Which equation describes a combustion reaction?


Responses


H2SO3→H2O+SO2



C10H8+12O2→10CO2+4H2O



NaHCO3+CH3COOH(aq)→H2CO3+NaCH3COO



4Al(s)+3O2(g)→2Al2O3(s)

When the metal is seen to start melting at a temperature of about 29°C in its container, gallium is most likely the metal.

A metal is a substance that exhibits a shiny appearance when freshly processed, polished, or shattered, and conducts electricity and heat rather well. Generally speaking, metals are malleable and ductile. These characteristics are the outcome of the metallic link that exists between the metal's atoms or molecules. Any of a group of materials known as metals that exhibit strong thermal and electrical conductivity as well as malleability, ductility, and high light reflection.

Extraction of the unprocessed ore from the earth is the initial step in the production of metal alloys. The non-metal components, like as rock and rubbish, are subsequently removed from the ore during processing. Metal alloys are created by melting and mixing different metal parts.

The majority of pure metals are located in the crust of the earth. Ores, which are solid substances from which metals and minerals can be extracted, are where they are found. Iron makes up almost a third of the planet's mass, and most of it is concentrated in its core.

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The net molecular and energetic effects of glycolysis, the conversion of pyruvate, and the citric acid cycle are 4 ATP, 10 NADH, and 2 FADH2 in line with a molecule of glucose.

Glucose is an easy sugar with the molecular formulation C₆H₁₂O₆. Glucose is ordinarily the maximum considerable monosaccharide, a subcategory of carbohydrates.

In the hyperglycemia method, there may be too much sugar inside the blood because the frame lacks enough insulin. associated with diabetes, hyperglycemia can motivate vomiting, immoderate starvation and thirst, fast heartbeat, imaginative and prescient issues, and other signs. Untreated hyperglycemia can lead to extreme fitness problems.

A blood sugar degree of less than 140 mg/dL is every day. An analysis of more than two hundred mg/dL after-hours approach you have got diabetes. An analyzing between a hundred and forty and 199 mg/dL manner you've got prediabetes.

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Micronutrient is another name for a trace element. It is also described as any chemical component of a crucial enzyme that is needed by living things in minute or small levels.

In biology, a trace element is any chemical element that is needed by living things in very small levels (less than 0.1 percent by capacity [1,000 parts per million]), typically as a component of an essential activity (a cell-produced catalytic protein).

Minerals known as trace elements or trace metals are minor levels of which are found in living tissues. Some of them have been known to be physiologically necessary, some might be (but the evidence is merely speculative or sparse), and the rest are regarded as nonessential.

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It all happens due to VSPER model and the lone pair decreases the bond angle between bonding pairs of atoms.

The Lewis electron-pair technique identifies which atoms have lone pairs of electrons and can be used to forecast the number and types of bonds that will exist between the atoms in a substance. However, this method offers little insight into how atoms are actually arranged in space. The valence-shell electron-pair repulsion (VSEPR) model, which can be used to predict the shapes of many molecules and polyatomic ions, is introduced as we continue our discussion of structure and bonding. However, keep in mind that the VSEPR model, like any model, is only a partial representation of reality; it doesn't reveal bond lengths or the existence of multiple bonds.

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They will have the same number of molecules.

At stp every gas contains Na number of molecules for 22.4l

Here the volume of each flask is 1l

Here we know that

For 1l each gas will consists of  Na/22.4 molecules.

Here Na = 6 × 10^24

We here thus mention

By avogadro's hypothesis

The number of molecules present in the same condition for different species for the same volume must be equal.

