Calculate the number of moles of He atoms present in 5.55 g of He.
2

Based on the number of atoms in 1 mole of a substance, the number of atoms in 1 mole of  K₂ZnO₂ is 3.01 * 10²⁴ atoms.

Atoms are the smallest particle of an element that can exist and still retain the properties of that element.

Atoms of elements take part in chemical reactions.

The number of atoms in a mole of a substance is equal to 6.03 * 10²³.

In 1 mole of the compound K₂ZnO₂:

there are 2 moles of K atoms = 6.03 * 10²³ * 2 atoms

there are 1 mole of Zn atoms =6.03 * 10²³ atoms

There are 2 moles of O atoms = 6.03 * 10²³ * 2 atoms

Total number of atoms in 1 mole of  K₂ZnO₂ = 3.01 * 10²⁴ atoms.

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Isotopes of elements having atomic number less than 20 and with a neutron to proton ratio of close to 1 are more likely to be stable.

What is an isotope?

Isotopes are two or more atom kinds that share the same atomic number (protons in the nucleus), placement in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of possessing a different quantities of neutrons in their nuclei. Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics. The atomic number of an atom is the sum of the number of protons in the nucleus and the number of electrons in a neutral (non-ionized) atom. The mass number of an atom is determined by the quantity of nucleons—both protons and neutrons—in its nucleus, and it varies for each isotope of a given element.

Isotopes of elements having atomic number less than 20 and with a neutron to proton ratio of close to 1 are more likely to be stable.

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Distillation is the separation of multiple liquids. it means the selective boiling and subsequent condensation of a component in a liquid mixture.

Distillation It is a separate technique that can be used either to increase the concentration of a particular component in a mixture or to obtain pure components from a mixture.

The process of distillation takes advantage of the difference in boiling points of the components in a liquid mixture by converting one of them into a gaseous state. Distillation is not a chemical reaction but can be considered a physical separation process.

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Answer:

the correct answer is 5

Explanation:

i just know

The relationship between process capability index, Cp and process capability ratio, Cr is given as Cp = 1/Cr.

In statistics, process capability index is used to measure the variations or changes that occur in a process.

In general, the it lies between the specification limits which are also held in check while performing the Process capability index.

As we know that different processes has different optimal situations which help us to contrast the processes and also help us to identify if the obtained results meet our expectations.

Simply put, Process capability index also called process capability ratio is a statistical measurement method to identify the possible variations in a process.

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The following were the goals of reconstruction is to reincorporate the south into the union, to establish the equality under law for African Americans, and to assist the African Americans in the transition from slavery to freedom.

In the reconstruction the period includes civil war and the southern states defeated confederation. reconstruction was basically period of political crisis . The major drawback is that the African American never be equal on economic equality with the whites.

Thus, The following were the goals of reconstruction is to reincorporate the south into the union, to establish the equality under law for African Americans, and to assist the African Americans in the transition from slavery to freedom.

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The data is provided as follows.

The evaporating dish's mass is 3.375 g.

total mass = mass of the solid sample plus the evaporating dish

Specifically, 26.719 g (Mass of solid sample + evaporating dish)

So, using the following formula, we can determine the mass of the solid sample.

mass of evaporating dish = (mass of evaporating dish - mass of solid sample)

= 26.719 g – 3.375 g

= 23.344 g

This leads us to the conclusion that his solid sample's mass must be 23.344 g.

A piece of glassware used in laboratories called an evaporating dish is used to evaporate solutions and supernatant liquids, sometimes to the point of melting.

The main significant distinction between an evaporating dish and a watch glass is that a watch glass typically lacks sides and rims and resembles a contact lens more in terms of shape. The reason behind the name of these objects is that they mimic the glass case of a wristwatch.

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Organic molecules form covalent bonds and inorganic compounds form ionic bonds.

The main interaction in ionic compounds is ionic bonding, a type of chemical bonding that involves the electrostatic attraction between two atoms or ions with dramatically different electronegativities.

A chemical link known as a covalent bond includes the sharing of electrons between atoms to generate electron pairs. Covalent bonding is the stable equilibrium of the forces of attraction and repulsion between atoms when they share electrons.

Inorganic compounds have ionic bonds. There is always an ion-dipole attraction when inorganic compounds are combined with water, meaning the ions are solvated (hydrated)

Covalent bonding is frequently seen in molecules containing carbon, usually known as organic compounds. The two atoms' common pair of electrons has now extended around their nucleus, resulting in the formation of a molecule.

