a reaction is half complete after 20 minutes. after 40 minutes, the reaction is twothirds complete. when will the reaction be 90% complete?

The correct order of the scientists who made significant contributions to our understanding of the structure and function of DNA is II, I , III, V, IV.

In molecular biology, DNA is describes as the most important component that carries genetic information.

In DNA, the particular information is stored which is processed to manufacture large macro-molecules such as proteins.

The genetic information and instructions are stored in large structures called chromosomes which are found in each cell.

Great number of short fragments of DNA join together to form chromosomes which play their role in mutation, replication, gene expressing and encoding of information.

Simply put, detailed 3D-model of DNA was suggested by Crick and Watson in 1993 which shows that DNA  is a double helix structure made up of nucleotide chains and nitrogenous bases.

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A chemist counts the quantity of mercury present in sediment samples collected from three different riverbanks (the source, the midway point, and the mouth).

A scientist who has received training inside the study of chemistry is known as a chemist (from the Greek chm(a) alchemist; replacing chymist from Latin “ alchemist). Chemists look into the composition and characteristics of stuff.

A pharmacist is a medical professional who helps prepare, controls, formulates, preserves, distributes, and advises and guides the general public on the proper use of medications to achieve maximum results. They are also referred to as chemists (Commonwealth English), druggists (North American, and, archaically, Commonwealth English) and chemists (Commonwealth English).

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Which form or forms of tagged glucose would offer yeast producing ethanol the highest radioactivity in CO2 and the least in ethanol?

A carbon atom has a nucleus made up of six protons and six neutrons that is encircled by six electrons. The first two electrons must occupy the inner atomic orbital according to quantum mechanics, while the other four electrons must have wavefunctions that only partially fill the second standard and three second primary orbitals.

Without carbon, there would be no way to support life on Earth. This is partially caused by carbon's propensity for forming bonds with other atoms, which gives biomolecules like DNA and RNA flexibility in their shape and functionality.

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The mixture's temperature rises as the ice melts and then keeps rising at the same rate after all of the ice has melted.

Up until all of the bonds keeping the molecules in a crystal structure have been broken, nothing can be done to raise the kinetic energy of the molecules in the liquid state. So long as there is ice to melt, the temperature doesn't change. When water is heated to boiling, the same process takes place.

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Water desk elevation is the upper or below surface of the groundwater, when the soil or underlying rock material is wholly saturated with water. The water table can be contamination of ground water by hazarodus wastes, fertilisers, pesticides, acid rain etc

How can a element contaminate water table?

The water desk elevation of the Clearwater lake isn't always given. Assuming, the water desk elevation of B1 is 171ft. We recognize the idea that water flows from higher elevation to lower elevation. So the wells having elevation much less than 171 feet gets infected via way of means of B1 contaminants, however the ones are having better elevation that 171ft will no longer get infected.

And approximately the route of infected water, the infected water will float closer to the course in  the Wells of decrease elevation than 171ft.

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Measurements of fossilized tree rings from the Cretaceous period is a paleoclimate proxy. -database of satellite temperature data,

An animal or plant from a previous geologic era that has been preserved in the Earth's crust as a fossil, remnant, impression, or trace. The main repository for knowledge regarding the evolution of life on Earth is the complex of information preserved in fossils found all across the world.

fossils of dinosaurs discovered in Alberta, Canada. Only a small percentage of extinct species have been preserved as fossils, and often only those with a sturdy skeleton are capable of doing so. A calcareous skeleton or shell is present in the majority of major groups of invertebrate creatures (e.g., corals, mollusks, brachiopods, bryozoans). Other types have silicon dioxide or calcium phosphate shells (both of which are found in the bones of vertebrates).

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The molar mass of the metal is 191.1g/mol.

