Ag2S forms a black precipitate and CdS forms a dark yellow precipitate. A solution of CdS is prepared by dissolving 0. 25 moles of solid CdS in distilled water. When equilibrium is established, a small amount of dark yellow solid remains on the bottom. A 0. 25 mol if solid AgNO3 is then stirred into the beaker, and the dark yellow precipitate is replaced with a black precipitate.


I. Did the following equilibrium shift after the AgNO3 was added? Explain using 2-3 sentences.


CdS (s) equilibrium arrows Cd 2+ (aq) + S 2- (aq)


II. Which compound has the larger Ksp value? Justify your answer

amino acids form polymeric proteins, which are made up of many amino acid monomers linked together by peptide bonds.

Proteins are made up of amino acids, which are linked together by peptide bonds to form long chains known as polypeptides. Polypeptide chains can fold and interact with one another to form complex three-dimensional structures known as proteins.

Proteins range in size from small proteins made up of only a few amino acids to large proteins made up of thousands of amino acids. Protein regularity varies as well, with some proteins having highly repetitive sequences and others having more irregular structures.

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Every fraction from crude oil contains hydrocarbons with a similar number of carbon and hydrogen atoms.

Hydrocarbons are organic compounds that are composed of hydrogen and carbon atoms. The number of carbon atoms in a hydrocarbon molecule determines its physical and chemical properties, such as its boiling point, density, and viscosity. The hydrocarbons found in crude oil can be separated into different fractions through a process called fractional distillation, which separates them based on their boiling points.

Each fraction typically contains hydrocarbons with similar carbon chain lengths, which can range from a few carbon atoms to over 50 carbon atoms.

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[tex] \mathbb{ANSWER:}[/tex]

A beam of light distinguishes a colloid from a solution. The particles in a colloid will scatter light, making the beam visible.

Answer:

Here are the names of the esters and the corresponding alcohols and carboxylic acids that were used to make them:

1. Ethyl acetate, made from ethanol and acetic acid

2. Methyl propanoate, made from methanol and propanoic acid

3. Butyl butyrate, made from butanol and butyric acid

4. Octyl formate, made from octanol and formic acid

5. Ethyl benzoate, made from ethanol and benzoic acid

6. Ethyl propionate, made from ethanol and propanoic acid

7. Methyl butyrate, made from methanol and butyric acid

8. Ethyl butyrate, made from ethanol and butyric acid

9. Propyl formate, made from propanol and formic acid

10. Butyl propionate, made from butanol and propanoic acid.

The energy released when 1 kg of water vapor condenses into 1 kg of liquid water is known as the heat of condensation, and it has a value of 2,260 kJ/kg. This means that for every kilogram of water vapor that condenses, 2,260 kJ of energy is released as heat.

How to calcalculate total amount of heat?

To calculate the total amount of heat released by the condensing water from Hurricane Isabel, we first need to know the total amount of water that was present in the hurricane. Once we have this value, we can multiply it by the heat of condensation (2,260 kJ/kg) to find the total amount of heat released.

For example, if the total amount of water from Hurricane Isabel was 1,000 kg, then the total amount of heat released would be:

Total heat released = 2,260 kJ/kg x 1,000 kg = 2,260,000 kJ

Therefore, the total amount of heat released by the condensing water from Hurricane Isabel depends on the amount of water that was present in the hurricane, and we need this information to make a specific calculation.

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The mistake is made in step 1.

2C4H10 + 13 O2 → 8 CO2 + 10 H2O

From the equation, we see that 2 mole of butane reacts with 13 moles of oxygen to produce 10 moles of water.

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

1500 g H2O ÷ 18.015 g/mol H2O = 83.284 mol H2O

Next, we can use stoichiometry to calculate the moles of butane required to produce this amount of water:

83.284 mol H2O × 2 mol C4H10 ÷ 10 mol H2O = 16.657 mol C4H10

Finally, we can convert moles of butane to grams:

16.657 mol C4H10 × 58.12 g/mol C4H10 = 967.79 g C4H10

Thus, the mistake in the calculation was made in the first step where the given mass of water is to be converted to moles.

