Element X is a solid at room temperature.
It needs one electron per atom to gain the electronic structure of a noble gas.
It is the least reactive element in its group.
What is the element X?

1.At
2.Cs
3. F
4. Li​

True. The statement is true as a unit cell encapsulates the essential features and symmetry of the crystalline lattice and is repeated to form the complete lattice structure.

A unit cell is defined as the smallest repeating unit of a crystal lattice that, when repeated in three-dimensional space, generates the entire lattice structure. It represents the fundamental building block of the crystal lattice and contains all the structural information needed to describe the crystal. By translating the unit cell in three dimensions, the complete crystal lattice can be constructed.

The concept of a unit cell is fundamental in crystallography and is used to study and understand the arrangement and properties of crystalline materials. Different types of unit cells, such as cubic, tetragonal, and hexagonal, exist depending on the symmetry and arrangement of the lattice.

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The pair of isotopes is O 16 and O 18.

An isotope is a chemical element that has the same number of protons in the nucleus but a different number of neutrons. This gives them a different atomic weight. For example, carbon-12, carbon-13, and carbon-14 are isotopes of carbon.

The given options, OHH 32, s. 32 5-2 16 16 O02, 03 O14 C, LAN N, do not match the criteria to be isotopes of each other. OHH32 is not an element, while s. 325-2 is an ion. O02 and O03 are isotopes of oxygen but have different atomic numbers. Lastly, 14C and LAN N are not the isotopes of each other because they are from different elements.

Thus, the correct pair of isotopes is O16 and O18.

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Answer:

June 20

Explanation:

The rate constant at 366K is 0.58 s⁻¹.

Ea = 108 kJ/mol = 108000 J/mol; an activation energy of a reaction

T₁ = 275 K

k₁ = 4.60 × 10⁻⁶ 1/s; the rate constant at 275 K

T₂ = 366 K

R = 8.314 J/Kmol

k₂ = ?; the rate constant at 366 K

Arrhenius equation: ln(k₁/k₂) = Ea/R (1/T₂ - 1/T₁)

ln(4.60 × 10⁻⁶s⁻¹/k₂) = 108000 J/mol/8.314 J/Kmol × (1/366K - 1/275K)

k₂ = 0.58 s⁻¹

For all chemical reaction some energy is required and that energy is called activation energy (energy that needs to be absorbed for a chemical reaction to start).

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A hammer strikes a compound formed by covalent bonds, It will break into many pieces. Therefore, option A is correct.

An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs. Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.

Atoms join together in a covalent bond by exchanging electrons. Nonmetals typically form covalent connections with one another. For instance, each hydrogen (H) and oxygen (O) atom in water (H2O) shares a pair of electrons to form the molecule of two single-bonded hydrogen atoms and one single-bonded oxygen atom.

Thus, option A is correct.

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When the reaction is subjected to pressure, the equilibrium will shift to the side with fewer gas molecules, which is the left side. Therefore, the answer is c. left.

According to Le Chatelier's principle, when a system at equilibrium is subjected to a change in pressure, it will respond by shifting in a way that reduces the effect of the change. In this case, increasing the pressure would cause the equilibrium to shift towards the side with fewer gas molecules to alleviate the increase in pressure.

Since there are fewer gas molecules on the left side of the reaction (2 CO + O2), the equilibrium will shift to the left to reduce the total number of gas molecules. This means that the concentrations of CO and O2 will increase, while the concentration of CO2 will decrease until a new equilibrium is established. Thus, the equilibrium will shift to the left.

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Answer:

Explanation:

In an ecosystem, the introduction of white moths will impact the grey moths as there will be an increase in competition for the resources.

Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.

Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.

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There are several problems that may impede a geneticist's ability to identify the mutation responsible for a disease:

Genetic heterogeneity: In many cases, a single disease can be caused by mutations in different genes. This is known as genetic heterogeneity and can make it difficult to identify the specific gene responsible for the disease.

Genetic modifiers: Some diseases may be caused by mutations in a single gene, but the severity of the disease may be influenced by other genetic factors. These genetic modifiers can complicate the identification of the primary disease-causing mutation.

Limited availability of samples: Geneticists often require large numbers of samples to identify disease-causing mutations. If samples are limited or difficult to obtain, this can impede the identification process.

Genetic complexity: Some diseases may be caused by mutations in multiple genes or by non-coding DNA sequences. These types of genetic complexities can make it difficult to identify the specific mutation responsible for the disease.

Difficulty in interpreting genetic data: Genetic data can be complex and difficult to interpret. Even with sophisticated analytical tools, it can be challenging to determine which genetic variants are responsible for a disease.

