For each of the following equilibria, write the equilibrium constant expression for Kc.


1. BaSO4(s) <---->Ba2+(aq) + SO42-(aq)

2. CH3COOH (aq) + H2O (l) <--->CH3COO- (aq) + H3O+ (aq)

Answer:

observed?Brownian motion is the random movement of particles suspended in a fluid due to collisions with other molecules in the fluid. In this case, the food coloring molecules are suspended in the water, which is a fluid, and the random movement of the water molecules causes the food coloring molecules to move around in a random pattern. This movement is similar to the movement of atoms in a gas or liquid, which is also driven by Brownian motion. So, the concept of Brownian motion helps to explain the random movement of the food coloring molecules in the water, as observed in the experiment.

[tex]Molarity = \frac{Moles(solute)}{Volume(solution)}[/tex]

    ★    I hope it helps you :)........

it would take approximately 1.986 ×

[tex] {10}^{25} [/tex]

photons to heat 205 mL of coffee from 25.0 °C to 62.0 °C using microwave radiation with a wavelength of 12.4 cm.

The first step is to calculate the amount of energy required to heat the coffee. We can use the formula:

Q = mcΔT

where Q is the amount of energy required, m is the mass of the coffee, c is the specific heat capacity, and ΔT is the change in temperature.

The mass of the coffee can be calculated as:

m = density × volume

m = 0.997 g/mL × 205 mL = 204.485 g

ΔT = 62.0 °C - 25.0 °C = 37.0 °C

Q = (204.485 g) × (4.184 J/(g⋅K)) × (37.0 °C) = 31612.09 J

The next step is to calculate the energy per photon of the microwave radiation. We can use the formula:

E = hc/λ

where E is the energy per photon, h is Planck's constant, c is the speed of light, and λ is the wavelength of the radiation.

Converting the wavelength to meters:

λ = 12.4 cm = 0.124 m

[tex]E = (6.626 × 10^-34 J⋅s) × (2.998 × 10^8 m/s) / (0.124 m) = 1.594 × 10^-22 J/photon[/tex]

Finally, we can calculate the number of photons required by dividing the energy required to heat the coffee by the energy per photon of the microwave radiation:

Number of photons = Q / E

photon =

[tex]1.986 × {10}^{25} photons[/tex]

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The density of the gas would be 9.01 g/L.

To calculate the density (in g/L) of a gas, 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.

To solve for n/V (the number of moles of gas per unit volume), we can rearrange the ideal gas law:

n/V = P/RT

The density (in g/L) is then equal to the molar mass (in g/mol) times n/V:

density = (molar mass) * (n/V)

The molar mass of C₂H₂Cl₂ is:

2(12.01 g/mol) + 2(1.01 g/mol) + 2(35.45 g/mol) = 96.93 g/mol

To use the ideal gas law, we need to convert the temperature to Kelvin:

70.0C + 273.15 = 343.15 K

Plugging in the values:

P = 2.50 atm

V = unknown (we are not given the volume)

n/V = P/RT = 2.50 atm / (0.08206 Latm/(molK) * 343.15 K) = 0.0930 mol/L

molar mass = 96.93 g/mol

Therefore, the density of the C₂H₂Cl₂ gas at 70.0C and 2.50 atm of pressure is:

density = (molar mass) * (n/V) = 96.93 g/mol * 0.0930 mol/L = 9.01 g/L.

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There are 0.6 moles of sodium chloride in a 250 mL solution with a molarity of 2.4 M sodium chloride.

This leads us to the conclusion that a 250 mL solution of a 0.5 M sodium chloride contains 0.125 moles and 7.32 grammes of sodium chloride, respectively.

A solution with a concentration of 0.4 M contains 0.4 moles of solute per litre of solution. By utilising dimensional analysis, you may calculate how many moles of solute are present in 250 mL of the solution. litre and millilitre units

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Global winds form due to differential heating of the Earth's surface by the sun, creating convection currents in the atmosphere, which are influenced by the rotation of the Earth, resulting in circular wind patterns around the planet.