Solution:

Since the formula for faraday's law of electrolysis is given by

Since m = 0.1427g, I = 144.2mA = 144.2mA *(1A/1000mA) = 0.1442 A= 0.1442C/s, t = 16min39s = 16min*(60s/1min) = 960+39 = 999 second Z = 2e-mol

Now put all values in the above formula

0.1427 g = (0.1442 C*999s*M*1 mole e-*1 mol/96485C*s*2e-mol)

M = (0.1427g*96485*2/0.1442*999*1)

M = 191.1538 g/mol = 191.1g/mol

Therefore the molar mass of metal will be 191.1g/mol.

For chemical elements that do not have isolated molecules such as carbon and metals, the molar mass is instead calculated by dividing by the number of atomic moles. Molar mass is defined as the mass in grams of one mole of a substance. The unit of molar mass is gram/mole, abbreviated g/mol.

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Geometric isomers are coordination compounds that have two or more of the same atom kinds, numbers, and bond types.

Geometric isomers are two coordination compounds with identical ligands that are not mirror images of one another but are positioned differently in space around the central metal ion. Trans isomers have identical ligands across from each other, whereas isomers with identical ligands adjacent to each other are referred to as cis isomers.

The only compounds with geometric isomerism are square planar and octahedral. Tetrahedral compounds do not exhibit geometric isomerism since each Ligand is positioned in the same way around the centre metal atom or ion in space. ​

Hence, coordinating substances known as geometric isomers include two or more of the same atom types, numbers, and bond types. ​

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The given redox reaction,  Cu(s)+2AgNO3(aq)⟶2Ag(s)+Cu(NO3)2(aq).

The substance gets oxidized = Cu The substance gets reduced = Ag + The oxidizing agent  =  Ag + The reducing a cu Ag

Reason:

Redox is a type of chemical reaction in which the oxidation states of the substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a decrease in the oxidation state.

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The kinetics of first order governs nuclear decay. In the event that a sample degrades from 55.4 g - 31.7 g after 3.09 minutes, what is the polonium-218 half-life?

Polonium is employed in research and antistatic devices because it is an alpha-emitter. It serves as a dominant male source there in form of a small layer on a steel disc. Eliminating static electricity from processes like rolling wire, paper, and sheet metal.

For information pertaining to the periodic table chemical element polonium, please visit its element page. The chemical element of polonium is called polonium-218, and it has a half-life of 3.10 minutes and a relative atomic mass of 218.008966.

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The room temperature BCC single-phase solid solution of carbon in iron is known as: B. Ferrite

ferrite is a ceramic-like substance having magnetic characteristics that may be used in many different kinds of electrical equipment. Ferrite are polycrystalline, or made up of many tiny crystals, and are hard, brittle, iron-containing, often gray or black materials.

Temperature is a unit of measurement that may be represented on a variety of scales, including Fahrenheit and Celsius. Temperature shows the direction of the spontaneous movement of heat energy, i.e., from a hotter body (one with a higher temperature) to a colder body (one at a lower temperature).

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According to the claim that nuclear decay follows first-order kinetics, the sample's original mass is 25.0 g.

The force found in a protons and neutrons, or core, is referred to as nuclear energy. All everything in the cosmos is made up of microscopic building blocks called atoms, and the nucleus is held together by energy.

An enormous quantity of radioactive material might be spilled into the atmosphere in the event of a nuclear facility meltdown or explosion. If there had been an explosion, everyone inside the nuclear site would likely be poisoned and potentially hurt.

Briefing:

Expression for rate law for first order kinetics is given by:

t = 2.303/k * log(a/(a - x))

where,

k = rate constant  = 0.178 days^-1

t = time passed by the sample = 15days

a = original or initial amount of the reactant

a - x = amount left after decay process = 1.73g

Now put all the given values in above equation, we get

15=(2.303/0.178) * log (a/1.73)

log (a/1.73) = 15 * 0.178/2.303

a/1.73 = 10^( 15*0.178/2.303)

a = 1.73 * 10^( 2670/2303)

a = 1.73 * 10^(1.15935736)

a = 1.73 * 14.433024871

a = 24.9691330268

Therefore, a is approximately 25 grams .

