the water evaporates, it leaves behind salt crystals. Over time, these salt crystals can build up and form a layer of salt. The process of evaporation and deposition can repeat itself many times over the years, resulting in the formation of thick layers of salt.

There are different types of evaporites, and they are classified based on the minerals that are formed. Some of the most common types of evaporites include halite, gypsum, and anhydrite. Halite is the most common type of evaporite, and it is usually found in salt pans and salt lakes. Gypsum and anhydrite are usually found in areas that have been submerged in water for long periods of time.

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Answer: It takes 92.4 s for the concentration of the reactant in the reaction to fall to one-sixteenth of its initial value.

The first-order reaction has a half-life of 23.1 s, which means that it takes 23.1 s for the concentration of the reactant to decrease to half of its initial value. Since the concentration needs to be reduced to one-sixteenth of its initial value, it will take four half-lives of the reaction, or 92.4 s in total.

This can be mathematically shown using the formula of a first-order reaction:

[A]t = [A]0 X e^(-kt)

Where:
[A]t is the concentration of the reactant at time t
[A]0 is the initial concentration of the reactant
k is the rate constant of the reaction

To calculate the time required for the concentration to fall to one-sixteenth of its initial value, the equation can be rearranged as:

t = -(1/k)ln([A]t/[A]0)

By substituting the values of the half-life, initial concentration, and the desired concentration, we can calculate the time required for the concentration of the reactant to reduce to one-sixteenth of its initial value.

Therefore, it takes 92.4 s for the concentration of the reactant in the reaction to fall to one-sixteenth of its initial value.


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When equal masses of baking soda react with vinegar, lemon juice, and lactic acid, lactic acid will produce the most gas.

Lactic acid is a weak acid that can be used to neutralize baking soda, producing the greatest amount of carbon dioxide gas. When baking soda is mixed with lactic acid, the reaction between the two creates carbon dioxide, a gas.

This reaction is an example of a neutralization reaction, which is when an acid and a base are combined to form a salt and water. When this happens, the acid releases gas, in this case, carbon dioxide.

As lactic acid is the weakest of the three, it will produce the most gas when it reacts with the baking soda.

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Synthesis and decomposition reactions are two types of chemical reactions that involve the formation and breaking of chemical bonds between atoms and molecules.

A synthesis reaction, also known as a combination reaction, occurs when two or more reactants combine to form a single, more complex product. The general equation for a synthesis reaction is A + B → AB.

A decomposition reaction, on the other hand, is the opposite of a synthesis reaction. It occurs when a single reactant breaks down into two or more simpler products. The general equation for a decomposition reaction is AB → A + B.

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The nonzero quantity is Heat Transfer.

Heat Transfer is the only quantity that must be nonzero for a constant pressure process at 300K and 1 atm. This is because Heat Transfer is the amount of energy that is required to maintain constant pressure.

All other quantities in this process, such as Work, Internal Energy, and Enthalpy, are zero for a constant pressure process at a given temperature and pressure.

Therefore, the quantity that is nonzero for this constant pressure process at 300k and 1 atm is Heat Transfer.

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The number of molecules of propene that must be polymerized to make 3.50 g of polypropylene is 5.02 x 10²² molecules.

In order to answer this question, we must first understand the concept of a mole. A mole is a unit of measurement that is equal to 6.022 x 10^23 molecules or particles. This means that in order to calculate the number of molecules of propene required to make 3.50 g of polypropylene, we must convert the mass given (3.50 g) into moles.

We know that the molecular weight of propene is 42g/mol, so we can use the following equation to find the number of moles of propene required: 3.50 g / 42g/mol = 0.0834 mol.

Since a mole is equal to 6.022 x 10²³ molecules of propene, we can now use this equation to find the number of molecules required:

0.0834 mol x (6.022 x 10²³ molecules/mol) = 5.02 x 10²² molecules of propene.

Therefore, in order to make 3.50 g of polypropylene, 5.02 x 10²² molecules of propene must be polymerized.

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The effectiveness of a buffer solution in resisting pH changes is determined by the concentration ratio of the conjugate base and acid, as well as the buffer capacity.

A buffer is defined as a chemical substance or mixture of substances that have the ability to minimize a change in pH when an additional amount of strong acid or a strong base is added. How successful was the buffer solution in resisting pH changes when an additional amount of strong acid or a strong base was added? The effectiveness of a buffer solution in resisting pH changes is determined by the buffer capacity. A buffer has a strong ability to resist changes in pH when there is a high buffer capacity. A buffer solution is created by mixing a weak acid and its corresponding salt, or a weak base and its corresponding salt, in equal amounts. The buffer solution can effectively resist pH changes when a small amount of strong acid or strong base is added to it. When a strong acid is added to a buffer solution, the acid is neutralized by the buffer's weak base component. When a buffer solution is subjected to a strong base, it reacts with the buffer's weak acid component to produce water and the conjugate base of the buffer. The buffer capacity is a measure of the amount of acid or base that can be added to the buffer without causing a significant change in pH.

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Answer: The molarity of the glucose solution is 0.94 moles/liter, or 0.94 M.

The concentration of the glucose solution can be expressed as molarity. Molarity is a measure of the number of moles of solute in one liter of a solution. To calculate the molarity, you need to determine the number of moles of glucose in the solution.

To do this, you need to know the molar mass of glucose, which is 180.156 g/mol. Therefore, 170.1 g of glucose would equal 0.94 moles of glucose.

To calculate the molarity, divide the number of moles of glucose by the volume of the solution. The volume of the solution is 1 liter. Therefore, the molarity of the glucose solution is 0.94 moles/liter, or 0.94 M.

The concentration of a solution can be expressed as molarity, which is a measure of the amount of solute in one liter of a solution. To calculate molarity, you need to know the molar mass of the solute, and divide the number of moles of the solute by the volume of the solution.

In this case, the molar mass of glucose is 180.156 g/mol, and 170.1 g of glucose would equal 0.94 moles of glucose. The volume of the solution is 1 liter, and thus the molarity of the glucose solution is 0.94 moles/liter, or 0.94 M.

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After 0.100 s, the average rate of reaction over the first 100 milliseconds is 0.25 mol s^-1. if the initial concentration of n2 was 0.400 m and the concentration of n2 was 0.350 m.

The average rate of reaction over the first 100 milliseconds when the initial concentration of N2 was 0.400 M and the concentration of N2 was 0.350 M after 0.100 s can be calculated as follows:

Average rate of reaction = {N2 consumed or produced in mol} / {time in seconds}

The balanced chemical equation for the reaction is:

N2(g) + 3H2(g) → 2NH3(g)

As per the given equation, one mole of N2 reacts to produce two moles of NH3. So, the mole of N2 consumed in the reaction would be equal to half the mole of NH3 produced.

Therefore, mole of N2 consumed = (1/2) × (0.050 M) = 0.025 M

Now, the average rate of reaction can be calculated as follows:

Average rate of reaction = {N2 consumed or produced in mol} / {time in seconds}

= 0.025 mol / 0.100 s

= 0.25 mol s^-1

Therefore, the average rate of reaction over the first 100 milliseconds is 0.25 mol s^-1.

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