Variability in disease presentation: Some diseases may present differently in different individuals, even if they are caused by the same genetic mutation. This variability can complicate the identification of disease-causing mutations.

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Answer:

Tara does not think that Victor’s predictions are likely.

Explanation:

In order to submit the paper, he would need to be as accurate as he possible can, is Tara told him to do it again, it means that he may have made a few mistakes.

The concentration of NH3 at equillibirium is 0.00010M. Option A.

Ammonium nitrate is formed when nitric acid reacts with ammonia. It is a white crystalline solid consisting of ammonium ions and nitrate ions. Soluble in water, but does not form hydrates. Ammonia is directly neutralized with sulfuric acid to produce ammonium sulfate.

The neutralization evaporator and crystallizer are connected so that the heat released during neutralization is used to evaporate the water in the ammonium sulfate slurry. These units operate under partial vacuum. Nitric acid pH neutralization is common and any inorganic base such as sodium hydroxide or lime can be used. Ammonia gas reacts with hydrogen chloride gas to form ammonium chloride.

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The mass of the cube of iron with a side length of 55.0 mm is approximately 1313.6125 grams.

To calculate the mass of a cube of iron, we need to know the density of iron and the length of one side of the cube. Given that the density of iron is 7.9 g/cm^3 and the length of one side of the cube is 55.0 mm, we can proceed with the calculation. First, we need to convert the length of one side from millimeters (mm) to centimeters (cm) since the density is given in grams per cubic centimeter. We divide 55.0 mm by 10 to obtain 5.5 cm.

Next, we can calculate the volume of the cube using the formula V = (side length)^3. Substituting the value of 5.5 cm into the formula, we get V = (5.5 cm)^3 = 166.375 cm^3. Finally, we can calculate the mass of the cube using the formula mass = density × volume. Substituting the values of density (7.9 g/cm^3) and volume (166.375 cm^3), we get mass = 7.9 g/cm^3 × 166.375 cm^3 = 1313.6125 g.

In summary, to calculate the mass of the iron cube, we convert the length from millimeters to centimeters, calculate the volume of the cube, and then multiply it by the density of iron. The resulting mass is approximately 1313.6125 grams.

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Based on stoichiometry and the ideal gas law, approximately 0.143 L of H₂S gas is needed to make 14.0 g of S.

To determine the volume of H₂S gas needed to produce 14.0 g of S, we need to use stoichiometry and the ideal gas law.

The balanced equation for the reaction between H₂S and SO₂ to produce S is:

H₂S + 2 SO₂ -> 3 S + 2 H₂O

From the balanced equation, we can see that 1 mole of H₂S produces 3 moles of S.

First, we need to calculate the number of moles of S produced from 14.0 g of S:

Molar mass of S = 32.06 g/mol

Number of moles of S = 14.0 g / 32.06 g/mol = 0.436 mol

Since 1 mole of H₂S produces 3 moles of S, we can calculate the number of moles of H₂S needed:

Number of moles of H₂S = 0.436 mol / 3 mol = 0.145 mol

Next, we can use the ideal gas law to find the volume of H₂S gas:

PV = nRT

Where:

P = pressure = 725 torr

V = volume (unknown)

n = number of moles of H₂S = 0.145 mol

R = ideal gas constant = 0.0821 L·atm/(mol·K)

T = temperature = 225 K

Rearranging the equation to solve for V:

V = (nRT) / P

Substituting the values:

V = (0.145 mol * 0.0821 L·atm/(mol·K) * 225 K) / 725 torr

Converting torr to atm (1 atm = 760 torr):

V = (0.145 mol * 0.0821 L·atm/(mol·K) * 225 K) / (725 torr / 760 torr/atm)

Calculating the volume:

V = 0.143 L

Therefore, the volume of H₂S gas needed to produce 14.0 g of S is approximately 0.143 L.

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Answer:

D

Explanation:

The temperature increases

The pH of the aqueous solution can be calculated by considering the acid dissociation constants of both Nao2 and Ca(NO2)2. The acid dissociation constant of NaNO2 is negligible in comparison to the acid dissociation constant of Ca(NO2)2 which is 4.5*10-4.

The pH of the solution can be calculated using the Henderson-Hasselbalch equation which states that the pH of a solution is equal to the pKa of the acid plus the logarithm of the ratio of [Molecule]/[Conjugate base].

In this case, the pH of the solution can be calculated by taking into account the dissociation of Ca(NO2)2 in the solution. The pH of the solution is 2.43. This is because the ratio of [NaNO2]/[Ca(NO2)2] is 0.1:0.2 and the pKa of Ca(NO2)2 is 4.5*10-4. Thus, the pH of the solution is 2.43.

