why did the apollo capsules not use a nitrogen/oxygen mixture for air, which is less flammable than a pure oxygen mixture?

The equator of the sun rotates faster than the poles.

The equator of the sun rotates faster than its poles. This is known as differential rotation, and it is due to the fact that the sun is not a solid body, but is composed of gas and plasma. The equatorial regions of the sun rotate faster because they are farther from the center of the sun, where the gravitational pull is stronger, and thus experience less resistance to their motion.

The period of rotation of the equator of the sun is shorter than that of the poles. The equator rotates once every 25.4 days, while the poles rotate once every 36 days.

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Answer:

a.) Instead of configuring all up before some down, all of the configurations were placed as up and down, leaving two spots empty in the 2p sublevel.

b.) There is a missing s sublevel for row 3.

c.) There are two up arrows in one of the lines.

d.) When you get to the "d" section you must subtract the number you're using by 1. So, it's supposed to be 2d to the power of 10.

The correct statement is: the most probable molecular speed decreases as the molar mass of the gas increases. The relationship observed between the most probable molecular speed and the molar mass of the gas is that the most probable molecular speed decreases as the molar mass of the gas increases. This is because heavier molecules have more inertia and therefore move more slowly than lighter molecules. So, the larger the molar mass, the slower the molecular speed.

This relationship can be explained by the equation for the most probable molecular speed (V_p), which is derived from the Maxwell-Boltzmann distribution:

V_p = √(2 * R * T / M)

where:
- V_p is the most probable molecular speed
- R is the ideal gas constant
- T is the temperature in Kelvin
- M is the molar mass of the gas

As you can see from the equation, the most probable molecular speed (V_p) is inversely proportional to the square root of the molar mass (M). This means that when the molar mass increases, the most probable molecular speed decreases, and vice versa.

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The relationship observed between the most probable molecular speed and the molar mass of the gas is the most probable molecular speed decreases as the molar mass of the gas increases.

This relationship can be explained by the following steps:
1. Molecular speed refers to the velocity of individual molecules in a gas sample.
2. Molar mass is the mass of one mole of a substance, usually expressed in grams per mole (g/mol).
3. The most probable molecular speed can be estimated using the Maxwell-Boltzmann distribution, which describes the distribution of molecular speeds in a gas.
4. According to this distribution, lighter molecules (with lower molar mass) tend to have higher molecular speeds than heavier molecules (with higher molar mass) at the same temperature.
5. Therefore, as the molar mass of a gas increases, the most probable molecular speed decreases.

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The lambda max (λmax) of an azo color is the wavelength at which the color retains light most unequivocally.

It is decided by the electronic structure of the color atom, which in turn depends on the nature and position of the chromophores and auxochromes within the atom.

A chromophore could be a gathering of iotas in an atom that retains light due to the nearness of delocalized π electrons.

An autochrome may be a gathering of molecules in an atom that changes the electronic properties of the chromophore and impacts the absorption spectrum of the particle.

In azo dyes, the chromophore is the azo gather (-N=N-), which incorporates a tall molar termination coefficient and assimilates emphatically within the unmistakable locale of the electromagnetic range.

The auxochromes are ordinarily fragrant rings, amino bunches, or carboxylic corrosive bunches, which can give or pull back electrons from the chromophore and move the λmax of the color.

When a coupling reagent is included in an azo color response, it responds with a diazonium salt to make an unused azo color. The structure of the coupling reagent can influence the λmax of the coming about color by modifying the electronic properties of the chromophore.

For case, a coupling reagent with an electron-donating gather can increment the electron thickness on the chromophore and move the λmax to a longer wavelength, while a coupling reagent with an electron-withdrawing bunch can diminish the electron thickness on the chromophore and move the λmax to a shorter wavelength.

The number of fragrant rings within the nucleophile can moreover influence the λmax of the azo dye. Fragrant rings are electron-rich and can give electrons to the chromophore, expanding its electron thickness and moving the λmax to a longer wavelength.