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LiAlH₄ contains H with an oxidation number of -1, K₂CO₃ and KMnO₄ contain O with oxidation numbers of -2 and -2, respectively, while Li contains +1, Al contains +3, K contains +1, C contains +4, S contains +6, and Mn contains +7 and K₂SO₄ also has O with oxidation number of -2

The oxidation number of an element is a measure of the number of electrons that an atom has gained or lost when it forms a chemical bond. To calculate the oxidation number of the elements in the following compounds, we follow the following rules:

The oxidation number of an element in its elemental state is always zero.

The sum of oxidation numbers of all atoms in a compound is equal to the charge on the compound.

The oxidation number of hydrogen is usually +1, except when it is combined with a metal, in which case it is -1.

The oxidation number of oxygen is usually -2, except when it is combined with a peroxide, in which case it is -1, or with fluorine, in which case it is +2.

Using these rules, we can calculate the oxidation numbers of the elements in the following compounds:

LiAlH₄:

The oxidation number of Li is +1.

The oxidation number of Al is +3.

The oxidation number of H is -1.

Therefore, the oxidation number of H in LiAlH₄ is -1.

K₂CO₃:

The oxidation number of K is +1.

The oxidation number of C is +4.

The oxidation number of O is -2.

Therefore, the oxidation number of O in K₂CO₃is -2.

KMnO₄ :

The oxidation number of K is +1.

The oxidation number of Mn is +7.

The oxidation number of O is -2.

Therefore, the oxidation number of O in KMnO₄  is -2.

K₂SO₄:

The oxidation number of K is +1.

The oxidation number of S is +6.

The oxidation number of O is -2.

Therefore, the oxidation number of O in K₂SO₄ is -2.

In summary, LiAlH₄ has H with oxidation number of -1, K₂CO₃ and KMnO₄ have O with oxidation number of -2, and K₂SO₄also has O with oxidation number of -2, while Li has +1, Al has +3, K has +1, C has +4, S has +6, and Mn has +7.

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Answer:

The Chernobyl disaster of 1986 was a nuclear accident that had a significant impact on the environment and the living organisms in the surrounding area. The abiotic factors, including radiation and temperature changes, had a profound impact on the biotic factors, including plants and animals.

Radiation: One of the primary abiotic factors that impacted the biotic factors in Chernobyl was radiation. The explosion at the nuclear reactor released large amounts of radioactive material into the environment, which had a devastating impact on the plants and animals in the area. Many of the trees and plants in the surrounding forests died, and the animals that ate these plants were also affected. The radiation also caused genetic mutations in many of the organisms in the area.

Soil: The soil in the area was also impacted by the radiation, which caused changes in the nutrient levels and pH levels. This made it more difficult for plants to grow and survive in the area, and it also impacted the animals that depended on these plants for food.

Temperature: The temperature in the area was also impacted by the radiation, which caused changes in the weather patterns. The increased levels of radiation also caused higher temperatures in the area, which made it more difficult for plants and animals to survive.

Overall, the abiotic factors, including radiation, soil, and temperature changes, had a significant impact on the biotic factors in Chernobyl. Many of the plants and animals in the area were negatively impacted, and the ecosystem in the surrounding area was altered in ways that are still being studied today.

The molarity of the solution is 1.253 M.  To find the molarity of the solution, we first need to calculate the number of moles of CuSO4 in the solution.

The molar mass of CuSO4 is

63.55 + 32.07  + (4 x 16.00 ) g/mol  = 159.62 g/mol.

Next, we can use the equation moles = mass / molar mass to find the number of moles of CuSO4 in the solution.  

Moles of CuSO4 = 40.00 g / 159.62 g/mol = 0.2506 mol

Finally, we can use the equation molarity = moles / volume to find the molarity of the solution.

The volume of the solution is 200.0 mL, or 0.2000 L.

Molarity = 0.2506 mol / 0.2000 L = 1.253 M

Therefore, the molarity of the solution is 1.253 M.

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While the circular portion of this solar eclipse is not visible in Quito, a partial solar eclipse can be seen there.