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Answer:

When a body covers equal distances in a straight line, equal intervals of time are called uniform motion

When a body covers unequal distance in equal intervals of time in a straight line is called non-uniform

Answer:

Uniform motion- is motion in which the

velocity does not change.

Non-uniform motion-occurs when the velocity of an object is not

constant : the object speeds up or slows down during its motion, or changes direction.

Hope it will help you !!

The sp2 hybridized carbons have shorter and stronger bonds than the sp3 hybridized carbon atoms.

A dihalide is an organic compound that contains two halogen atoms that are located on different carbon atoms hence they can be eliminated during dehydrohalogenation reactions.

We must note that it is more difficult to form an alkyne from a dihalide because the sp2 hybridized carbons have shorter and stronger bonds than the sp3 hybridized carbon atoms.

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Answer:  No, the samples are not of equal masses.

Explanation:  Mass is volume X density

A:  (2ml)*(18.4g/ml) = 36.8 g

B:  (5ml(*(35.5g/ml) = 177.5 g

The work done (in J) in compressing a gas at constant temperature is calculated using the formula: W = -PΔV, where W is work done, P is the external pressure and ΔV is the change in volume.

Here, ΔV = Vf - Vi = 2.95 L - 6.63 L = -3.68 L [negative sign because of compression] and P = 735 torr. First, we need to convert the pressure to atm (1 atm = 760 torr):735 torr / 760 torr/atm = 0.967 atm Now, substituting these values in the above formula, we get: W = -(0.967 atm)(-3.68 L) = 3.55256 L atm Converting L atm to J (1 L atm = 101.3 J):W = (3.55256 L atm)(101.3 J/L atm) = 359.52 J

Therefore, the work done in compressing the gas at constant temperature from a volume of 6.63 L to a volume of 2.95 liters by an external pressure of 735 torr is 359.52 J.

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It has 8 valence electrons.

The valence electrons in each family of elements are:

Boron, Carbon, and Neon are elements that belong to different families.

Boron and Carbon are members of the Carbon family, while Neon is part of the Noble gas family.

They have a varying number of valence electrons.Boron has three valence electrons in its outermost shell.

Carbon has four valence electrons in its outermost shell.

Neon has eight valence electrons in its outermost shell.

Hence, the number of valence electrons in Boron, Carbon, and Neon are 3, 4, and 8, respectively.

Also, we can say that each family of elements has a specific number of valence electrons that help to determine their chemical and physical properties.

The number of valence electrons can be easily found using the Group number of the element in the periodic table.

The Group number of an element represents the number of valence electrons an element has.

For example, Boron and Carbon are present in Group 13 and Group 14, respectively, which means they have 3 and 4 valence electrons.

Neon, on the other hand, is present in Group 18, and it has 8 valence electrons.

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The Gibbs free energy change (ΔG) can be calculated using the formula ΔG° = -RTlnK, the value of ΔG for the reaction at 25°C is approximately -4.83 kJ/mol.

Value of K is 20.2, and the temperature is 25°C or 298 K. Thus, we can calculate the standard Gibbs free energy change (ΔG°) as follows:ΔG° = -RTlnK= -(8.314 J/mol K)(298 K)ln(20.2)= -35,380.2 J/mol≈ -35.4 kJ/mol We can also calculate the Gibbs free energy change (ΔG) at non-standard conditions using the formula ΔG = ΔG° + RTln(Q), where Q is the reaction quotient.

The given reaction is A(g) ⇌ 2B(g), and the value of ΔG° is +5.44 kJ/mol. The reaction quotient Q can be calculated using the partial pressures of A and B as follows: Q = (PA) / (PB)2= (2.50 atm) / (5.70 atm)2≈ 0.15Substituting these values into the formula for ΔG gives:ΔG = ΔG° + RTln(Q)= (+5.44 kJ/mol) + (8.314 J/mol K)(298 K)ln(0.15)= -4,828.2 J/mol≈ -4.83 kJ/mol.

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An element can have multiple isotopes. Isotopes correspond to variations of the same element with respect to the number of neutrons in its nucleus. the number they give us, 35 and 37 correspond to the mass number of chlorine. The percentage will be how abundant the element is.

To find the average atomic mass we must multiply the mass of the isotope by its respective percentage of abundance and add these two results.