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The change in ph when 9.00 ml of 0.100 m hcl(aq) is added to 100.0 ml of a buffer solution that is 0.100 m in nh3(aq) and 0.100 m in nh4cl(aq). consult

1)

Step 1: Calculate initial pH

Kb = 1.8*10^-5

pKb = - log (Kb)

= - log(1.8*10^-5)

= 4.745

use:

pOH = pKb + log {[conjugate acid]/[base]}

= 4.745+ log {0.1/0.1}

= 4.745

use:

PH = 14 - pOH

= 14 - 4.7447

= 9.2553

Step 2: Calculate pH after adding HCl

mol of HCl added = 0.1M *9.0 mL = 0.9 mmol

NH3 will react with H+ to form NH4+

Before Reaction:

mol of NH3 = 0.1 M *100.0 mL

mol of NH3 = 10 mmol

mol of NH4+ = 0.1 M *100.0 mL

mol of NH4+ = 10 mmol

after reaction,

mol of NH3 = mol present initially - mol added

mmol of NH3 = (10 - 0.9) mmol

mol of NH3 = 9.1 mmol

mol of NH4+ = mol present initially + mol added

mol of NH4+ = (10 + 0.9) mmol

mol of NH4+ = 10.9 mmol

since volume is both in numerator and denominator, we can use mol instead of concentration

Kb = 1.8*10^-5

pKb = - log (Kb)

= - log(1.8*10^-5)

= 4.745

After the reaction, the following equation holds true: mol of NH3 = mol present initially - mol added mmol of NH3 = (10 - 0.9) mmol mol of NH3 = 9.1 mmol mol of NH4+ = mol present initially + mol added mol of NH4+ = (10 + 0.9) Since volume appears in both the numerator and denominator of the equation, we can use mol in place of concentration: mmol mol of NH4+ = 10.9 mmol

Kb = 1.8*10-5 pKb = -log(Kb) = -log(1.8*10-5) = 4.745

Employ: pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [10.9/9.1] = 4.823

employ: PH = 14 - pOH = 14 - 4.8231 = 9.1769

Step 3: Subtract the final pH from the initial pH to arrive at a change delta pH of -0.0784 (9.1769 - 9.2553).

Incorrect: -0.0784

2) The reaction between NH4+ and OH- will produce NH3 when mol of NaOH supplied is 0.1M *9.0 mL = 0.9 mmol.

NH3 = 0.1 M * 100.0 mL mol of NH3 = 10 mmol NH4+ = 0.1 M * 100.0 mL mol of NH4+ = 10 mmol

After reaction, the equation is: Mol of NH3 = Mol originally present + Mol of NH3 added = (10 + 0.9). mmol mol of NH3 equals 10.9 mmol mol of NH4+ equals mol initially present minus mol added mol of NH4+ = (10 - 0.9) Since volume is in both the numerator and the denominator of mmol mol of NH4+ = 9.1 mmol, we can substitute mol for concentration.

Kb = 1.8*10-5 pKb = -log(Kb) = -log(1.8*10-5) = 4.745

Make use of: pOH = pKb + log [conjugate acid]/[base] = 4.745 + log [9.1/10.9] = 4.666

employ: PH = 14 - pOH = 14 - 4.6663 = 9.3337

delta pH = final pH - initial pH

= 9.3337 - 9.2553

= 0.0784

Answer: 0.0784

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The answer is Redox Reaction.

What are Redox Reactions?

A redox reaction can be defined as a chemical reaction in which electrons are transferred between two reactants participating in it. This transfer of electrons can be identified by observing the changes in the oxidation states of the reacting species.

The loss of electrons and the corresponding increase in the oxidation state of a given reactant is called oxidation. The gain of electrons and the corresponding decrease in the oxidation state of a reactant is called reduction.

Electron-accepting species which tend to undergo a reduction in redox reactions are called oxidizing agents. An electron-donating species which tends to hand over electrons can be referred to as a reducing agent. These species tend to undergo oxidation. It can be noted that any redox reaction can be broken down into two half-reactions, namely the oxidation half-reaction and the reduction half-reaction.

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The marble chips are reacted with a solution that produces a gas that turns the lime water milky.

This means that the gas produced is carbon dioxide. Therefore, carbonates only produce carbon dioxide gas when treated with acids. Marble chips are alkaline compounds that react with hydrochloric acid to produce carbon dioxide calcium chloride and water. Marble chips are composed of calcium carbonate.

