Ordinary hydrogen contains 99.30% of H atoms and 0.70% H atoms. Calculate the relative atomic mass of hydrogen.​

The following statements that are true about electron dot structures and valence electron include the following below:

This is referred to as a subatomic particle which has a negative charge and is involved in chemical reactions.

Atoms can gain and lose electrons so as to attain a stable octet configuration which is therefore the reason why stable atoms will always have eight valence electron and a full outer shell.

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Water dissolves crystalline table salt (nacl). because there are more particles, entropy —-select—-. (Choice A).

When a neutral atmosphere is required, argon is frequently employed. In this manner, titanium as well as other reactive elements are produced. Additionally, it is used in incandescent bulbs to prevent oxygen from disintegrating the filament and by welders can protect the weld region.

Higher concentrations might result in nausea, vomiting, disorientation, coma, and even death. For argon, no occupational exposure levels have been set. But there might be a health risk involved. Always adhere to safe work procedures.

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2.67 L volume is occupied by 0.105 mol of helium gas at a pressure of 0.95 atm and a temperature of 295 k

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

Here given data is

Pressure = 0.95 atm

Temprature =  295 k

Number of mole of He gas =  0.105 mol

R = 0.0821 L.atm.K⁻¹mol⁻¹ = gas constant

We have to calculate volume = ?

So according to the ideal gas equation

PV = nRT

V = nRT/P

V = 0.105 mol × 0.0821 L.atm.K⁻¹mol⁻¹ × 295 k/0.95 atm

V = 2.67 L

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Currently, it is being treated with hcl, and 18.5 ml of SCL will be required to treat the tribulation. Additionally, 0.1 Molar is provided to us as the Excel solution's modularity. We must now ascertain the energy concentration that was ingested into the beaker.

Therefore, we shall use the following formula: concentration times volume equals the concentration of HCL times volume. In order to get the answer, we will now substitute all the values. This applies to any that mentions "sparks at cl" Therefore, the quantity to be determined is 100 ml, which is equivalent to 18.5 times 0.1 molar. then from here Any initially present substance has a concentration of 0.0185. Thus, this is the solution.

Subtract the solute's mass from the solution's overall volume. C = m/V, where m is the solute's mass and V is the entire volume of the solution, should be written down. Input the mass and volume data you discovered and divide them to determine the concentration of your solution.

The amount of solute that has been dissolved in a specific volume of solvent or solution is measured by the solution's concentration. A solution that contains a significant amount of dissolved solute is said to be concentrated. A solution is said to be dilute if it only contains a little amount of dissolved solute.

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rank the members of each compound in order of increasing ionic character of their bonds: SeF₄ , TeF₄, BrF₃. arrange compounds as low ionic character < high ionic character are :  BrF₃ <  SeF₄ < TeF₄.

The polarity between the atoms depends on the electronegativity difference. The more the difference in the electronegativity of atoms more the polarity of the atoms. the greater the polarity or the electronegativity between the atoms more will be the ionic character.

Thus, rank the members of each compound in order of increasing ionic character of their bonds: SeF₄ , TeF₄, BrF₃. arrange compounds as low ionic character < high ionic character are :  BrF₃ <  SeF₄ < TeF₄.

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A redox reaction can be divided into two half reactions, each of which represents one aspect of electron transfer.

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

By doing so we can differentiate two types of reactions happening here one is called as the oxidation reaction and the other is called as the reduction reaction. These reactions are individually known as the half cell reactions. When we combine these half cell reactions we get a redox reaction.

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Nitrogen has five valence electrons, among the following electron configurations (image attached) option (a) represents the ground state for nitrogen.