What causes global winds to form and why do they move in convection currents around Earth?

Global winds are caused by the differential heating of the Earth's surface by the sun. The sun heats the Earth's surface unevenly due to the varying angles of incidence of the sun's rays and the Earth's curvature. The equator receives more direct sunlight than the poles, which creates a temperature difference between these regions. This temperature difference causes the air to move from the equator to the poles, creating convection currents in the atmosphere.

These convection currents create global wind patterns that move in a circular pattern from the equator to the poles and back again. As the warm air rises near the equator, it moves towards the poles, where it cools and sinks back down to the surface. The cooler air near the poles then moves towards the equator to replace the rising warm air.

These wind patterns are also influenced by the rotation of the Earth, which causes the Coriolis effect. The Coriolis effect causes  wind to deflect to the right in the Northern-Hemisphere and to the far left in the Southern-Hemisphere.This deflection results in the formation of the trade winds, westerlies, and polar easterlies that are part of the global wind patterns.

In summary, the differential heating of the Earth's surface by the sun causes convection currents in the atmosphere, which create the global wind patterns. The rotation of the Earth influences these wind patterns, resulting in the formation of the trade winds, westerlies, and polar easterlies that move in a circular pattern from the equator to the poles and back again.

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To calculate the theoretical yield of aspirin, we need to know the balanced equation for the reaction between salicylic acid and acetic anhydride, which is:

salicylic acid + acetic anhydride → aspirin + acetic acid

The balanced equation tells us that one mole of salicylic acid reacts with one mole of acetic anhydride to produce one mole of aspirin and one mole of acetic acid.

The molar mass of salicylic acid is 138.12 g/mol, so 1.953 g is equal to:

1.953 g / 138.12 g/mol = 0.01414 mol salicylic acid

According to the balanced equation, one mole of salicylic acid produces one mole of aspirin. The molar mass of aspirin is 180.16 g/mol, so the theoretical yield of aspirin is:

0.01414 mol aspirin × 180.16 g/mol = 2.55 g aspirin

Therefore, the theoretical yield of aspirin from 1.953 g of salicylic acid is 2.55 g.

An acid is a chemical compound or substance that can donate hydrogen ions (H+) or accept electrons in chemical reactions, or a substance that can lower the pH of a solution by releasing H+ ions. Acids have a sour taste and can react with bases to form salts. They are commonly used in industries such as food, pharmaceuticals, and chemical manufacturing. Examples of common acids include hydrochloric acid, sulfuric acid, and acetic acid.

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The reason why Block A sinks while Block B floats is due to their relative densities.

What is density?

Density is defined as the mass of an object per unit volume, and it determines whether an object will float or sink in a fluid.

Block A must have a higher density than the water, causing it to sink. In contrast, Block B must have a lower density than the water, causing it to float.

Density can be calculated by dividing the mass of an object by its volume. Therefore, to determine why one block has a higher density than the other, we need to know their masses and volumes.

It's possible that Block A is made of a denser material such as iron, while Block B is made of a less dense material such as wood or plastic. Alternatively, it could be that Block A has a greater volume than Block B, or that Block B has a hollow space inside that reduces its overall density.

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Complete question is: Mrs. B sets up two beakers that contain the same amount of water. She has two blocks of different materials that she labels "A" and "B." She places one block in each beaker. Block A sinks and Block B floats. The reason why Block A sinks while Block B floats is due to their relative densities.

Since HCl is a strong acid, it completely dissociates in water. Therefore, the concentration of H⁺ in the solution is equal to the initial concentration of HCl, [H⁺] = 0.250 mol/L. Therefore, the pH of the solution can be:

pH = -log(0.250) = 0.602. Therefore, the pH of the solution resulting from the mixture of HCl and NH₂ is approximately 0.602, which is closest to option (A) 5.079.

pH is a measurement of the acidity or basicity of a solution. It is the negative logarithm of the concentration of hydrogen ions in the solution. A pH value of 7 is considered neutral, while values below 7 are acidic, and above 7 are basic.

