Calculate the ionic strength of 0.00025 M La(IO3)3. Assume complete dissociation at this low concentration and no hydrolysis reaction to form LaOH2+.


The answers i got were 0.0012 and 0.003, both are incorrect. Please help!

Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid [tex]O_2[/tex] -183°C.

To solve this problem, we need to consider the ideal gas law and the molar volume of gases.

First, we can calculate the number of moles of oxygen in 150 L of liquid [tex]O_2[/tex] at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:

Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g

Molar mass of oxygen (O2) = 32 g/mol

Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol

Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:

Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol

Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:

PV = nRT

P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm

V = volume of dry air (unknown)

n = 25.43 mol

R = 0.0821 L·atm/(mol·K)

T = 25°C + 273.15 = 298.15 K

Solving for V:

V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L

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The volume of the gas from the calculation that we have done to solve the question that is given here is 2.1 L

Number of moles of the magnesium = 2 g/24 g/mol

= 0.083 moles

If 1 mole of Mg produces 1 mole of hydrogen

0.083 moles of Mg would produce 0.083 moles of hydrogen

Then under the given conditions

T =  24.5 °C or 297.5 K

V = ?

n = 0.083 moles

R = 0.082 atmLK-1mol-1

P = 29.69 inches Hg or 754 torr - 23.1 torr

= 730.9 torr or 0.96atm

V = nRT/P

V = 0.083 * 0.082 *  297.5 / 0.96

V = 2.1 L

The volume would be 2.1 L

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Explanation:

It is the emission of electron from a metal under the effect of light is known as photo electric effect

I hope this imformation help full for you

The next step Meg should take in applying the scientific method to discover the reasons for the hot pavement is B. Ask questions. Option B

Asking questions is a crucial step in the scientific method because it allows for the formulation of a hypothesis and the design of experiments to test that hypothesis. By asking questions, Meg can begin to explore the possible factors contributing to the hot pavement and formulate hypotheses to explain the phenomenon.

In this case, Meg can ask questions such as:

Why is the pavement so hot?

Does the pavement always feel hot after swimming?

Is the temperature of the pavement affected by the weather conditions?

Are there specific materials or colors used in the pavement that may contribute to its heat absorption?

These questions will help guide Meg in her investigation and provide a starting point for gathering more information and designing experiments to test her hypotheses.

Once Meg has formulated her questions, she can move on to the next steps of the scientific method, which include making observations, analyzing data, conducting experiments, and communicating the results.

These subsequent steps will allow her to gather data, analyze it, and draw conclusions based on evidence, leading to a better understanding of the factors contributing to the hot pavement. Meg can then communicate her findings to others, furthering scientific knowledge and potentially finding solutions to mitigate the problem.

Option B

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The necessary volume of H₂ gas to obtain 5.0 g of propane (C₃H₈) is approximately 12.60 liters.

To determine the necessary volume of H₂ gas to obtain 5.0 g of propane (C₃H₈), we need to use the molar ratio between H₂ and C₃H₈, as well as the density of H₂ gas.

First, let's calculate the molar mass of propane (C₃H₈):

C: 12.01 g/mol

H: 1.01 g/mol

Molar mass of C₃H₈ = (3 * C) + (8 * H) = (3 * 12.01) + (8 * 1.01) = 44.11 g/mol

Next, we can determine the number of moles of propane (C₃H₈) using its mass:

Number of moles = Mass / Molar mass

Number of moles of C₃H₈ = 5.0 g / 44.11 g/mol ≈ 0.1134 mol

Now, we can establish the molar ratio between H₂ and C₃H₈ from the balanced chemical equation:

C₃H₈ + 5H₂ → 3CH₄

According to the balanced equation, 5 moles of H₂ are required to produce 1 mole of C₃H₈.

Therefore, the number of moles of H₂ required can be calculated as:

Number of moles of H₂ = 5 * Number of moles of C₃H₈ = 5 * 0.1134 mol = 0.567 mol

Finally, we can determine the necessary volume of H₂ gas using the ideal gas law equation:

Volume = (Number of moles * Gas constant * Temperature) / Pressure

Given that the density of H₂ is 0.09 g/L, we can convert it to moles per liter:

Density = Mass / Volume

0.09 g/L = 2 g/mol / Volume (since the molar mass of H₂ is 2 g/mol)

Solving for Volume:

Volume = 2 g/mol / 0.09 g/L ≈ 22.22 L/mol

Now, we can calculate the necessary volume of H₂ gas:

Volume of H₂ = Number of moles of H₂ * Volume per mole

Volume of H₂ = 0.567 mol * 22.22 L/mol ≈ 12.60 L

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Some types of solids that are insoluble in water are:

Many solids are insoluble in water, meaning they do not dissolve in water to a significant extent. Here are some examples of common solids that are generally insoluble in water:

Metals: Most metals, such as gold, silver, platinum, and copper, are insoluble in water.

Non-Metallic Elements: Many non-metallic elements, such as carbon (in the form of graphite or diamond), sulfur, phosphorus, and iodine, are insoluble in water.

Metal Oxides: Some metal oxides, particularly those of less reactive metals, are insoluble in water. Examples include aluminum oxide (Al2O3), iron(III) oxide (Fe2O3), and lead(II) oxide (PbO).

Metal Carbonates: Most metal carbonates are insoluble in water. Examples include calcium carbonate (CaCO3), lead(II) carbonate (PbCO3), and copper(II) carbonate (CuCO3).

