Identify the indicator that can be used at the lowest pH.
A) 2,4-dinitrophenol
B) thymol blue
C) crystal violet
D) thymolphthalein
E) methyl red

The pOH of the solution is approximately 10.59. The correct answer is C) 10.59.

To calculate the pOH of a solution that contains 3.9 × 10^-4 M [tex]H_{3}O[/tex]⁺ at 25°C, follow these steps:

1. Calculate the pH using the given [tex]H_{3}O[/tex]⁺ concentration.
pH = -log[H3O⁺]
pH = -log(3.9 × 10^-4)
pH ≈ 3.41

2. Use the relationship between pH and pOH at 25°C.
pH + pOH = 14

3. Calculate the pOH.
pOH = 14 - pH
pOH = 14 - 3.41
pOH ≈ 10.59

So, the pOH of the solution is approximately 10.59. The correct answer is C) 10.59.

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In future purification procedures, adjusting the pH and using different column matrices could be effective in sharpening peak 2 like peak 1.

Peak 1 appears to be sharper than peak 2, which could indicate differences in the physical properties of the molecules being separated or differences in the purification protocol. Adjusting the pH of the mobile phase or buffer system could affect the retention time and selectivity of the column, potentially leading to sharper peaks.

Additionally, using a different column matrix with a higher resolution could improve peak separation and sharpen the peaks. It may also be helpful to optimize the sample preparation or injection volume to ensure the highest possible resolution. Overall, it is important to carefully evaluate and troubleshoot the purification protocol to identify potential areas for improvement in order to obtain sharper and more accurate separation of the target molecules.

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The pressure in the tank is 31.5 atm.

We  use the Ideal Gas Law equation (PV=nRT) to solve for the pressure in the tank. We know the volume (25.0 L), the number of moles of hydrogen (12.0 mol) and nitrogen (4.0 mol), and the temperature (298 K). We  assume that the gases behave ideally, meaning that there is no intermolecular attraction between the gas molecules and that the volume of the gas molecules is negligible compared to the volume of the container.

To find the pressure, we need to solve for P. We can rearrange the Ideal Gas Law equation to solve for P:

P = (nRT)/V

where P is the pressure, n is the number of moles, R is the gas constant (0.08206 L·atm/mol·K), T is the temperature in Kelvin, and V is the volume.

Plugging in the given values, we get:

P = ((12.0 + 4.0) mol)(0.08206 L·atm/mol·K)(298 K)/(25.0 L) = 31.5 atm

Therefore, the pressure in the tank is 31.5 atm.

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The statements (ii) and (iii) are the true statement which include about ozone . So, option (d) is correct choice.

The ozone layer is the layer that surrounds the earth and contains a high concentration of O₃ ozone. Ozone O₃ is a gas molecule composed of three oxygen atoms. Ozone is commonly known as photochemical "smoke" and is harmful to respiration.

It is formed by the dissociation of two atoms forming oxygen. It is a harbinger of acid rain. Exposure to ozone can harm human health. Ozone absorbs some wavelengths of ultraviolet radiation and protects the earth's surface from dangerous radiation. Therefore, it is clear from the above discussion that (ii) and (iii) are correct statements about ozone.

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The chemist made a dilute solution of Sodium nitrate and water.

Based on the given information, the chemist added 3.0 g of sodium nitrate to 1.0 L of water and stirred to make a clear and colorless solution. Then, the chemist added another 1.0 g of sodium nitrate and stirred, but the solution remained clear and colorless. From this, we can infer that the original solution was not saturated, meaning that it had the capacity to dissolve more sodium nitrate.

The additional 1.0 g of sodium nitrate did not cause the solution to become cloudy or change color, indicating that it was able to dissolve into the solution. This suggests that the original solution was likely a dilute solution, as it was able to dissolve more sodium nitrate without reaching its saturation point. A dilute solution is a solution with a low concentration of solute relative to the solvent. In this case, the solute is sodium nitrate and the solvent is water.

Therefore, we can conclude that the original solution made by the chemist was likely a dilute solution of sodium nitrate in water.

