calculating formal charge

Answer:

Biological evidence, since it was a hair, which forms part of the human

Answer: 2607.31 pa

Explanation:

n = 10.1/2 = 5.05 mol

Now, according to ideal gas equation,

PV = nRT

⇒ P × 5 = 5.05 × 8.314 × (37.5 +273)

⇒P = 2607.31 Pa

1st) It is necessary to balance the chemical equation:

2nd)

The maximum temperature the cold water in the calorimeter will rise to is 48.3 °C

The maximum temperature the cold water can attain can be obtained by calculating the equilibrium temperature. This can be obtained as follow:

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

Heat loss = Heat gain

MᵥᵥC(Tᵥᵥ – Tₑ) = MC(Tₑ – T)

Cancel out C

Mᵥᵥ(Tᵥᵥ – Tₑ) = M(Tₑ – T)

128.9 × (94.2 – Tₑ) = 211.7 × (Tₑ – 20.4)

Clear bracket

12142.38 – 128.9Tₑ = 211.7Tₑ – 4318.68

Collect like terms

12142.38 + 4318.68 = 211.7Tₑ + 128.9Tₑ

16461.06 = 340.6Tₑ

Divide both side by 340.6

Tₑ = 16461.06 / 340.6

Tₑ = 48.3 °C

Thus, we can conclude that the maximum temperature is 48.3 °C

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The compound AlN, BeS, and LiF represents valid ionic compounds.

Ionic bonding:-

                          Al         N

                           3          3

Simplest ratio : -  1            1

                          Be         S

                           2          2

Simplest ratio : -  1            1

                         Li           F

                          1            1

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The final pressure when the sample of gas is administered to the new volume and temperature is 0.64 atm.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

To determine the final pressure of the gas, plug the given values into the formula above and solve for P₂.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

P₂ = P₁V₁T₂ / V₂T₁

P₂ = ( 1.20 atm × 6.02L × 293.35K ) / ( 10.0L × 332.65K )

P₂ = ( 2119.1604 KLatm ) / ( 3326.5 KL )

P₂ = 0.64 atm

Therefore, the final pressure of the gas is 0.64 atm.

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Initial Pressure = P₁ = 0.930 atm

Final Pressure = P₂ = ?

Initial Volume = V₁= 96.2 mL

Final Volume = V₂ = 44.7 mL

Temperature = constant

If we consider that ammonia as an Ideal Gas, and since the temperature is constant we can apply Boyle's Law. It says that at constant temperature:

P₁ * V₁ = P₂ * V₂

If we divide at both sides by V₂:

P₁* V₁ / V₂ = P₂ * V₂ / V₂

On the right side we can cancel V₂ and we get:

P₁* V₁ / V₂ = P₂

P₂ = P₁* V₁ / V₂

Replacing by the values that we were given:

P2 = 0.930 atm * 96.2 mL / (44.7 mL)

P2 = 2.00 atm

So the final pressure is 2.00 atm

Explanation:

Iron (III) oxide will react with hydrogen gas to produce iron and water. They will react according to the following equation.

Fe₂O₃ + 3 H₂ -----> 2 Fe + 3 H₂O

We have to find the grams of Fe that can be made from 24.5 g of Fe₂O₃. So, first we have to convert those grams into moles using the molar mass of iron (III) oxide.

molar mass of Fe₂O₃ = 159.69 g/mol

mass of Fe₂O₃ = 24.5 g

moles of Fe₂O₃ = 24.5 g * 1 mol/(159.69 g)

moles of Fe₂O₃ = 0.153 mol

Fe₂O₃ + 3 H₂ -----> 2 Fe + 3 H₂O

According to the coefficients of the equation, we know that 1 mol of Fe₂O₃ will react with 3 moles of H₂ to give 2 moles of Fe and 3 moles of H₂O. So the molar ratio between Fe₂O₃ and Fe is 1 to 2. We can use that relationship to find the number of moles of Fe that can be made from 0.153 moles of Fe₂O₃.

