How many molecules are there in 8.25 moles of CaHia?

The  ion will form from each main‑group element in periodic table is :

Na : Na⁺

F : F⁻

N : N³⁻

I : I⁻

Sr : Sr²⁺

The periodic table will help in identifying the type of the ion that an element can form which is based on the electrons need to be gained or the lost and  become stable. The element with the positive charge means it losses the electrons to fulfil the octet rule and become stable.

The element with the negative charge show that the element gains the electrons to become stable. To becom stable the element needs to statisfy the octete rule that to have the 8 electrons in the outer most shell.

The question is incomplete, the complete question is :

Use the periodic table to predict which ion will form from each main-group element.

Na:

F:

N:

I:

Sr:

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Answer:

CO2

Explanation:

You have 3 C for 6 O, then the empirical will be 1 C for 2 O

=> CO2

When a ground state hydrogen atom absorbs a photon of light having a wavelength of 92.6 nm, the final state of the hydrogen atom is the excited state.

The hydrogen atom has only one electron, which is located in the ground state or the first energy level. When a photon of light of 92.6 nm wavelength is absorbed, the electron gains energy and jumps to the higher energy level, which is the second energy level (n = 2).

Thus, the final state of the hydrogen atom is the excited state or the second energy level. The energy absorbed by the electron is equal to the energy of the photon. The energy of a photon is given by the formula: Energy of a photon = hc/λwhere,h = Planck's constant = 6.626 x 10⁻³⁴ J.s

c = speed of light = 3 x 10⁸ m/s λ = wavelength of the photon

Substituting the given values, we get

Energy of a photon = (6.626 x 10⁻³⁴ J.s x 3 x 10⁸ m/s) / (92.6 x 10⁻⁹ m)

Energy of a photon = 2.14 x 10⁻¹⁸ J. The energy absorbed by the electron is equal to the energy difference between the two energy levels.

The energy of an electron in the nth energy level of the hydrogen atom is given by the formula: E_n = (-2.18 x 10⁻¹⁸ J) / n² where, E_n = energy of electron in nth energy level

Substituting n = 1 (ground state), we get: E₁ = (-2.18 x 10⁻¹⁸ J) / (1)²   E₁= -2.18 x 10⁻¹⁸ J

Substituting n = 2 (excited state), we get: E₂ = (-2.18 x 10⁻¹⁸ J) / (2)²  E₂ = -0.545 x 10⁻¹⁸ J

The energy absorbed by the electron is the difference between the energy of the electron in the excited state and the energy of the electron in the ground state.

ΔE = E₂ - E₁

ΔE = (-0.545 x 10⁻¹⁸ J) - (-2.18 x 10⁻¹⁸ J)ΔE = 1.64 x 10⁻¹⁸ J

Since the electron gains energy, the energy absorbed by the electron is positive. Therefore, the final state of the hydrogen atom is the excited state.

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alpha polonium crystallizes in a simple cubic unit cell with an edge length of 336 pm, the density becomes 7.318 g/cm³.

The smallest repeating unit with complete crystal structural symmetry is designated as a unit cell. The unit cell geometry, sometimes referred to as a parallelepiped, provides six lattice parameters, which are the lengths of the cell edges (a, b, and c) and the angles at which they are spaced apart ( α,β,γ ).

Given that,

alpha polonium crystallizes in a simple cubic unit cell with an edge length (a) of 336 pm.

As we know, the relation between radius (r) and edge length (a) for simple cubic unit cell is: 2 r = a

Thus, r = a/2

r = 336/2   [ given a = 336 pm]

r = 168 pm

Now, density (d) = (Z × M) / a³ × \(N_A\)

Here, Z = number of atom in a simple cubic unit cell = 1

M = molecular weight of polonium

\(N_A\) = Avogadro's no.

d = ( 1  × 209) / (168 ×10⁻¹²)³ × (6.023 × 10²³)

d = 7.318 × 10⁷ g/m³

d =  7.318 g/cm³

So, the density of alpha polonium is 7.318 g/cm³.

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The approximately 4 moles of gas in the container at standard temperature (ST) with a volume of 99.2 L.

To determine the number of moles of gas in a container at standard temperature (ST) with a volume of 99.2 L, we need to use the ideal gas law equation:

PV = nRT

Where:

P = pressure (atmospheres)

V = volume (liters)

n = number of moles

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

T = temperature (Kelvin)

At standard temperature (ST), the temperature is 273.15 K.