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If the pressure of a gas is tripled and the absolute temperature of the gas is quadrupled then volume of the gas change is 4/3

Volume is the space occupied within the boundaries of an object in three dimensional space

Here the relationship between pressure volume and temprature can be expressed as

PV/T

And then

P₁V₁/T₁ = P₂V₂/T₂

So in this case P₁V₁T₁ are equal to 1 and have the pressure triple so that P₂ = 3 and the temprature quadrupled so that T₂ = 4 and then we have to calculate V₂ = ?

(1)(1)/1 = (3)V₂  /4

1 = 3/4 V₂

1(4/3) = (3/4) V₂ 4/3

V₂ = 4/3

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The Charlotte throws 5 darts and they all end up in the outer ring of the dart board is they are neither precise nor accurate.

Precise is defined as how close the measurement are with one another.  Accuracy is defined as how the measurement is close to the correct value.  if all the dart is close to each other but not on bullseye than it is high precise and low accurate. if the the dart are in the bullseyes and close to each other it is said to be high precise and high accurate.

Thus, The Charlotte throws 5 darts and they all end up in the outer ring of the dart board is they are neither precise nor accurate.

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A method for making pure crystal of magnesium chloride from magnesium and dilute hydrochloric acid can be done using filter paper.

For this method, use a filter paper and funnel.

As, magnesium chloride is in aqueous form, it will come out with the filtrate(solution).

take hydrochloric acid in beaker:

• Keep adding small pieces of magnesium ribbon, until magnesium is in excess

• filter using filter paper and funnel and filter excess magnesium

• pour the solution into evaporating basin

• and then heat using Bunsen burner

• leave it to crystallize

evaporate or  boil off the water

• then decant solution

• finally pat dry using filter paper.

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Carbon electrodes are changed frequently in electrolysis as the carbon in the carbon electrodes burns to give out Carbon-di-oxide.

Carbon electrodes are used in electrolysis to facilitate the transfer of electrons between the anode and the cathode. The carbon electrode is usually in the form of a rod or plate and is electrically connected to the anode.

The carbon electrode may also be used to help reduce the overall resistance of the electrolytic cell.

Carbon electrodes are used in electrolysis because they are chemically inert and have a high electrical conductivity.

However, carbon electrodes must be changed frequently because they become corroded and lose their electrical conductivity over time.

This is because carbon burns out in the Carbon electrodes to give out Carbon-di-oxide. That is why the carbon anodes should be changed frequently.

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Taking into account definition of percent yield, the percent yield of the reaction is 62.78%.

In first place, the balanced reaction is:

SiO₂(s) + 3 C(s) = SiC(s) + 2 CO(g)

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), 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 limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 44 grams of SiO₂ reacts with 36 grams of C, 50 grams of SiO₂ reacts with how much mass of C?

mass of C= (50 grams of SiO₂×36 grams of C)÷ 44 grams of SiO₂

mass of C= 40.91 grams

But 40.91 grams of C are not available, 40 grams are available. Since you have less mass than you need to react with 50 grams of SiO₂, C will be the limiting reagent.

The percent yield is the ratio of the actual return to the theoretical return expressed as a percentage.

The percent yield is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:

percent yield= (actual yield÷ theoretical yield)× 100%

where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product, that is, it is the maximum amount of product that could be formed from the given amounts of reagents.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 36 grams of C form 40 grams of SiC, 40 grams of C form how much mass of SiC?

mass of SiC= (40 grams of C×40 grams of SiC) ÷36 grams of C

mass of SiC= 44.44 grams

The theoretical yield of SiC is 44.44 grams.

In this case, you know:

Replacing in the definition of percent yield:

percent yield= (27.9 grams÷ 44.44 grams)× 100%

Solving:

percent yield= 62.78%

Finally, the percent yield is 62.78%.

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61.62 g of precipitate of AgCl is formed after the reaction is complete

As we know the formula :

M = n / V

where

M = Molarity

n= no of moles

V = volume ( in litres)

Concentration of NaCl = 1.527 M = 1.527 mol/L

Volume of NaCl solution = 97.19 ml = 97.19 /1000

= 0.09719 L

Number of moles of NaCl

= 1.527 mol/L × 0.09719 L

= 0.148 mol

Concentration of Ag2SO4 = 1.923M = 1.923 mol/L

Volume of Ag2SO4 solution = 111.84 ml = 111.84/1000

= 0.11184 L

Number of moles of Ag2SO4

= 1.923 mol/L × 0.11184 L

= 0.215 mol

Balanced equation:

Ag2SO4 (aq) + 2 NaCl (aq) -->2 AgCl (s) [precipitate] + Na2SO4 (aq)

1 mol of Ag2SO4 reacts with 2 moles of NaCl produces 2 moles of AgCl,

then 0.215 mols of Ag2SO4 will react with 2 × 0.215 moles = 0.43 moles of NaCl will produce 0.43 moles of AgCl

Molar mass of AgCl = 143.32 g/mol

Mass of precipitate formed = no of moles× molar mass

= 0.43 mol × 143.32 g/mol = 61.62 g

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A region of a polypeptide that folds in a particular way, relatively independently of the rest of the molecule, is a folding domain.