Metal Sulfides: Many metal sulfides are insoluble in water. Examples include lead(II) sulfide (PbS), silver sulfide (Ag2S), and mercury(II) sulfide (HgS).

Insoluble Salts: Certain salts have limited solubility in water. Examples include silver chloride (AgCl), lead(II) iodide (PbI2), and calcium sulfate (CaSO4).

It's important to note that while these solids are generally insoluble in water, they may exhibit some solubility to a small extent. The solubility of a solid in water can vary depending on factors such as temperature, pressure, and the presence of other solutes.

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The following are the answers to the given molecules:

a. PCl5:

Lewis structure:

   Cl

    |

Cl-P-Cl

    |

   Cl

(1) Molecular geometry: Trigonal bipyramidal

(2) Shape: Trigonal bipyramidal

(3) Polar or non-polar: Non-polar

(4) Hybridization of the central atom: sp3d

b. SF6:

Lewis structure:

 F    F

  \  /

   S

  /  \

 F    F

(1) Molecular geometry: Octahedral

(2) Shape: Octahedral

(3) Polar or non-polar: Non-polar

(4) Hybridization of the central atom: sp3d2

c. XeF4:

Lewis structure:

F    F

 \  /

  Xe

 /  \

F    F

(1) Molecular geometry: Square planar

(2) Shape: Square planar

(3) Polar or non-polar: Non-polar

(4) Hybridization of the central atom: sp3d2

d. CH2Cl2:

Lewis structure:

 H    H

  \   /

    C

  /   \

 Cl   H

(1) Molecular geometry: Tetrahedral

(2) Shape: Tetrahedral

(3) Polar or non-polar: Polar

(4) Hybridization of the central atom: sp3

e. PO43-:

Lewis structure:

   O

  //

 O   O

  \    /

    P

    |

   O

(1) Molecular geometry: Tetrahedral

(2) Shape: Tetrahedral

(3) Polar or non-polar: Non-polar

(4) Hybridization of the central atom: sp3

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The source of energy in nuclear power plants is optionD. Fission.

The source of energy in nuclear power plants is nuclear fission. Nuclear fission is the process in which the nucleus of an atom, typically a heavy element like uranium or plutonium, is split into two smaller nuclei, releasing a significant amount of energy in the process. This energy is harnessed to generate heat, which is then used to produce steam and drive turbines connected to generators, ultimately generating electricity.

In a nuclear power plant, controlled fission reactions occur in the reactor core, where nuclear fuel, such as uranium-235 or plutonium-239, is used as the fuel source. When these fuel nuclei undergo fission, they release high amounts of energy in the form of heat and also emit additional neutrons, which can sustain a chain reaction if properly controlled.

It's important to note that fusion (option A) is the process of combining two light atomic nuclei to form a heavier nucleus, which also releases a substantial amount of energy. However, fusion reactions have not yet been fully developed for practical energy generation in power plants.

Alpha decay (option B) is a type of radioactive decay where an atomic nucleus emits an alpha particle. Combustion (option C) refers to the process of burning a fuel in the presence of oxygen, which is not the mechanism utilized in nuclear power plants.The correct answer is d.

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The partial pressure of nitrogen on Venus is approximately 321.914 kPa.

To find the partial pressure of nitrogen on Venus, we need to calculate the partial pressure using the mole fraction of nitrogen and the total atmospheric pressure. First, we convert the total atmospheric pressure from psi to kilopascals (kPa) since the mole fraction is given in terms of kPa.

1 psi = 6.89476 kPa

Therefore, the total atmospheric pressure on Venus is:

1334 psi × 6.89476 kPa/psi = 9197.53 kPa

Next, we can calculate the partial pressure of nitrogen using the mole fraction. The mole fraction of nitrogen is given as 0.035, which means that nitrogen makes up 3.5% of the total moles of gas in the atmosphere.

The partial pressure of nitrogen is given by:

Partial pressure of nitrogen = Mole fraction of nitrogen × Total atmospheric pressure

Partial pressure of nitrogen = 0.035 × 9197.53 kPa

Partial pressure of nitrogen = 321.914 kPa

Therefore, the partial pressure of nitrogen on Venus is approximately 321.914 kPa.

It's important to note that the given atmospheric composition of Venus's atmosphere and the total atmospheric pressure are approximate values and can vary depending on specific conditions and measurements.

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The combined Gas Law equation is represented by B) P1V1 / T1 = P2V2 / T2.

The combined gas law is the law that combines Charles’s law, Gay-Lussac’s law, and Boyle’s law.

Combined gas law can be mathematically expressed as

k = PV/T

Where,

P = pressure

T = temperature in kelvin

V = volume

K  = constant (units of energy divided by temperature)

When two substances are compared in two different conditions, the law can be stated as,

P1V1/T1 = P2V2/T2

Where,

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = final pressure

V2= final volume

T2 = final temperature

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A wave is a recurring, periodic disturbance that moves from one place to another via a medium (like water).

A wave is a disturbance that moves or propagates away from its source. Although waves can move energy between locations, they do not always move mass. Common examples of waves are light, sound, and ocean waves.

Mobile phones and radar systems are two noteworthy examples of wave applications. Even though radio waves are usually thought to be safe and contribute to background radiation, it is still advised to keep your distance from radio wave sources.

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complete question;

Using your outline and the materials you’ve gathered, write a 250- to 500-word paper using word processing software. Be sure to proofread and revise your writing to catch any errors in grammar, spelling, logic, or organization. Add a works cited page at the end to give credit to your sources. Submit your completed paper and this activity to your teacher for evaluation. This is for Unit Activity: Waves in edmentum