Compute the mass of KI needed to prepare 500 mL of a 0. 750 M solution

1. Xylene will react with bromine solution to undergo electrophilic aromatic substitution, where bromine will replace one of the hydrogen atoms on the aromatic ring.

2. Xylene will not react with KMnO₄ under normal conditions as it is a relatively stable aromatic compound.

3. Xylene can react with AlCl₃ and CHCl₃ under Friedel-Crafts conditions to form a substituted product. AlCl₃ acts as a Lewis acid, facilitating the reaction by generating a carbocation intermediate, which is then attacked by the chloride ion from CHCl3 to form a substituted product.

In summary, xylene will undergo electrophilic aromatic substitution with bromine solution, will not react with KMnO₄, and can undergo Friedel-Crafts reaction with AlCl₃ and CHCl₃ to form a substituted product.

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When sodium chloride solution is added to lead nitrate solution then it results in the formation of a precipitate of lead chloride and sodium nitrate.

Precipitation reactions occur when cations and anions in aqueous solution combine to form an insoluble ionic solid called a precipitate. Whether or not such a reaction occurs can be determined by using the solubility rules for common ionic solids Percent composition tells you which types of atoms (elements) are present in a molecule and their levels. Percent composition can also tell you about the different elements present in an ionic compound as well.

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The volume of oxygen gas produced at STP when 3.81 g of Mg(ClO₃)₂ decomposes is 0.511 L.

When magnesium chlorate (Mg(ClO₃)₂) is decomposed, oxygen gas and magnesium chloride are produced. To find the volume of oxygen gas at STP when 3.81 g of Mg(ClO₃)₂ decomposes, follow these steps:

1. Write the balanced chemical equation for the decomposition of magnesium chlorate:
  Mg(ClO₃)₂ (s) → 2ClO₂ (g) + MgCl₂ (s)

2. Calculate the molar mass of Mg(ClO₃)₂:
  Mg: 24.31 g/mol
  Cl: 35.45 g/mol (2 Cl atoms)
  O: 16.00 g/mol (6 O atoms)
  Total: 24.31 + (2 x 35.45) + (6 x 16.00) = 167.21 g/mol

3. Determine the moles of Mg(ClO₃)₂:
  Moles = (mass of Mg(ClO₃)₂) / (molar mass of Mg(ClO₃)₂)
  Moles = 3.81 g / 167.21 g/mol ≈ 0.0228 mol

4. Use the balanced equation to find the moles of oxygen gas produced:
  From the equation, 1 mol of Mg(ClO₃)₂ produces 1 mol of O₂. Therefore, 0.0228 mol of Mg(ClO₃)₂ will produce 0.0228 mol of O₂.

5. Use the molar volume of a gas at STP (22.4 L/mol) to find the volume of O₂ produced:
  Volume of O₂ = (moles of O₂) x (molar volume at STP)
  Volume of O₂ = 0.0228 mol x 22.4 L/mol ≈ 0.511 L

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If 4 moles of a gas are at a pressure of 105. 6 kpa and a volume of 12 liters, the temperature of the gas is 399.36 K.

To solve this problem, we can use the ideal gas law: PV = nRT, where P is the pressure, V is the volume, n is the number of moles of gas, R is the gas constant, and T is the temperature in kelvin. Rearranging the equation, we get T = PV/nR.

Substituting the given values, we have:

T = (105.6 kPa)(12 L) / (4 mol)(8.31 J/(mol*K))

Simplifying, we get:

T = 399.36 K

Therefore, the temperature of the gas is 399.36 K, or 126.21°C.

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Magnesium metal will conduct electricity via mobile electrons whether it is in the solid or liquid state.

Magnesium oxide will not conduct electricity in the solid state as they are no mobile charge carriers.

Molten (liquid) magnesium oxide has mobile ions and these can transfer electrons via mobile ions. This is electrolysis and the compound is turned back into its elements (magnesium and oxygen).

Both 1.0 mol of calcium (Ca) and 1.0 mol of magnesium (Mg) contain the same number of atoms (Avogadro's number, 6.022 x 10²³ atoms), but they differ in mass and chemical properties.