Metals are not acidic or alkaline, as acidity and alkalinity are properties of solutions rather than the metals themselves. However, when metals react with acidic or alkaline solutions, they can produce ions that can affect the pH of the solution.

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The reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is exothermic reaction.

In exothermic reaction, energy is transferred into surroundings rather than taking energy from surroundings as in the endothermic reaction.

In this reaction, HCl reacts with NaOH to form water (H₂O) and sodium chloride (NaCl) while releasing energy in the form of heat. The reaction is as follows: HCl + NaOH → NaCl + H₂O + heat

This means that the reaction releases heat to the surroundings, and the temperature of the mixture increases. This is why this reaction is exothermic in nature.

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The charge of electrons is determined by their spin, which is either up or down and the same spin will repel each other due to their negative charge, while electrons with opposite spins will attract each other.

Electrons are negatively charged particles and exist in pairs because of the Pauli Exclusion Principle, which states that no two electrons in an atom can have the same set of quantum numbers. This means that if two electrons are in the same atom, they must have different energy levels, angular momenta, and magnetic moments. This prevents the electrons from occupying the same space and prevents them from having the same charge. As a result, electrons remain in pairs, even though they have the same charge.

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The example of an Everglade species adaptation among the given choices is: Alligators dig large holes in the mud that retain water during the dry season.

What are the alligators?

Alligators in the Everglades have adapted to survive the dry season by digging "gator holes" which are large depressions in the mud that retain water. These gator holes provide the alligators with a habitat to survive during the dry season and are also important for other species in the ecosystem. Other species such as fish, turtles, and wading birds also use these gator holes as a source of water during the dry season.

Zebras having striped colorations that help them hide from predators in the grasses is an example of an adaptation seen in savanna ecosystems. Raccoons stealing eggs from bird's nests is an example of behavior, but not an adaptation specific to the Everglades ecosystem. Therefore, the correct answer is: Only the first choice is an example of an Everglade species adaptation.

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Complete question is: The example of an Everglade species adaptation among the given choices is: Alligators dig large holes in the mud that retain water during the dry season.

To determine the number of moles of Al₂(SO₄)₃ present in 50.0 mL of 0.250 M Al₂(SO₄)₃, we need to use the formula relating molarity to moles and volume.

In chemistry, a mole is a unit of measurement used to show the measure of a chemical entity. One mole of a substance is defined as the amount of that substance that contains the same number of particles, such as atoms, molecules, or ions, as there are atoms in exactly 12 grams of carbon-12.

To determine the number of moles of Al₂(SO₄)₃  present in 50.0 mL of 0.250 M Al₂(SO₄)₃ , we need to use the formula:

Molarity (M) = moles (n) / volume (V)

Rearranging the formula, we get:

n= M*V

First, let's convert the volume of 50.0 mL to liters:

50.0 mL = 50.0 x 10⁻³ L

Next, we can substitute the given values into the formula:

moles of Al₂(SO₄)₃  = 0.250 M x 50.0 x 10⁻³ L

moles of Al₂(SO₄)₃  = 0.0125 mol

Therefore, there are 0.0125 moles of Al₂(SO₄)₃  present in 50.0 mL of 0.250 M Al₂(SO₄)₃.

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0.0652 moles of bromine gas would occupy a volume of 20 L at a pressure of 0.90 atm and a temperature of 90°C.

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, R is the ideal gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin by adding 273.15:

T = 90°C + 273.15 = 363.15 K

Next, we need to convert the pressure from atm to kPa:

0.90 atm x 101.3 kPa/atm = 91.17 kPa

Now we can plug in the values we have:

n = (PV) / (RT)

n = (91.17 kPa x 20 L) / (8.31 L kPa/K mol x 363.15 K)

n = 0.0652 mol.

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Problem 1:

The balanced chemical equation for the reaction between NaOH and the acid is:

NaOH + HX → NaX + H2O

where X represents the acid.

