Pleas help!!! I’ll make brainlist

Answer:

I think is answer

CH3cl3

Answer:

= 14.63 × [tex]10^{45}[/tex] particles.

Explanation:

According to Avogadro's priciple:

1 mole of any substance is 6.02 × [tex]10^{23}[/tex] particles

∴ 2.43 x [tex]10^{24}[/tex] moles × 6.02 × [tex]10^{23}[/tex]

= 14.63 × [tex]10^{45}[/tex] particles.

I hope this was clear and easy to understand.

Explanation:

Percentage Yield

= (3.37g/3.81g) * 100% = 88.45%.

Therefore 88.45% SO2 is the percentage yield.

Answer:

0.21 atm

Explanation:

Step 1: Given data

Step 2: Calculate the partial pressure of oxygen

The air is a gaseous mixture formed mainly by nitrogen, oxygen and argon. The total pressure is equal to the sum of the partial pressures of the gases.

P = pN₂ + pAr + pO₂

pO₂ = P - pN₂ - pAr

pO₂ = 1 atm - 0.78 atm - 0.01 atm

pO₂ = 0.21 atm

The change in energy of the system : -63 J

Given

279 J work

216 J heat

Required

The change in energy

Solution

Laws of thermodynamics 1

ΔU=Q+W

Rules :

a gas work on the surrounding : W =-279 J

a gas absorb heat from surrounding : Q = +216 J

Internal energy :

= -279+216

= -63 J

Answer:

true

Explanation:

calculating the average atomic

Answer:

0.21 atm

Explanation:

From the question given above, the following data were obtained:

Partial pressure of N₂ (P₁) = 0.78 atm

Partial pressure of Ar (P₂) = 0.01 atm

Partial pressure of O₂ (P₃) =?

Since the system is at standard temperature and pressure (STP), the total pressure of the system is 1 atm.

Finally, we shall determine the partial pressure of O₂. This can be obtained as follow:

Partial pressure of N₂ (P₁) = 0.78 atm

Partial pressure of Ar (P₂) = 0.01 atm

Total pressure (Pₜ) = 1 atm

Partial pressure of O₂ (P₃) =?

Pₜ = P₁ + P₂ + P₃

1 = 0.78 + 0.01 + P₃

1 = 0.79 + P₃

Collect like terms

1 – 0.79 = P₃

P₃ = 0.21 atm

Therefore, the partial pressure of O₂ is 0.21 atm.

Answer:

yes

Explanation:

its not that hard to get

Answer:

Option B. 3 m/s east

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 2 m/s east

Final velocity (v) = 5 m/s east

Time (t) = 6 s

Change in velocity =?

We can obtain the change in Lee's velocity as illustrated below:

Initial velocity (u) = 2 m/s east

Final velocity (v) = 5 m/s east

Change in velocity =?

Change in velocity = Final velocity (v) – Initial velocity (u)

Change in velocity = v – u

Change in velocity = 5 – 2

Change in velocity = 3 m/s east

Thus, the change in Lee's velocity is 3 m/s east

Answer:

Option (B.) 3 m/s east

Explanation:

Have a good day hope it helps

Water is a Polar Covalent Molecule

The unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule means that a water molecule has two poles - a positive charge on the hydrogen pole (side) and a negative charge on the oxygen pole (side).

thank me and mark me as brainliest

Answer:

0.004 m/s

Explanation:

Given data:

Distance traveled = 23 m

Time taken = 5289 s

Speed of bike = ?

Solution:

Formula:

speed = distance / time

b y putting values,

speed = 23 m/ 5289 s

speed = 0.004 m/s

Answer:

By measuring through scale

Explanation:

CAN YOU TELL THE NAME OF COUNTRY BECAUSE I AM FROM NEPAL

Answer:

Aluminum (Al) is the only metal in period 3 on the periodic table.

Answer:

Speed

Explanation:

That is what I believe the word to the definition, How far something moves in a specific amount of time, but you'd have to providea picture of the list of words for me to be sure...

Answer:

A.

Explanation:

1: selective breeding

2:traits

3: crop species

4: domestic

5: diverse

6: artificial

7: uniform

in your opinion if the answer is correct please like n mark MI s brain list

Answer:

uh

Explanation:

5+x/3=9

=x/3=9-5

=x=12

Answer:

Mass = 0.43 g

Explanation:

Given data:

Mass in gram = ?