In order to compare 1.0 mol Ca and 1.0 mol Mg, we must first understand the concept of a mole. A mole is a unit of measurement that represents 6.022 x 10²³ particles (atoms, molecules, ions, etc.). This number, known as Avogadro's number, allows us to compare amounts of different substances.

Although 1.0 mol Ca and 1.0 mol Mg both contain the same number of atoms, their masses are different. The molar mass of Ca is 40.08 g/mol, while the molar mass of Mg is 24.31 g/mol.

Therefore, 1.0 mol Ca has a mass of 40.08 g, and 1.0 mol Mg has a mass of 24.31 g. Additionally, Ca and Mg are both alkaline earth metals but possess different chemical properties, such as reactivity and electron configurations.

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Answer:

yes acid can nuetralize bases

Answer:

Yes!

Explanation:

Strong Acids neutralize Strong bases.

When they react, water is formed. Whatever ions are left over, they become salt.

There must be an equal moles of strong acid and strong base.

The pressure of the Hydrogen gas sample is approximately 29.4 atm.

To find the pressure of the 4.25 moles of Hydrogen gas at 20.0°C and occupying a volume of 25.0 L, we can use the ideal gas law formula: PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant (8.314 J/mol·K), and T is the temperature in Kelvin.

First, convert the temperature to Kelvin: 20.0°C + 273.15 = 293.15 K.

Now, rearrange the formula to solve for pressure: P = nRT/V

Substitute the values: P = (4.25 moles) × (8.314 J/mol·K) × (293.15 K) / (25.0 L)

Calculate the pressure: P ≈ 3921.2 J/L

Since 1 J/L = 0.00750062 atm, convert the pressure to atm: P ≈ 3921.2 J/L × 0.00750062 atm/J·L ≈ 29.4 atm

So, the pressure of the Hydrogen gas sample is approximately 29.4 atm.

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This attraction is known as hydrogen bonding, which occurs when a hydrogen atom that is covalently bonded to one electronegative atom (such as oxygen) is attracted to another electronegative atom in another molecule. In the case of water molecules, the hydrogen atoms have a partial positive charge and the oxygen atoms have a partial negative charge due to differences in electronegativity. This allows for the formation of hydrogen bonds between adjacent water molecules. The hydrogen bonding gives water its unique properties such as high boiling point and surface tension.

The ball would experience a net force of 0 N and would not move in either direction.

When the boy kicks the ball with a force of 40 N, he applies a force in one direction. At the same moment, a gust of wind blows in the opposite direction of the kick with a force of 40 N. These two forces act in opposite directions, and therefore cancel each other out.

According to Newton's first law of motion, an object at rest will remain at rest, and an object in motion will continue in motion in a straight line at a constant speed, unless acted upon by a net external force. In this case, the net force on the ball is 0 N, which means that the ball will not move in either direction.

This scenario highlights the importance of understanding net forces when analyzing the motion of objects. In the absence of a net force, the ball will not accelerate, and its velocity will remain constant.

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78.2 grams of oxygen (O₂) reacted with copper (Cu) to produce copper (II) oxide (CuO). When the oxygen reacts with 4.88 moles of copper, it will produce 9.76 moles of copper oxide (CuO).

The balanced chemical equation for the reaction between oxygen and copper is:

2Cu + O₂ → 2CuO

From the equation, we see that 1 mole of O₂ reacts with 2 moles of Cu to produce 2 moles of CuO.

First, we need to convert the given mass of O₂ to moles:

78.2 g O₂ × (1 mol O₂/32.00 g O₂) = 2.44 mol O₂

According to the stoichiometry of the balanced equation, 2 moles of Cu are required for every 1 mole of O₂ reacted. Therefore, the moles of Cu needed can be calculated as:

2.44 mol O₂ × (2 mol Cu/1 mol O₂) = 4.88 mol Cu

So, 4.88 moles of Cu will react with 78.2 grams of O₂ to produce 9.76 moles of CuO.

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Extraction is a useful technique for separating and purifying mixtures of compounds based on differences in their physical properties and reaction types.

The physical property used in extraction is the solubility of a compound in a particular solvent. If a compound is more soluble in one solvent than another, it can be selectively extracted and separated from the mixture.