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In the E2 reaction, the percentage of formation of 1- butene was 20.7%.

The E2 reaction is defined as the process that takes place in one-step, and the E1 reaction is defined as the two-step mechanism. The numbers are used to represent the kinetics of the reaction rather than the number of steps in the mechanism.

E2 is bimolecular (second-order) kinetics, whereas E1 is unimolecular (first-order) kinetics. The three key factors that affect E1 elimination reactions are the solvent type, the leaving group's shape, and the carbocation's stability.

Hence, the percentage of formation of 1- butene was 20.7% and the reason is explained above.

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The three forms of carbon dioxide in the blood ranking them from greatest to least amount carried, the sequence would be bicarbonate ion, carbamino hemoglobin, and dissolved in plasma.

Most carbon dioxide (about 70%) is transported as bicarbonate ions in the plasma. An increase in carbon dioxide in the blood will cause a slight increase in H+ concentration (drop in pH).

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The mole fraction of ethanol c2h5oh in an aqueous solution that is 46 percent ethanol by mass is 0.25

Mole fraction is the mole of one of the component of the solution divided by the total moles of the solution

Calculating the mole fraction of ethanol,we get

Percentage by weight of ethyl alcohol is 46% which implies in 100 g of this solution is 46 g while the mass of the water will be 54% of 100 g = 54g.

Finding the moles of water and the ethyl alcohol {molar mass of water(H₂O) = 18 and molar mass of ethyl alcohol(C₂H₆O = 46}

Moles = mass/molar mass

moles of ethanol = 46/46 = 1

moles of water = 54/18 = 3

ntotal=1+3=4

Mole fraction of ethanol is:

 Mole of ethanol            =   1/4

  Total mole of solution

Hence, the mole fraction is 1/4 or 0.25

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If a bottle of nail polish remover contains 179 ml of acetone, −4349.7kJ. heat would be released by its complete combustion.

Given Data:

The volume of acetone is 179 mL.

The density of acetone is 0.788 g/mL.

Below is a diagram illustrating how acetone burns.

CH3COCH3 + 4O2 = 3CO2 + 3H2O

The heat released during the given reaction is -1790 kJ/mol. The negative sign represents the release of energy.

The formula to calculate mass from density and volume is shown below.

Mass= Density × Volume

Substitute the values of density and volume of acetone in the above formula.

Mass=0.788g/mol× 179mL=141.052g

The formula to calculate number of moles is as follows.

Number of moles=Mass/ Molarmass

Acetone has a 58.08 g/mol molar mass.

Substitute the values of mass and molar mass of acetone in the above formula.

Number of moles= 141.052g/(58.08g/mol)=2.43mol

The heat that is released from combustion of one mole of acetone is -1790 kJ/mol.

So, the heat that would be released from combustion of 2.43 mole of acetone is

(−1790kJ/mol×2.43mol) that is -4349.7 kJ.

Therefore, the heat that is released by combustion of 179 mL of acetone is

−4349.7kJ.

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When a cat with a bobtail (tt) is crossed with a cat that is heterozygous for normal tail length (Tt), the offspring will have the following genotypes: 50% will be Tt (normal tail length) and 50% will be tt (bobtail). This is because the heterozygous cat (Tt) carries one dominant allele (T) for normal tail length and one recessive allele (t) for bobtail. So, the likelihood that the offspring will have a bobtail is 50%. Therefore, the correct option is option 2.

Heterozygous refers to a genetic condition in which an individual carries two different alleles for a particular gene. Each gene in an organism typically has two alleles, one inherited from each parent. If an organism has two different alleles for a specific gene, it is considered heterozygous for that gene.

In this case, one allele is dominant and expresses its trait, while the other allele is recessive and remains hidden in the presence of the dominant allele. The term "heterozygous" contrasts with "homozygous," where an individual has two identical alleles for a particular gene.

Thus, the ideal selection is option 2.

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Entropy change is typically 160.6 J/K.

ΔH°reaction=∑ΔH°f(reactants)+∑ΔH°f(reactants)

The entropy content of one mole of a pure substance at a standard condition of pressure and any desired temperature is known as the standard molar entropy in chemistry. These are frequently (but not always) used as the typical temperature and pressure.

Take an energy reading at a given temperature to calculate entropy. To quantify thermal energy transmitted (q) at a particular temperature, a calorimeter is typically used. Maintain the temperature value mathematically constant by assuming only extremely slight variations in the process's conditions.

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The formation of the crystalline NaCl lattice from sodium cations and chloride anions is highly exothermic and more than compensates for the endothermicity of the electron transfer process. In other words, the formation of ionic compounds isn't exothermic because sodium wants to lose electrons and chlorine wants to gain them; rather, it's exothermic because of the large amount of heat released when sodium and chlorine ions coalesce to form a crystal lattice.

To conduct nerve impulses, contract and relax muscles, and maintain the right ratio of water and minerals, the human body needs a modest quantity of sodium. For these essential processes, it is estimated that humans require 500 mg of sodium salt every day.

A nose, throat, and eyes might get irritated when exposed to low amounts of chlorine. At greater concentrations, breathing chlorine gas may alter respiratory patterns, cause coughing, and harm the lungs. Chlorine exposure might cause serious additional symptoms. Chlorine exposure may be harmful to workers.

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Since I2 was larger with more electrons, it has greater forces than N2, that is also nonpolar and only has London dispersion forces.

What is hydrogen used for?

Fuel cells may produce energy, power, and heat using hydrogen. The two industries where hydrogen is currently most widely employed are fertilizer manufacturing and petroleum refining, with the developing markets of utilities and transportation.

Can you drink hydrogen water?

Experts disagree whether consuming hydrogen water has any hazards. However, they were unsure if its advantages outweigh those of drinking regular water or being hydrated in general. Hypovolemia, which can be fatal, can result from excessive water intake.

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2.5 ml and 3 ml of solution, respectively, are needed to make the final concentration of.

Standard addition, internal standard, and external standard techniques to quantitation all employ calibration solutions. Calibrants can be made gravimetrically using reference standards or pure reference materials, but they can also be made on a volumetric or other fraction basis.

Calculate the volume of stock solution needed for each calibration standard by deciding on its number (minimum 5) and concentration. As often as necessary, repeat the treatment. Select and create the dilution solution (such as a matrix solution or 1% acid, for example). Both the working curve method and the standard addition method can be used to calibrate an instrument.

Calibration standard solution is the solution prepared of the known concentration for the plotting of standard curve.

For preparing the solution of known concentration and volume, the equation imputed is :

M1V1=M2V2

Where M1 and V1 are molarity and volume of known solution

M2 and V2 are molarity and volume of solution to be prepared.

Given, volume to be prepared V2 : 25 ml

concentration to be prepared : M_2:1×〖10〗^(-5) M

concentration of given solution : M_1:1×〖10〗^(-4) M

1×〖10〗^(-4)×V_1=1×〖10〗^(-5)×25

Volume of solution required is 2.5 ml.

The volume required to prepare 10 ml solution of 3×10-5 M is:

1×10-4×V1=3×10-5×10

Volume = 3 ml.

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Mole fraction for silver= 0.2317643/0.3079193

                                     = 0.7526787

Mole fraction for gold=0.076155/0.3079193

                                    =0.2473212

What is Molar Fraction?

The mole fraction is the product of the number of molecules of a specific component in a mixture and its total molecular weight. It serves as a means of indicating how concentrated a solution is.

