how do i calculate the molar mass of 5 and 65. K2Cr2O76. C12H22O11

Electronegativity is defined as the ability of an element to accept electrons to its shell during a chemical reaction for the formation of a stable bond structure.

A neutral atom is the atom that contains an equal amount of electrons and protons which means that is has a zero net charge. Example is sodium.

Electronegativity is defined as the ability of an element to accept electrons to its shell during a chemical reaction for the formation of a stable bond structure.

During ionic bond formation, the elements involved tries to obtain an octet structure by either donating or accepting electrons.

Alkali metals( such as the neutral element of sodium? have the lowest electronegativities, while halogens have the highest.

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Explanation:

First, let's write the balanced equation of formation of MgCl2 from Mg and Cl2:

Mg + Cl2 → MgCl2

Now let's transform 10.0g of Mg into moles, using the following formula: moles = mass/molar mass

molar mass of Mg = 24.3 g/mol

moles = 10/24.3

moles = 0.412 moles

Now we use the equation ratio between Mg and MgCl2 to find the quantity of MgCl2 in moles.

1 mole of Mg produces 1 mole of MgCl2.

So 0.412 moles of Mg produces 0.412 moles of MgCl2.

Now we transform 0.412 moles of MgCl2 into mass using the following formula: mass = moles x molar mass

Molar mass of MgCl2: 24.3 + (2*35.45) = 95.21 g/mol

Mass = 0.412 * 95.21

Mass = 39.2 g

Answer: The theoretical yield of MgCl2 is 39.2 g.

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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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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Answer

The hydrogen ion concentration, [H⁺] is 3.327 x 10⁻⁵ M

The hydroxide ion concentration [OH⁻] is 3.01 x 10⁻¹⁰ M

The solution is acid.

Explanation

pH is a measure of how acidic or basic a solution is. The range goes from 0 - 14, with 7 being neutral. A pH of less than 7 indicates acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the solution.

Since pH of the solution is 4.478, then it means the solution is acid.

The hydrogen ion concentration, [H⁺] of the solution can be calculated using the pH formula.

Substituting pH as 4.478 into the formula, we have

The hydrogen ion concentration, [H⁺] is 3.327 x 10⁻⁵ M

The relation between the hydrogen ion concentration, [H⁺] and hydroxide ion concentration [OH⁻] is

So, substituting [H⁺] as 3.327 x 10⁻⁵ M, we have:

Hence, the hydroxide ion concentration [OH⁻] is 3.01 x 10⁻¹⁰ M

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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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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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.

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

2nd)

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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Answer

d. Thomson

Explanation

The given model shown above is Thomson's model of an atom.

In 1898, J. J. Thomson proposed that an atom is shaped like a sphere with a radius of approximately 10⁻¹⁰m, where the positive charge is uniformly distributed as shown in the model given. The electrons are embedded in this sphere so as to give the most stable electrostatic arrangement.

Thus, Thomson's model of an atom is also referred to as the watermelon model, the plum pudding model or the raisin pudding model.

An important aspect of Thomson's model of an atom is that it assumes that the mass of the atom is uniformly distributed over the atom. The model was successful in explaining the overall neutrality of the atom.

Answer:

The Chlorine atom has higher ionization energy.

Explanation:

Ionization energy is the energy needed to separate an electron from an atom of an element in the gaseous state.

In the Periodic Table of Elements, Ionization energy increases from bottom to top (in a group), and increases from left to right (in a period).

In the folowing drawing we can see the variation of the Ionization energy and the location of the magnesium atom and chlorine atom:

Magnesium atom and Chlorine atom are located in the same period, but Mg is in group 2 (left side) and Cl in in group 17 (right side), so the Chlorine atom has higher ionization energy.

NaOH

M = molarity (mol/L)

12.0 ml = 0.012 L

Answer: moles of NaOH = 1.32x10^-3 moles

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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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 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

A coefficient of 2 has been put in front of Na₃PO₄, so to balance Na coefficient in front of NaCl will be 6.

The balanced equation of the reaction is -

2 Na₃PO₄ + 3 MgCl₂ → Mg₃(PO₄)₂ + 6 NaCl

This is a complete balance chemical equation of the given reaction with coefficient 6 in front of NaCl to balance Na.

Here,

We've been given a chemical equation which is unbalanced. A coefficient of 2 has been put in front of Na₃PO₄ and we are asked about what coefficient should go in front of NaCl so that the sodium Na is balanced. Since, there were total 3 Na before the coefficient was placed, but after putting the coefficient of 2, Na is 2 x 3, which is 6.

Therefore, an integer 6 is to be put in front of NaCl to balance Na in the equation.

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Answer:

100ml x 0.774

divide by 4

x by 8

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:

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

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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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

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

32 grams

Diatomic elements are elements that contain two atoms chemically bonded together.

When looking for the molar mass of a diatomic element, the number of atoms in the element is multiplied by the molar mass of the element.

For instance, oxygen is a diatomic element with the chemical symbol of O₂. This shows that the molar mass of oxygen will be given as:

This shows that one mole of oxygen molecules would weigh 32 grams and not 16 grams.

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.

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

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: 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

Answer:

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