For example, if a mixture contains both water-soluble and oil-soluble compounds, the mixture can be extracted with water to separate the water-soluble compounds, and then extracted with an organic solvent to separate the oil-soluble compounds.

The reaction type used in extraction is often acid-base chemistry. If a mixture contains both acidic and basic compounds, they can be selectively extracted by adjusting the pH of the solvent.

For example, if a mixture contains both an acidic carboxylic acid and a basic amine, the mixture can be extracted with a basic solvent to selectively extract the amine, and then extracted with an acidic solvent to selectively extract the carboxylic acid.

Overall, extraction is a powerful technique for separating and purifying mixtures of compounds, and its effectiveness depends on the physical properties and reaction types of the compounds in the mixture.

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The phases of the moon are a result of the relative positions of the sun, the earth, and the moon. Option A is correct.

As the moon orbits around the earth, the amount of sunlight that reflects off its surface changes, causing the different phases. When the moon is between the sun and the earth, we see a new moon. When the earth is between the sun and the moon, we see a full moon. When the moon is at a right angle to the earth and the sun, we see a quarter moon.

The size of the moon has no effect on the phases, as it appears to be the same size regardless of the phase. The number of craters on the moon is also unrelated to the phases. Therefore, Student A's explanation is the most accurate and supported by scientific evidence.  Option A is correct.

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E. None of these compounds should be soluble in pentane. Pentane is a nonpolar solvent, meaning it will dissolve other nonpolar molecules, but not polar or ionic molecules.

Acetic acid is polar, while pentanol and ethyl methyl ketone have polar functional groups. Benzene is nonpolar, but larger than pentane, so it is unlikely to dissolve well in it.

Acetic acid is a colorless liquid organic compound with the chemical formula CH3COOH. It is also known as ethanoic acid and is a weak acid. It is a pungent-smelling liquid that is commonly used as a solvent, as a food preservative, and in the manufacture of various chemicals. Acetic acid is the main component of vinegar, and it is also used as a reagent in laboratory experiments. In the body, acetic acid is produced during the metabolism of carbohydrates and fats.

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Using an ice bath to cool the solution is most likely to reduce the concentration of sodium chloride in the solution. Option D is correct.

When a solution is cooled, the solubility of most solids decreases. As a result, some of the sodium chloride may precipitate out of the solution, reducing the concentration of the solute. The other options listed would not reduce the concentration of sodium chloride in the solution.

Heating the solution on a hot plate could potentially increase the solubility of sodium chloride and lead to more dissolving, whereas adding more sodium chloride would only increase the concentration. Removing some solution with a pipette would not change the concentration, as the amount of solute would remain the same in the remaining solution. Hence Option D is correct.

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The balanced oxidation-reduction reaction is 2Fe³⁺(aq) + 2Hg(l) + 2Cl⁻(aq) → 2Fe²⁺(aq) + Hg₂Cl₂(s).

The given oxidation-reduction reaction is: 2Fe³⁺(aq) + 2Hg(l) + 2Cl⁻(aq) → 2Fe²⁺(aq) + Hg₂Cl₂(s).

Here is a step-by-step explanation of the reaction:
1. Identify the oxidation and reduction half-reactions:
- Oxidation: Hg(l) → Hg²⁺ + 2e⁻ (loss of electrons)
- Reduction: Fe³⁺ + e⁻ → Fe²⁺ (gain of electrons)

2. Balance the half-reactions:
- Oxidation: 2Hg(l) → Hg₂²⁺ + 4e⁻ (multiplied by 2 to balance electrons)
- Reduction: 2Fe³⁺ + 2e⁻ → 2Fe²⁺ (already balanced)

3. Add the half-reactions together:
2Fe³⁺ + 2Hg(l) + 2e⁻ → 2Fe²⁺ + Hg₂²⁺ + 4e⁻

4. Cancel the electrons on both sides:
2Fe³⁺ + 2Hg(l) → 2Fe²⁺ + Hg₂²⁺

5. Combine the remaining ions to form the final products:
2Fe³⁺(aq) + 2Hg(l) + 2Cl⁻(aq) → 2Fe²⁺(aq) + Hg₂Cl₂(s)

So, the balanced oxidation-reduction reaction is 2Fe³⁺(aq) + 2Hg(l) + 2Cl⁻(aq) → 2Fe²⁺(aq) + Hg₂Cl₂(s).