The atomic number of nitrogen is seven, so the electronic configuration of nitrogen is as:

    1s² 2s² 2p³

Electrons present in 2s and 2p are valence electrons, so the total number of valence electrons is 5. In the outer orbitals, 2s accommodates 2 electrons in the ground state. As we can see that only options (a) (d) and (e) have 2 electrons in 2s, so we consider these as the correct option. Option (d) is also wrong because it consists of outer electrons but the nitrogen has 5 outer electrons. Option (e) is also wrong because it has 6 outer electrons. So the only correct option is (a) having 5 outer electrons 2 in 2s and 3 in 2p.

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66 infrared photons of frequency 3.38 x 1013 hz would need to be absorbed simultaneously by a tightly bound molecule to break it apart.

What is binding energy?

Binding energy is a required amount of energy that disperses the other particles of the reaction system. It measures the energy needed to free an electron or a subatomic particle.

Binding energy is the ionization energy that depicts how much energy will be needed if an electron has to be removed from an atom for a reaction to occur.

It can be said that the energy required to free an electron from the orbit of the atom is measured in electron volt (eV). It is a little different from ionization energy as binding energy can remove any subatomic particle and not just an electron.

Energy of a photon of frequency v is given by the relation

E = hv

where h has the value 6.63 x 10-34

from this relation the energy of our photon of frequency 3.66 × 1013 Hz is E = 6.63 x 10-34 x 3.66 x 1013 2.42658 × 10-20

Binding energy is the minimum energy required to break the bond which in our case is 10 x 1.6 x 10-19 1.6 x 10-187

so the total number of photons that are required to break the bond are

1.6 x 10-18 2.42658 x 10-20

n = 65.9364

n= 66

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The molar concentration of ammonia is 2.976M.

Molarity of HCl = number of moles/ volume

Number of moles = Molarity of Hcl * volume

Hence the number of moles of ammonia =[tex]14.88 * 10^{-3}[/tex]

From question volume of ammonia =[tex]5 * 10^{-3}[/tex]

Molarity = [tex]14.88 * 10^{-3}/5 * 10^{-3}[/tex]

Molarity  [tex]=2.976[/tex]

What is meant by molar concentration?

Molar concentration is the most effective way of describing a solute concentration in a solution. Molarity is described as the total number of moles of solute dissolved per liter of solution,i.e., M = mol/L.

How do you calculate the molar concentration?

To calculate the Molar Concentration, we will find the molar concentration by dividing the moles by the liters of water used in the solution.

Thus, the molar concentration of ammonia is 2.976M

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The molecular formula of the compound is C2br2.

Ideal gas law , PV=nRT

      Here, p= 1.10 atm

                v= 10.0ml

                R=8.31m3pa/kmol

                 t=292.0k

                 n=0.08439g

Now, the atomic weight of C = 13.068/12.010= 1.08802

         The atomic weight of Br= 86.932/79.904= 1.0879

Atomic weight is the mass of one atom of an element.

The ratio of c and Br is 1.08802/1.0879= 1/1.This is close to a 1:1 ratio.

Molar mass of the compound is the mass of the sample of the compound  divided by the amount of the substance.

The molar mass of CBr is 91.9147.

So, using  all the expressions we knew that the molecular formula of compound is C2Br2.

Molecular formula is the number of atoms in one molecule of a compound.ideal gas law relates the macroscopic properties of ideal gases.it describe the behaviour and properties of the gas.

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T.aq dna polymerase is used in pcr reactions rather than a normal dna polymerase because-

(a) It is thermostable and maintains activity even when high temperatures cause the DNA in the (bacteria) Thermus acquaticus to become denaturized.

(b) Getting several copies of the desired gene (or DNA).

How does taq dna polymerase work?

Thermus aquaticus, also known as T.aquaticus, is a bacterium found in hot springs and hydrothermal vents. Taq polymerase was found to be an enzyme that could tolerate the protein-denaturing conditions like high temperature needed for PCR. Therefore, the DNA polymerase employed in PCR process comes from a specific source.

Thermus aquaticus, a thermophilic microorganism capable of surviving and reproducing in thermal hot springs with temperatures nearing 100 degrees Centigrade, such as those found in Yellowstone National Park, was discovered to contain the Thermus aquaticus enzyme in active form.

