Help me I don’t understand this Label the chart. Write “Endothermic” or “Exothermic” Reactions look at the chart below please

Answer:

mark me brilliant

To determine the mass of ammonia that can be produced from 40.5 g of N₂, we need to use stoichiometry and the balanced chemical equation provided.

From the balanced equation, we can see that 1 mole of N₂ reacts with 3 moles of H₂ to produce 2 moles of NH₃. Therefore, we need to calculate the number of moles of N₂ in 40.5 g:

Number of moles of N₂ = mass / molar mass = 40.5 g / 28 g/mol = 1.4464 mol N₂

Using the mole ratio from the balanced equation, we can calculate the number of moles of NH₃ produced:

Number of moles of NH₃ = (1.4464 mol N₂) x (2 mol NH₃ / 1 mol N₂) = 2.8928 mol NH₃

Finally, we can use the molar mass of NH₃ to convert the number of moles to mass:

Mass of NH₃ = number of moles x molar mass = 2.8928 mol x 17 g/mol = 49.11 g

Therefore, the mass of ammonia that can be produced from 40.5 g of N₂ with excess H₂ is 49.11 g.

Answer:

Explanation:

The first step is to determine the limiting reactant. In this case, we have 40.5 g of N₂ and excess H₂. We can use the molar mass of each substance to determine the number of moles of each reactant:

N₂: 40.5 g / 28.01 g/mol = 1.45 mol

H₂: 40.5 g / 2.016 g/mol = 20.1 mol

Since we have less moles of N₂ than H₂, N₂ is the limiting reactant. This means that the amount of ammonia produced will be determined by the amount of N₂.

We can use the balanced equation to determine the mass of ammonia produced:

1 mol N₂ → 2 mol NH₃

1.45 mol N₂ → 2.90 mol NH₃

2.90 mol NH₃ * 17.03 g/mol = 50.4 g NH₃

Therefore, 50.4 g of ammonia can be produced from 40.5 g of N₂ with excess H₂.

For the reaction between zinc and hydrochloric acid, we need to know the balanced chemical equation, which is:

[tex]Zn + 2 HCl --- > ZnCl_2 + H_2[/tex]

We can conclude from this equation that when 1 mole of zinc (Zn) is mixed with 2 moles of hydrochloric acid (HCl), 1 mole of zinc chloride (ZnCl2) and 1 mole of hydrogen gas (H2) are produced . The molar mass of zinc is 65.38 g/mol, while the molar mass of zinc chloride is 136.29 g/mol.

We can determine the amount of moles of zinc using the molar mass of zinc and the given mass of zinc:

130.74 g Zn / 65.38 g/mol = 2.000 mol Zn

According to the equation, one mole of zinc reacts to form one mole of zinc chloride. Hence, 2000 moles of ZnCl2 were also produced.

Using the molar mass of ZnCl2, we can finally determine its mass:

2.000 mol ZnCl2 x 136.29 g/mol = 272.58 g ZnCl2

Thus, if 130.74 g of zinc reacts, 272.58 g of zinc chloride will be obtained.

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The percent transmittance of the solution at a wavelength of 460 nm is 29.7%.

The wavelength is the separation between two wave peaks or troughs. It is a fundamental concept in physics and is often used to describe the properties of electromagnetic waves, such as light, radio waves, and X-rays.

The following equation describes the relationship between absorbance and % transmittance:

                                    Absorbance = - log10(Transmittance)

Therefore, you can rewrite the equation as follows to determine a solution's percent transmittance:

Transmittance = 10^(-Absorbance)

At a wavelength of 460 nm, the absorbance value in this instance is 0.518. Consequently, the % transmittance can be determined as follows:

                     Transmittance = 10⁻⁰.⁵¹⁸

                           Transmittance = 0.297

By multiplying by 100, you may express the transmittance as a percentage:

Percent Transmittance = 0.297 x 100

Percent Transmittance = 29.7%

Therefore, the percent transmittance of the solution at a wavelength of 460 nm is 29.7%.