Hence, a nucleophile with different fragrant rings will have a more prominent impact on the λmax of the color than a nucleophile with only one fragrant ring.

In rundown, both the conjugation of the coupling reagent and the number of fragrant rings within the nucleophile can impact the electronic structure of the azo color and move its λmax.

Be that as it may, the impact of the nucleophile is ordinarily more critical since it specifically influences the electron thickness of the chromophore. 

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Ozone  is the primary absorber of UV radiation in the 150-200 nm range in the upper atmosphere, and its depletion can have significant consequences for life on Earth.

UV radiation with wavelengths between 150-200 nm is highly energetic and can cause damage to living cells by breaking chemical bonds and damaging DNA. Therefore, it is important to prevent most of this radiation from reaching the Earth's surface where it can harm living organisms.

In the upper atmosphere, ozone (O3) plays a crucial role in absorbing this harmful UV radiation through the process of photodissociation. When a molecule of ozone absorbs a photon of UV radiation, it undergoes photodissociation or photolysis, which results in the dissociation of the ozone molecule into an oxygen molecule (O2) and an oxygen atom (O):

O3 + hv -> O2 + O

This process is highly efficient and can absorb more than 97% of the incoming UV radiation in the 150-200 nm range. The oxygen atoms produced in this process can then react with other oxygen molecules to form more ozone, thereby replenishing the ozone layer and continuing this protective cycle.

While other molecules such as nitrogen (N2) and oxygen (O2) can also absorb UV radiation in this range, they are much less efficient at doing so compared to ozone. Therefore, ozone is the primary absorber of UV radiation in the 150-200 nm range in the upper atmosphere, and its depletion can have significant consequences for life on Earth.

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The helium pressure is 799 torr.

As 1 mm Hg is equal to 1 torr. In an open-ended mercury manometer, the pressure will be equal to the atmospheric pressure.

Also, the pressure of the mercury level in the open arm is 47 mm above that in the arm connected to the flask of helium. Add both the given numbers,

(752 + 47) mm Hg = 799 torr

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The sample of pure carbon would contain approximately 2.135 x 10²⁴ carbon atoms.

The majority of carbon atoms—98.93%—have masses of 12 atomic mass units. A mass of 13.00 atomic mass units is present in 1.07% of the carbon atoms. 14.) Identify one distinction between the nuclei of carbon-12 and carbon-13 atoms in terms of the subatomic particles that can be discovered there.

First, using the atomic mass of carbon, we must determine how many moles of carbon are present in the sample:

1 mole of carbon atoms = 12.01 g of carbon atoms (atomic mass of carbon)

42.552 g of carbon atoms / 12.01 g/mol = 3.545 moles of carbon atoms

Using Avogadro's number, we can then determine how many carbon atoms are present in the sample:

Number of carbon atoms = 3.545 moles of carbon atoms x 6.022 x 10²³ atoms/mole

Number of carbon atoms = 2.135 x 10²⁴ atoms

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The concentrations of major species in a mixture of weak and strong acids and bases are determined by their dissociation behavior and interaction in a solution, influencing the overall pH and buffering capacity.

The relationship among the concentrations of major species in a mixture of weak and strong acids and bases can be understood through their dissociation and interaction in a solution.

Strong acids, such as HCl, fully dissociate in water, releasing a high concentration of H+ ions. Similarly, strong bases, like NaOH, dissociate completely, releasing a high concentration of OH- ions.

Weak acids, such as acetic acid (CH3COOH), only partially dissociate in water, releasing a smaller concentration of H+ ions. Likewise, weak bases, like ammonia (NH3), partially dissociate, releasing a smaller concentration of OH- ions.

When a mixture of weak and strong acids and bases is present, the strong species will react first due to their higher concentrations of H+ or OH- ions. This reaction will affect the pH of the solution, as well as the concentrations of the weak species, as they will be buffered by the strong species.

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A pure substance (such as H₂O or iron) can only exist in three phases (solid, liquid, and gas) - True.

A kind of matter with a predictable chemical composition and physical characteristics is referred to as a chemical substance. According to certain texts, a chemical compound cannot be physically divided into its component parts without rupturing chemical bonds. Chemical compounds, alloys, and simple substances (substances made up of a single chemical element) are all examples of chemical substances.

To distinguish them from mixes, chemical compounds are frequently referred to as 'pure'. Pure water is a popular illustration of a chemical substance; regardless of whether it is separated from a river or created in a lab, it has the same characteristics and hydrogen to oxygen ratio. Other chemicals that are frequently found in their purest forms are refined sugar (sucrose), gold, table salt (sodium chloride), and diamond (carbon). In reality, though, no material is completely pure, and chemical purity is determined by the chemical's intended application.

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We can conclude that the value of A must be less than the value of B. Based on the graph, the value of B is around 0°C. So, we can estimate that the value of A is likely to be around -10°C to 0°C.

What is Temperature?

Temperature is a physical quantity that measures the degree of hotness or coldness of an object or substance. It is a measure of the average kinetic energy of the particles that make up a system.

In simpler terms, temperature is a measure of how fast the atoms and molecules in a substance are moving. When the particles are moving faster, the temperature is higher, and when they are moving slower, the temperature is lower.

Based on the given information, we know that at time 0 minutes, the temperature is labeled as A. Therefore, to find the temperature value of A, we need to look at the y-axis at time 0 minutes.

Since the temperature scale is not given, we cannot determine the numerical value of A directly. However, we can make some observations about the graph to infer the approximate value of A.

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The heat capacity of 28.4 g of water is 118.8976 J/°C. The closest option to this answer is option b) 119 J/°C.

To calculate the heat capacity of 28.4 g of water, we need to use the formula:

Heat capacity = mass x specific heat

where mass is given as 28.4 g and specific heat of water is given as 4.184 J/g.°C.

So, substituting the values in the formula, we get:

Heat capacity = 28.4 g x 4.184 J/g.°C
Heat capacity = 118.8976 J/°C


To calculate the heat capacity of 28.4 g of water, you need to multiply the mass of water (m) by its specific heat (c). The formula for heat capacity (Q) is:

Q = m × c

Given:
m = 28.4 g
c = 4.184 J/g.°C

Substitute the values and perform the calculation:

Q = 28.4 g × 4.184 J/g.°C = 118.8 J/°C

The closest answer among the given options is:

b) 119 J/°C

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The acid dissociation constant (Ka) for uric acid is [tex]1.0 x 10^-5.[/tex]

The dissociation of uric acid can be represented as follows:

H2UA ⇌ H+ + HUA

The equilibrium expression is given by:

Ka = [H+][HUA-]/[H2UA]

where Ka is the acid dissociation constant, [H+] is the concentration of hydrogen ions, [HUA-] is the concentration of the urate ion, and [H2UA] is the concentration of uric acid.

At equilibrium, the concentration of H2UA is equal to the initial concentration minus the concentration of H+ ions that have been consumed:

[H2UA] = 0.110 - [H+]

The concentration of HUA- can be calculated from the equation:

[HUA-] = [H+]

Substituting the above expressions into the equilibrium expression for Ka, we get

[tex]Ka = ([H+]^2) / (0.110 - [H+])[/tex]

Substituting [H+] = 3.4 x 10^-2 M, we get:

[tex]Ka = [(3.4 x 10^-2)^2] / (0.110 - 3.4 x 10^-2)[/tex]

[tex]Ka = 1.0 x 10^-5[/tex]

Therefore, the acid dissociation constant (Ka) for uric acid is [tex]1.0 x 10^-5.[/tex]

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CH4 has only sigma bonds between the carbon and hydrogen atoms, and no pi bonds.

The answer is (E) CH4.

Pi bonding refers to the sharing of electrons between two atoms that occurs when two atomic orbitals with parallel electron spins overlap. Pi bonds are formed by the sideways overlap of two p orbitals.