The enzyme was discovered to be perfect for PCR processes since an aliquot of enzyme did not need to be added after each cycle of denaturation since at this temperature  double stranded DNA is denatured.

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Bond order refers to how many electron pairs there are in a bond between two atoms. A single bond, a double bond, a triple bond, a quadruple bond, and so on have a bond order of one in a covalent bond between two atoms.

Bond order is determined by the ratio of bonding to antibonding electrons, so for NO+, the bond order is (8 - 2)/2 = 6/2 = 3, or a triple bond.

Bond order for NO⁺ is (8-3)/2 = 5 / 2 = 2.5, which is a partial double bond. Bond order for NO⁻ is (8-4)/2 = 4/2 = 2, which is a double bond.

The quantity of electron pairs between two atoms is the bond order itself. The bond order between the two nitrogen atoms in diatomic nitrogen, for instance, is 3.

For NO⁻ and NO+, determine the bond order.

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The Ecell decreases with an increase in molar concentration of [Zn2+].

Concentration cells work to establish equilibrium by transferring electrons from the cell with the decreased concentration to the cell with the higher concentration. The electrode capability distinction between the two half-cells may be calculated with the use of the Nernst equation.

Description. Zinc (II) ion, additionally known as ZN2+ or zinc ion, belongs to the elegance of inorganic compounds called homogeneous transition metal compounds. these are inorganic compounds containing only metallic atoms, with the most important atom being a transition metal atom. Zinc (II) ion is possibly impartial.

A concentration cell acts to dilute the extra-focused answer and pay attention to the more dilute answer, growing a voltage as the cell reaches an equilibrium. this is finished by using shifting the electrons from the mobile with the lower awareness to the cell with the better concentration.

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Answer:

[Zn2+] anode < [Zn2+] cathode

Explanation:

The anode is the electrode where electricity moves into. The cathode is the electrode where electricity is given out or flows out. Anode is going to be negative and the cathode is going to be positive.

The mass % of water in the hydrated salt is 47.34%

Mass % is the mass of the element or solute divided by the mass of the compound or solute

Here given data is

Mass =  130.863 g/mol

3 mol of water associated with it

We have to calculated mass % of water in the hydrated salt = ?

So mass of anhydrous salt  = 160.167g/mol

Mass of the hydrated salt = 160.167 + 8(18)

160.167 + 144 = 304.167g

% mass of water in hydrated salt = (144/304.167) ×100 = 47.34%

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Bi3+(aq) + 3H2O(l) --> BiO​​​​3-(aq) + 6H+(aq) + 2e is balanced half-reaction for the oxidation of bismuth ion to bismuth oxide ion in acidic aqueous solution.

What is balanced half reaction?

Half-reactions are another way for balancing redox reactions. Remember that a half-reaction is the oxidation or reduction that occurs and is treated individually. When the chemicals in the reaction are in aqueous solution, the half-reaction approach performs better than the oxidation-number method. Because the aqueous solution is usually acidic or basic, hydrogen ions or hydroxide ions are present.

In general, the half-reactions are first balanced separately by atoms. The half-reactions contain electrons. The amount of electrons lost is then balanced to equal the number of electrons acquired. Finally, the two half-reactions are combined. The oxidation of Fe2+ ions to Fe3+ ions in acidic solution by dichromate (Cr2O27) is an example. The dichromate ions are converted to Cr3.

i3+ --> BiO3-

First balance O with H2O and H with H+ ion.

Bi3+ + 3H2O --> BiO3- + 6H+

Now balance charge with e- and after this you will get balanced half equation in acidic medium is--

Bi3+(aq) + 3H2O(l) --> BiO​​​​3-(aq) + 6H+(aq) + 2e

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The electrostatic interactions between salt water molecules are stronger than those between salt water molecules because the boiling point of salt water is higher than that of fresh water.