Thus, the correct option is E.

Domains as known tertiаry structures are the folding of the secondаry structure into distinct аrrаngements. The tertiаry structure of а protein describes the mаnner in which the secondаry structurаl elements аre аrrаnged in three dimensions to creаte а stаble moleculаr entity. In mаny cаses, it is convenient to describe а protein in terms of regions of the polypeptide chаin thаt might fold аutonomously. These regions аre cаlled domаins аnd much of the discussion of tertiаry structure centres on the clаssificаtion of these units of protein structure.

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Answer:

4

Explanation:

Having the coefficient 4 in front of HCl and the coefficient 2 in front of H₂O balances out the equation.

6.9×10^23 molecules of oxygen are produced when 43g of h2o decompose.

2H20⇆O2+2H2

given mass,H2O=43 g

molar mass H2O=18 g

moles=given mass/molar mass

moles=43/18

moles=2.3 mol

molecules of oxygen= 2.3/2=1.15 mol

molecules of oxygen=1.15 mol×6.022×10^23

molecules of oxygen=6.9×10^23 molecules.

The non-metallic chemical element oxygen is found in Group 16 of the periodic table, generally known as the oxygen group (O). All living creatures require the colorless, tasteless, and odorless gas known as oxygen. When plants use it as a source of carbon and release the oxygen back into the environment, plants utilise the carbon dioxide that animals have taken up and converted it into.

Oxygen may react with almost every other element to form compounds in addition to reactions that remove elements from their combinations with one another. Combustions are the name for these reactions, which are typically accompanied by the creation of heat and light. The most important component is water.

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The product formed in the Diels-Alder reaction is given below. It is a (4+2) addition and a cis-product is formed.

Two organizations in a molecule can be distinctive and, if changed, generate compounds that are stereoisomers. A magnetic interaction arises among two debris such as hydrogen nuclei with non-0 spin. when two enantiomers have exclusive charges of reaction. A not-unusual instance of a pair of enantiomers is dextro lactic acid and laevo lactic acid.

The definition of a stereoisomer is any of a group of isomers wherein atoms are linked inside the identical order but fluctuate in their spatial association. In stereoisomerism, the atoms making up the isomers are joined up inside the identical order, but nevertheless, control to have an exceptional spatial arrangement. Geometric isomerism is one form of stereoisomerism. these isomers arise when you have confined rotation someplace in a molecule.

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The subgame perfect Nash equilibrium is to hold elections to pursue the moderate policy.

A perfect Nash equilibrium for a subgame is usually derived from the game's various final outcomes by backward induction eliminating branches where each player makes incredible moves from that node. The main difference between subgame perfect equilibrium and Nash equilibrium is that subgame perfect equilibrium requires all threats to be reliable.

Therefore, the study of the perfect balance of subgames is a reliable threat study. Subgame perfect equilibria are a subset of Nash equilibria. A Nash equilibrium of an extended game is a subgame perfect equilibrium if every subgame induces a Nash equilibrium game. A Nash equilibrium in which no part of the player's strategy contains incredible threats or promises is called a complete subgame.

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Student 1 states that the molecules that are larger in size and are more attracted to the solvent will move further along the TLC plate employing the correct specific reasoning.

Why do some substances move further up the TLC plate than others?

Larger molecules take longer to move up the chromatography paper or TLC plate, whereas smaller molecules are more mobile. Likewise, the polarity of the molecules can affect how far the spots travel, depending on the type of solvent used.

What factor determines which molecules travel further in chromatography?

The stronger a compound is bound to the adsorbent, the slower it moves up the TLC plate. Non-polar compounds move up the plate most rapidly (higher Rf value), whereas polar substances travel up the TLC plate slowly or not at all (lower Rf value).

Thus, the molecules larger in size are more attracted to solvent will move further along the TLC plate is the reason why molecules move further than others in a chromatogram. So, student 1 is the correct option.

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Answer:

a producer is an organisms that produce food for themselves and other organisms.

To solve the stoichiometry problems we need the amount of reactants given in mole and the product is sought in mole. We use  it because then all we have to do is the mole ratio from the balanced chemical equation  to solve the problem

The option B is correct.