Assuming the pressure is also at standard conditions (1 atm), we can rearrange the ideal gas law equation to solve for the number of moles:

n = PV / RT

Substituting the given values:

P = 1 atm

V = 99.2 L

R = 0.0821 L·atm/mol·K

T = 273.15 K

n = (1 atm) × (99.2 L) / ((0.0821 L·atm/mol·K) × (273.15 K))

Simplifying the calculation:

n ≈ 4 moles

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Answer: 44g

Explanation: The formular for finding Moles is ;

Moles =  Mass / Molar Mass or Formular Mass.

Base on this question; Moles = 10, Mass = 440g, and Formular Mass = ?

Making 'Formular Mass', subject of the formular; we thus have;

Formular mass = Mass / Moles = 440/ 10 = 44g

The δ- end of the water molecule is attracted to the Na+ ion while the δ+ end of the water molecule is attracted to the Cl- ion.Ion-dipole forces are a type of intermolecular force that occurs between a charged ion and a polar molecule.

Therefore, the answer to this question is ion-dipole forces.

When extracting water out of an organic layer, it is often a good idea to extract with aqueous sodium chloride (brine) instead of plain water. One of the reasons is that water that is saturated with salt is better at extracting water out of an organic layer than pure water alone.

The intermolecular forces present in saltwater that make it a good idea for extracting water from an organic solvent are ion-dipole forces. Sodium chloride is made up of Na+ and Cl- ions which are capable of forming ion-dipole forces with water molecules.

The δ- end of the water molecule is attracted to the Na+ ion while the δ+ end of the water molecule is attracted to the Cl- ion.Ion-dipole forces are a type of intermolecular force that occurs between a charged ion and a polar molecule.

Therefore, the answer to this question is ion-dipole forces.

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Answer:

About 5.8 trillion miles is equal to 1 light year

so (5,878,600,000,000 miles)*(1.21 light-years) = 7,113,106,000,000 miles

Answer: (B) CFCs were replaced with other products

Answer:

B

Explanation:

I don't have 1 sorry

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Answer:

Element are substances made up of the same kind of atoms

Answer:

The mass number (A), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus. The mass number is different for each different isotope of a chemical element.

The molarity of the 500 mL KOH solution needed to neutralize the 40 mL of 2.50 M HCl is 0.2 M

HCl + KOH —> KCl + H₂O

From the balanced equation above,

The mole ratio of the acid, HCl (nA) = 1

The mole ratio of the base, KOH (nB) = 1

MaVa / MbVb = nA / nB

(2.5 × 40) / (0.15 × Vb) = 1

100 / (Mb × 500) = 1

Cross multiply

Mb × 500 = 100

Divide both side by 500

Mb = 100 / 500

Mb = 0.2 M

Thus, the molarity of the KOH solution needed is 0.2 M

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the correct answer is dissapate...but it is

not here so i think relativly the answer is destroy

There are 10.196 grams of ethane present in the sample. there are 10.201 grams of ethane in the sample.

To calculate the grams of ethane present in a sample containing 0.3393 moles, you can use the formula:

grams = moles x molar mass

Plugging in the given values, we get:

grams = 0.3393 moles x 30.067 g/mol
grams = 10.196 g

Therefore, there are 10.196 grams of ethane present in the sample.

To calculate the grams of ethane present in a sample containing 0.3393 moles, you need to multiply the moles by the molar mass of ethane (30.067 g/mol):

Grams of ethane = moles × molar mass
Grams of ethane = 0.3393 moles × 30.067 g/mol

Grams of ethane = 10.201 g

So, there are 10.201 grams of ethane in the sample.

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Answer:

42%

Explanation:

When you add 3 pieces of zinc to blue copper sulfate and hydrochloric acid, a single displacement reaction occurs. The zinc is more reactive than copper, so it displaces copper from the copper sulfate. The reaction can be written as:

Zn(s) + CuSO4(aq) → Cu(s) + ZnSO4(aq)

In the presence of hydrochloric acid, the reaction proceeds as follows:

Zn(s) + CuSO4(aq) + 2HCl(aq) → Cu(s) + ZnCl2(aq) + H2SO4(aq)

In this reaction, zinc (Zn) reacts with copper sulfate (CuSO4) and hydrochloric acid (HCl) to form copper (Cu), zinc chloride (ZnCl2), and sulfuric acid (H2SO4). The copper is seen as a reddish-brown solid precipitate, while the sulfuric acid remains dissolved in the solution.

Answer:

Three half-lives

Explanation:

12.5% is one-eighth. One eighth is the cube of one half, so it would take three half-lives to reduce a reactant's concentration to 12.5%

Three half-lives are required for the concentration of reactant to decrease to 12. 5% of its original value.

Half -life of a substance is defined as the time which is required for half of the quantity of a radioactive substance to get decayed.It is a term which is used in nuclear chemistry for describing how quickly unstable atoms undergo radioactive decay into other nuclear species by emitting particles or the time which is required for number of disintegrations per second of radioactive material to decrease by one half of its initial value.

In the given example 12.5 % is 1/8  and three times 1/2 that is 1/2×1/2×1/2=1/8 , hence  three half lives are  required for the concentration of reactant to decrease to 12. 5% of its original value.

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Answer:

8,95

Explanation:

Density is equal to mass/volume

\(D=\frac{m}{v} \\D= \frac{1668g}{186.2} \\D = \frac{8,95g}{cm^3} \\\)

approximately

Curiosity:

Did you knew that is because of his low density that ships can fluctuate?

Despite their big mass, their volume are far greatter, so the Buoyancy Force acts heavily on them.

The specific heat capacity of a substance is the amount of heat needed to elevate it by 1 degree kelvin per gram. The easier it is for something to heat up, then, the smaller the heat capacity. We would suppose that a cook in a hurry would want a pan that heats up more quickly and would choose one with a lesser heat capacity.

0.385 for copper and 0.900 for aluminum.

Despite using non-SI units, we can still compare using it. It is obvious to him that copper has a lower specific heat, so he will pick that.

In case you're curious, you can also approach this issue from the perspective of heat conduction. To do this, look up the thermal conductivities of each material, and then apply Fourier's rule of heat conduction to determine that Copper would be best.

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No of counts:-

\(\\ \sf\longmapsto 5/1.5\)

\(\\ \sf\longmapsto 3.3counts\)

The concentration of the base can be calculated using the formula: C(base) = (C(acid) × V(acid)) / V(base)

To determine the concentration of a base (NaOH) in a titration, you would need additional information such as the volume of the base used, the volume of the acid being titrated, and the molarity of the acid solution.

The concentration of the base can be calculated using the formula:

C(base) = (C(acid) * V(acid)) / V(base)

C(base) is the concentration of the base (NaOH),

C(acid) is the concentration of the acid solution being titrated,

V(acid) is the volume of the acid solution used in the titration, and

V(base) is the volume of the base (NaOH) required to reach the equivalence point.

By plugging in the appropriate values into the formula, you can calculate the concentration of the base (NaOH) in the titration.

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Answer:

C2H3O2^-(aq) + H^+ —> HC2H3O2

Explanation:

The following equation was given in the question:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

Now, to obtain the net ionic equation, we simply cancel out the ions common to both side of the equation.

A careful observation of the equation above, shows that sodium ion, Na^+ and chloride ion, Cl^- are common to both side of the equation.

Therefore, to obtain the net ionic equation, we simply cancel out Na^+ and Cl^- from both side of the equation. This is illustrated below:

Na^+ + C2H3O2^-(aq) + H^+ Cl^- —> Na^+ + Cl^- + HC2H3O2

C2H3O2^-(aq) + H^+ —> HC2H3O2

Therefore, the net ionic equation is

C2H3O2^-(aq) + H^+ —> HC2H3O2

Answer:

To determine the amount of neutrons an element has you would subtract the number of protons/atomic number from the atomic mass.

Explanation:

Answer: 0.065

Explanation:

After 1,325 years, approximately 22.5 g of the substance remains.

The half-life of a substance is the time it takes for half of the initial amount to decay. In this case, the half-life is 265 years.

To find the mass remaining after 1,325 years, we can use the concept of half-life decay.

Since the half-life is 265 years, we can calculate the number of half-lives that have passed in 1,325 years: 1,325 years / 265 years = 5 half-lives.

Each half-life reduces the mass by half, so after 5 half-lives, the mass remaining will be (1/2)^5 = 1/32 of the initial mass.

Mass remaining = (1/32) × 180 g = 5.625 g ≈ 22.5 g

Therefore, after 1,325 years, approximately 22.5 g of the substance remains.

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The first thing we need to do is calculate the molar mass of PbS. They give us the atomic weights of lead (P) and sulfur (S), the molecular weight will be equal to the sum of the atomic weights multiplied by the atoms of each element, as follows:

Now, to calculate the number of moles we use its molecular mass and apply the following equation:

In 458g of PbS there are 1.9 mol PbS

Answer:

. a pure substance consists only of one element or one compound.

. a mixture consists of two or more different substances, not chemically        joined together