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The equilibrium concentration of each species for the complex ion 0.500M [tex]Co(NH_3)^6+3[/tex] can be calculated using the dissociation constant (Kd) of 2.2 x 10^-34.

The dissociation reaction for the complex ion is:

[tex]Co(NH_3)^6+3[/tex]⇌ ]tex]Co_3[/tex]+ [tex]6NH_3[/tex]

The equilibrium constant expression for this reaction is:

Kd = [Co3+] [NH3]^6 / [Co(NH3)6+3]

We can assume that x moles of Co(NH3)6+3 dissociates to form x moles of Co3+ and 6x moles of NH3. Therefore, the equilibrium concentrations of the species are:

[Co(NH3)6+3] = 0.500 - x
[Co3+] = x
[NH3] = 6x

Substituting these values into the equilibrium constant expression and solving for x gives:

Kd = [x] [6x]^6 / [0.500 - x]
2.2 x 10^-34 = 46656 x^7 / (0.500 - x)

Since Kd is very small, we can assume that x is much smaller than 0.500. Therefore, we can approximate 0.500 - x as 0.500.

2.2 x 10^-34 = 46656 x^7 / 0.500
x = 2.38 x 10^-6 M

Therefore, the equilibrium concentrations of each species are:

[Co(NH3)6+3] = 0.500 - x = 0.49999762 M
[Co3+] = x = 2.38 x 10^-6 M
[NH3] = 6x = 1.43 x 10^-5 M

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Robert Millikan later determined electron's charge in his "oil drop" experiments.

J.J. Thomson conducted experiments in the late 19th century where he used an electric field to deflect a beam of particles, known as a "cathode ray." These cathode rays were generated by applying a high voltage to a partially evacuated glass tube. Thomson observed that the beam was deflected towards the positive electrode, suggesting that the particles in the cathode ray had a negative charge. This led him to the discovery of the first subatomic particle, the electron.

Robert Millikan later conducted experiments to determine the charge of the electron. His famous "oil drop" experiments involved suspending tiny droplets of oil in an electric field and measuring the force required to keep them stationary. By measuring the charge on the oil droplets and the electric field strength, he was able to calculate the charge of the individual electrons that were present in the oil droplets. The discovery of the electron and its properties paved the way for future developments in particle physics and quantum mechanics. Today, we understand that atoms are made up of a nucleus composed of protons and neutrons, surrounded by electrons that orbit the nucleus in energy levels.

The conclusion is J. J. Thomson discovered the first subatomic particle, the electron, by deflecting a "cathode ray" beam with an electric field. Robert Millikan later determined that particle's charge in his "oil drop" experiments. The discovery of the electron was a crucial step in our understanding of the nature of matter and the structure of the universe.

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It takes 6 litres of a 2.4 M calcium hydroxide solution to produce 14.4 mol.

Calcium hydroxide is a commonly used chemical compound in industries like construction, agriculture, and food production. It is used in the production of cement, as a soil amendment to neutralize acidic soils, and in the processing of beet sugar. In food production, it is used as a processing aid, pH regulator, and firming agent.

To find the volume of a 2.4 M solution of calcium hydroxide required to yield 14.4 mol, we can use the formula:

moles = concentration x volume

Rearranging the formula to solve for volume, we get:

volume = moles / concentration

Plugging in the given values, we get:

volume = 14.4 mol / 2.4 M

volume = 6 L

Therefore, 6 liters of a 2.4 M solution of calcium hydroxide are required to yield 14.4 mol.

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The presence of the ions in the HCl would make the solution to conduct electricity.

Because it separates into ions (H+ and Cl-) when hydrochloric acid is dissolved in water, HCl (hydrochloric acid) solution conducts electricity. The electric charge of the H+ and Cl- ions allows them to travel and convey current across the solution.