A partial eclipse happens when the Sun and Moon are only partly blocked from Earth's view by the Moon. Typically, a sizable portion of the planet's surface outside of an annular or complete eclipse can observe this occurrence.

However, because the umbra travels above the polar areas of the Earth and never touches the Earth's surface, some eclipses can only be seen as partial eclipses. Since it requires well over 90% coverage to observe any dimming of the Sun's brightness, partial eclipses are essentially undetectable. It wouldn't be any dimmer than civil dusk even at 99%.

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Molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron(III) oxide (Fe2O3) and coke (pure carbon).

If 25.0 g of Fe2O3 are used, the number of atoms of iron that can be produced is determined using the balanced equation:

Fe2O3 + 3C → 2Fe + 3CO

Using the mole ratio from the equation, we know that for every 1 mole of Fe2O3 that is used, 2 moles of iron are produced.

We can then convert the 25.0 g of Fe2O3 to moles by using the molar mass of Fe2O3 (159.69 g/mol):

25.0 g Fe2O3 × (1 mol Fe2O3/ 159.69 g Fe2O3) = 0.1566 mol Fe2O3

And using the mole ratio, we can calculate the moles of iron produced:

0.1566 mol Fe2O3 × (2 mol Fe/ 1 mol Fe2O3) = 0.3132 mol Fe

Finally, we can convert the moles of iron produced to atoms of iron by using Avogadro's number (6.022 x 1023 atoms/mol):

0.3132 mol Fe × (6.022 x 1023 atoms Fe/ 1 mol Fe) = 1.878 x 1023 atoms Fe

Therefore, if 25.0 g of pure Fe2O3 are used, 1.878 x 1023 atoms of iron can be produced.

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Answer:

solid dispersed in gas

Fog is a type of colloid in which tiny droplets of liquid, such as water, are suspended in a gas, such as air. Fog can be considered a liquid-in-gas colloid since the dispersed-phase droplets are composed of liquid, and the continuous-phase is composed of gas.

Other examples of colloids include smoke (solid particles dispersed within a gas), whipped cream (gas in a liquid), mayonnaise (liquid in a liquid), gelatin (solid in a liquid), and clouds (liquid in a gas).

Fog can be categorized according to the type of gas which is the continuous phase. For instance, water-in-air fog is the most common type, while smoke of air constitutes a solid-in-air colloid. Other types of fog include oil-in-air (liquid-in-gas colloid) and dust-in-air (solid-in-gas colloid).

Colloids form when particles of the dispersed phase are typically larger than 1 nanometer, yet small enough to remain suspended in the continuous phase due to Brownian motion or other forces. The particles remain suspended due to the attraction of the particles for each other (Induced Charge Electrophoresis) and for the carrier phase molecules.

Understanding colloids is important for a variety of applications, such as drug delivery, material engineering, food science, and wastewater treatment

Fog is an example of a colloid that has the phase of "liquid dispersed in gas."

When air becomes saturated with water vapour and condenses into minute water droplets close to the Earth's surface, fog is a natural meteorological occurrence.

Fog is a foggy mist formed when little liquid water droplets are scattered across the atmosphere.

A colloidal system is produced when liquid water droplets are suspended in the gas phase (air).

Thus, because these droplets are so tiny, they can hang suspended in the air for a long time, giving fog its distinctive appearance.

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The correct answer is (D) A) 198°C B) 22770 J. Equilibrium can be achieved in reversible reactions, where the reactants can form products and vice versa.

What is Equilibrium?

Equilibrium is a state of balance or stability in a system. In thermodynamics, it refers to a state in which the temperature, pressure, and concentration of the components of a system do not change with time. At equilibrium, the forward and reverse reactions occur at equal rates, and the system does not undergo any net change.

To solve this problem, we can use the principle of conservation of energy, which states that the total energy of a closed system is conserved, meaning that energy cannot be created or destroyed, only transferred from one form to another.

We can start by using the formula for heat exchange:

Q = mcΔT

where Q is the heat exchange, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature.