What do you mean by Stoichiometry ?

Stoichiometry can be defined as  the quantitative relationships or ratios between two or more substances undergoing a physical change or chemical change. Jeremias Benjaim Richter defined stoichiometry in 1792 as the science of measuring quantities or mass ratios of chemical elements. It is the study of mass relations

It can be analyzed by

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The coffee's pH will be 10.

What does pH refer to?

because hydrogen ions attach to water molecules for form hydronium ions.

To calculate the pH of a solution, use the equation

pH = − log [H3O+]

Since we are given the hydronium ion (H3O+) concentration of the solution, we can plug this value into the formula.

pH = −log[ 1.00 × 10^−10M]

pH = 10

Hence, The pH of this solution is 10

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All of the energy stored or applied on a body cannot be converted tono work done only the available form of energy is converted to work. The remaining part is called unavailable energy which is stored on the body or taken as increase in entropy.

According to thermodynamic concepts, the not all the energy can be converted into useful work .Or in other words only available energy can be converted to work. This available form of energy is called Gibbs energy.

For instance if we take a heat engine, the heat from the hot body is not completely transferred into colder body. According  to third law of thermodynamics, this unavailable work is being considered as gone for increase in entropy.

Therefore, only available energy of the electric drill can be changed to work done and that is 222 J out of 1000 J, remaining goes for an increase in entropy of the system.

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The molarity when a student dissolves of resveratrol in of a solvent with a density of . the student notices that the volume of the solvent does not change when the resveratrol dissolves in it is 0.185 M and 0.3645 g

As we know the formula of Resveratrol

C14H12O3

We know the molar mass is 228 g/mol

Mole of resveratol is 19/228=0.083 g

So, the molarity of the Solution is 0.083/0.45=0.185 L

Now as we know molality mole of the solute mass of solvent

volume of solvent = 450 ml

Molality is the mass of solute upon the mass of solvent

M=0.81X450=0.3645 kg

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The required heat in this case id 68J

Aluminum is an element with the atomic symbol Al, and the atomic number of this element is 13 in the periodic table. Aluminum is weaker than steel, and also it is less dense than steel.

specific heat, is the quantity of heat required to raise the temperature of one gram of a substance by one  degree celsius. The units of specific heat are usually calories or joules per gram per Celsius degree.

When there is change of heat the expression used will be;

Q = mCΔT

Where m = 5 grams, ΔT = 37[tex]^oC[/tex] - 22[tex]^oC[/tex] ⇒ 15[tex]^oC[/tex], C = 0.900J

Q = 5 × 0.900 × 15

= 68 J

Therefore the required heat in this case is 68J

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Answer: (0.800g BaCl2) / (208.233g BaCl2/mol) =

0.00384 mol BaCl2

Explanation: Hope this helps :)

The number of moles of anhydrous barium chloride is equal to 3.84 ×10⁻³ mol and the number of moles of water is equal to 7.78 ×10⁻³ mol.

A mole can be described as a standard unit that is used to determine the number of atoms, molecules, ions, or other particular particles in the given mass of the substance. The mass of one mole of any chemical element is known as atomic mass and that of any chemical compound is called the molar mass of that compound.

Given the chemical reaction of decomposition of barium chloride:

[tex]BaCl_2.2H_2O\longrightarrow BaCl_2 +2H_2O[/tex]

Given the mass of the hydrated barium chloride = 0.940 g

The mass of the anhydrous  barium chloride = 0.800 g

The molar mass of the anhydrous barium chloride = 208.23 g/mol

The number of moles (n) of anhydrous barium chloride = 0.800/208.23

n = 3.84 ×10⁻³ mol

The mass of the water = Mass of hydrated barium chloride - anhydrous barium chloride

Mass of water = 0.940 -0.800 = 0.14 g

The number of moles of water = 0.14/18 = 7.78 ×10⁻³ mol

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The major organic product formed in the reaction of 1−methylcyclohexene with bromine in water is attached as a picture.

A reaction mechanism is a representation of step by step transfer of electrons and molecules from one compound to another compound. In reaction mechanisms, the curved arrows show the moment of electrons.

In the reaction mechanism of 1-methyl cyclohexene the double bond of 1-methyl cyclohexene act as an attacking group and attacks Br2. As a result, one Br atom gets attached to 1-methyl cyclohexene. This results in a carbocation generation on the carbon having the methyl group. This carbon cation then attacks the oxygen of water molecules and the organic product (1S,2S)-2-bromo-1-methylcyclohexan-1-ol will generates as the major product.

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