Think about how you would expect the temperatures in the star to vary between each of the layers shown, and use this to sort the following elements in order of increasing temperature at which they burn in a nuclear fusion reaction.
Helium - Carbon - Oxygen - Hydrogen - Neon - Sulfur

The density of the gas at 84° C and 721 mm Hg will be 2.50 g/L.

The density of a gas can be calculated using the following formula:

Density = (Pressure x Molar Mass) / (Gas Constant x Temperature)

Where, Density is the density of the gas in grams per liter. Pressure is the pressure of the gas in millimeters of mercury (mm Hg). Molar mass is the molar mass of the gas in grams per mole. Gas constant is the universal gas constant (0.08206 L atm / mole K). Temperature is the temperature of the gas in kelvin (K).

Now, let's find the density of the gas at 34° C and 745 mm Hg. The temperature should be converted from Celsius to Kelvin. Temperature (K) = 34 + 273 = 307 K

Density = (Pressure x Molar Mass) / (Gas Constant x Temperature)

Density = (745 x Molar Mass) / (0.08206 x 307)

Density = 28.91 x Molar Mass g/L

Also, we need to find the molar mass of the gas. Since we don't know which gas it is, we'll use the formula,

Molar Mass = Density x (Gas Constant x Temperature) / Pressure

Molar Mass = 1.87 x (0.08206 x 307) / 745

Molar Mass = 0.103 g/mol

Now, we can find the density of the gas at 84° C and 721 mm Hg.

Temperature (K) = 84 + 273 = 357 K

Density = (Pressure x Molar Mass) / (Gas Constant x Temperature)

Density = (721 x 0.103) / (0.08206 x 357)

Density = 2.50 g/L

Therefore, the density of the gas at 84° C and 721 mm Hg will be 2.50 g/L.

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The correct answer for Acid dissociation constant of alloxanic acid is 1.09 × 10⁻.

The formula for alloxanic acid is HC4H3N2O5. Its pH, when it is in a 0.74 M solution, is 3.39.

We need to determine the acid dissociation constant of alloxanic acid. We can use the following formula for this purpose:

Ka = [H+][A-] / [HA]   Where [H+] is the concentration of hydrogen ions, [A-] is the concentration of the conjugate base, and [HA] is the concentration of the acid.

We need to find out the concentration of hydrogen ions and the concentration of the acid. The pH of a solution is equal to the negative log of the hydrogen ion concentration.

We can use this formula to determine the concentration of hydrogen ions: pH = -log[H+] We can rearrange this equation to get [H+]: [H+] = 10-pH.

The concentration of hydrogen ions is: [H+] = 10-3.39 = 4.45 × 10⁻⁴M The concentration of the acid is 0.74 M. The concentration of the conjugate base can be determined by the following formula: [A-] = [H+] × (Ka / [HA]).

We can rearrange this equation to get Ka: Ka = ([H+] × [HA]) / [A-]

Substituting the values, we get: [A-] = [H+] × (Ka / [HA]) [A-] = (4.45 × 10-4) × (Ka / 0.74) [A-] = 3.01 × 10⁻⁶Ka

We can substitute this value of [A-] in the above formula for Ka:Ka = ([H+] × [HA]) / [A-]Ka = (4.45 × 10⁻⁴) × 0.74 / 3.01 × 10⁻⁶Ka = 1.09 × 10⁻⁵.

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The reaction of hydrogen gas and oxygen gas to produce water is an exothermic reaction because more energy is released in the formation of the products than is needed to break the bonds of the reactants.

In other words, more energy is released when the hydrogen and oxygen molecules combine to form water molecules than is needed to break the bonds between the hydrogen and oxygen molecules.

Exothermic reaction- It is a type of reaction in which the two atoms react with each other to form a stable compound and release energy in the process of doing so.

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Absorbance is the measure of how much light is absorbed by a sample solution at a particular wavelength. The Beer-Lambert law states that there is a linear relationship between the absorbance of a solution and its concentration.

Specifically, absorbance is directly proportional to the concentration and path length of the sample solution, and inversely proportional to the intensity of the incident light. This relationship can be expressed mathematically as A = ɛcl, where A is the absorbance, ɛ is the molar absorptivity (a constant unique to each substance), c is the concentration of the solution in mol/L, and l is the path length of the sample cell in cm.

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In each of the following situations, the intensity of the interaction differs for charged particles.

a. The distance between the charges increases. (decreases)

b. The size of the charge decreases. (increases)

a. The strength of the interaction between charged particles decreases as the distance between them increases. This is because the force between charged particles follows an inverse square law, which means that the force decreases with the square of the distance between the charges. Therefore, as the distance between the charges increases, the force between them decreases and the strength of the interaction decreases.

b. The strength of the interaction between charged particles increases as the size of the charge decreases. This is because the force between charged particles is directly proportional to the magnitude of the charge. Therefore, as the size of the charge decreases the force between the charged particles decreases and the strength of the interaction decreases.

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Answer: -230 N

Explanation:

The electrical force between two point charges q1 and q2 separated by a distance r is given by Coulomb's law:

F = k * (q1 * q2) / r^2

where k is the Coulomb constant, q1 and q2 are the magnitudes of the charges, and r is the distance between them.

In this case, we have a positive charge and a negative charge, which means that q1 and q2 have opposite signs. Let's assume that the positive charge has a magnitude of q and the negative charge has a magnitude of -q. Then, the electrical force between them can be calculated as:

F = k * (q * (-q)) / r^2 = -k * q^2 / r^2

Substituting the given values of e and k, we get:

F = - (8.99 × 10^9 N m^2/C^2) * (1.6 × 10^-19 C)^2 / (10^-15 m)^2 ≈ -230 N

Note that the negative sign indicates that the force is attractive, which is expected for opposite charges. Therefore, the correct answer is:

-230 N.

The equilibrium shift when the concentration of H2 (gas) is increased by adding more hydrogen gas to the container at constant temperature is towards the right side of the reaction equation.

Let us understand how the reaction shifts with the help of the following chemical reaction equation. N2(g) + 3H2(g) ⇌ 2NH3(g).

Adding more H2 gas to the container at constant temperature will increase the concentration of H2 gas.

The reaction will shift towards the product side (right side of the reaction equation) to balance the reaction equation.

The concentration of NH3 gas will increase, and the concentration of N2 gas and H2 gas will decrease.

The reaction quotient (Qc) is used to predict the direction of the reaction.

If Qc is greater than Kc, the reaction shifts towards the left side of the reaction equation.

If Qc is less than Kc, the reaction shifts towards the right side of the reaction equation.

.f Qc is equal to Kc, the reaction is at equilibrium state with no shift in the reaction.

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The groups present on a benzene ring can impact the success and regioselectivity of an electrophilic aromatic substitution

. The activation and directing effects of various groups present on a benzene ring are as follows: Moderately deactivating meta- director: Nitro (-NO2), Sulfonyl (-SO3H)Strongly activating ortho-/para- director: Amino (-NH2), Hydroxyl (-OH), Alkoxy (-OR), Aryl (-Ar), Alkyl (-R), Dialkylamino (-N (R) 2), Carboxyl (-COOH)Weakly activating ortho-/para- director: Chloro (-Cl), Bromo (-Br), Iodo (-I)Strongly deactivating meta- director: Carbonyl (-C (O) R), Cyano (-CN)Weakly deactivating ortho-/para- director: Methyl (-CH3), Ethyl (-C2H5), Phenyl (-C6H5)Therefore, the groups that best fit each activation and directing description are as follows: Moderately deactivating meta- director: Nitro (-NO2)Strongly activating ortho-/para- director: Amino (-NH2)Weakly activating ortho-/para- director: Chloro (-Cl)Strongly deactivating meta- director: Carbonyl (-C (O) R)Weakly deactivating ortho-/para- director: Methyl (-CH3)

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The extrinsic pathway of coagulation is initiated by the exposed endothelial collagen. Endothelial cells are cells that line the interior surface of blood vessels, forming a barrier between the blood and the underlying tissues. Collagen is a protein that is an important component of the extracellular matrix that supports and strengthens tissues throughout the body.

The interaction of tissue factor with factor VIIa (the activated form of factor VII) triggers a series of reactions that ultimately lead to the activation of factor X and the formation of a blood clot. This process involves the formation of a complex known as the extrinsic tenase complex, which includes tissue factor, factor VIIa, calcium ions, and phospholipids. The extrinsic tenase complex activates factor X, which then leads to the activation of thrombin and the subsequent formation of fibrin, the protein that forms the basis of a blood clot.

The extrinsic pathway is called the "extrinsic" pathway because it is initiated by factors that are external to the blood itself, namely tissue factor. In contrast, the intrinsic pathway of coagulation is initiated by factors that are present within the blood itself, such as platelets and activated factor XII.

Overall, the extrinsic pathway of coagulation is an important component of the body's response to tissue injury, and it plays a critical role in preventing excessive bleeding and promoting wound healing.

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Answer:

Diborane, B2H6, is a useful reagent in organic chemistry. One of the several ways it can be prepared is by the following reaction 2 NaBH4(aq) H2SO4(aq) 2 H2 (g) + Na2SO4(aq) + B2H6(g) What volume of 0.0915 M H2SO4, in milliliters, should be used to consume completely 1.35 g of NaBH4? mL 200 What mass of B2H6 can be obtained? 0.51

Explanation:

hope its help

Root mean square (RMS) average speed of the atoms in a sample of neon gas at 0.17atm and −52.°C is 2.233 × 10⁻⁴m/s.

The root mean square (rms) average speed of the atoms in a sample of neon gas at 0.17atm and −52.°C can be calculated as follows:

Given data:  Pressure, P = 0.17atm              Temperature, T = -52°C = 221 K

Atomic weight of Neon, m = 20.18 g/mol = 20.18 × 10^-3 kg/molR = 8.314 J/mol KKB = R/NA = 1.38 × 10^-23 J/K (Boltzmann constant).

The root mean square (rms) velocity of gas is given by the equation:rms velocity, vrms = [3KB T/m]^1/2where, m = molar mass of gas, T = temperature, and KB = Boltzmann constant.

Substituting the given data, we get:v(rms) = [3KB T/m]^(1/2)v(rms) = [3KB T/m]^(1/2)v(rms) = [3 × (1.38 × 10^-23 J/K) × 221 K / (20.18 × 10^-3 kg/mol)]^(1/2)v(rms) = [4.981 × 10^-20 m^2/s^2]^(1/2) = 2.233 × 10⁻⁴ m/s.

Therefore, the RMS average speed of the atoms in a sample of neon gas at 0.17atm and −52.°C is 2.233 × 10⁻⁴ m/s (rounded off to 3 significant digits).

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The type of mixture whose components are evenly distributed throughout is a homogeneous mixture.

A homogeneous mixture is a mixture in which the components are uniformly distributed throughout. The mixture appears to be the same throughout, and it has the same physical and chemical properties throughout. The composition of the components of a homogeneous mixture is uniform. An example of a homogeneous mixture is a solution of sugar and water. Sugar dissolves in water to form a homogeneous mixture. Another example is salt and water. Salt dissolves in water to form a homogeneous mixture.

However, These are the kinds of combinations where the ingredients are evenly dispersed throughout. In other words, "they are consistent throughout. In a homogenous mixture, we can only see one phase of the substance and components are evenly distributed throughout .

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To help the crystals form, these three options are correct- 1. Scrape the inside of the Erlenmeyer flask with a glass rod below the surface of the solvent. 2. Add a scrap of paper to nucleate the crystals. 3. Add some crystals of the compound you are trying to crystallize.

Crystallization is the process of a solid material forming a structured arrangement of its particles, typically resulting in a highly ordered and often repeating pattern. This can be seen in the formation of solid crystals such as salt, sugar, and diamonds. Crystallization occurs when molecules of the solid tend to organize themselves into a more ordered pattern.

Adding a scrap of paper to nucleate the crystals is a process known as seeding. Seeding involves introducing a small crystal into a container of supersaturated solution, which then provides a nucleus for additional crystals to form around. This process accelerates the growth of the crystals and can be used to create larger, more consistent crystals. It can also be used to create crystals with specific shapes and sizes. The addition of a scrap of paper encourages the solution to form around it, helping to encourage the formation of crystals.

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When a scientist carefully examines any quantities repeatedly, they actually expect that all but one measurement will be the same. The correct option is C.

Measurement error is the difference between the value obtained by the observer and the true value of the quantity being measured. When scientists take measurements, they try to reduce errors as much as possible so that they can have a more precise value. Measurement error is divided into two categories: systematic errors and random errors.

In any situation, scientists and researchers want to ensure that their measurements are as accurate as possible. As a result, when taking measurements, they will repeat the measurements multiple times to obtain the most precise data possible. In such a situation, a scientist will expect that all but one measurement will be the same. They will then take the average of the multiple measurements taken, which is more accurate than taking a single measurement. This technique reduces the likelihood of systematic errors, which can arise due to environmental factors, instrument errors, or personal errors.

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Al(NO3)3 solution concentration and the concentration of H3O+ ions in the solution following the addition of HNO3 are given in the problem. We can determine the presence of [Al(H2O)5(OH)2+] in the solution using this knowledge along with the known equilibria for the hydrolysis of Al3+.

For Al3+, the hydrolysis process may be expressed as follows:

Al(H2O)63+ + water becomes Al(H2O)5(OH)2+ + H3O+.

The reaction's equilibrium constant expression is as follows:

Al(H2O)5(OH)2+) = K

Al(H2O)63+ / [H3O+]

We must take into account the dissociation of Al(NO3)3 in water in order to determine [Al(H2O)5(OH)2+] in a 0.15 M solution of Al(NO3)3:

Al3+ (aq) + 3NO3- Al(NO3)3 (s) (aq)

Al3+ has a concentration of 0.45 M (3 times that of the Al(NO3)3 solution) in an Al(NO3)3 solution with a concentration of 0.15 M. H3O+ is present in the solution at a concentration of 0.10 M.

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You need to know the hydronium ion concentration in moles per litre to determine the pH of the an aqueous solution (molarity). The equation pH Equals - log [H3O+] is then used to determine the pH.

An universal indicator is indeed a pH indicator made of the a solution of many compounds which exhibits several continuous colour changes more than a wide range pH levels to indicate the alkaline or acidic nature of solutions.

There are two ways to measure pH: colorimetrically with indicator fluids or sheets and electrochemically with electrodes as well as a millivoltmeter for greater accuracy (pH meter).

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320.45 grams of hydrazine are needed to produce 10.0 mol of nitrogen gas.

What is Hydrazine?

It is a colorless, flammable, and highly toxic liquid with an ammonia-like odor. Hydrazine is used in a variety of industrial applications, including as a rocket propellant, polymerization catalyst, and in the production of pesticides, pharmaceuticals, and other chemicals.

a. The balanced chemical equation for the reaction between hydrazine and hydrogen peroxide is:

N2H4 (l) + H2O2 (l) → N2 (g) + 2H2O (l)

b. To determine the amount of hydrazine required to produce 10.0 mol of nitrogen gas, we can use stoichiometry and the balanced chemical equation.

From the equation, we can see that 1 mole of N2 is produced for every mole of N2H4 consumed. Therefore, the amount of N2H4 required can be calculated as:

10.0 mol N2H4 / 1 mol N2 = 10.0 mol N2H4

To convert from moles of N2H4 to grams, we need to use the molar mass of N2H4, which is 32.045 g/mol. Therefore, the mass of N2H4 required can be calculated as:

10.0 mol N2H4 x 32.045 g/mol = 320.45 g

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Answer:

Magnetized objects move in the direction that reduces their magnetic potential energy. This is no different than the skate park.

Explanation:

The actual absolute zero temperature in degrees Celsius is 273.15.

Experimental Value of Absolute Zero for Sample 1: -283.6°C

Percent Error for Sample 1: |(-283.6 - (-273.15)) / (-273.15)| x 100 = 3.8%

Experimental Value of Absolute Zero for Sample 2: -288.7°C

Percent Error for Sample 2: |(-288.7 - (-273.15)) / (-273.15)| x 100 = 5.7%

Using Sample 1:

P = 1.2 atm

V = 22.0 mL

n = (P * V) / (R * T)

n = (1.2 * 0.0220) / (0.0821 * (12+273))

n = 0.00075 mol

Using Sample 2:

P = 1.2 atm

V = 20.0 mL

n = (P * V) / (R * T)

n = (1.2 * 0.0200) / (0.0821 * (12+273))

n = 0.00069 mol

Conclusion:

The experimental absolute zero value for Sample 1 was -283.6°C with a percent error of 3.8% and for Sample 2 was -288.7°C with a percent error of 5.7%. The experimental absolute zero values were close to the accepted value of -273.15°C, with Sample 1 being closer than Sample 2. Therefore, the data supports the hypothesis that the relationship between volume and temperature of an ideal gas can be used to determine absolute zero.

Possible sources of error that could have impacted the results of this lab include experimental error in measuring the volume and temperature, as well as deviations from ideal gas behavior due to factors such as intermolecular forces.

The investigation can be explored further by testing the effects of changes in pressure and number of moles on the relationship between volume and temperature in ideal gases.

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No, an electroscope cannot measure quantitative charges because it only indicates the presence or absence of charge.

An electroscope is a straightforward tool used to find electrical charges. Based on the idea that like charges repel one another, it causes an object, such as a leaf or a needle, to move away from another that is charged. An electroscope, however, cannot reveal the magnitude or size of the charge that is present.

A more advanced instrument, like an electrometer, which is capable of measuring small electric charges with a high degree of accuracy, would be required to measure quantitative charges. The output of detectors like Geiger counters and particle detectors, as well as static charges, are frequently measured using electrometers in scientific research and engineering applications.

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The complete question is-

Can an electroscope measure quantitative charges?

D. Running water at 135 F (57 C) or lower, or a container of water at 135 F (57 C) or lower.

Phytoremediation is a cost-effective and environmentally friendly method of reducing pollutant concentrations and restoring contaminated ecosystems.

What is Pollutants?

Pollutants are substances or agents that contaminate the environment and have harmful effects on living organisms, natural resources, or the climate. Pollutants can be released into the air, water, or soil from natural sources or human activities such as industrial processes, transportation, agriculture, and waste disposal. Some common examples of pollutants include greenhouse gases, particulate matter, ozone, nitrogen oxides, sulfur dioxide, lead, mercury, pesticides, and plastic waste.

The method of using cattails in swamps to absorb chemical pollutants is called phytoremediation. Phytoremediation is a type of bioremediation that uses plants to remove, detoxify, or sequester contaminants from soil, water, or air. In this process, plants absorb contaminants through their roots or take them up from the air and store them in their tissues or metabolize them into less harmful forms. Cattails are particularly effective at removing organic pollutants such as pesticides, herbicides, and petroleum products, as well as heavy metals like lead, cadmium, and arsenic.

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Ion channels that open and close in response to a change in membrane potential are called voltage-gated ion channels.

Voltage-gated ion channels are a specialized type of membrane protein that are embedded in the lipid bilayer of excitable cells. They have a pore that allows ions to flow through, and they can be selective for different types of ions, such as sodium (Na+), potassium (K+), or calcium (Ca2+).

The opening and closing of the channel's pore is controlled by changes in the membrane potential, which is the difference in electrical charge across the cell membrane.

These channels are crucial for the generation and propagation of electrical signals in excitable cells, such as neurons and muscle cells. Voltage-gated ion channels are capable of detecting small changes in membrane potential and responding by opening or closing their pore, allowing ions to flow across the membrane and alter the electrical state of the cell.

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The ionic salt that contains a CO₄ ion would produce a neutral solution. Hence, option C is correct.

Salts are ionic compounds that completely disintegrate into ions when they are dissolved in water. They are created when acids and bases react, and they are always made up of either metal cations or cations made from ammonium (NH₄⁺).

The pH of a salt depends on the basicity or acidity of its anion and cation. The salt of a strong acid and a strong base creates a neutral solution because it does not create any H+ or OH-. Likewise, if the salt comes from a weak acid and a strong base, the resulting solution will be basic because the conjugate base of a weak acid is a strong base.

Therefore, the given ionic salt with a CO₄ ion is neutral.

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The pH of the given solution has to be calculated when titrating 50.0 ml of 0.220 M HClO (aq) with 0.220 M KOH (aq) before the addition of any KOH will be 13.34.

To determine the pH of solution, we need to first determine the ionization constant of HClO (aq).

Ka = [H₃O⁺] [ClO⁻]/[HClO]

Let's write down the acid dissociation reaction of HClO (aq).

HClO (aq) + H₂O (l) → H₃O⁺(aq) + ClO⁻(aq) (Ka = 3.5 times 10⁻⁸)

Initial concentration: [HClO] = 0.220m

[H₃O⁺] = x

[ClO⁻] = x

At equilibrium, Ka = (x)(x)/(0.220 - x)

3.5 times 10⁻⁸ = x²/(0.220 - x)

Since the concentration of x in denominator is much smaller than the initial concentration, we can consider that as 0.220

0.220 - x.x = 4.69 times 10⁻⁴m

The concentration of H⁺ ions is equal to the concentration of H₃O⁺ ions. Thus, [x]small

[H₃O⁺] = 4.69 times 10⁻⁴m

pH = -log [H₃O⁺] = -log (4.69 times 10⁻⁴) = 3.33

The pH of the solution before adding any KOH is 3.33. Calculate pH after each addition of KOH. After adding 50.0 ml of 0.220 M KOH (aq), the concentration of HClO (aq) will become zero. We will have KOH (aq) remaining in the solution. Thus, we will have to calculate the pH of a strong base. The stoichiometry of the reaction will be 1:1 because both HClO (aq) and KOH (aq) are monoprotic acids and bases respectively. We have to calculate the number of moles of KOH (aq) added. The number of moles of KOH (aq) will be,

n = MV

Where, M is the molarity of KOH (aq) and V is the volume of KOH (aq) added. n = (0.220m) (50.0ml/1000) = 0.011mol

The amount of KOH (aq) is equal to the amount of OH⁻ ions.

[OH⁻] = 0.011mol (0.050L) = 0.22M

pOH = - log [OH⁻] = - log (0.22) = 0.6575

pH = 14 - pOH = 14 - 0.6575 = 13.34

The pH of the solution is 13.34.

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The process of distillation involves heating the alcohol-containing solution, gathering the vapours, and then condensing them back into liquid form.

According to their boiling points, liquids are separated and purified using the distillation process. When it comes to alcohol, the solution is heated until the alcohol evaporates into a vapour, which is then collected and condensed back into a liquid state. A highly concentrated alcohol solution is produced as a result of this procedure, which enables the separation of the alcohol from other elements in the solution.

Alcoholic drinks including whisky, vodka, gin, and rum are made by distillation.

In the chemical industry, distillation is used to separate and purify various compounds and solvents.

In the process of refining petroleum, distillation is used to separate crude oil into several products, including gasoline, diesel, and kerosene.

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Answer:

   Fatty acids

   Steroids

   Glycolipids

   Triacylglycerols

   Sphingolipids

   Phospholipids

(i).The mass of ammonia produced is 2.43 x 10^3 g. (ii) The 71.4 moles of dinitrogen react with 214.2 moles of dihydrogen to produce 142.8 moles of ammonia. (iii) Mass of ammonia produced in given reaction with 1 gram of dinitrogen and 3 grams of dihydrogen is 1.22 g.

Using the given masses of dinitrogen and dihydrogen, we can calculate moles of each:

dinitrogen = mass/molar mass = 2.00 x 10^3 g/28 g/mol = 71.4 mol,

dihydrogen = mass/molar mass = 1.00 x 10^3 g/2 g/mol = 500 mol

The mass of ammonia produced can be calculated as:

[tex]Mass of ammonia = moles * molar mass = 142.8 mol * 17 g/mol = 2.43 * 10^{3 }g[/tex]

Therefore, the mass of ammonia produced is 2.43 x 10^3 g.

We can calculate the mass of ammonia produced using the equation:

[tex]mass = number of moles * molar mass = 2 * 0.0356 * 17.03 = 1.22 g[/tex]

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