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Answer:

2.1x10^ -5m

Explanation:

this is the final answer

The resulting molarity if 20.0 mL of 3.00 M ammonia solution is diluted to 200 mL is 0.3M (option D).

Molarity is the concentration of a substance in solution, expressed as the number of moles of solute per litre of solution.

The molarity of a diluted solution can be calculated as follows;

CaVa = CbVb

Where;

According to this question, 20.0 mL of 3.00 M ammonia solution is diluted to 200 mL. The resulting molarity can be calculated as follows;

3 × 20 = Cb × 200

60 = 200Cb

Cb = 0.3M

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The delocalization of the positive charge onto the oxygen atom also helps explain why the reaction is regioselective for the para position.

Oxygen is a chemical element with the symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetallic element that readily forms compounds (notably oxides) with almost all other elements. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium.

An element is a substance composed of atoms that have the same number of protons in the atomic nucleus. Elements are characterized by their atomic number, which represents the number of protons in the nucleus. The periodic table of elements is a tabular arrangement of the chemical elements, organized on the basis of their atomic number, electron configurations, and chemical properties.

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Answer:

Acid rain is harmful for forests and other biodiversities. Due to the acid rain in these areas, it can cause the dissolving of nutrients that plants need for growth and to maintain their health, such as magnesium. Acid rain causes aluminium to release into the soil, and that causes trees to have difficulties in taking water. Drastically, it kills the land and marine life, along with insects. Acid rain even has an effect on lakes, rivers and such water bodies get poisoned.

The formula of the compound, given that it contains 30 percent N and 70 percent O by mass is NO₂

First, we shall list out the given parameters from the question. This is given

The formula of the compound can be obtained as illustrated below:

Divide by their molar mass

N = 30 / 14 = 2.14

O = 70 / 16 = 4.375

Divide by the smallest

N = 2.14 / 2.14 = 1

O = 4.375 / 2.14 = 2

Thus, we can conclude from the above calculation that the formula of the compound is NO₂

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The formula of the compound that we have is NO2

We'll start by outlining the parameters that the question has provided. This is stated.

N = 30% in terms of nitrogen percentage.

oxygen percentage (O) = 70%

Compound's formula is =?

The compound's formula can be discovered as shown below:

Based on molar mass;

N = 30 / 14 = 2.14

O = 70 / 16 = 4.375

By the smallest number;

N = 2.14 / 2.14 = 1

O = 4.375 / 2.14 = 2

Thus the formula of the compound that we have to find is NO2.

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The P value denotes the likelihood, for a certain statistical model, that the statistical summary would be equal to or more extreme than the actual observed results if the null hypothesis were true.

When the null hypothesis is assumed to be true, a p-value calculates the likelihood of getting the observed results. The statistical significance of the observed difference is greater the lower the p-value. P-value can be used for hypothesis testing instead of—or in addition to—pre-selected confidence levels.

The computed P value may change depending on a variety of study design factors. These factors include inaccuracy, sample size, and the strength of the link. These components all have the potential to undermine research either singly or collectively.

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Which of the following are true statements about the p-value and hypothesis tests? Select all that apply. Select one or more:

A) The p-value is the probability the null hypothesis is correct.

B) The p-value is the probability the alternative hypothesis is correct.

C) The p-value is 1 - (the probability the alternative hypothesis is correct)

D) If the p-value is large it indicates we did not calculate the test statistic correctly.

E) The p-value is calculated assuming the null hypothesis is true.

F) The p-value is calculated assuming the alternative hypothesis is true.

Answer:

point B

Explanation:

as you may see that's where the two color lines meet and there only

The student needs 2.5 mL of the stock solution and 57.5 mL of water to make 60.0 mL of a 0.05000 M solution of iron(lll).