1 mol of Fe₂O₃ : 2 moles of Fe molar ratio

moles of Fe = 0.153 moles of Fe₂O₃ * 2 moles of Fe/(1 mol of Fe₂O₃)

moles of Fe = 0.306 moles

So we found that we can produce 0.306 moles of Fe from 0.153 moles of Fe₂O₃ or 24.5 g of it. Finally we can convert the 0.306 moles of Fe into grams using the molar mass of Fe.

molar mass of Fe = 55.85 g/mol

mass of Fe = 0.306 moles * 55.85 g/mol

mass of Fe = 17.1 g

Answer: 17.1 g of iron can be made from 24.5 g of iron (III) oxide.

If the wavelength of green light from a traffic signal is approximately 5.2 ×10⁷ m , then the frequency of the light would be 5.769 × 10¹⁶ Hz .

It can be understood in terms of the distance between any two similar successive points across any wave for example wavelength can be calculated by measuring the distance between any two successive crests.

C = λν

The frequency of the green light = 3 × 10⁸ / 5.2 ×10⁷

                                                       = 5.769 × 10¹⁶ Hz

Thus , If the wavelength of green light from a traffic signal is approximately 5.2 ×10⁷ m , then the frequency of the light would be 5.769 × 10¹⁶ Hz .

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Answer:

what is this free

branliest?

Answer:

Explanation:

The chemical reaction talks about the synthesis of calcium carbonate

It is from the reaction between sodium carbonate and calcium chloride

Let us write the equation of reaction as follows:

Firstly, we want to get the expected mass of calcium carbonate

This speaks about getting the theoretical yield based on the equation of reaction

From the data collected, 90 ml of 0.20 M (mol/L) of sodium carbonate gave calcium carbonate

We need to get the actual number of moles of sodium carbonate that reacted

We can get this by multiplying the volume by the molarity (kindly note that we have to convert the volume to Liters by dividing by 1000)

Thus, we have it as:

Hence, we see that 0.009 moles of sodium carbonate reacted theoretically

Since 1 mole of sodium carbonate gave 1 mole calcium carbonate, it is expected that 0.009 mole of sodium carbonate will give 0.009mole of calcium carbonate

What we have to do now is to get the theoretical grams of calcium carbonate produced

That would be the product of the number of moles of calcium carbonate and its molar mass

The molar mass of calcium carbonate is 100 g/mol

The theoretical yield (expected mass) is thus:

Finally, we proceed to get the percentage yield which is calculated using the formula below:

The actual yield is the observed mass which is given as 0.88 g

The percent yield is thus:

In order to answer this question we will use the molar mass of Chromium, which is 52 g/mol, that means that in every 1 mol of Cr, we will have 52 grams of it:

52 g = 1 mol

260 g = x moles

52x = 260

x = 5 moles of Chromium

The sample of hair with exposed follicular tissue is the BEST sample she can send to the lab for DNA testing (Option C).

A DNA sample is any tissue that can be used to extract DNA and therefore it is multipurpose because it can be used to identify an organism, identify polymorphisms, find gene variants associated with a phenotype of interest., etc.

Therefore, with this data, we can see that the sample of a follicular tissue contains DNA which can be used for different purposes such as the identification of an individual.

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Assuming the third quantum number is the question is the magnetic quantum number, it is limited by the angular momentum quantum number. This is inditaced in the quastion: since the orbital is 4p, the "p" indicates that the angular momentum quantum number is 1.

The magnetic quantum number can only be -1, 0 or +1.

The only alternative with one os these is alternative A.

The hydrogen bonded to the most electronegative element will have the greatest partial positive charge. This is because electronegativity corresponds to the ability of the nucleus of an atom to attract the electrons involved in a chemical bond.

So the more electronegative, the more partial negative charge the atom will have.

Linus Pauling created a scale of the most electronegative elements, which can be of help in determining the intensity of polarization of different bonds:

F > O > N > C > Br > I > S > C > P > H

In this case, F is the most electronegative element.

So hydrogen will have the greatest partial positive charge bonded to F.

Answer: HF

Cl is the limiting reactant and the mass of tin chloride that can be formed is 31.9g.

- First, we need to balance the equation:

- Second, we need to know the molar weight of the compounds:

Sn: 118.7 g/mol

Cl: 35.5 g/mol

SnCl4: 260.7 g/mol

- Third, we need to know how much Sn can react with Cl according to the balanced equation:

If 118.7g of Sn needs 142g of Cl to react according to the balanced equation, we found that the 15.7g of Sn will need 18.8g of Cl to complete the reaction.