The stoichiometry of the reaction shows that one mole of NaOH reacts with one mole of the acid. Thus, the number of moles of acid required can be calculated as follows:

Moles of NaOH = volume (in L) x concentration (in M)

Moles of NaOH = 500 mL x (1 L/1000 mL) x 0.500 M

Moles of NaOH = 0.250 moles

Since the number of moles of the acid required is the same as the number of moles of NaOH, the amount of acid needed to reach the end-point is:

Moles of acid = 0.250 moles

The volume of the acid required can be calculated using its concentration:

Moles of acid = volume (in L) x concentration (in M)

0.250 moles = volume (in L) x 2 M

Volume of acid = 0.125 L or 125 mL

Therefore, 125 mL of the 2 M acid solution is required to reach the titration end-point.

Problem 2:

The balanced chemical equation for the reaction between NaOH and HCl is:

NaOH + HCl → NaCl + H2O

The stoichiometry of the reaction shows that one mole of NaOH reacts with one mole of HCl. Thus, the number of moles of NaOH used in the titration can be calculated as:

Moles of NaOH = volume (in L) x concentration (in M)

Moles of NaOH = 20.0 mL x (1 L/1000 mL) x 4.00 M

Moles of NaOH = 0.080 moles

Since one mole of NaOH reacts with one mole of HCl, the number of moles of HCl present in the 5.00 mL sample can be calculated as:

Moles of HCl = Moles of NaOH

Moles of HCl = 0.080 moles

The concentration of the HCl solution can be calculated as follows:

Concentration of HCl = moles/volume (in L)

Concentration of HCl = 0.080 moles/(5.00 mL x 1 L/1000 mL)

Concentration of HCl = 16.0 M

Therefore, the concentration of the HCl solution is 16.0 M.

Problem 3:

The balanced chemical equation for the reaction between H2SO4 and the base is:

H2SO4 + 2NaOH → Na2SO4 + 2H2O

The stoichiometry of the reaction shows that one mole of H2SO4 reacts with two moles of NaOH. Thus, the number of moles of NaOH used in the titration can be calculated as:

Moles of NaOH = volume (in L) x concentration (in M)

Moles of NaOH = 1.00 L x 1.0 M

Moles of NaOH = 1.0 moles

Since two moles of NaOH react with one mole of H2SO4, the number of moles of H2SO4 present in the solution is:

Moles of H2SO4 = 0.5 moles

The molarity of the base can be calculated as follows:

Molarity of base = moles/volume (in L)

Molarity of base = 0.5 moles/0.060 L

Molarity of base = 8.33 M

Decomposers are organisms that convert dead plants or animals into the nutrients needed by living vegetation.

The energy-transfer capacity of an environment depends on decomposers. They break down decaying organisms into simpler inorganic materials, releasing nutrients that can be used by main producers.

Decomposers are a class of organisms that make up the last component in the food chain. They decompose dead vegetation and animals and replenish the soil's essential nutrients. Because they are the original source of energy that is passed between other organisms, primary producers are crucial to the entire food chain.

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Explanation:

hybridization refers to the process of mixing atomic orbitals in a way that creates new hybrid orbitals. This is commonly observed in organic chemistry, where hybridization is used to explain the shapes and bonding properties of molecules.

The hybridization of atomic orbitals occurs when atoms bond to form molecules. In the hybridization process, the valence electrons of an atom are rearranged and redistributed in order to form new orbitals with different shapes and energies. This can result in stronger and more stable bonding between atoms.

The most common types of hybridization are sp, sp2, and sp3, which involve the mixing of s and p orbitals. For example, in the sp3 hybridization of carbon, the 2s orbital and three 2p orbitals are combined to form four sp3 hybrid orbitals, which are arranged in a tetrahedral shape.

The effects of hybridization in chemistry include changes in the bond angles, bond lengths, and overall shape of molecules. This can affect the reactivity and chemical properties of the molecule, such as its acidity or basicity.