The electrostatic force is made up of electrically charged particles that exhibit both an attractive and a repulsive behavior. It is additionally called Columb's force. Charles-Augustin de Coulomb, a French scientist, would be honored by having the Columb attraction bear his name. However, electrostatic force is one of the four fundamental forces of nature. Electrostatics is the analysis of electric charges when they are at rest.

Examples of electrostatic forces include running a piece of paper through our hair while using a comb to create an electrostatic field. When one balloon is brushed with hair, the other balloon becomes drawn to it.

In general, the intensity of the electrostatic interactions between the molecules in either type of water can be gauged from the boiling temperatures of various substances. We will quickly discover that salt water has a boiling point that is significantly higher than those of fresh water, showing that the electrostatic interactions between salt water molecules are stronger than those between fresh water molecules.

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The electron and molecular geometry of a molecule match the central atom and have no lone pairs of electrons. Option C.

Electron geometry and molecular geometry are the same when each electron group connects two atoms. The presence of an unbonded lone pair of electrons causes the geometry of the molecule to differ from the geometry of the electrons. The electron group geometry is determined by the number of electron groups.

On the other hand, the molecular structure depends not only on the number of electron groups but also on the number of free electron pairs. If the electron groups are all bond pairs, they are named exactly like the electron group geometry. A central atom with no lone pairs bonded to four other atoms has a tetrahedral shape.

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Green is represented with an absorption wavelength of 500 nm. As a result, it will absorb green and display red, which is complementary to green.

What is the electromagnetic spectrum?  

The electromagnetic spectrum is made up of the many wavelengths and associated frequencies of light. The speed of light constantly establishes a relationship between shorter frequencies and longer wavelengths. Because they have the shortest wavelengths, gamma rays can ionize material. The longest lengths are found in radio waves, whose wavelengths can exceed 100,000 km.

Between the ultraviolet and infrared spectra, the visible spectrum has wavelengths.

This is a reference to spectroscopic techniques that calculate how much radiation interacts with a substance, depending on its frequency or wavelength, and how much of that radiation is absorbed. Absorption spectroscopy utilizes the full electromagnetic spectrum.

So, the correct option is green.
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10) In the given reaction,

4NH₃+5O₂→4NO+6H₂O

The mol to mol ratio of O₂ to NO is 5 mole O₂/4 mole NO.

A mol to mol ratio is defined as the ratio between the amounts in moles of any two compounds, which is involved in a balanced chemical reaction. For example in the given reaction

NaOH+HCl→NaCl+H₂O

The mol to mol ratio between NaOH and HCl is 1:1, as we consider the coefficients present in the reaction for mol to mol ratio.

To calculate the mol to mol ratio, we need to balance the given chemical reaction. The reaction 4NH3 +50₂→4NO+6H₂O is balanced, and coefficient for O₂ is 5. The coefficient for NO is 4. Hence mol to mol ratio of O₂ to NO is 5:4.

Therefore, the mol to mol ratio of O₂ to NO is 5 mole O₂/4 mole NO.

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If a reaction occurs between K₂2CO₃ and Cu(NO₃)₂ and the equation is properly balanced with the smallest whole-number coefficients, the sum of the coefficients of the reactants and products will be 5.

The reaction between K₂2CO₃ and Cu(NO₃)₂ is represented by the following chemical equation:

K₂2CO₃ and Cu(NO₃)₂ = CuCO₃ + KNO₃

However, the above equation is yet to be balanced. A balanced equation will have the same number of atoms of different elements in the reactants and in the products. The balanced version of the equation is written as:

Cu(NO₃)₂ + K₂CO₃ = --- CuCO₃ + 2KNO₃

The reactants/products with their respective coefficients are as follows:[Cu(NO₃)₂ - 1K₂CO₃ - 1[CuCO₃] - 1[KNO₃ - 2

Thus, the sum of all the coefficients for reactants and products will be:

1 + 1 + 1 + 2 = 5

In other words, if a reaction occurs between K₂CO₃ and Cu(NO₃)₂ and the equation is properly balanced with the smallest whole-number coefficients, the sum of the coefficients of the reactants and products is 5.