As we have 17.4g of Cl available, we can see that we are going to need more Cl and therefore Cl is the limiting reactant.

- Now, to find the mass of tin chloride that can be formed, we use the limiting reactant amount for the calculation:

According to the balanced equation we need 142g of Cl to produce 260.7g of tin chloride, so with 17.4g of chlorine we will obtain 260.7g of SnCl4.

So, the mass of tin chloride that can be formed is 31.9g.

To solve this question we have to use the ideal gas law:

Where P is the pressure, V is the volume, n the number of moles, R the constant of ideal gases and T the temperature.

Solve the equation for T and replace for the given values. Remember that R has a value of 0.082atmL/molK:

According to this, the temperature of the gas is 11977.54K.

By definition, the percent composition of an atom in a compound is its mass percentage in the formula.

That is, if we have 1 mol of NaHCO₃, we have also 1 mol of H (because there is only on H for each molecule).

So, we calculate the mass of this 1 mol of NaHCO₃ and the mass of 1 mol of H and calculate the percentage.

In equations, we want the following:

Since these are ratios, we doesn't matter if we talk about 1, 2 or any number of moles, but 1 mol is easier because the molecular and atomi masses are for 1 mol.

The molecular mass of NaHCO₃ is:

Which means that we have approximately 84.006 grams of NaHCO₃ in 1 mol of it.

The atomic mass of H is:

Which means that we have approximately 1.008 grams of H in 1 mol of it.

Now, we can take the percentage of mass of H:

So, the percentage composition of H in NaHCO₃ is approximately 1.20%.

Answer

Procedure

Considering the following balanced equation.

2CH₃OH + 3O₂ ---> 2CO₂ + 4H₂O

To determine the grams of CO₂ that will be produced, you will first need to get the grams of water produced, then convert the grams of water into moles of water and use the molar proportios to get the moles of CO₂. Lastly, convert the moles of CO₂ into grams.

Additional data:

Dnsity of water = 1 g H₂O=/ of H₂O

CO₂ molar mass = 44.01 g/mol

H₂O molar mass = 18.02 g/mol

Calculations

Convert to mass

Convert to moles

Convert to moles of CO₂ using the relationship

Convert to grams of CO₂

Answer:

[tex]\blue{\boxed{\red{\sf CCl_4 \: will \: dissolve \: in \: gasoline}}}[/tex]

Explanation:

The simple concept that would be applied is

'Like Dissolves Like.'

According to this, the polar solvent will dissolve the polar solutes and the non-polar solvent will dissolve the non-polar solutes.

classification of given compounds as polar or non-polar,

[tex]\begin{gathered}\boxed{\begin{array}{c|c} \bf Polar & \bf Non-polar \\ \\ \frac{\qquad \qquad}{} & \frac{\qquad \qquad}{} \\ \sf NaCl & \sf CCl_4 \\ \\ \sf NaOH & \sf - \\ \\ \sf KCl & \sf - \end{array}} \\ \end{gathered}[/tex]

Also, the given data says water is a polar solvent while gasoline is a non-polar solvent. From all the information we have, we can conclude that CCl4 is the only compound that will dissolve in gasoline.

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Light below the necessary critical frequency doesn't eject electrons from metal because no electrons will be emitted when the light shines on the metal.

This is a term in physics which is used to describe the number of occurrences of a repeating event per unit of time.

The amount of energy which is present in each photon in the beam is determined by and proportional to the frequency of the beam. This therefore means that if there is light which is below the threshold frequency, there will be no electrons emitted when light shines on the metal thereby making it the correct choice.

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Option B.   All cobalt atoms are identical and are consistent with dalton's atomic theory as it was originally stated.

The primary part of dalton's atomic theory states that everyone relies on is manufactured from atoms, which can be indivisible. the second part of the theory says all atoms of a given element are the same in mass and house. The 0.33 part says compounds are combos of two or more exceptional kinds of atoms.

Dalton's atomic theory, atoms of one element are all the equal or same. for this reason, the assertion that every cobalt atoms are identical is consistent with Dalton's concept of the shape of atoms.

Dalton's atomic concept additionally proposed that each atom of an element is identical in nature and exceptional elements vary in length, mass, and chemical properties. So, the accurate answer is choice 1 which says that the first and 2d statements are correct.