It is a unit of concentration, defined as the product of the moles of a component and the moles of the entire solution. When all the parts of a solution are summed up, their mole fraction equals 1.

molar mass of silver = 107.8682g/mol

Molar mass of gold= 196.96657g/mol

Therefore mole = mass/molar mass

For silver: 25g/107.8682g/mol = 0.2317643mol

For gold: 15g/196.96657g/mol= 0.076155mol

Total number of mole= 0.2317643+0.076155

                                    = 0.30791193mol

Mole fraction for silver= 0.2317643/0.3079193

                                      = 0.7526787

Mole fraction for gold=0.076155/0.3079193

                                     =0.2473212

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SO₄⁻² (aq) + Ca⁺₂(aq) → CaSO₄(s)

CO₃⁻²(aq) + Cu⁺²(aq) → CuCO₃(s).

when you add sodium chloride to the solution, no precipitate forms. when you add sodium sulfate to the solution, a white precipitate forms. you filter off the precipitate and add sodium carbonate to the remaining solution, producing another precipitate.

When sodium chloride (NaCl) is added to the solution, sodium chloride  dissociates and forms the ions Na+ and Cl-. The anion can be form salts with the other cations presented in the solution. According to the solubility table of the salts, AgCl is a nonsoluble salt, and so, it was expected to form a precipitate. Perhaps, the concentration was not higher enough to do this.

When sodium sulfate (Na2SO4) is added, sodium sulfate dissociates and forms Na+ and SO₄⁻², the sulfate ion can react with the other cations. According to the solubility table, the salt CaSO4 (Ca is from group 2) is nonsoluble, so it will be formed. The net ionic equation represents the ions in solution that reacts:

Na⁺(aq) + SO₄⁻² (aq) + Ca⁺₂(aq) → Na⁺(aq) + CaSO₄(s)

SO₄⁻² (aq) + Ca⁺₂(aq) → CaSO₄(s)

When sodium carbonate (Na2CO3) is added, it dissociates and forms Na+ and CO₃⁻². According to the solubility table, the salt CuCO₃ is nonsoluble and will form a precipitate:

Na⁺(aq) + CO₃⁻²(aq) + Cu⁺²(aq) → Na⁺(aq) + CuCO₃(s)

CO₃⁻²(aq) + Cu⁺²(aq) → CuCO₃(s)

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A process employed entropy was 160.6 J/mol*K again for decomposition if 1 mol calcium calcite to dioxide and white precipitated oxide at 25 °C.

One or more substances—known as reactants—are transformed into one or more other substances—known as products—in a chemical reaction. Substances are composed up of chemical components or chemical elements.

The five basic types of chemical processes are synthesis, breakdown, one, double replacement, and combustion. By analyzing both reactants and products, you can assign a reaction to one of these categories.

CaCO3(s) → CaO (s) + CO2 (g)

ΔS° = (1 mol) [ΔS° for CaO (s)] + (1 mol) [ΔS° for CO2(g)] – (1 mol)[ΔS° for CaCO3(s)]

= (1 mol) (39.8 J/mol K) + (1 mol) (213.7 J/mol K) – (1 mol) (92.9 J/mol K)

= 160.6 J/K

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The parameters held constant in Experiment 1 are pressure and number of moles. The parameters held constant in Experiment 2 are temperature and number of moles.

What is apparent molecular weight of air?

The sum of the products of the mole fractions of each component times the molecular weight of that component is defined as apparent molecular weight.

What is pressure and temperature?

The force of all gas particle/wall collisions divided by the area of the wall is defined as pressure (P): Pressure is one of the primary observable quantities of this phase of matter; it is exerted by all gases.

Temperature is a measure of how hot or cold something is represented in terms of one of several scales, including Fahrenheit and Celsius. The direction in which heat energy will spontaneously flow is indicated by temperature.

The parameters held constant in Experiment 1 are pressure and number of moles. The parameters held constant in Experiment 2 are temperature and number of moles.