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Energy is used to increase the kinetic energy of the molecules. So its temperature will not rise, since kinetic energy of molecules remains the same.

Because the energy involved in a phase changes is used to interrupt bonds, there is no growth in the kinetic energies of the particles, and therefore no rise in temperature. Similarly, electricity is needed to vaporize a liquid to overcome the attractive forces among debris within the liquid.

During segment trade, the energy supplied is used simplest to split the molecules ; no part of it's far used to boom the kinetic strength of the molecules. So its temperature will now not upward thrust, for the reason that kinetic energy of molecules remains the identical.

Materials can change phase often due to a temperature change. At low temperatures, maximum substances are solid; as the temperature increases, they grow to be liquid; at higher temperatures nevertheless, they end up gaseous.

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The part of the solution that is the bigger proportion of the solution is the Solvent.

A solvent is that component of a solution that completely dissolves the solute in it to form a homogenous mixture “solution”. In addition to being a liquid, a supercritical fluid, a solid, or a gas can also be a solvent.

The solution is a homogenous mixture composed of Solvent (larger in concentration) and Solute (smaller in concentration).

A homogenous mixture of two or more than two components is termed as a solution. The material with the highest concentration is referred to as the solvent, while the substance with the lowest concentration is referred to as a solute.

Hence, the part of the solution that is the bigger proportion of the solution is the Solvent.

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The volume of 5.0 grams of gasoline which has a density of 0.70 g/ml is 7.14m3

Petroleum-derived clear flammable liquid known as gasoline or petrol is the main fuel for the majority of spark-ignited internal combustion engines. It mostly comprises of organic compounds made from petroleum fractional distillation that have been improved with various additions.

Density is the measurement of how tightly a material is packed together. It is defined as the mass per unit volume.

Acc. to the given data

mass of gasoline = 5.0 g

density of gasoline=0.70g/ml

now to find the volume we use the following formula

V=m/p

V= 5.0/0.70

V=7.14m3

Hence, the volume of 5.0 grams of gasoline which has a density of 0.70 g/ml is 7.14m3

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To determine the concentration of the hydrobromic acid, the student would need to perform titration and take readings.

Titration is the gradual addition of one answer of a regarded concentration to a recognized quantity of some other solution of unknown awareness till the reaction reaches neutralization, which is regularly indicated via a color trade.

The reason of the titration is the detection of the equivalence point, the factor at which chemically equivalent amounts of the reactants had been mixed. the quantity of reactants which have been combined at the equivalence factor depends on the stoichiometry of the reaction.

Titration is a not unusual laboratory technique of quantitative chemical evaluation to determine the awareness of an diagnosed analyte. A reagent, termed the titrant or titrator, is prepared as a standard answer of recognised concentration and extent.

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False

According to Newton's Second Law of Motion, the net force on an object is equal to the product of its mass

(M) and acceleration (A)

.

That is: F(net)= M×A

If the net force on the object is zero, the acceleration of the object is also zero.

However, this does not mean that the object is in rest. It means that the object will continue to maintain its state of rest or uniform motion, according to Newton's first law of motion. If the object was moving, it will continue to move with a constant velocity.

Hence, the statement is false.

Molecular exclusion chromatography can be used to measure the molecular mass of a protein as it separates the proteins on the basis of molecular mass.

Exclusion chromatography refers to those chromatographic techniques that divide sample components based on their molecular weight. Several of these methods are now under development, and it is practical to categorize them into two groups: sieving separations and gel permeation.

The chromatographic technique known as size-exclusion chromatography (SEC), also referred to as molecular sieve chromatography, separates molecules in solution based on their size and, in some situations, molecular weight. Proteins and commercial polymers are typical examples of big molecules or macromolecular complexes to which it is typically applied.

Thus, molecular exclusion chromatography can be used as it separates the proteins on the basis of molecular mass.

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Answer: Li3N + 3 NH4NO3 → 3 LiNO3 + (NH4)3N

Explanation:

This is a type of double displacement reaction.

Here, on the reactant side, we have 3 Li, 1 N, 1 NH4, and 1 NO3.

On the product side, we have 1 Li, 1 N, 3 NH4, and 1 NO3.

To balance the two sides, we have to equal the number of atoms of Li and NO4. Thus, we get:

⇒ Li3N + 3 NH4NO3 → 3 LiNO3 + (NH4)3N

The mass of 2.1 × 10²³ molecules of H₂O₂ have 11.86 g.

given that :

mass of the molecules : 2.1 × 10²³  molecules

mass of the H₂O₂ = (number of molecules / Avogadro's number) × molar

                                                                                                                 mass

molar mass of H₂O₂ = 34.015 g/mol

Avogadro's number = 6.022 × 10²³

mass of the H₂O₂ = (number of molecules / Avogadro's number) × molar

                                                                                                                 mass

                               =  ( 2.1 × 10²³ / 6.022 × 10²³ ) × 34.015

                              = 11.86 g

so the mass of H₂O₂ is 11.86 g.

Thus, The mass of 2.1 × 10²³ molecules of H₂O₂ have 11.86 g.

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The energy of the metal d orbitals distributing a charge of −6 due to an increase in electrostatic repulsion.

What is crystal field theory?

The ability of transition metals to form complexes is a key property. A complex is made up of a core metal atom or ion surrounded by a number of ligands. Crystal field theory governs the interaction of these ligands with the core metal atom or ion.

Crystal field theory was developed in 1929 and treats the interaction between metal ion and ligand as a purely electrostatic phenomena, with the ligands seen as point charges in the region of the central atom's atomic orbitals. Crystal field theory was developed and extended to account for the partly covalent character of bonding between ligands and metal atoms, primarily through the application of molecular orbital theory.

To accurately grasp the crystal field interactions in transition metal complexes, knowledge of the geometrical or spatial distribution of d orbitals is required. In a free gaseous metal ion, the d-orbitals are fivefold degenerate. If a spherically symmetric field of negative ligand filled charge is imposed on a central metal ion, the d-orbitals remain degenerate but the energy of the free ion changes.

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The number of aluminum atoms present in 30.0 g of [tex]Al_2O_3[/tex] would be 3.54 x [tex]10^{23[/tex] atoms.

According to Avogadro, 1 mole of every substance contains about 6.022 x [tex]10^{23[/tex] atoms or molecules of the substance.

[tex]Al_2O_3[/tex]  is a compound of aluminum and oxygen. In ion form, the compound ionizes to aluminum and oxygen ions as follows:

[tex]Al_2O_3[/tex]  ---> [tex]2Al^{3+} + 3O^{2-}[/tex]

This means that every 1 mole of  [tex]Al_2O_3[/tex] contains 3 moles of Al.

Recall that: mole = mass/molar mass

Molar mass of  [tex]Al_2O_3[/tex] = 101.96 g/mol

Mole of 30.0 g  [tex]Al_2O_3[/tex] = 30/101.96

                                     = 0.2942 mole

From the mole ratio, the equivalent mole of Al would be:

0.2942 x 2 = 0.5885 mol

We said: 1 mole =  6.022 x [tex]10^{23[/tex] atoms

Thus, 0.5885 moles = 0.5885 x  6.022 x [tex]10^{23[/tex] atoms

                                  = 3.54 x [tex]10^{23[/tex] atoms

In summary, 30.0 g of  [tex]Al_2O_3[/tex] will contain 3.54 x [tex]10^{23[/tex] atoms of aluminum.

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