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The concertation of the HI that would be present in the new equilibrium position is 0.15 M.

We have to first obtain the equilibrium constant that we have under the initial conditions and then we have; H2 + I2 ------> 2HI

K = [HI]^2/[H2] [I2]

K = (0.490)^2/(0.080) (0.060)

K = 0.2401/(0.080) (0.060)

K = 50

Again;

                               H2      +      I2                     ------> 2HI

Initial                     0.080           0.060                        0.060

concentration         +x                   +x                            -2x

Equilibrium     0.080 + x      0.060 + x                 0.490 - 2x

50 = (0.490 - 2x)^2/( 0.080 + x) (0.060 + x)

Working through the quadratic we have;

46x^2 + 10.2 x - 0.38 = 0

x = 0.32 M

In each case we now have;

 H2 =  0.080 +  0.32  = 0.4 M

[I2] = 0.060  +  0.32  = 0.38 M

[HI] = 0.790 - 2( 0.32 ) = 0.15 M

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Answer

The pressure of the sample is 1.47 atm

Explanation

Given:

Moles, n = 1.31 mol

Volume, V = 24.6 L

Temperature, T = 336 K

The ideal gas constant, R = 0.0821 L*atm/mol*K

What to find:

Pressure, P of the sample.

Step-by-step solution:

Pressure, P of the sample can be calculated using the ideal gas equation.

Put the values of the parameters into the formula, we have;

The pressure of the sample is 1.47 atm

Answer: 2Na(s)+O₂(g) → Na₂O₂ (s)

Explanation: Since there is only one sodium on the left side of the equation and 2 on the right all you have to do is put a 2 in front of the sodium on the left

The balanced reaction is:

According to this, 3 moles of H2 produce 2 moles of NH3. Use this ratio to find the number of moles of NH3 produced:

It means that 18 moles of H2 are needed to produce 12 moles of NH3

In this question, we have a reaction between silver nitrate and potassium chloride, which will have the following chemical formula and also the following product:

AgNO3 (aq) + KCl (aq) --> AgCl (s) + KNO3 (aq)

Now we need to identify the ions that are components of the precipitate that was formed in this reaction

A precipitate is a product of a reaction that is not soluble in water in the conditions given in the reaction, therefore the precipitate will be a solid product of the reaction. The solid of the reaction is AgCl, therefore this is the precipitate

Now the ions that compose AgCl are Ag+ and Cl-, the answer will be the 3rd option

Explanation:

C₂H₄ + 3 O₂ ——> 2 CO₂ + H₂O

According to the coefficients of the equation 1 mol of C₂H₄ will react with 3 moles of O₂. Then, the molar ratio between C₂H₄ and O₂ is 1 to 3. We can use that relationship to find the number of moles of oxygen that are needed to react with 5.75 moles of C₂H₄.

1 mol of C₂H₄ = 3 moles of O₂

moles of O₂ = 5.75 moles of C₂H₄ * 3 moles of O₂/(1 mol of C₂H₄)

moles of O₂ = 17.25 moles

One mol of a gas at STP always occupies 22.4 L. We can use that relationship to find the volume of oxygen.

1 mol of O₂ = 22.4 L

volume = 17.25 moles of O₂ * 22.4 L/(1 mol of O₂)

volume = 386.4 L

Answer: 386.4 L at STP is needed to react.

The number of photons having a wavelength of 16.0 um required to produce 2.3KJ of energy is 1.85 x 10¹⁹

Photons are defined as a basic particle that is both the force carrier for the electromagnetic force and a quantum of the electromagnetic field, which includes electromagnetic radiation like light and radio waves.

It can also be defined as a discrete bundle of electromagnetic energy is what is known as a light particle.

Energy = 2.3 KJ

Wavelength = 16.0 x 10⁶ m

Energy = hc / ∧

            = 6.63 x 10²⁴ x 3 x 10³ / 16.0 x 10⁶

            = 1.24 x 10¹⁹ J

Number of photons used = 2.3 KJ / 1.24 x10¹⁹

                                          = 1.85 x 10¹⁹

Thus, the number of photons having a wavelength of 16.0 um required to produce 2.3KJ of energy is 1.85 x 10¹⁹

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