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The kidneys are important to our survival because they play a critical role in maintaining the balance of fluids and electrolytes in the body, as well as removing waste and toxins from the blood. Options 1 and 2 are correct.

The kidneys filter waste from the blood, such as excess water, salts, urea, and other waste products. They remove urine from the body, which helps to maintain the proper balance of fluids and electrolytes in the body. The kidneys do not increase the sugar level in the blood, but they do play a role in regulating blood sugar levels by producing hormones such as renin and erythropoietin.

The kidneys do not make new blood for the body, but they do produce a hormone called erythropoietin that stimulates the production of red blood cells in the bone marrow. The kidneys are essential to our survival because they help maintain the proper balance of fluids and electrolytes, remove waste and toxins from the blood, and play a role in regulating blood pressure and red blood cell production. Options 1 and 2 are correct.

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In order for water reabsorption to occur, the solute concentration of the medulla needs to increase.

Water reabsorption occurs in the kidneys by creating a concentration gradient in the medulla of the kidney. This is achieved by active transport of ions such as sodium and chloride, which creates a hypertonic environment in the medulla. As a result, water diffuses out of the descending loop of Henle and the collecting duct, and is reabsorbed into the bloodstream.

The solute concentration of the medulla is therefore crucial in creating this gradient, and if it is not maintained, water reabsorption may be impaired, leading to dehydration or other issues.

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The base that is in baking soda is C) [tex]NaHCO_{3}[/tex], also known as sodium bicarbonate.

Sodium bicarbonate, also known as baking soda, is a commonly used ingredient in baking because of its chemical properties. When baking soda is combined with an acid (such as vinegar, lemon juice, buttermilk, or yogurt) and a liquid, it produces carbon dioxide gas. This gas helps to leaven, or raise, the baked goods, making them lighter and fluffier.

Baking soda is a mild base, which means it can neutralize acidic ingredients in a recipe. It also reacts with heat to produce carbon dioxide gas, which causes doughs and batters to rise. This reaction occurs quickly, so it's important to get the baked goods into the oven as soon as possible after adding the baking soda.

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246.0 grams of ethanol, c2h5oh, can be boiled with 206.2 kj of heat energy? the molar heat of vaporization of ethanol is 38.6 kj/mol.

We can use the following equation to determine how much ethanol can be boiled using 206.2 kJ of heat energy:

q = n*ΔHvap

where n is the substance's (in moles) vaporized amount of ethanol, Hvap is the molar heat of vaporization of ethanol, and q is the amount of heat energy given.

First, we may use the equation to determine how much ethanol was vaporized:

q/ΔHvap = n

Inputting the values provided yields:

5.34 mol is equal to n = 206.2 kJ/38.6 kJ/mol.

Next, we can convert the amount of substance to mass using the molar mass of ethanol (46.07 g/mol):

m = n * M

where M is ethanol's molar mass.

When we change the values, we obtain:

246.0 g= 5.34 mol * 46.07 g/mol

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C) 1) H2O, heat; 2) NaOEt; EtOH reagents might be used to convert cis-2-butene into trans-2-butene.

The reagents needed to convert cis-2-butene into trans-2-butene are H2O and heat, followed by NaOEt and EtOH. The H2O and heat are used to create an acid-catalyzed hydration reaction, which results in the formation of a cis-2-butene-diol.

The NaOEt is then used to protonate the hydroxyl group of the diol, resulting in the formation of trans-2-butene. Finally, EtOH is used as a solvent to facilitate the reaction. This reaction is an example of an acid-catalyzed isomerization, which is a process that changes the position of functional groups on a molecule to create a new isomer.

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If Kim decided to produce another chromatogram using various substances, including green food coloring then she would observe two distinct spots on the chromatogram above the pencil spot where the green food color was placed.

In this process, she marked the paper with pencil spots and used a clean, dry, fine-tip pipet to place the drops of different substances.

After allowing the solutes to travel through the paper, she removed the paper from the beaker and dried it. If the green food color consisted of two dyes, Kim would observe two separate spots or bands above the pencil mark on the dried chromatogram where the green food color was placed.

These separate spots indicate that the green food color is a mixture of two different dyes, which were separated during the chromatography process.

Since the chromatogram was developed in distilled water, the solubility of the dyes in water would be a key factor in their separation. Dyes that are more soluble in water would travel faster through the paper and appear higher up on the chromatogram.

Dyes that are less soluble in water would travel more slowly and appear lower down on the chromatogram. Assuming the two dyes in the green food color have different solubilities in water, they would separate as they travel through the paper, resulting in two distinct spots on the chromatogram above the pencil spot where the green food color was placed.

The exact appearance and positions of these spots would depend on the specific properties of the dyes and the conditions of the chromatography.

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Solvents used to dissolve are kcl ,motor oil (a mixture of hydrocarbons),  wax (a mixture of high molecular weight hydrocarbons) and hexanol (CH₃CH₂CH₂CH₂CH₂CH₂OH).

a) Due to its ionic nature and capacity to create hydration shells with water molecules, KCl may dissolve easily in water and aids in stabilizing the ions in solution.

b) Because motor oil is made up of a variety of hydrocarbons, it is difficult to dissolve it in polar solvents like water or ethanol. For dissolving motor oil, non-polar solvents like benzene or hexane would be preferable.

c) Since wax is a combination of hydrocarbons with a high molecular weight, it is also difficult to dissolve in polar solvents. Wax would dissolve better in non-polar solvents like benzene or hexane.

d) Hexanol is soluble in both polar and non-polar solvents because it is a polar molecule containing both hydrophilic and hydrophobic domains.

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Complete question

Below is a list of common solvents.

Which solvent can you use to dissolve the following solutes? explain why you would use them. more than one solvent can be used for a solute.

Solvents water (h₂o)  benzene ethanol (CH₃CH₂OH) hexane

a) kcl

b) motor oil (a mixture of hydrocarbons)

c) wax (a mixture of high molecular weight hydrocarbons)

d) hexanol (CH₃CH₂CH₂CH₂CH₂CH₂OH)

The molarity of sodium hydroxide involved in the neutralization reaction is 0.251 M.

The molarity of a solution can be calculated using the following expression;

CaVa = CbVb

Where;

According to this, 43.8mL of sodium hydroxide reacts with 15.7 mL of 0.700M phosphoric acid. The molarity of sodium hydroxide can be calculated as follows:

0.700 × 15.7 = 43.8 × Cb

10.99 = 43.8Cb

Cb = 10.99 ÷ 43.8

Cb = 0.251 M

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Answer:

Using Henry's law, we know that solubility is directly proportional to pressure:

S1/P1 = S2/P2

where S1 and P1 are the initial solubility and pressure, and S2 and P2 are the new solubility and pressure.

Plugging in the values given:

16.9 g/L / 5.00 atm = S2 / 3.00 atm

Solving for S2:

S2 = 10.14 g/L

Therefore, the solubility of the gas at 20 °C and 3.00 atm pressure is 10.14 g/L.

29.5 mL of 0.0839 M NaOH are required to titrate 25.0 mL of to the equivalence point.

The balanced equation for the titration of NaOH with an acid is:

NaOH + HX → NaX + H2O

At the equivalence point, the moles of NaOH are equal to the moles of HX. We can use the equation:

Moles = concentration × volume

To calculate the moles of NaOH in 25.0 mL of 0.0839 M solution:

Moles of NaOH = 0.0839 M × 0.0250 L = 0.00210 mol

Since the moles of NaOH are equal to the moles of HX at the equivalence point, we need 0.00210 mol of HX to reach the equivalence point. The volume of the unknown acid required can be calculated using its concentration:

Moles of HX = concentration × volume

0.00210 mol = concentration × volume

volume = 0.00210 mol / concentration

Substituting the given concentration of NaOH and solving for volume:

Volume = 0.00210 mol / 0.0839 M = 0.0250 L = 25.0 mL

Therefore, the answer is A) 29.5 mL.

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The metabolic pathway by which glucose is synthesized from non-carbohydrate precursors such as amino acids, lactate, or glycerol is known as gluconeogenesis. This process occurs primarily in the liver.

When the intake of dietary is insufficient or absent, gluconeogenesis provides glucose. It is also required for the maintenance of acid-base balance, amino acid metabolism, and the synthesis of carbohydrate-derived structural components.

Glycolysis has three irreversible steps:

1. Hexokinase/Glucokinase: This enzyme catalyzes the first step of glycolysis, the phosphorylation of glucose to glucose-6-phosphate.

2. phosphofructokinase-1: This enzyme catalyzes the third step of glycolysis by converting fructose-6-phosphate to fructose-1,6-bisphosphate.

3. Pyruvate kinase: This enzyme catalyzes the final step of glycolysis, the conversion of phosphoenolpyruvate to pyruvate.

Glycogen phosphorylase, phosphorylase kinase, and phosphoglucomutase are key enzymes in glycogenolysis.

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atom is sphere so we can write cicumference as 2pier

now put value

2 x 3.14 x 43

= 270.04

hence the circumcentre is 270.04

The density of CO at 1140 torr and 75.0 °C is 1.12 g/L.

To calculate the density of CO at 1140 torr and 75.0 °C, we need to use the ideal gas law equation: PV = nRT, where P is the pressure in torr, V is the volume in liters, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin: 75.0 °C + 273.15 = 348.15 K.

Next, we need to find the number of moles of CO. To do this, we can use the equation n = PV/RT. We have P = 1140 torr, V = 1 L (since we're looking for density in g/L), R = 0.08206 L•atm/mol•K (the gas constant), and T = 348.15 K. Plugging these values in, we get:

n = (1140 torr × 1 L) / (0.08206 L•atm/mol•K × 348.15 K)
n = 0.0402 mol

Now we can find the mass of CO using the molar mass of CO, which is 28.01 g/mol.

mass = n × molar mass
mass = 0.0402 mol × 28.01 g/mol
mass = 1.12 g

Finally, we can calculate the density by dividing the mass by the volume:

density = mass / volume
density = 1.12 g / 1 L
density = 1.12 g/L

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a. The polarity of a bond depends on the electronegativity difference between the two atoms. Fluorine (F) is the most electronegative element in the periodic table.

Thus, the bond between F and the other elements will be the most polar. Therefore, the most polar bond in each group will be:

a. C-F, b. Si-F, c. S-F, d. Ti-Cl, e. C-H, f. Al-Br

b. Between P-Cl and S-Cl, the bond between S and Cl will be more polar because sulfur is more electronegative than phosphorus.

c. The polarity of a bond depends on the electronegativity difference between the two atoms. Since fluorine is the most electronegative element, the S-F bond will be the most polar among the given bonds. Therefore, the most polar bond in this group will be S-F.

d. Since chlorine is more electronegative than silicon or germanium, the bond between Ti and Cl will be the most polar.

e. Between C-H, Si-H, and Sn-H, the C-H bond will be the least polar because carbon and hydrogen have similar electronegativities. As we move down the periodic table, electronegativity decreases, so the Sn-H bond will be the most polar.

f. Bromine (Br) is more electronegative than aluminum (Al), gallium (Ga), indium (In), and thallium (Tl). Therefore, the bond between Tl and Br will be the most polar

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Answer: 26C is 25.0 torr

Explanation: The decrease in vapor pressure is proportional to the molality of the solution, so the vapor pressure of the solution at 26°C is 25.0 torr.

First, we need to find the number of moles of glucose and water present in the solution:

n(glucose) = 16.0 g / 180.0 g/mol = 0.089 mol

n(water) = 80.0 g / 18.0 g/mol = 4.44 mol

Next, we'll find the mole fraction of water in the solution:

X_water = n(water) / (n(glucose) + n(water)) = 4.44 / (0.089 + 4.44) = 0.989

Finally, we can find the vapor pressure of the solution using Raoult's law:

P_solution = X_water * P_purewater = 0.989 * 25.21 torr = 25.0 torr

So the vapor pressure of the solution at 26°C is 25.0 torr.

The mechanism by which acylation of an amine with an acid chloride takes place is nucleophilic acyl substitution.

In this mechanism, the nitrogen atom of the amine acts as a nucleophile and attacks the electrophilic carbon atom of the acid chloride. This results in the formation of an intermediate, which then undergoes a series of proton transfers and the elimination of a chloride ion to form the amide product. This mechanism is different from electrophilic aromatic substitution, nucleophilic addition, and electrophilic addition, which involve different types of reactions and mechanisms. However, it shares some similarities with nucleophilic aromatic substitution, which also involves the attack of a nucleophile on an electrophilic carbon atom.

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Answer:

26.4 L

Explanation:

O₂ + C₅H₈

Given: 80 g of C₅H₈

Find actual gram-formula mass of C₅H₈: 68 g

Create a proportion: 80 g/68 g = 1.176…

Find actual gram-formula mass of O₂: 16 g

Find new mass of O₂: 16 g * 1.176… = 19 g

Use dimensional analysis for conversion (see attachment).

Option B is correct. Monomer is single molecular unit that can form polymers. Small molecules often have a functional group that allows them to interact chemically with other monomers to form polymers.

In polymer chemistry, monomers act as the building blocks for the creation of polymers, which are big molecules made up of repeated monomer units.  Natural or manufactured monomers can have a wide variety of chemical structures and characteristics.

Amino acids, nucleotides, and sugars are a few examples of natural monomers that can combine to generate biopolymers like proteins, nucleic acids, and carbohydrates.

Contrarily, synthetic monomers are created to have particular qualities and can be utilized to create a wide range of materials, including coatings, adhesives, and plastics.

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Complete question

What is a monomer?

A. a mixture of different molecules.

B. single molecular unit that can form polymers.

C. a molecule that is not biological crystal lattice with ordered atomic structure long chain of similar, bonded molecules.

Granulocytes and agranulocytes are two types of white blood cells (leukocytes) found in the human body.

Granulocytes are white blood cells that have granules in their cytoplasm. These granules contain enzymes and other proteins that help the cells to fight infection. There are three types of granulocytes: neutrophils, eosinophils, and basophils.

- Neutrophils are the most abundant type of granulocyte and play a key role in fighting bacterial infections.
- Eosinophils are involved in fighting parasitic infections and allergies.
- Basophils are involved in allergic reactions and play a role in inflammation.

Agranulocytes, on the other hand, do not have granules in their cytoplasm. Instead, they have a uniform appearance. There are two types of agranulocytes: lymphocytes and monocytes.

- Lymphocytes are involved in the immune response and are responsible for producing antibodies to fight infection. They are divided into two types: B cells and T cells.
- Monocytes are the largest type of white blood cell and are involved in the immune response against viruses and bacteria. They also play a role in cleaning up debris from dead cells and tissue damage.

In summary, granulocytes are white blood cells that have granules in their cytoplasm, while agranulocytes do not have granules. Examples of granulocytes include neutrophils, eosinophils, and basophils, while examples of agranulocytes include lymphocytes and monocytes.

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An emulsion is a mixture of two liquids that are not normally soluble in each other, such as oil and water. The liquids are held together by an emulsifying agent, such as lecithin, which acts as a stabilizer.

Using brine can help with an emulsion because the salt in the brine can help to break down the proteins in the emulsifying agent, causing it to bind more strongly with the liquids and improving the stability of the mixture. Additionally, the high salt content in brine can also help to inhibit the growth of bacteria, which can be beneficial when working with perishable ingredients in an emulsion.

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The concentration of one molar of ascorbic acid dissolved in an effervescent tablet of 500 milligrams with a volume of 150 milliliters is 0.0189 M.

Based on the words used, it seems to be asking for the concentration of ascorbic acid in a solution made from an effervescent tablet. The information provided is the mass of the tablet (500 milligrams) and the volume of the solution (150 milliliters).

To calculate the concentration of ascorbic acid, we need to know the molar mass of the compound. The molar mass of ascorbic acid is 176.12 g/mol. To convert the mass of the tablet to moles, we divide it by the molar mass:

Next, we divide the moles of ascorbic acid by the volume of the solution:

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The complete question is:

¿Cuál es la concentración en mol/L de ácido acetilsalicílico disuelto en una pastilla efervescente de 500 miligramos que se ha disuelto en un volumen de 150 mililitros?

Since carbon is smaller than nickel, it causes a point defect called a substitutional defect when it takes up a lattice spot in nickel.

A alien atom replaces a host atom in a material's crystal lattice in a substitutional defect. In this instance, the lattice substitutes a carbon atom for a nickel atom, and the lattice is deformed around the defect location.

The qualities of the material, including its mechanical strength and magnetic properties, can be significantly impacted by this kind of flaw. It's important that carbon can create interstitial defects in nickel by occupying the spaces left by the host atoms in the crystal lattice.

However, because carbon is much smaller than nickel, it has a far lesser chance of occupying an interstitial site than it does a substitutional site.

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The Kw of pure water at 50.0°C with a pH of 6.630 is A) [tex]2.34 * 10^{-7}[/tex]

To determine the Kw of pure water at 50.0°C with a pH of 6.630, follow these steps:

Step 1: Use the pH formula
[tex]pH = -log[H+][/tex], where [H+] is the concentration of hydrogen ions.

Step 2: Solve for [H+]
[tex]6.630 = -log[H+][/tex]
[tex][H+] = 10^{-6.630}[/tex]

Step 3: Use the relationship between Kw, [H+], and [OH-]
[tex]Kw = [H+][OH-],[/tex] where [OH-] is the concentration of hydroxide ions.

Since it's pure water, [H+] = [OH-].

Step 4: Substitute the values into the Kw equation
[tex]Kw = (10^{-6.630})(10^{-6.630})[/tex]

Step 5: Calculate the Kw
[tex]Kw = 2.34 * 10^{-7}[/tex]

The Kw of pure water at 50.0°C with a pH of 6.630 is A) 2.34 × 10^-7.

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b. Water will move from solution B to solution A. Osmosis is the process where water moves across a membrane from an area of lower solute concentration to an area of higher solute concentration.

1. Solution A has a 2% NaCl concentration and solution B has a 1% NaCl concentration.
2. The membrane is permeable to water, which means that water can move through the membrane.
3. Osmosis is the process where water moves across a membrane from an area of lower solute concentration (in this case, NaCl) to an area of higher solute concentration.
4. Since solution A has a higher NaCl concentration (2%) than solution B (1%), water will move from solution B (lower concentration) to solution A (higher concentration) through the membrane.

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The concentration of NOBr using rate law for the decomposition after 3.62 min of reaction is 6.55 x [tex]10^{-10}[/tex] M.

The rate law for the decomposition of NOBr can be expressed as:

rate = k[NOBr]

where k is the rate constant and [NOBr] is the concentration of NOBr.

Using the given rate constant and temperature, k = 5.69 [tex]m^{-1}[/tex] [tex]min^{-1}[/tex] at 293 K.

To find the concentration of NOBr after 3.62 min, we can use the integrated rate law for a first-order reaction:

ln([NOBr]t/[NOBr]0) = -kt

where [NOBr]t is the concentration of NOBr at time t, [NOBr]0 is the initial concentration of NOBr, k is the rate constant, and t is the time elapsed.

Substituting the given values, we get:

ln([NOBr]t/1.86) = -(5.69 [tex]m^{-1}[/tex] [tex]min^{-1}[/tex]) x (3.62 min)

ln([NOBr]t/1.86) = -20.64

Solving for [NOBr]t, we get:

[NOBr]t = 1.86 x [tex]e^{(-20.64)}[/tex]

[NOBr]t = 1.86 x 3.52 x [tex]10^{-10}[/tex]

[NOBr]t = 6.55 x [tex]10^{-10}[/tex] M

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