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Compound              Ionic or Covalent                  Formula

sodium oxide          Ionic                                     Na2O                                      

iron(III) bromide        Ionic                                    FeBr3                                  

sodium carbonate       Ionic                                 Na2CO3                                  

carbon tetrachloride     covalent                         CCl4                                  

nitrogen tribromide      covalent                            NBr3

Ionic bonds, which occur when two negatively charged ions join forces with positively charged ones, are formed when one atom transfers electrons to the other. Ionic bonds may be seen in the chemical compound sodium chloride.

A: The oxygen molecule is held together by two covalent bonds because the two oxygen atoms share two pairs of electrons. Two atoms, in this case oxygen and hydrogen, share electrons to form covalent bonds. Each end of the V-shaped H2O molecule assumes a slightly different charge as a result of the uneven attraction of oxygen and hydrogen to the shared electrons.

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The exchange capacity of an anion-exchange resin can be measured using a titration method. First, a known weight of the resin is weighed out and suspended in a buffered solution of a known pH.

The resin is then titrated with a standard solution of either sodium hydroxide (NaOH) or hydrochloric acid (HCl) until the pH of the solution reaches a predetermined endpoint. The amount of titrant added during the titration is then used to calculate the moles of charged sites per gram of dry resin.

To calculate the exchange capacity, the following equation can be used:

Exchange Capacity (mol/g dry resin) = (mol titrant added) / (g dry resin)

The mol titrant added is determined from the titration curve, which is constructed by measuring the pH of the solution versus the volume of titrant added. The endpoint of the titration is typically assumed when the pH of the solution reaches a predetermined value.

To ensure accuracy, the titration should be repeated at least three times and the average of the results should be taken. This will ensure that the exchange capacity measured is an accurate representation of the resin.

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The structure of the phosphite anion is a "T" shaped structure as it contains three oxygen atoms one with double bond with the phosphate atom.

Anion is a negatively charged ion that attracts the anode in electrolyte solution. The phosphite anion contains three oxygen atoms with one of them having double bond with the phosphate atom.

   According to Lewis structure the phosphite anion would be a "T" shaped structure. As we know, Lewis structure gives us the idea of how many electrons are donated or shared in order to form a covalent bond.

    Lewis structures, also known as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, are diagrams that show the bonding between atoms of a molecule, as well as the lone pairs of electrons that may exist in the molecule.

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Answer: b

Explanation:

Na2so3 is the empirical formula for a compound that, by mass, contains 29% NA, 41% S, and 30%.

The empirical formula of a chemical compound in chemistry is the simplest whole number ratio of atoms in a compound. Two simple examples of this concept are the empirical formulas of sulfur monoxide, SO, and disulfur dioxide, S2O2. An empirical formula is a compound's chemical formula that only specifies the ratios of the elements it contains and not the precise number or arrangement of atoms. This would be the compound's element with the lowest whole number ratio.

1. To solve an empirical formula problem, you must first determine the mass percentage of the constituent constituents.

2. Next, convert the percentage to grams.

3. Subtract each mass from its corresponding molar mass.

4. Select the moles answer that is the smallest and divide all numbers by that.

1. Change every percentage to grams.

29% Na = 0.29g

41% S = 0.41 g S

30% O = 0.30 g O

2. Change every amount to moles.

0.29 g Na = 0.01261… moles Na

0.41 g S = 0.01278… moles S

0.30 g O = 0.01875 moles O

3. Divide each mole by the smallest one, then roughly

0.01261 mol Na /0.01261 approximately 1

0.001278 mol S/0.01261 approximately 1(rounded from 1.01348…)

0.01875 mol O/0.01261 approximately 1.5(rounded from 1.486915

4. Since one of the elements was rounded to a non-whole integer, we must multiply each element by 2 to obtain whole numbers.

Na: 1 * 2 = 2

S: 1 * 2 = 2

O: 1.5 * 2 = 3

5. Based on the numbers above, create the equation using subscripts for each element.

6. sodium thiosulfate (Na2S2O3)

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