Adding dilute hydrochloric acid to a piece of marble which is calcium carbonate forms calcium chloride, water, and carbon dioxide. Marble fragments react with dilute hydrochloric acid to produce carbon dioxide gas. The speed of this reaction can be changed by changing the size of the marble chips. This produces carbon dioxide and calcium chloride.

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The best indicator for the pH of 4 x 10⁻⁴ M HCl would be bromocresol purple which is yellow at the pH of HCl = 3.4.

Ka for acetic acid = [H₃O⁺][A⁻]/[HA]

knowing pH,

pH = -log[H₃O⁺]

[H₃O⁺] = [A⁻]

and, [HA] concentration we can determine Ka for each solution

for basic salts as

Na₂CO₃, the net ionic equation would be,

(CO₃)₂⁻ + H₂O <==> HCO₃⁻ + OH⁻

NaHCO3, the net ionic equation would be,

HCO₃⁻ + H₂O <==> H₂CO₃ + OH⁻

similarly, other salts which give OH- ion in solution is basic and the ones that give H₃O⁺ in solution are acidic in nature,

acidic salts like NH₄⁺

NH₄⁺ + H₂O <=> NH₃ + H₃O⁺

Hence, the best indicator for the pH of 4 x 10⁻⁴ M HCl would be bromocresol purple which is yellow at the pH of HCl = 3.4.

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Molecules are called autocrine regulators if they act on the same cell type as the one that produced them, while paracrine regulators, particularly if they are produced by one cell type, can regulate neighboring cells of the same organ.

In this review, the term "autocrine signalling" will be used to describe signals secreted by a cell that may bind to that cell or to a nearby cell with a similar phenotype, whereas the term "paracrine signalling" will be used to describe signals produced by a cell that that cell type cannot respond to but that other cell types can.

A paracrine ligand is a tool to spread the message from one cell type to the others, whereas an autocrine signal acts as an amplifier or a brake for message transmission. Multiple GPCR subtypes that are expressed in various cell types have been found to be capable of recognising a wide variety of ligands.

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The most appropriate reagent(s) for the conversion of trans-4-tert-butylcyclohexanol to the corresponding tosylate ester is Chromic acid.

What is Chromic acid?

Chromic acid anodizing has been used to protect aluminum from oxidation for many years. The anodizing process builds a basic oxide layer that supports a tubular cell structure. Chromic acid (H2CrO4) reacts with alcohols to form a chromic ester in which the alcohol oxygen atom bridges the carbon and chromium atoms. The ester forms by nucleophilic attack of the alcohol oxygen atom on the chromium atom. This reaction is analogous to an SN2 reaction with an a─OH group of chromic acid as the leaving group.

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The net ionic reaction for the precipitation reaction is

b)SrCl₂ + K₂SO₄ → SrSO₄ + 2KCl

The precipitation reaction between strontium chloride (SrCl₂) and potassium sulfate (K₂SO₄) is a double replacement reaction and produces an insoluble solid. The net ionic reaction for this precipitation reaction is as follows:

SrCl₂ + K₂SO₄ → SrSO₄ + 2KCl

In this reaction, a cation (positively-charged ion) from one reactant (strontium) is exchanged for a cation from the other reactant (potassium). At the same time, an anion (negatively-charged ion) from one reactant (chloride) is exchanged for an anion from the other reactant (sulfate). The products of this reaction are a soluble sodium chloride solution and an insoluble strontium sulfate solid. The insoluble solid separate out of the solution, forming a precipitate.

Hence the correct option is B.

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The compounds which shows UV absorbance between 200-400 nm are Caffeine, Salicylic acid, Acetaminophen and Aspirin.

What is chemical bond?

Atoms in molecules are joined by chemical bonds. Electrostatic forces between negatively charged electrons and positively charged atomic nuclei result in bonds.

What is UV?