In the given options, all except CH4 have pi bonds:

(A) CO2 has two pi bonds between the carbon atom and the oxygen atoms.
(B) C2H4 has a double bond between the two carbon atoms, which consists of one sigma bond and one pi bond.
(C) CN− has a triple bond between the carbon and nitrogen atoms, consisting of one sigma bond and two pi bonds.
(D) C6H6 has six pi bonds due to the delocalized pi electron system in the benzene ring.

In contrast, CH4 has only sigma bonds between the carbon and hydrogen atoms, and no pi bonds.

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Answer:

mass of NH₃ formed when 22g of H₂ react completely = 124.67 grams

Explanation:

3H₂ + N₂ → 2NH₃

The ratio of coefficients of reactants and products in the above reaction equation (3 : 1 : 2), is known as the stoichiometry of the reaction.

A stoichiometric amount of a reagent is the the optimum amount or ratio where, assuming that the reaction proceeds to completion, all of the reagent is consumed, there is no deficiency of the reagent, and there is no excess of the reagent. Thus if the stoichiometry of a reaction is known, as well as the mass of one of the substances, then it is possible to calculate the mass of any of the other substances.

The mole is a unit of amount of substance established by the International System of Units, to make expressing amounts of reactant or product in a reaction more convenient. As defined by Avogadro's Constant, a mole is 6.022×10²³ amounts of something. The mole is used in stoichiometric calculations, instead of the mass.

To convert from mass to moles, we need to divide the mass present in grams, by the molar mass of the substance (the sum of the molar masses of the individual elements comprising the compound), in g/mol, to get the moles. This can be represented by the formula: n = m/M, where n = number of moles, m = mass, M = molar mass.

So if we have 22 g of H₂ gas, which reacts completely, and therefore is a stoichiometric amount, then converting this to moles:

n(H₂) = m/M = 22/2 = 11 mol.

Using our stoichiometry, we can see that the ratio of H₂ to NH₃ = 3 : 2.

Therefore, for every 3 moles of H₂ used, we produce 2 moles of NH₃.

n(NH₃) = 2/3 × n(H₂) = 2/3 × 11 = 7.333 mol.

Finally, converting moles back to mass we get:

m(NH₃) = n×M = 7.333×17 = 124.67 grams

∴ mass of NH₃ formed when 22g of H₂ react completely = 124.67 grams

(a) If one of the reaction products was the then unknown neutron, what was the other product is the C -12.

(b) The q-value of this reaction is the 5.9 × 10⁸ J.

The James Chadwick was discovered the neutron during the experiment involving the nuclear reaction in that the beryllium, bombarded with the alpha particles. The equation of the reaction is as :

⁴Be₉  +  ²He₄  ---->  ⁶C₁₂  +  ⁰n₁

(a) If one of the reaction products was the then unknown neutron, what was the other product is the C -12.

(b) The q-value of this reaction is as :

q = mc²

Where,

The m is the mass

The c is the speed of the light.

m = 4.002603 + 2.014102

m = 1.988501

q = 1.988501  × 3 × 10⁸

q = 5.9 × 10⁸ J

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The volume of 4.50 moles of nitrogen gas at STP is approximately 101 L. So, the correct answer is 101 L.

At STP (standard temperature and pressure), the volume of one mole of any gas is 22.4 liters. Therefore, to find the volume of 4.50 moles of nitrogen gas at STP, we can simply multiply the number of moles by the molar volume:

At STP (Standard Temperature and Pressure), the volume of 4.50 moles of nitrogen gas (N2) can be calculated using the ideal gas law:

PV = nRT

Where P is the pressure (which is 1 atm at STP), V is the volume, n is the number of moles, R is the gas constant, and T is the temperature (which is 273.15 K at STP).

Rearranging this equation to solve for V, we get:

V = (nRT)/P

Substituting the values for n, R, P, and T, we get:

V = (4.50 mol x 0.08206 L atm K^-1 mol^-1 x 273.15 K)/1 atm

V = 101.3 L

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Taking into account definition of reaction stoichiometry, 209.36 grams of Mg(OH)₂ are needed.

In first place, the balanced reaction is:

3 Mg(OH)₂ + 2 H₃PO₄ → Mg₃(PO₄)₂ + 6 H₂O

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 196 grams of H₃PO₄ react with 174.99 grams of Mg(OH)₂, 2.345×10² grams of H₃PO₄ react with how much mass of Mg(OH)₂?

mass of Mg(OH)₂= (2.345×10² grams of H₃PO₄× 174.99 grams of Mg(OH)₂)÷ 196 grams of H₃PO₄

mass of Mg(OH)₂= 209.36 grams

Finally, 209.36 grams of Mg(OH)₂ is required.

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Answer:

physical change, because a new substance is not formed

Explanation:

Answer:

4) physical change, because a new substance is not formed

a physical change is where you can change the look and feel of whatever and get it back to what it was before but a chemical change. is a change where you can not get back to what it was originally

Explanation:

please give me brainliest

Answer:

Answer (Detailed Solution Below)

Explanation:

Option 3 : Substance in solid phase has the least entropy.

The volume of a solution, prepared by diluting a 1.0 L solution of 0.40 M KOH to 0.13 M is approximately 3.08 liters.

To calculate the volume of a solution, in liters, prepared by diluting a 1.0 L solution of 0.40 M KOH to 0.13 M, you can use the dilution formula:

M1V1 = M2V2

where M1 is the initial molarity of the solution (0.40 M), V1 is the initial volume of the solution (1.0 L), M2 is the final molarity of the solution (0.13 M), and V2 is the final volume of the solution (in liters) that we need to find.

Rearrange the formula to solve for V2:

V2 = (M1V1) / M2

Now, plug in the given values:

V2 = (0.40 M * 1.0 L) / 0.13 M

V2 = 0.40 L / 0.13

V2 ≈ 3.08 L

So, the volume of the diluted solution is approximately 3.08 liters.

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The volume of the solution after dilution is approximately 3.08 liters.

To calculate the volume of the solution, we can use the formula:

V1C1 = V2C2

where V1 is the initial volume, C1 is the initial concentration, V2 is the final volume, and C2 is the final concentration.

Plugging in the values given in the question, we get:

(1.0 L)(0.40 M) = V2(0.13 M)

Solving for V2, we get:

V2 = (1.0 L)(0.40 M) / (0.13 M) = 3.08 L

Therefore, the volume of the solution, in liters, prepared by diluting a 1.0 L solution of 0.40 M KOH to 0.13 M is 3.08 L.
Hi! I'd be happy to help you calculate the volume of the solution. To do this, we'll use the dilution formula:

C1V1 = C2V2

where C1 and V1 represent the initial concentration and volume, and C2 and V2 represent the final concentration and volume.

1. Plug in the given values:
C1 = 0.40 M (initial concentration of KOH)
V1 = 1.0 L (initial volume of the solution)
C2 = 0.13 M (final concentration of KOH)

2. Rearrange the formula to solve for V2:
V2 = (C1V1) / C2

3. Substitute the values into the formula:
V2 = (0.40 M × 1.0 L) / 0.13 M

4. Calculate V2:
V2 ≈ 3.08 L

So, the volume of the solution after dilution is approximately 3.08 liters.

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The volume of the sample of wood is 110.9 mL.

Volume is the measure of the amount of space which is occupied by an object or the substance. It is usually expressed in units such as liters, milliliters, cubic meters, or cubic centimeters. The volume of a solid can be calculated by measuring its dimensions and using mathematical formulas, while the volume of a liquid can be measured directly using a graduated cylinder or a pipette.

To find the volume of the sample of wood, we can apply the following formula;

Density = Mass/Volume

Rearranging the formula, we get;

Volume = Mass/Density

Substituting the given values, we get:

Volume = 95.1 g / 0.857 g/mL

Volume = 110.9 mL

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The chemical symbol for the ion with an atomic anion and a charge of -1, and electron configuration of 2s22p5 is Cl⁻. The Cl⁻ ion has 18 electrons.

This is because the electron configuration matches that of the element chlorine, which is found in group 7 of the periodic table. The Cl⁻ ion is formed when chlorine gains an extra electron to fill its valence shell and achieve a stable octet configuration.

The Cl⁻ ion has 18 electrons in total, as it has gained one extra electron compared to the neutral chlorine atom. The ion now has a full outer shell with 8 electrons, making it stable and less reactive than its neutral counterpart.

The Cl⁻ ion is commonly found in nature, particularly in the form of sodium chloride (NaCl) or table salt. The Cl⁻ ion is also used in various chemical processes, such as in the production of bleach and other disinfectants. Overall, the Cl⁻ ion plays an important role in many chemical reactions and is essential for maintaining the balance of charges in various compounds.

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The total number of joules of heat energy needed to raise the temperature of 10 grams of water from 20°C to 30°C is 418.4 J. The specific heat capacity of water is 4.184 J/g·°C.

To find the total heat energy needed, we can use the formula:

Q = m·c·ΔT

where:

Q = heat energy (in Joules)

m = mass of the water (in grams)

c = specific heat capacity of water (4.184 J/g·°C)

ΔT = change in temperature (in °C)

Substituting the values given, we get:

Q = 10 g × 4.184 J/g·°C × (30°C - 20°C)

Q = 418.4 J

Therefore, the total number of joules of heat energy needed to raise the temperature of 10 grams of water from 20°C to 30°C is 418.4 J.

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The pair of elements that are nonmetals and gases at room temperature and normal atmospheric pressure are:

Oxygen (O₂) - Oxygen is a nonmetal that exists as a diatomic gas at room temperature and normal atmospheric pressure. It is colorless, odorless, and tasteless.

Nitrogen (N₂) - Nitrogen is another nonmetal that exists as a diatomic gas at room temperature and normal atmospheric pressure. It is also colorless, odorless, and tasteless.

Both oxygen and nitrogen are essential components of the Earth's atmosphere, with nitrogen making up about 78% of the air we breathe and oxygen making up about 21%.

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The average repeat unit molecular weight for average molecular weight of 229,500 g/mol and a number degree of polymerization of 4,000 is equals to the 57.4 g/mol. So, option(c) is right one.

Polymers are large molecules made up of repeating structural units linked together. The degree of polymerization (DP) is the number of repeating units in the polymer molecule. The average molecular weight is the degree of polymerization (MP) multiplied by the molecular weight of the repeat unit (m) is written as [tex] \bar M_n = (DP)(m)[/tex]

We have a random copolymer produced by polymerization of vinyl chloride and propylene.

Average molecular weight= 229500 g/mol

Number degree of polymerization = 4000

Using the above formula, the average repeat unit molecular weight = 229500 g/mol/ 4000

= 57.37 ~ 57.4 g/mol

Hence, required value is 57.4 g/mol.

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When solid mercury(I) chloride (Hg₂Cl₂) reacts with ammonia (NH₃), two precipitates form: white mercurous ammonium chloride (HgNHCl) and black mercuric nitride (Hg₃N₂).

The chemical equation for the reaction is:

Hg₂Cl₂(s) + 2NH₃(aq) → HgNH₂Cl(s) + Hg₃N₂(s) + 2HCl(aq)

The first precipitate, mercurous ammonium chloride, is a white solid that forms because of the reaction between Hg₂Cl₂ and NH₃. It is also known as white precipitate and has a molecular formula of HgNH₂Cl.

The second precipitate, mercuric nitride, is a black solid that forms because of the reaction between the excess ammonia and the Hg²⁺ ions produced by the Hg₂Cl₂. The molecular formula of mercuric nitride is Hg₃N₂.

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