So, the average atomic mass of Cl will be:

Answer: the average atomic mass of chlorine is 35.454 amu

The synthesis of nylon requires solutions of 5% hexamethylenediamine and 5% adipoyl chloride. This polymer will form between layers of the solutions. To remove the nylon, one can choose to dissolve it in the 5% hexamethylenediamine or in the 5% adipoyl chloride.

Nylon, a synthetic polymer, is produced from the combination of adipoyl chloride and hexamethylenediamine. This process is called the synthesis of nylon. Nylon is a highly flexible material that is resistant to wear and tear, as well as chemical and heat degradation. The synthesis of nylon requires solutions of 5% hexamethylenediamine and 5% adipoyl chloride, respectively, for the two reactants to be mixed together.

The reaction between these two chemicals is exothermic, which means that it releases heat. The heat generated in the reaction drives the reaction forward, resulting in the formation of nylon. The chemical formula for nylon is (-CO-NH-)n, where n is a large number that reflects the degree of polymerization. To remove the nylon, it is soaked in an acid solution. The acid dissolves the nylon, separating it into its constituent components, which can then be purified and reused.

The most commonly used acid for this process is hydrochloric acid. The process of removing nylon from its solvent is called the "acid-catalyzed hydrolysis of nylon." Nylon is used in a variety of applications, including textiles, packaging materials, and electrical components, among others. Its properties make it ideal for use in applications that require durability, strength, and flexibility. Nylon's physical properties, including its resistance to heat and chemical degradation, make it ideal for use in applications such as electrical insulation, packaging materials, and textiles.

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The molar mass of CCl₄ is 154 g/mol

Molar mass is the mass in grams of one mole of a substance and is given by the unit g/mol.

It is calculated by taking the sum of atomic masses of all the elements present in the given formula.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Atomic mass of C = 12

Atomic mass of Cl = 35.5

Molar mass = 12 + (35.5 × 4)

= 154 g/mol

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Biodiesel is indeed an alkylester (RCOOR') obtained from fat, and it possesses combustion characteristics similar to diesel fuel. However, biodiesel is known to be more stable, non-toxic, and less susceptible to microbial decomposition due to its relatively high flash point.

Biodiesel is produced through a chemical process called transesterification, where fats or vegetable oils are reacted with an alcohol (usually methanol or ethanol) in the presence of a catalyst, such as sodium hydroxide or potassium hydroxide.

This reaction results in the formation of alkyl esters, which are the main components of biodiesel.

The combustion characteristics of biodiesel are similar to those of conventional diesel fuel, which make it a suitable alternative for diesel engines without requiring significant engine modifications.

Biodiesel has a higher flash point compared to petroleum diesel, meaning it requires a higher temperature to ignite. This property enhances safety and reduces the risk of accidental fires.

Furthermore, biodiesel is considered stable because it has a lower propensity to degrade or oxidize over time compared to conventional diesel fuel. This stability ensures that biodiesel can be stored for longer periods without significant deterioration in quality.

Biodiesel is also recognized for its non-toxic nature. It is biodegradable and poses fewer health risks than petroleum-based diesel fuel. In case of a spill or leakage, biodiesel can be less harmful to the environment and human health.

In summary, biodiesel is an alkylester obtained from fat through the transesterification process. It exhibits combustion characteristics similar to diesel fuel but offers several advantages, including stability, non-toxicity, and a relatively high flash point.

These properties make biodiesel a viable and environmentally friendly alternative to petroleum diesel fuel, contributing to the diversification of energy sources and reducing the environmental impact associated with traditional fossil fuels.

CH₂-OCOR¹ CH-OCOR² + 3CH₂OH CH- CH₂-OCOR³ Triglyceride Methanol A + 3M Catalyst CH₂OH R¹COOCH3 CHOH + R³COOCH3 CH₂OH R³COOCH3 Glycerol Methyl esters G + 3P Triglyceride + R¹OH Diglyceride + R¹OH Monoglyceride + R¹OH Diglyceride + RCOOR¹ Monoglyceride + RCOOR¹ Glycerol + RCOOR¹ A+MB+P [1] B+MC+P [2] C+M G+P [3] temp (°C) 45 55 65 time (min) 5 0.94 0.89 0.80 10 0.89 0.81 0.67 15 0.84 0.74 0.57 20 0.80 0.67 0.50 25 0.76 0.63 0.45 30 0.73 0.58 0.40 tem(C) 45 55 65 60 rate constant (L/(mol min)) kl k2 Obtained from question 0.0255 Obtained from question 0.0510 Obtained from question 0.0965 Obtained from question ? k3 0.0881 0.141 0.218 ?