The dissociation constant (Ka) of HCl describes how much of the compound separates into ions depending on the concentration of the solution. A higher HCl concentration will produce more ions, which will increase conductivity.

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If we had a 32-gram sample of C-14 today, there would be 4 grams of C-14 remaining in 10,470 years.

The half-life of C-14 is 5370 years, which means that in 5370 years, half of the original sample of C-14 would decay. After another 5370 years, half of what remains would decay, and so on.

This can be modeled by the equation:

[tex]N = N_0(1/2)^{(t/T)[/tex]

Where:

N is the amount of C-14 remaining after time t

N₀ is the initial amount of C-14

T is the half-life of C-14

Using the given information, we can substitute N₀ = 32 g, T = 5370 years, and t = 10,470 years into the equation to find N:

[tex]N = 32 g \cdot (1/2)^{(\frac{10,470 years}{5370 years})[/tex]

N = 4 g

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ans.

blank 1 = 1

blank 2 = 5

blank 3 = 3

blank 4 = 4

D. A mountain range with folded layers of rock.

Intense compression can cause the rock layers to fold, creating a mountain range. This type of feature forms suddenly in the geological timescale, as a result of tectonic activity, and is known as a fold mountain.

The intense pressure causes the rock layers to buckle and deform, resulting in folds, faults, and other features. The Appalachian Mountains and the Rocky Mountains are examples of fold mountains in the United States.

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In the given chemical equation:

Fe(NO3)2 + Al → Fe + Al(NO3)3

Iron (Fe) is being reduced because it is gaining electrons and its oxidation state is decreasing from +2 to 0 (elemental state).

Aluminum (Al) is being oxidized because it is losing electrons and its oxidation state is increasing from 0 (elemental state) to +3.

Therefore, Fe(NO3)2 is the oxidizing agent, and Al is the reducing agent in this reaction.

The dry gas would occupy 1.46 L at standard conditions.

When gas is collected over water, the vapor pressure of the water affects the total pressure measured. To account for this, we need to use Dalton's law of partial pressure, which states that the total pressure of a gas mixture is the sum of the partial pressures of each gas component.

First, we need to calculate the partial pressure of the collected gas. We can do this by subtracting the vapor pressure of water at 20 degrees Celsius (17.5 mm Hg) from the total pressure measured:

Partial pressure of gas = total pressure - vapor pressure of water
Partial pressure of gas = 622.0 mm Hg - 17.5 mm Hg
Partial pressure of gas = 604.5 mm Hg

Next, we can use the ideal gas law (PV = nRT) to calculate the volume of the dry gas at standard conditions (0 degrees Celsius and 1 atm):

PV = nRT
V = nRT/P

where P is the partial pressure of the gas (604.5 mm Hg converted to atm), n is the number of moles of gas (which we can calculate using the volume of the collected gas and the known molar volume of a gas at STP), R is the gas constant, and T is the temperature in Kelvin (273 K).

V = (40 L)(0.0821 L·atm/mol·K)(293 K)/(0.793 atm)
V = 1.46 L

Therefore, the dry gas would occupy 1.46 L at standard conditions.

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To produce 235 mL of a 1.77 M H₂SO₄ solution from an 18.0 M H₂SO₄ solution, you would need 27.54 mL of the concentrated solution.

To find this, we can use the dilution formula: M₁V₁ = M₂V₂. Here, M₁ is the initial concentration (18.0 M), V₁ is the volume required, M₂ is the final concentration (1.77 M), and V₂ is the final volume (235 mL).

1. Rearrange the formula to solve for V₁: V₁ = (M₂V₂) / M₁
2. Plug in the given values: V₁ = (1.77 M × 235 mL) / 18.0 M
3. Calculate the result: V₁ = 27.54 mL

Therefore, you would need 27.54 mL of the 18.0 M H₂SO₄ solution to produce 235 mL of a 1.77 M H₂SO₄ solution.

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There are 3.95 grams of [tex]LiCl[/tex] in the solution.