In Experiment 1, we found the heat of solution of sodium hydroxide (NaOH) by dissolving 2.00 g of NaOH in 50.0 mL of water.

The temperature rose from 20°C to 28.5°C. The moles of NaOH were determined to be 0.0518 mol.

Using the specific heat of water (4.184 J/g°C), we calculated the enthalpy change (ΔH_sol) and compared it to the literature value, finding a percent error.

In Experiment 2, we measured the heat of neutralization between NaOH and 0.75 M HCl.

The temperature increased from 23.5°C to 27°C. We determined the moles of HCl, limiting reagent, and enthalpy change (ΔH_neut) for the neutralization reaction.

The actual value was compared to the literature value, and percent error was calculated.

Experimental errors in both experiments could arise from heat loss/gain, variations in room temperature and atmospheric pressure, and imprecise measurements.

The enthalpy changes in both experiments are due to bond breaking and forming during the dissociation of NaOH and the neutralization reaction between NaOH and HCl.

In conclusion, we determined the heat of solution for sodium hydroxide and the heat of neutralization between sodium hydroxide and hydrochloric acid, and analyzed the possible sources of experimental errors.

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Water is a tiny molecule.

it consists of three atoms : two of hydrogen and one of oxygen. Water molecules cling to each other because of a force called hydrogen bonding.

Because water is more quickly reduced than Na+ ions, the sodium metal that results from the electrolysis of aqueous NaCl is replaced at the cathode by hydrogen gas.

The positively charged salt in NaCl tends to travel towards the negatively charged substance in accordance with the law of attraction. Because the anode acts as a negatively charged diode during electrolysis, sodium moves towards the anode rather than the cathode.

When sodium is created, it immediately interacts with water molecules to create sodium hydroxide. You will therefore receive aqueous solution of sodium hydroxide and hydrogen gas rather than pure sodium metal.

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Here is a step-by-step guide for guiding students on how to write balanced chemical equations and ionic equations:

Steps:

1. Determine the reactants and products: Start by identifying the reactants and products in the chemical reaction. This involves reading the problem and identifying the substances that are being reacted.

2. Write the unbalanced equation: Once the reactants and products have been identified, write the unbalanced chemical equation using the chemical formulas for each reactant and product.

3. Balance the equation: To balance the equation, adjust the coefficients of the reactants and products so that the number of atoms of each element is equal on both sides of the equation. Begin by balancing the atoms of elements that appear only once on each side of the equation, and then move on to elements that appear more than once.

4. Check the balanced equation: After balancing the equation, double-check to make sure that the number of atoms of each element is the same on both sides of the equation.

5. Write the ionic equation: To write the ionic equation, break apart any soluble ionic compounds into their individual ions. Then, cancel out any spectator ions that appear on both sides of the equation.

6. Check the ionic equation: Double-check the ionic equation to make sure that the same number and type of ions appear on both sides of the equation.

7. (Optional) Include states of matter: It is common practice to include the states of matter (solid, liquid, gas, aqueous) of the reactants and products in the chemical equation. This can be done by using abbreviations in parentheses after each chemical formula.

By following these steps, students can learn how to write balanced chemical equations and ionic equations accurately and efficiently.

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Since it has a large concentration of hydrogen ions (H+) and a low concentration of hydroxide ions, an acid with a pH of 1 would be categorised as a strong acid. (OH-).

At the kinds of amounts you typically use in the lab, strong acids like hydrochloric acid have a pH between 0 and 1. At a quantity of 38%, hydrochloric acid (HCL) has a pH value of 1.1.

Muriatic acid is another name for hydrochloric acid. It has an unpleasant scent and is colorless. As an acidifying substance, it is employed. Since it is a powerful acid, its pH will be lower than 7. There is a pH spectrum of 1.5 to 3.5.

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The relationship between dipole moment, percent ionic character, bond length, and charge can be used to estimate the H-Br bond's length. The H-Br bond is thought to have a length of 144 picometers.