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Answer:

independent: amount of baking powder

dependent: the banana bread that it produces

constants: the amount of other ingredients/the other ingredients, the type of baking powder, rest of the baking process (heat, temperature, timing of steps), and who's tasting the bread.

Explanation:

The independent variable is the thing that we are directly changing.

We usually change this to test out differences between different amounts of this variable;

This variable is the "x" variable in a function or graph, if it helps you to think of it as that.

The dependent variable is the thing that changes because of the independent variable

Once again, if you think of a graph or function, this would be the "y" variable--it changes in relation to x

The constants are the things that stay the same no matter what the changing variables are

This element is key to an experiment--an experiment would be almost pointless without it. We need to see what is actually changing as a result of the independent and intentional changes.

Here's an example:

Let's say I want to test out how much condensation forms on a bottle based on the temperature of the liquid inside.

I will be changing the temperature of the liquid inside, meaning that this is the independent variable

I will be expecting/looking for a change in the condensation because of my change in the independent variable, meaning that this is the dependent variable

In my experiment, there are some things I need to make sure don't change, so that I can see the effect of my change in the temperature directly--perhaps I need to keep the same bottle shape and size, the same amount of liquid, the same location, the same type of liquid, the same amount of time I let it sit for, etc.  meaning that these are my constants.

So, with all of this in mind, let's take a look at our experiment given.

Here, I will be changing the amount of baking powder that I use, whilst observing the change in the banana bread that it directly produces.

There are a few things I must keep constant: the amount of the other ingredients, the rest of the baking process (heat/temperature, mixing time, etc.), and the type of baking powder I use

There is another consideration that I probably want to keep consistent: who is deciding the taste of the bread. If the person switches, then I might get a different opinion for the same recipe.

hope this helps! have a lovely day :)

Option 2 involves conducting an experiment to find the ideal amount of baking powder to add to a batch of banana bread.

The amount of baking powder served as the independent variable. The goal of this experiment is to determine the ideal amount of baking powder to use in each batch of banana bread.

Dependent Variable: The standard of banana bread served as the dependent variable. It is called the outcome you are measuring or observing in response to a change in the independent variable. In this instance it could be the taste, texture or texture of banana bread.

Constant: Some variables must remain constant throughout the experiment to ensure that only the independent variable has an effect on the dependent variable. Following are some possible constants in this experiment:

By holding these variables constant, you can isolate the effect of different amounts of baking powder on the quality of the banana bread and determine the exact amount needed for best results.

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Among the bond ratings provided, Baa1 has the highest yield. The bond ratings provided are based on the creditworthiness and risk associated with the issuer.

Generally, higher-yielding bonds indicate higher risk, which is reflected in lower credit ratings. Baa2, Baa3, and BBB all have lower credit ratings compared to Baa1, indicating a higher level of risk and, therefore, potentially higher yields. Key Learnings. Junk bonds, often known as high-yield bonds, are corporate financial securities that provide interest rates above those of investment-grade bonds. Low credit ratings, such as below BBB- from Standard & Poor's and Fitch or below Baa3 from Moody's, are typical of high-yield bonds.

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The negative radicals will be  \(Cl^-\), \(HCO^-\), \(CO_3^2^-\), and \(OH^-\) respectively.

They are the species that are negatively charged in ion forms.

\(NaCl --- > Na^+ + Cl^-\)

\(NaHCO --- > Na^+ + HCO^-\)

\(Na_2CO_3 --- > 2Na^+ + CO_3^2^-\)

\(Ca(OH)_2 -- > Ca^2^+ + 2OH^-\)

Thus, the negative radicals in each of the chemicals are \(Cl^-\), \(HCO^-\), \(CO_3^2^-\), and \(OH^-\) respectively.

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The negative radicals as as follows;

The negative radicals are the radicals that are negatively charged. Every ionic compound is composed of positively and negatively charged ions.

Let us now identify the negative radicals in the following ionic compounds;

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According to the question, the cell potential is 0.058V of the given galvanic cell.

In an electrochemical cell, the potential difference between two half-cells is measured by the cell potential or Ecell. Because electrons can move easily between one-half cell and the other, there is a potential difference. Because the chemical reaction is a redox reaction, electrons can travel freely between electrodes. Redox reactions happen when one chemical is reduced while another is oxidized. The substance undergoes oxidation, which results in the loss of one or more electrons, making it positively charged. In contrast, when a substance is reduced, it picks up electrons and becomes negatively charged.

According to the question,

By using the Nernst equation,

E(cell) = E(oxidation potential) + E(reduction potential)

E(Cell) = 0.037+0.021

           = 0.058 V

Hence, the cell potential is 0.058 V.

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