The density of the solution is 1.46 g/mL, so the volume of the solution is:

volume = mass / density

volume = 85.0 g / 1.46 g/mL

volume = 58.22 mL

The concentration of the solution is 1.60 M, which means there are 1.60 moles of [tex]LiCl[/tex] in 1 liter of solution. To find the number of moles of [tex]LiCl[/tex]in the 58.22 mL of solution, we can use the following equation:

moles = concentration x volume (in liters)

First, we need to convert the volume of the solution to liters:

volume = 58.22 mL / 1000 mL/L

volume = 0.05822 L

Now we can calculate the number of moles of [tex]LiCl[/tex] in the solution:

moles = 1.60 M x 0.05822 L

moles = 0.0932 moles

Finally, we can calculate the mass of[tex]LiCl[/tex]in the solution using its molar mass:

mass = moles x molar mass

mass = 0.0932 moles x 42.39 g/mol

mass = 3.95 g

Therefore, there are 3.95 grams of [tex]LiCl[/tex] in the solution.

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The molarity of the glucose solution is 6.66 M.

To determine the molarity of the glucose solution, we first need to convert the percentage concentration to grams of glucose per milliliter of solution.

Since the solution is labeled as 20%, we know that there are 20 grams of glucose in 100 milliliters of solution.

We can then use the density of the solution to convert from milliliters to grams:

1.20 g/mL x 100 mL = 120 g

So, there are 120 grams of glucose in the entire solution.

Now, we can calculate the number of moles of glucose using its molar mass, which is 180.16 g/mol:

moles of glucose = mass of glucose / molar mass = 120 g / 180.16 g/mol = 0.666 moles

Finally, we can calculate the molarity of the solution:

molarity = moles of solute / volume of solution in liters

We know that the volume of the solution is 100 mL or 0.1 L:

molarity = 0.666 moles / 0.1 L = 6.66 M

Therefore, the molarity of the glucose solution is 6.66 M.

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To solve this problem, we first need to write and balance the chemical equation for the reaction between strontium chloride and sulfuric acid:

SrCl2 + H2SO4 → SrSO4 + 2HCl

According to the balanced chemical equation, one mole of strontium chloride reacts with one mole of sulfuric acid to produce one mole of strontium sulfate and two moles of hydrochloric acid.

Next, we need to calculate the number of moles of sulfuric acid we have:

moles of H2SO4 = mass of H2SO4 / molar mass of H2SO4

moles of H2SO4 = 300.0 g / 98.08 g/mol

moles of H2SO4 = 3.057 mol

Finally, we can use the stoichiometry of the balanced chemical equation to determine the number of moles of strontium chloride that will react with 3.057 moles of sulfuric acid:

moles of SrCl2 = moles of H2SO4

moles of SrCl2 = 3.057 mol

Now we can calculate the mass of strontium chloride using its molar mass:

mass of SrCl2 = moles of SrCl2 x molar mass of SrCl2

mass of SrCl2 = 3.057 mol x 158.53 g/mol

mass of SrCl2 = 485.1 g

Therefore, 485.1 grams of strontium chloride will react with 300.0 grams of sulfuric acid.

Explanation:

To solve this problem, we use stoichiometry, which is a method that relates the amount of reactants and products in a chemical reaction based on their balanced chemical equation. In this case, we first write and balance the chemical equation for the reaction between strontium chloride and sulfuric acid. Then, we calculate the number of moles of sulfuric acid given its mass and molar mass. Next, we use the stoichiometry of the balanced chemical equation to determine the number of ontium chloride that will react with the given amount of sulfuric acid. Finally, we calculate the mass of strontium chloride using its molar mass and the calculated number of moles. By following these steps, we can determine the mass of strontium chloride that will react with 300.0 grams of sulfuric acid.

CsBr has a larger lattice energy than LiCl because Cs+ has a larger ionic radius and a greater charge than Li+.

The lattice energy of an ionic compound is determined by the strength of the electrostatic attraction between the ions in the solid crystal lattice. This attraction is influenced by the charges on the ions and the distance between them. The larger the charge on the ions, the greater the lattice energy, and the smaller the distance between them, the greater the lattice energy.

Br- also has a greater charge density than Cl-, making the electrostatic attraction between Cs+ and Br- stronger than that between Li+ and Cl-. Therefore, CsBr has a higher lattice energy than LiCl.

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