For the aluminum chunk, we have:

Q_aluminum = (100.0 g) x (0.903 J/g°C) x (450.0°C - T_eq)

For the ethyl alcohol, we have:

Q_ethanol = (100.0 g) x (2.44 J/g°C) x (T_eq - 80.0°C)

At equilibrium, the heat exchange of the system is zero, so we can set Q_aluminum = -Q_ethanol and solve for T_eq:

(100.0 g) x (0.903 J/g°C) x (450.0°C - T_eq) = -(100.0 g) x (2.44 J/g°C) x (T_eq - 80.0°C)

Solving for T_eq, we get:

T_eq = 198.4°C (rounded to one decimal place)

This is the equilibrium temperature of the mixture.

Q_aluminum = (100.0 g) x (0.903 J/g°C) x (450.0°C - 198.4°C) = 22770 J (rounded to the nearest 10 J)

Q_ethanol = (100.0 g) x (2.44 J/g°C) x (198.4°C - 80.0°C) = 22770 J (rounded to the nearest 10 J)

So the total heat exchange of the system is:

Q_total = Q_aluminum + Q_ethanol = 2 x 22770 J = 45540 J (rounded to the nearest 10 J)

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If you had [tex]9.65 * 10^{26[/tex] atoms of Ag, you would have [tex]1.603 * 10^3[/tex] moles of Ag.

To find the number of moles of Ag atoms you have, you need to use Avogadro's number, which is 6.022 x 10^23. This number represents the number of atoms in one mole of any substance.
To find the number of moles, you need to divide the number of atoms you have by Avogadro's number:
Number of moles = Number of atoms / Avogadro's number
Plug in the given values:
Number of moles = 9.65 x 10^26 atoms / 6.022 x 10^23 atoms/mole
Simplify:
Number of moles = 1.603 x 10^3 moles
So, if you had 9.65 x 10^26 atoms of Ag, you would have 1.603 x 10^3 moles of Ag.

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The element with lowest electronegativity, based on periodic trends, is Li. An atom's electronegativity is measured.

Atomic radius, ionisation energy, electron attraction, electronegativity, valency, and metallic nature are important periodic trends. Due to the periodic nature of the elements and their similar electrical configurations within their various groups or periods, these tendencies are present.

The number of protons on the nucleus, the number of energetic levels, & the shielding effect are three variables that aid in the prediction of trends in the periodic table. In any group, the atomic radii get larger from top to bottom.

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Answer:

Copper has gained 2 electrons

Copper has been reduced

Explanation:

The oxidation state of Cu goes from 2+ to 0, meaning it gains 2 electrons (they each have -1 charge);

This is known as reduction

Pneumonic OILRIG:

Oxidation is Loss, Reduction is Gain

Oxidation is the loss of electrons

Reduction is the gain of electrons

Cu2+ gains 2 electrons, thus it is reduced

The percent yield of the reaction is 37.2%. The theoretical yield, or maximum amount of product that can be produced based on the amount of limiting reagent utilized in the reaction, must first be ascertained in order to calculate the percent yield.

In chemistry, the percentage yield is used to compare the actual outcome of a reaction to the maximum outcome anticipated.

Several institutions place a high value on yield because past yield data enables them to forecast the number of students they will need to accept to order to reach their enrollment goal. Fewer pupils may be admitted if the school's yield rates historically have been high.

We can use stoichiometry to calculate the theoretical yield of p-nitro-toluene:

1 mole of toluene produces 1 mole of p-nitro-toluene

The molar mass of toluene is 92.14 g/mol, and the molar mass of p-nitro-toluene is 137.14 g/mol.

550.0 g of toluene is equivalent to 5.97 moles (550.0 g / 92.14 g/mol).

Therefore, the theoretical yield of p-nitro-toluene is:

5.97 moles of p-nitro-toluene = 5.97 moles of toluene

5.97 moles of p-nitro-toluene x 137.14 g/mol = 819.9 g

we can calculate the percent yield:

Percent yield = (actual yield / theoretical yield) x 100%

In the given experiment, the actual yield of p-nitro-toluene is 305 g.

Percent yield = (305 g / 819.9 g) x 100% = 37.2%

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If you want a solution that is less than saturated, the amount of HCl needed is less - in this case, 27.5g.

Saturated refers to a state of being filled to capacity or having reached its maximum level. In chemistry, it is used to describe a molecule or compound that has all its available bonds filled with either single or multiple bonds. It is a state of maximum solubility, meaning that no more of a substance can dissolve in a given solvent. In physical science, it can also refer to the highest temperature where a substance can exist in the liquid state without boiling.

The amount of HCl required to make a solution with 100g of water saturated at 60 degrees C depends on the concentration of the HCl solution you are trying to make. If you want to make a saturated solution, the maximum amount of HCl that can be dissolved in 100g of water at 60 degrees C is 55g. If you want a solution that is less than saturated, the amount of HCl needed is less - in this case, 27.5g.

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Answer:

A. Some cities may be located at different altitude

C. Warm ocean currents bring warmer temperatures to coastal cities

D. Mountain ranges create the rain shadow effect

Explanation:

The climate in cities can differ due to several factors, including altitude, proximity to oceans or mountains, prevailing winds, and other geographical features. Thus, options A, C, and D are all correct. The type of people who live in a city, as stated in option B, is not a significant factor in determining climate.

The ground-state electron configuration of [tex]O^{2-}[/tex] is [He]2s²[tex]2p^{6}[/tex].[tex]2p^{6}[/tex]

The ground state is the state in which an atom is in its lowest energy state. The ground-state electron configuration of [tex]O^{2-}[/tex] is [He]2s²[tex]2p^{6}[/tex].

Oxygen anion, also known as oxide anion, is formed when oxygen gains two electrons to attain a negative charge. The electronic configuration of oxygen before gaining the two electrons is 1s²2s²[tex]2p^{4}[/tex].

When two electrons are added to oxygen, the resulting configuration becomes 1s²2s²[tex]2p^{6}[/tex]. However, to achieve a filled valence shell, the oxide ion has two additional electrons, resulting in a configuration of [He]2s²[tex]2p^{6}[/tex].

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Answer:

Filtration

Explanation:

Sand can be separated by filtration. Then, salt can be separated by evaporating the salt solution in water. Water can be recovered by condensation.

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Answer:

decantation and evaporation

Explanation:

Mass of rock = 5004.16kg. The mass of the elements present in the compound determines the percentage composition.

Given that the [tex]Fe_{2} O_{3}[/tex] is 80 % by mass.

It means that 80 kg of is present in 100 kg of rock

To find the mass of rock which contains 2800 kg of iron

2800 kg = 2800*1000 g

2 moles of iron are present in 1 mole of

Molar mass of iron = 55.845 g/mol

Mass of 2 moles = 55.845 * 2 = 111.69 g/mol

159.69 g/mol Molar mass of [tex]Fe_{2} O_{3}[/tex]

It implies,

In 159.69 g of iron, there are 111.69 g.

The amount of iron in 159.69/111.69 g of

There are 2800*1000 g in (159.69/111.69) *2800*1000 g of material.

Mass of [tex]Fe_{2} O_{3}[/tex] = 4003.33kg

Thus,

100 kg of rock contains 80 kg.

One kilogram of rock makes up 100/80 kg.

(100/80) *4003.33 kg of rock contains 4003.33 kg.

Mass of rock = 5004.16kg

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Answer:77.00 grams CO2

Explanation:

1.75 oles/1 mole  x 44 grams CO2= 77

(44 comes from the mass of 1 carbon and 2 oxygen)

Answer: 0.00135

Explanation:

The Avogadro's number is the number of particles (atoms, molecules, or ions) in one mole of a substance and is equal to 6.02 x 10^23. We can use this value to convert the number of molecules of CH4 into moles.

Number of molecules of CH4 = 8.11 x 10^20

Number of moles of CH4 = (8.11 x 10^20) / (6.02 x 10^23)

Number of moles of CH4 = 0.00135 moles of CH4 (rounded to five significant figures)

Therefore, there are approximately 0.00135 moles of CH4 in 8.11 x 10^20 molecules of CH4.