Solution is defined as a means of solving a problem or dealing with a difficult situation. It is a way to answer a question, handle a difficult task, or address an issue. Solutions can be found in a variety of ways, such as brainstorming, research, trial and error, and seeking the help of an expert. Solutions can be both practical and creative. Finding solutions requires critical thinking, problem solving, and communication skills.

To make 60.0 mL of a 0.05000 M solution of iron(lll) using a stock solution that is 0.2420 M in iron (lll), the student must first calculate the amount of stock solution needed to achieve the desired concentration. This can be done using the equation C1V1=C2V2, where C1 is the concentration of the stock solution (0.2420 M), V1 is the volume of the stock solution needed, C2 is the desired concentration of the final solution (0.05000 M), and V2 is the volume of the final solution (60.0 mL).

Plugging in the values, we get:

0.2420 M x V1 = 0.05000 M x 60.0 mL

V1 = 0.05000 M x 60.0 mL / 0.2420 M

V1 = 2.5 mL

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The volume (in mL) of the 1.041 M NaCl solution needed to obtain 4.93 grams of NaCl is 80.98 mL

First, we shall determine the mole present in 4.93 grams of NaCl. Details below:

Mole = mass / molar mass

Mole of NaCl = 4.93 / 58.5

Mole of NaCl = 0.0843 mole

Finally, we shall determine the volume of NaCl needed. Details below:

Volume = mole / molarity

Volume of NaCl = 0.0843 / 1.041

Volume of NaCl = 0.08098 L

Multiply by 1000 to express in mL

Volume of NaCl = 0.08098 × 1000

Volume of NaCl = 80.98 mL

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Answer:

100

Explanation:

The balanced chemical equation for the combustion of any hydrocarbon in oxygen is:

CₙHₘ + (n + m/4)O₂ → nCO₂ + m/2H₂O

In this case, we don't have a hydrocarbon, but we can assume that the oxygen is reacting with some substance that contains carbon to produce carbon dioxide. Let's assume that the balanced chemical equation for this reaction is:

C + O₂ → CO₂

From the equation, we can see that 1 mole of carbon reacts with 1 mole of oxygen to produce 1 mole of carbon dioxide. The molar mass of oxygen is 32 g/mol and the given mass is 100 g, so we have:

100 g / 32 g/mol = 3.125 mol of oxygen

Since the balanced chemical equation shows that 1 mole of oxygen reacts with 1 mole of carbon dioxide, we can conclude that 3.125 moles of oxygen will produce 3.125 moles of carbon dioxide.

The mole ratio of the CO2 to LiOH is 1:2

The mole ratio is 1:2.

If 1 mole of CO2 reacts with 2 moles of LiOH

x moles of CO2 will react with 12.5 moles of LiOH

x = 6.25 moles

If 2 moles of LiOH produces 1 mole of water

12.5 moles of LiOH will produce 12.5 * 1/2

= 6.25 moles of water

Mole ratio of water to calcium carbide is 2:1

Number of moles of CaC2 = 27 g/64 g/mol

= 0.42 moles

1 mole of CaC2 reacts with 2 moles of H2O

0.42 moles of CaC2 reacts with 0.42 * 2/1

= 0.84 moles

If 1 mole of CaC2 lead to the formation of 1 mole of C2H2

Then 0.42 moles of C2H2 is formed

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The value of Kp at 750 K for the given reaction is 1.09 x [tex]10^{-2}[/tex].

What is Pressure?

Pressure is the force applied per unit area over a surface. It is a scalar quantity and is commonly measured in units such as Pascals (Pa), atmospheres (atm), or pounds per square inch (psi). In gases, pressure is related to the motion of the gas molecules and their collisions with the walls of a container or other surfaces. In liquids and solids, pressure is related to the force applied to the surface and the resistance of the material to deformation.