Number of molecules of NiO = 3.45×10²¹

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ molecules

3.45×10²¹ molecules × 1 mol / 6.022 × 10²³ molecules

0.57×10⁻² mol

0.0057 mol

Mass in gram:

Mass = number of moles × molar mass

Mass = 0.0057 mol × 74.69 g/mol

Mass = 0.43 g

Answer:

19.4%

Explanation:

Calcium Chlorate is Ca(ClO3)2

Now calculate the molar mass of Ca(ClO3)2

Ca = 40.1

Cl = 35.5

O = 16.0

But they are two chlorine atoms and six oxygen atoms. So you do this:

40.1 + 35.5(2) + 16.0(6) = 207.1 grams

Now find the molar mass of just calcium.

There is only one calcium atom.

So you do this.

40.1(1) = 40.1

Now divide the molar mass of calcium by the molar mass of calcium chlorate.

40.1 / 207.1 = 0.1936

0.1936 rounds to 0.194

Now multiply 0.194 * 100 and you will get 19.4

So the final answer is 19.4%.

Hope it helped!

Answer:

B. Water will freeze

because the latent heat of vapourization decreases.

Answer:

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. In this reaction, cupric ions (from copper sulphate) combine with sulphide ions (from hydrogen sulfide) to form cupric sulphide.

Answer:

When hydrogen sulphide gas is passed through a blue solution of copper sulphate, a black precipitate of copper sulphide is obtained and the sulphuric acid so formed remains in the solution. In this reaction, cupric ions (from copper sulphate) combine with sulphide ions (from hydrogen sulfide) to form cupric sulphide.

Explanation:

Explanation:

Fe. O

72.40/ 56 27.60/16

____________________

1.29/1.29 1.725/1.29

_____________________

1. :. 1

Empirical formula is the whole number ratios of elements in a compound. It can be found from the number of moles. The empirical formula of iron and oxygen of 72.4 % and 27.6 % respectively is Fe₂O₃.

Empirical formula of a compound is the chemical formula derived from the number of moles each element present in it.  Whereas, molecular formula is derived from the actual masses of the elements present in the compound.

Empirical formula can be determined from the number of moles of the elements. It is given that the mass percentages of iron and oxygen are 72.40% and 27.60% respectively. This can be taken as 72.40 g and 27.60 g in a 100 g of compound.

Thus there is 72.40 g of iron. The atomic mass of Fe = 55.85 g/mol

Thus number of moles of Fe = 72.40 / 55.85

                                               = 1.295

The weight of oxygen in 100 g of compound is 27.60 g. Atomic mass of oxygen is 16 g/mol.

Thus number of moles of oxygen = 27.60 /16 = 1.725

Taking the ratios of these number of moles = 1.295 :1.725 = 2 :3

Hence, the ratios of iron to oxygen is 2:3 which means the empirical formula of the compound is Fe₂O₃.

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Answer:

A solid is a matter that has particles that are closely packed which as a result makes it vibrate but not flow.

Answer:

The answer is D.

Explanation:

Given that velocity also applies speed formula, S = D ÷ T where D represents distance and T is time :

S = D ÷ T

S = 100m ÷ 25s

S = 4m/s

V = 4m/s east

The difference between speed and velocity is that speed has only magnitude but velocity has magnitude and direction.

Answer:

no

Explanation:

Answer:

Chemical reactions involve the loss, gain, or sharing of electrons, but do not involve changes to the nucleus of an atom. Nuclear reactions involve changes to the nucleus and produce a new particle. Chemical reactions involve low energy changes. Chemical reactions never involve a change in the mass of atoms.

List three characteristics of chemical reactions, I have five:

occur when bonds are broken and formed

atoms remain unchanged though they may be rearranged

involve only valence electrons

reaction rate is influenced by, temp, pressure, concentration, and catalyst

Three characteristics of nuclear reactions, I have five:

occur when nuclei emit particles

atoms are often converted into atoms of another element

may involve protons, neutrons, and electrons

reaction rate is not normally affected by temp, pressure or catalyst

Answer:

Energy of atom is in lowest. The energy of electrons are given energy. The electrons absorb energy. Its converted to higher level of energy.

When excited electrons return to their ground state, atomic emission spectra are produced. When electrons return to a lower energy level, they emit light energy.

The emission spectrum of a chemical element or chemical compound is the spectrum of electromagnetic radiation frequencies emitted as a result of an electron transitioning from a high energy state to a lower energy state.

The emitted photon's photon energy equals the energy difference between the two states.

Atomic emission spectra provided further evidence of light's quantized nature, leading to the development of a new model of the atom based on quantum theory.

When excited electrons return to their ground state, atomic emission spectra are produced. The light emitted corresponds to the energies of the specific electrons.

Thus, this way atomic emission Spectra give us information about the energy levels of electrons in atoms .

For more details regarding atomic emission spectra, visit:

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