We may guess the charge on the H-Br bond given the dipole moment and percent ionic character:

Q = (μ / d) * (1 / 3.34×10^-30)

Ionic character percentage equals (Q / 1.610-19) x 100%

By condensing and figuring out d, we arrive at:

D is equal to / (0.208 * sqrt(percent ionic character)).

where d is in picometers and is in Debye.

Inputting the values provided yields:

144 pm is equal to d = 0.811 D / (0.208 * sqrt(12)).

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Answer:  A from the burial and decomposition of plant material.

Explanation:

Answer:

2.25 x 10^-5 moles or 1.355 x 10^19 atoms

Explanation:

Menthol has the chemical formula C10H20O, which means that for every 1 mole of oxygen (O) in a sample of menthol, there are 10 moles of carbon. So if there are 2.25 x 10^-6 moles of oxygen in a sample of menthol, then there are 10 * 2.25 x 10^-6 = 2.25 x 10^-5 moles of carbon in the same sample.

Since there are Avogadro’s number (6.022 x 10^23) atoms in one mole of any substance, there are 2.25 x 10^-5 moles * 6.022 x 10^23 atoms/mole = 1.355 x 10^19 atoms of carbon in the same sample.

Answer: It is homozygous recessive for blue eyes.

Explanation: If an individual has blue eyes, it means that they must have received two recessive alleles for eye color (bb) – one from each parent. Therefore, the genotype of an individual with blue eyes is homozygous recessive for blue eyes.

Based on the law of superposition, geologists can conclude that the limestone rock layer is younger than the sandstone layer below it.

This is because the law of superposition states that in an undisturbed sequence of rock layers, the oldest layer is at the bottom and the youngest layer is at the top. Therefore, since the sandstone layer is found below the limestone layer, it must be older.

The age of the limestone layer itself cannot be determined solely based on the law of superposition. While geologists can infer that the limestone layer is younger than the underlying sandstone layer, they would need to use other methods such as radiometric dating to determine the actual age of the rock layer.

Similarly, the presence of fossils in the limestone layer cannot be determined based solely on the law of superposition. While it is possible that the limestone layer may contain fossils, this would need to be confirmed through further investigation and analysis.

The age of another layer 100 kilometers away also cannot be determined solely based on the law of superposition. While the law of superposition can provide information about the relative ages of rock layers within a local area, it cannot be used to compare the ages of rock layers in different locations.

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22.49 grams of aluminum will react fully with 1.25 moles of [tex]Cl_{2}[/tex].

What is Moles?

Moles is a unit of measurement used in chemistry to express the amount of a substance. One mole of a substance is defined as the amount of that substance that contains the same number of particles (atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12.

To determine the mass of aluminum that will react fully with 1.25 moles of [tex]Cl_{2}[/tex], we need to use the stoichiometry of the balanced chemical equation.

From the balanced chemical equation:

2 Al + 3 [tex]Cl_{2}[/tex] → 2 Al[tex]Cl_{3}[/tex]

we can see that 2 moles of Al react with 3 moles of [tex]Cl_{2}[/tex] to produce 2 moles of Al[tex]Cl_{3}[/tex]. Therefore, the mole ratio of Al to [tex]Cl_{2}[/tex] is 2:3.

To calculate the amount of Al required to react with 1.25 moles of [tex]Cl_{2}[/tex], we can set up the following proportion:

2 moles Al / 3 moles [tex]Cl_{2}[/tex] = x moles Al / 1.25 moles [tex]Cl_{2}[/tex]

where x is the number of moles of Al required.

Solving for x, we get:

x = (2/3) * 1.25 = 0.8333 moles Al

Finally, we can use the molar mass of aluminum to convert moles to grams:

mass of Al = number of moles of Al * molar mass of Al

mass of Al = 0.8333 mol * 26.98 g/mol

mass of Al = 22.49 g

Therefore, 22.49 grams of aluminum will react fully with 1.25 moles of C[tex]Cl_{2}[/tex].

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