The wavelength of ultraviolet (UV) radiation ranges from 10 nanometers (with a corresponding frequency of about 30 PHz) to 400 nanometers (750 THz), which is shorter than that of visible light but longer than X-rays.

The compounds C, D and E shows UV absorbance between 200-400 nm.

The compounds which shows UV absorbance between 200-400 nm are Caffeine, Salicylic acid, Acetaminophen and Aspirin.

Therefore, compounds which shows UV absorbance between 200-400 nm are Caffeine, Salicylic acid, Acetaminophen and Aspirin.

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Hydrochloric acid has a molarity of 5.708 M, a mass content of 19.0%, and a density of 1.095 g/ml.

Hydrochloric acid, also referred to as muriatic acid, is hydrogen chloride in an aqueous solution. It is odourless and colourless, and it smells strongly. It is classified as a strong acid. It is a component of gastric acid, which is present in the digestive systems of the majority of animal species, including humans.

Hydrogen chloride (HCl) is often used as a bleaching agent to neutralise alkaline compounds in the food, textile, metal, and rubber industries. It is neutralised when released into the soil, and it hydrolyzes quickly when it comes into contact with water.

If hydrochloric acid burns are in contact with skin or other tissues, they can cause excruciating pain. Ingestion of hydrochloric acid might result in blindness. The concentration of the acid and how long it remains in contact with the tissues determine how severe the burns are.

The solute concentration in moles is divided by the volume of the solution in litres to determine the solution's molarity.

M = moles of solute/liters of solution.

By dividing the total number of moles of solute by the total volume of litres of solution, we may determine the molarity.

Consider a 100g solution. The solution has 19.0% of its bulk in hydrochloric acid. and the provided solution has a density of 1.095 g/mol. We may determine the molarity of the solution by inserting each of these values.

mass acid hydrochloric,

100g solution x (19.00g / 100g solution) = 19.00g Hcl

moles of hydrochloric acid is ,

19.00g HCl x (1 mole Hcl / 36.45g HCl) = 0.52126

then, the answer is,

100g solution x (1mL solution / 1.095g solution) x (1L / 1000mL) = 0.091324L

molarity HCl = 0.52126 mole / 0.091324L = 5.708M.

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If 5 mole no2 react with 1 mole h2o, then 4  moles of the excess reactant (N2O) remains when the reaction is complete

N2O + H2O → 2 HNO

1 mole of N2O reacts with 1 mole of H2O.

if 5 mole N2O reacts with 1  mole of H2O, then 4 mole of mole N2O remains, thus concludes  N2O is excess reactant.

A balanced chemical equation's molar amounts of the reactants and products are displayed. In the real world, reactants are rarely combined in precisely the right ratio. One reactant will completely exhaust before the others. A reaction's limiting reactant is the one that is used up first. Once the other reactants have been consumed to some extent, the remaining amount is considered "in excess."

To determine which reactant is the limiting one, determine the volume of the product that each reactant produced. The reactant with the lowest product yield is the limiting reactant.

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Answer:

In order of decreasing acceleration experienced by each ship, the names of the ships are as follows:

Viceroy

Standard

Skipjack

Thunderor

Eden

The hydrogen atoms are in the first excited state at room temperature.

The hydrogen atom is the best of all atoms: it consists of a single proton and a single electron. in addition to the most not unusual shape of the hydrogen atom, which is known as protium,  other isotopes of hydrogen exist in deuterium and tritium.

A hydrogen atom is an atom of the chemical detail hydrogen. The electrically impartial atom consists of an unmarried definitely charged proton and a negatively charged electron bound to the nucleus via the Coulomb force. Atomic hydrogen constitutes about seventy five% of the baryonic mass of the universe.

Hydrogen, H, is a pretty flammable gasoline and the maximum commonplace aspect of the universe. it is the lightest element ever and is colorless, odorless, and tasteless. it's also in maximum organic compounds.

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It goes SP2 hybridization on reacting substrate carbon atom in the passage undergo hybridization state changes during the reaction.