Answer and Explanation: 1 mole of a gas, at STP, occupies a volume of 22.4L. Hence, 10L will contain 10L / 22.4mol/L = 0.446mol of gas.

The pH of the resulting solution is 8.57. In terms of moles/liter, pH is the negative logarithm of the concentration of hydrogen ions. pH expresses the nature of the solution (acidic, alkaline or neutral).

Number of HCN moles equals molarity * volume in L.

                                 = 0.337(0.15) = 0.05055 moles

Number of NaCN moles = molarity * volume in L.

                                   = 0.344(0.15)   =0.0516 moles

HCN's Pka is 9.31.

PH   = Pka + log [NaCN]/[HCN]

        = 9.31 + log0.0516/0.05055

        = 9.31 + 0.00893    = 9.319

After adding 0.0359 moles of HCL, the number of moles of HCN is equal to 0.05055 + 0.0359, = 0.08645 moles.

After adding 0.0359 moles of HCl, the number of moles of NaCN is equal to 0.0516-0.0359 moles, = 0.0157 moles.

PH = PKa + log [NaCN]/[HCN] = 9.31 + log [0.0157/0.08645] = 9.31 -0.74086 = 8.57

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Answer:

clarify

Explanation:

The molarity of NaOH when 39.99 g NaOH was dissolved in 0.2 L of water is 5 M.

Molarity is a measure of the concentration of a solute in a solution, defined as the number of moles of the solute per liter of the solution. A mole is the amount of a substance that contains the same number of entities as there are atoms in 12 grams of carbon-12.

For example, if you dissolve one mole of a solute in one liter of a solution, you have a one-molar solution (1 M).

The formula for molarity is, Molarity (M) = Moles of solute / Volume of solution (in liters)

The number of moles of NaOH in 1 L of water is calculated as follows:

Weight of NaOH = 39.99 g

The molar mass of NaOH = 39.99 g/mol (As said that 39.99 g of NaOH makes 1 molar solution)

The number of moles of NaOH = weight / molar mass = 39.99/39.99 = 1 mol

Molarity = the number of moles/volume of solution in liters

Molarity = 1mol / 1 L = 1 M

If 39.99 g of NaOH is dissolved in 0.2 L of water, we can calculate the molarity as follows:

Weight of NaOH = 39.99 g

The molar mass of NaOH = 39.99 g/mol

The number of moles of NaOH = weight / molar mass = 39.99/39.99 = 1.0 mol

Molarity = the number of moles/volume of solution in liters

Molarity = 1 mol / 0.2 L = 5 M

Therefore, the molarity of NaOH is 5 M.

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The two properties are used to identify clouds are atmospheric height and how they look like.

Often, factors like a cloud's height in the skies, texture, and the kind of "weather" it produces or doesn't generate are used to classify and identify it.

Thus, the two properties are used to identify clouds are atmospheric height and how they look like.

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The molar mass of barium phosphate to calculate the mass of barium phosphate produced is 48.26 g of Ba₃(PO₄)₂.

Molar mass is a term used in chemistry to refer to the mass of a single molecule of a substance. It is calculated by multiplying the atomic mass of each element in the molecule by the number of atoms in the molecule and then adding up the results.

Balancing the equation:
Ba + 3Cu + 4PO₄ -> Ba₃(PO₄)₂ + 3Cu
Since 5.84 g of barium is given, we can use the mole ratio between barium and barium phosphate to calculate the number of moles of barium phosphate produced.
Molar mass of barium = 137.33 g/mol
Molar mass of barium phosphate = 377.3 g/mol
5.84 g of barium = 5.84 g / 137.33 g/mol = 0.0427 mol of barium
Using the mole ratio of 1 mol Ba : 3 mol Ba₃(PO₄)₂, we can calculate the amount of barium phosphate produced:
0.0427 mol of Ba * (3 mol Ba₃(PO₄)₂ / 1 mol Ba) = 0.1281 mol of Ba₃(PO₄)₂
Finally, we can use the molar mass of barium phosphate to calculate the mass of barium phosphate produced:
0.1281 mol of Ba₃(PO₄)₂ * 377.3 g/mol = 48.26 g of Ba₃(PO₄)₂.

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