PHCl = 2.300 bar

PO2 = 2.835 bar - 2.300 bar = 0.535 bar

To solve for the equilibrium partial pressures of Cl2 and H2O, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that 4 moles of HCl react with 1 mole of O2 to produce 2 moles of Cl2 and 2 moles of H2O. Therefore, at equilibrium:

PCl2 = 2x

PH2O = 2x

where x is the amount (in moles) of HCl that has reacted. Initially, there were 4 moles of HCl and 1 mole of O2, so the reaction will proceed until either HCl or O2 is completely consumed.

Let's assume that all of the O2 reacts, which means that 1/4 of the initial amount of HCl will react. Therefore:

x = 1/4 * 4 mol = 1 mol

Now we can calculate the equilibrium partial pressures of Cl2 and H2O:

PCl2 = 2x = 2 mol

PH2O = 2x = 2 mol

Substituting these values into the equilibrium constant expression, we get:

Kp = [tex]2^{2}[/tex]([tex]2^{2}[/tex]) / [tex](2.300)^{4}[/tex](0.535)

Kp = 1.09 x [tex]10^{-2}[/tex]

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The electronic configuration of the chlorine atom can be written as 2, 8 , 7

The positioning of electrons within an atom's or molecule's orbitals is referred to as its electronic configuration. Around the atomic nucleus of an atom, electrons—negatively charged subatomic particles—occupy various energy levels or shells.

The electrons in an atom fill these energy levels or shells in a certain order in accordance with a series of laws known as the Aufbau principle, Pauli exclusion principle, and Hund's rule. Each energy level or shell has a maximum capacity for electrons.

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The heat released is 439.5 J during the reaction.

The heat released can be calculated using the formula:

where q is the heat released, m is the mass of the solution, C is the specific heat of water, and ΔT is the change in temperature.

First, we need to calculate the total mass of the solution:

The density of water is 1 g/mL, so the mass of the solution is 35 g.

Next, we can calculate the change in temperature:

Finally, we can substitute these values into the formula:

Therefore, 439.5 J of heat was released during the reaction.

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The electrode potential of the cell that we have here is 2.85 V

Redox potential, electrode potential, and reduction potential are all terms used to describe the ability of a chemical species to gain electrons and proceed through reduction. The potential difference between an electrode in a half-reaction and a common reference electrode, typically the hydrogen electrode, is expressed in volts (V).

A species has a stronger tendency to be reduced and gain electrons the more positive the reduction potential. The direction and viability of a redox reaction can be predicted using the reduction potential.

The reduction potential of beryllium is -1.99 V

The reduction potential for Hg is +0.86 V

The Ecell = 0.86 - (-1.99)

= 2.85 V

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In a basic solution, the balanced redox reaction is:

[tex]2SO3_2- + 4H_2O + 2Ag -- > 2SO4_2- + 8OH- + 2Ag[/tex]

Step 1- half-reactions for the oxidation and reduction:

Oxidation: SO32- → SO42- + e-

Reduction: Ag+ + e- → Ag

Step-2- Balance the number of electrons transferred in the two half-reactions by multiplying the oxidation half-reaction by

[tex]2SO3_2- --- > 2SO4_2- + 2e-\\Ag+ + e--- > Ag[/tex]

Step-3-  balance the oxygen atoms by adding water molecules to the half-reactions;

[tex]2SO3_2- + 2H_2O--- > 2SO4_2- + 4H+ + 2e-\\Ag+ + e- -- > Ag[/tex]

step 4-  balance the hydrogen atoms by adding hydroxide ions to the half-reaction that needs it (in this case, the oxidation half-reaction);

2SO32- + 4H2O → 2SO42- + 8OH- + 2e-

Ag+ + e- → Ag

Step-5 multiply the reduction half-reaction by 2 and add

[tex]2SO3_2- + 4H_2O ----- > 2SO4_2- + 8OH- + 2e-\\2Ag+ + 2e- ---- > 2Ag\\2SO3_2- + 4H_2O + 2Ag+ ---- > 2SO4_2- + 8OH- + 2Ag[/tex]

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1. The temperature, given that you have 4 moles of the gas at a pressure of 5.6 atm is -68.4 °C

2. The number of mole of the gas you have, given that the pressure is 1.20 atm is 1.26 mole

The temperature of the gas can be obtain as follow:

PV = nRT

Inputting the given parameters, we can obtain the temperature of the gas as follow:

5.6 × 12 = 4 × 0.0821 × T

67.2 = 0.3284 × T

Divide both sides by 0.3284

T = 67.2 / 0.3284

T = 204.6 K

Subtract 273 to obtain answer in °C

T = 204.6 - 273 K

T = -68.4 °C

Thus, the temperature is -68.4 °C

We shall begin by listing out the given parameters from the question. This is shown below:

Ideal gas equation is written as follow:

PV = nRT

Inputting the given parameters, we can obtain the number of mole of the gas as follow:

1.2 × 31 = n × 0.0821 × 360

Divide both sides by (0.0821 × 360)

n = (1.2 × 31) / (0.0821 × 360)

n = 1.26 mole

Thus, we can conclude that the number of mole of the gas is 1.26 mole

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Complete question:

See attached photo

For the chemical elements Cl, Am, Lu, Ca, Hg, I, Ti, and Mg, the final occupied sublevels are the 4s orbital for Cl, the 5f orbital for Am, the 7s orbital for Lu, the 3p orbital for Ca, the 6s orbital for Hg, the 5p orbital for I, the 4f orbital for Ti, and the 3s orbital for Mg.

The primary quantum number, n, of an element determines the sublevel of that element. greater numbers correspond to greater energy levels for the electron, which is indicated by this number.

The form of the orbital is determined by the angular momentum quantum number, l. The p orbital has a form, the d orbital has a clover shape, the f orbital is complicated, and the s orbital is spherical. the final level that was inhabited.

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Observations:

The addition of sodium hydroxide to each test tube results in the formation of iron hydroxide precipitates. In the case of the Fe²⁺ test tube, the iron(II) ions react with the hydroxide ions to form a brownish-green precipitate of iron(II) hydroxide.

In the Fe³⁺ test tube, the iron(III) ions react with the hydroxide ions to form a reddish-brown precipitate of iron(III) hydroxide. These observations confirm that both Fe²⁺ and Fe³⁺ ions are present in the original samples and provide evidence of a chemical reaction taking place.

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The correct answer is that Q is a weaker acid than P

Due to the fact that stronger acids have a tendency to react with metals like magnesium more quickly, acid P is probably stronger than acid Q.

In comparison to acid Q, acid P would produce more hydrogen gas in a smaller amount of time due to its higher reaction rate.

Statement C, however,  is true that acid Q is a weaker acid than acid P, which would also contribute to the slower reaction rate and smaller volume of hydrogen gas produced.

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The reaction quotient for this mixture of the two gases in which [ NO₂ ] = 0.0212 M and [ N₂O₄ ] = 0.00553 M is 0.130.

The reaction quotient Qc can be calculated using the law of mass action, which is the same expression as the equilibrium constant but with concentrations at any point in the reaction:

Qc = [N₂ O₂] / [NO₂]²

Substituting the given concentrations from the mixtures:

Qc = ( 0.00553 ) / ( 0.0212 )²

Qc = 0.130

So the reaction quotient for this mixture is 0.130.

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False. According to the given data, the solubility of BaSO₄ decreases as temperature increases.

Solubility refers to the maximum amount of a substance that can dissolve in a given amount of solvent under specific conditions of temperature, pressure, etc to form a homogeneous solution.

It is usually expressed in units of mass per unit volume of solvent, such as grams per liter (g/L) or moles per liter (mol/L).

For this question, at 20°C, the solubility is 2.4 x 10⁻³ g/L, at 25°C it is 2.6 x 10⁻³ g/L, and at 30°C it is 2.9 x 10⁻³ g/L.

This indicates that as the temperature increases, the solubility of BaSO₄ decreases, which is the opposite of becoming more soluble. Therefore, the correct statement is False.

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For all three cases, we can use the fact that pH + pOH = 14 to find pOH, and then use pOH to calculate [OH−] and [H3O+].

Case 1: pH = 8.76

pOH = 14 - pH = 14 - 8.76 = 5.24

[OH−] = 10^(-pOH) = 10^(-5.24) = 5.2 × 10^(-6) M

[H3O+] = 1 × 10^(-14) / [OH−] = 1 × 10^(-14) / (5.2 × 10^(-6)) = 1.9 × 10^(-9) M

Therefore, [H3O+] = 1.9 × 10^(-9) M and [OH−] = 5.2 × 10^(-6) M.

Case 2: pH = 11.32

pOH = 14 - pH = 14 - 11.32 = 2.68

[OH−] = 10^(-pOH) = 10^(-2.68) = 2.1 × 10^(-3) M

[H3O+] = 1 × 10^(-14) / [OH−] = 1 × 10^(-14) / (2.1 × 10^(-3)) = 4.8 × 10^(-12) M

Therefore, [H3O+] = 4.8 × 10^(-12) M and [OH−] = 2.1 × 10^(-3) M.

Case 3: pH = 2.80

pOH = 14 - pH = 14 - 2.80 = 11.20

[OH−] = 10^(-pOH) = 10^(-11.20) = 6.3 × 10^(-12) M

[H3O+] = 1 × 10^(-14) / [OH−] = 1 × 10^(-14) / (6.3 × 10^(-12)) = 1.6 × 10^(-3) M

Therefore, [H3O+] = 1.6 × 10^(-3) M and [OH−] = 6.3 × 10^(-12) M.

Answer:

The correct answer to your question is 4.54 mols.

Answer:

Explanation:

Ultraviolet rays are the major cause of sunspots, solar flares and coronal mass ejections

The given statement " The reaction 2NaOH(s) —> Na₂O(s) + H₂O(g) is a combustion reaction is false as it is the decomposition reaction.

The decomposition reaction can be explained as the chemical reaction in which the one reactant will breaks down into the two or the more products. The Decomposition reaction is the processes in the reaction the chemical species will break into the simpler parts. the, decomposition reactions require the energy input.

The general representation of the equation of the decomposition reaction is as :

AB → A + B.

The chemical equation is :

2NaOH(s) —> Na₂O(s) + H₂O(g)

This is called as the decomposition reaction.

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We need to weigh 15.27 g of [tex]BaCl_{2}.2H_{2}O[/tex] and dissolve it in water to make a 0.25M Cl solution in 250ml.

To prepare 0.25M Cl in 250ml from [tex]BaCl_{2}.2H_{2}O[/tex] we first need to calculate the required amount of [tex]BaCl_{2}.2H_{2}O[/tex].

The molecular weight of [tex]BaCl_{2}.2H_{2}O[/tex] is 244.26 g/mol.

The equation for the dissociation of [tex]BaCl_{2}[/tex] in water is:

[tex]BaCl_{2}[/tex](s) → [tex]Ba^{2+}[/tex] (aq) + 2Cl- (aq)

To make 250 ml of 0.25M Cl solution, we need to calculate the amount of[tex]BaCl_{2}.2H_{2}O[/tex]required to produce 0.25 moles of Cl.

0.25 moles Cl × 1 mole [tex]BaCl_{2}[/tex]/ 2 moles Cl × 244.26 g/mol [tex]BaCl_{2}[/tex]= 15.27 g [tex]BaCl_{2}.2H_{2}O[/tex]

Therefore, we need to weigh 15.27 g of [tex]BaCl_{2}.2H_{2}O[/tex] and dissolve it in water to make a 0.25M Cl solution in 250ml.

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