SP2 hybridization is the mixing of one s and two p atomic orbitals, which involves the promotion of one electron in the s orbital to one of the 2p atomic orbitals. The combination of these atomic orbitals creates three new hybrid orbitals equal in energy-level. The hybrid orbitals are higher in energy than the s orbital but lower in energy than the p orbitals, but they are closer in energy to the p orbitals. The new set of formed hybrid orbitals creates trigonal structures, creating a molecular geometry of 120 degrees. One of a set of hybrid orbitals produced when one s orbital and two p orbitals are combined mathematically to form three new equivalent orbitals oriented toward the corners of a triangle. This involves the mechanism of sp2 hybridization.

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Yes. Gay-law Lussac's states that the pressure and temperature of a gas are directly proportional at constant volume.

Why does pressure rise as temperature rises?

According to Gay-Law, the pressure of a given mass of gas varies directly with the absolute temperature of the gas when the volume is held constant.

The pressure of a given quantity of gas is directly proportional to its absolute temperature as long as the volume remains constant (Amontons' law). The volume of a given gas sample is directly proportional to its absolute temperature at a fixed pressure, according to Charles' law.

The frequency of collisions between molecules and the surface of a container generates pressure. If the temperature of the container is raised, the molecules will move faster. The occurrence of

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True. Every nonsingular second-order linear ordinary differential equation a(x)u" + 6(x) u' + c(u) u = f(x), subject to homogeneous Dirichlet boundary conditions on an interval [a,b], is (a) self-adjoint.

Generally speaking, homogenous refers to having same pieces or components. Homogeneous refers to something that is consistent in nature or character throughout. A variety of objects that are basically similar to one another or belong to the same sort can also be referred to as homogenous.

A homogenous mixture is one whose composition is constant across the whole mixture. The dissolved salt is uniformly dispersed across the whole salt water sample, making the salt water in the example above homogenous.

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Answer:

Crack Repair

Explanation:

The process of filling a damaged, broken, lifted, or cracked monomer liquid and polymer powder nail enhancement with additional monomer liquid and polymer powder is called crack repair.

A polymer can be natural or synthetic substance, composed of very large molecules that are multiples of simpler chemical units called monomers.

There are 3 major classes of polymers –

Thermoplastics,

Thermosets, and

Elastomers.

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The Molecular formula of Decane is C10H22

Combustion of Decane as follows ;                                                            C10H22 (l) + O2 (g) ==>  CO2(g)+ H2O(g) ,When we burn Liquid Decane(C10H22) into oxygen(O2) gas then it produce  Water vapour and Carbon dioxide gas.

The balance equation of Combustion as follows ;

2C10H22 (l) + 31O2 (g) ==>  20CO2(g)+ 22H2O(g)

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The number of  moles of hydrogen peroxide will be oxidized by 0.0435 moles of potassium permanganate an acidic solution is 0.054375

What is titration?

Titration is a technique used to gauge an unknown substance's concentration. Titrations, for instance, can be used to calculate the volume of solution needed to neutralize an acid. Titrations are used in redox titrations to determine the amount of the oxidizing agent that is required to oxidize a substance.

Here,

H2o2(aq} −→ 2O2 + 2H+ 2e-

MnO4−(aq)+8H++5e−→Mn2+(aq)+4H2O(l)

Combining the oxidation and reduction half~reactions for hydrogen peroxide and permanganate ion, respectively, and writing  the balanced chemical equation for the overall reaction between H2O2 and Mn04- in acid solution gives us

5 H2O2 + 2 MnO4– + 6 H+ -------> 2 Mn2+ + 8H2O + 5 O2

The mole ratio is 5 hydrogen peroxide molecules to 2 permanganate molecules in the reaction

Therefore moles oxidized by  0.0435 moles of potassium permanganate, using the ratio, is 0.054375

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Among the options, covalent bonds form between non-metal and metal elements is not true.

Ionic bonds are formed between non-metal and metal elements whereas formation of covalent bonds takes place between those two identical entities.

Covalent bonds are those created when two atoms couple up and share electrons, forming a bond. Most often, it is formed between two non-metals.

Ionic bonds are formed due to electrostatic attraction. Due to the fact that they typically develop between metals and non-metals, this is created in the oppositely charged ions of the atoms.

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The products that will be produced as a result of the given chemical reaction are attached with the answer.

We find that allylic bromination takes place here. It can be defined as the substitution of bromine for hydrogen on a benzylic/allylic carbon. This process is carried out by N-bromosuccinimide (NBS for short). The bromine is substituted next to the double bond (this is called the allylic position).

The products can be different on the basis of the symmetry of the alkene reactant. In the case of a symmetric alkene reactant, one product will be formed (first image attached below). In the case of an asymmetric alkene product, a  mixture of products, because of the two different allylic positions, is formed (second image attached below).

The complete question you might be looking for is attached (third image) below.

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As pco2 levels were increased, the concentration of a Nitrogen gas in the inhaled air was decreased in order to maintain the oxygen levels.

Atomic number 7 and the letter N designate nitrogen as the chemical element. Group 15 of the periodic table, also known as the pnictogens, contains Nitrogen gas as the lightest nonmetal element. It ranks seventh in overall abundance in the Milky Way and the Solar System, making it a common element in the cosmos. When conducting a chemical analysis, Nitrogen gas is frequently used to prepare samples.

With an atomic number of 8 and the chemical symbol O, oxygen is the eighth chemical element. It belongs to the chalcogen group in the periodic table, is a very reactive nonmetal, and is an oxidising agent that easily forms oxides with most elements as well as with other compounds. With an atomic number of 8 and the chemical symbol O, oxygen is the eighth chemical element.

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A colorimeter is an instrument used to measure the amount of heat absorbed by a solution. This absorbance is proportional to the concentration of the solute in the solution.

A calorimeter is a device used in calorimetry, a method for measuring the heat of chemical reactions or other physical changes and estimating heat capacity. Differential scanning calorimeters, isothermal micro calorimeters, titration calorimeters, and accelerated rate calorimeters are a few of the most common types.

Two compounds A and B are put one at a time into a calorimeter, and the starting and ending temperatures (before and after the reaction) are noted. This information is used to determine the enthalpy change per mole of substance A in the process. An estimate of the quantity of energy released or absorbed during the reaction can be obtained by multiplying the mass and specific heat capacity of the components by the temperature change. By dividing the energy change by the amount of A that was present, the reaction's enthalpy change is determined.

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By the Ideal gas equation:

PV = nRT

-> P=nRT/V=(3.00 mol)(0.08206L atmmol K)(400. K)/(60.0L)

                   = 1.6412 atm

What is the Ideal Gas Equation?

The ideal gas law (PV = nRT) relates to the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles

(a) do not attract or repel one another and

(b) take up no space (have no volume).

No gas is truly ideal, but the ideal gas law does provide a good approximation of real gas behavior under many conditions.

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27 moles of ammonia must also be present.

The no of moles of water in solution = 6 moles

mole fraction of ammonia = number of moles of ammonia/ Total no of moles

0.818 = no of moles of ammonia / no of moles of ammonia + number of moles of water

0.818 = n1 / n1 + 6

n1  = 4.908/ 0.182 = 27 mole

One of the industrial chemicals made most frequently in the US is ammonia (NH3). In addition to being naturally occurring in both individuals and the environment, it is employed in industry and commerce. Numerous biological functions require ammonia, which also acts as a precursor to the creation of amino acids and nucleotides. Ammonia is created in soil by bacteria and is a component of the nitrogen cycle in the environment. Ammonia is also created naturally through the breakdown of organic material, such as plants, animals, and animal excrement. Approximately 80% of the ammonia produced by industry is used as fertilizer in agriculture. In addition to these uses, ammonia is also employed in the production of polymers, explosives, textiles, insecticides, dyes, and other compounds. It also serves as a refrigerant gas.

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Answer:cell potential

Explanation: