Calculate the pH of 0. 10 M solution of hypochlorous acid, HOCl, Ka = 2. 9 x 10-8

The mass percent (m/m) of the solution prepared by dissolving 51.76 g of NaCl in 170.9 g of H2O is 23.25%.

To calculate the mass percent (m/m) of a solution, you need to divide the mass of the solute (NaCl) by the total mass of the solution (NaCl + H2O) and multiply by 100.
The mass of NaCl is given as 51.76 g, and the mass of H2O is given as 170.9 g.
To find the total mass of the solution, you simply add the masses of NaCl and H2O together: 51.76 g + 170.9 g = 222.66 g.
Next, divide the mass of NaCl by the total mass of the solution: (51.76 g / 222.66 g) * 100 = 23.25%.

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Answer:

it's volume also decrease

The radius of the aluminum sphere that will balance a solid iron sphere of radius 2.34 cm on an equal-arm balance is approximately 0.033 cm.

Given that,One cubic meter (1,00 m³) of aluminum has a mass of 2.70×10³ kg, and the same volume of iron has a mass of 7.86×10³ kg.

The radius of a solid aluminum sphere that will balance a solid iron sphere of radius 2.34 cm on an equal-arm balance is to be determined.

Since, the density of the aluminum is given by,

ρ = m/Vwhere,

m = mass of the aluminum

= 2.70 × 10³ kg

V = volume of the aluminum

= 1.00 m³

∴ ρ = 2.70 × 10³/1.00ρ

= 2700 kg/m³

The density of the iron is given by,

ρ = m/Vwhere,

m = mass of the iron = 7.86 × 10³ kg

V = volume of the iron = 1.00 m³

∴ ρ = 7.86 × 10³/1.00ρ = 7860 kg/m³

Let r be the radius of the aluminum sphere. The volume of the sphere is given by,V = 4/3πr³

The mass of the sphere is given by,

m = ρV

= ρ (4/3πr³)

= (4/3)πρr³

Hence, the mass of the aluminum sphere is given by,m1 = (4/3)πρ1r13

and the mass of the iron sphere is given by,m2 = (4/3)πρ2r23

Given that the radius of the iron sphere is 2.34 cm.

∴ r2 = 2.34/100 = 0.0234 m

Given that the two spheres balance each other.

Hence the mass of the aluminum sphere and the mass of the iron sphere are equal.

∴ m1 = m2

⇒ (4/3)πρ1r13 = (4/3)πρ2r23

⇒ ρ1r13 = ρ2r23

⇒ r13/r23 = ρ2/ρ1

⇒ (r1/r2)³ = ρ2/ρ1

⇒ r1/r2 = (ρ2/ρ1)^(1/3)

⇒ r1 = r2(ρ2/ρ1)^(1/3) = 0.0234(7860/2700)^(1/3)

≈ 0.033 cm (rounded to three decimal places)

Therefore, the radius of the aluminum sphere that will balance a solid iron sphere of radius 2.34 cm on an equal-arm balance is approximately 0.033 cm.

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The compound with the most fluorine atoms is carbon tetrafluoride (CF4), with 4 fluorine atoms per molecule.

The number of fluorine atoms in each of the given compounds can be determined by looking at their chemical formulas.

- Carbon tetrafluoride (CF4) contains 4 fluorine atoms per molecule.

- Fluorine gas (F2) contains 2 fluorine atoms per molecule.

- Sodium fluoride (NaF) contains 1 fluorine atom per molecule, so 2 moles of NaF would contain 2 fluorine atoms.

- Iron(II) fluoride (FeF2) contains 2 fluorine atoms per molecule.

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The molar concentration of a 12% sodium chloride solution is approximately 2.05 M.

To determine the molar concentration of a 12% sodium chloride solution, we need to convert the given percentage concentration into molarity.

First, we need to understand that the percentage concentration refers to the mass of the solute (sodium chloride) relative to the total mass of the solution.

In this case, a 12% sodium chloride solution means that there are 12 grams of sodium chloride in 100 grams of the solution.

To convert this into molar concentration, we need to consider the molar mass of sodium chloride, which is 58.5 g/mol.

We can start by calculating the number of moles of sodium chloride in 12 grams:

Moles of sodium chloride = mass of sodium chloride / molar mass of sodium chloride

Moles of sodium chloride = 12 g / 58.5 g/mol = 0.205 moles

Next, we calculate the volume of the solution in liters using the density of the solution. Since the density is not provided, we assume a density of 1 g/mL for simplicity:

Volume of solution = mass of solution / density

Volume of solution = 100 g / 1 g/mL = 100 mL = 0.1 L

Finally, we calculate the molar concentration (Molarity) by dividing the number of moles by the volume in liters:

Molar concentration = moles of solute / volume of solution

Molar concentration = 0.205 moles / 0.1 L = 2.05 M

Therefore, the molar concentration of a 12% sodium chloride solution is approximately 2.05 M.


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The energy of a photon that has a frequency of 2.3 x 10¹⁴ Hz is 1.524 × 10-¹⁹J

HOW TO CALCULATE ENERGY OF A PHOTON:

E = hf

Where;

E = energy of photon (J)

h = Planck's constant (6.626 × 10-³⁴J)

f = frequency of photon (Hz)

E = 6.626 × 10-³⁴ × 2.3 × 10¹⁴

E = 15.24 × 10-³⁴+¹⁴

E = 15.24 × 10-²⁰J

E = 1.524 × 10-¹⁹J

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The three states of matter are solid - example is stone, liquid - example is water and gas - example is air.

A matter is referred to as a substance which has a certain mass and takes up a certain volume in space.

For example pen, pencil, toothbrush, water, milk are matters as well as car, bus, bicycle is also a matter. So matter is considered as a living thing and a non-living thing.

There are three states of matter and they include;

They have different properties, which can be explained by looking at the arrangement of their particles. This is the theoretical temperature at which particles have the least amount of energy and the slowest movement.

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Answer:

the answer is A, they are measured in kilograms

Answer:

From Pressure Law

P1/T1 = P2/T2

Changing our temp to kelvin

T1 = 47 +273 = 320K

We're looking for T2

Making T2 the subject

T2 =P2 x T1 / P1

= 655 x 320/850

T2 = 246K

Answer:Atomic radius gets bigger

Explanation:

Atomic radius bigger because not only do the atoms have more and more protons and neutrons, and thus more mass in general, there is also stronger shielding affect. Shielding affect is when electrons closer to the nucleus block the positive charge from reaching electrons farther from the nucleus, and thus those far electrons are not drawn towards the nucleus as strongly, and spread out more, increasing atomic radius.

These are just a few examples of energy transformations associated with different processes. Energy transformations occur in various forms throughout nature and technology, and understanding them is crucial for studying energy systems and their impacts on the environment and society.

Here are some common energy transformations and their associated processes:

Combustion:

Process: Burning of fossil fuels such as coal, oil, or natural gas.

Energy Transformation: Chemical energy in the fuel is converted into thermal energy (heat) and light energy.

Photosynthesis:

Process: Occurs in plants, where they convert sunlight, carbon dioxide, and water into glucose (chemical energy) and oxygen.

Energy Transformation: chemical energy is transformed into chemical energy stored in glucose.

Cellular Respiration:

Process: Takes place in cells, breaking down glucose and other organic molecules to release energy.

Energy Transformation: Chemical energy stored in glucose is converted into ATP (adenosine triphosphate), which is a form of usable energy for cells.

Electric Power Generation:

Process: Power plants use various methods (such as coal, nuclear reactions, or renewable sources like wind or hydro) to generate electricity.

Energy Transformation: The energy source (e.g., fossil fuels, nuclear reactions, or renewable sources) is converted into electrical energy.

Solar Panels:

Process: Solar panels capture sunlight using photovoltaic cells and convert it into electricity.

Energy Transformation: Solar energy is transformed into electrical energy.

Nuclear Fission:

Process: In nuclear power plants, the process of splitting atoms (fission) is used to release a tremendous amount of energy.

Energy Transformation: Nuclear potential energy is converted into thermal energy, which is then used to generate electricity.

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Answer:

LITHIUM-ION.

Explanation:

ATOMIC STRUCTURE -

The smallest unit has the characteristics property of an element.

An atom consists of electron revolving around the nucleus in fixed orbits.

The Nucleus is a centrally located mass formed by the protons and the neutrons.

The atomic mass of an element is given as the sum of the protons and neutrons.

The Atomic number is equal to the number of protons or electrons.

In the given element element,

Atomic mass = 3 + 4 = 7

Atomic number = 3

As the number of protons in the atom is greater than the number of electrons by 1. Therefore, the element is a cation.

The element with atomic number 3 and atomic mas 7 is LITHIUM-ION.

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During the burning of wood, the breaking of carbon bonds in wood releases heat energy as shown in the model below:

A model is a representation of a process or structure.

The model that will show how the chemical potential energy of wood and how that energy is transformed can be designed as follows:

Let chemical equations represent the model.

The main chemical storing chemical energy in wood is carbon which is responsible for the release of heat energy.

The carbon atoms are linked together in straight chains. The breaking of the chains release heat energy.

Inconclusion, the breaking of chemical bonds in wood releases heat energy during the combustion of wood.

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Your answer: (a) Yes, regardless of the sign of ΔH, if ΔS is positive, a reaction can be rendered favorable by increasing the temperature.

A property whose value doesn't depend on the path taken to reach that specific value is known to as state functions or point functions. In contrast, those functions which do depend on the path from two points are known as pathThe fundamental thermodynamic equations follow from five primary thermodynamic definitions and describe internal energy, enthalpy, Helmholtz energy, and Gibbs energy in terms of their natural variables.

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Answer: 3.83

Explanation:

Answer:

3.83 :)

Explanation:

:)

zinc is more reactive than hydrogen it displaces hydrogen in dilute hydrochloric acid.

Life cannot exist without the chemical element zinc (Zn), which belongs to Group 12 (IIb, or the zinc group) of the periodic table and is one of the most widely utilized metals. Zinc has a significant commercial significance.

Average zinc content per ton in the Earth's crust is 65 grams (2.3 ounces), which is somewhat greater than copper. The primary zinc mineral, sphalerite, as well as its oxidation products, smithsonite and hemimorphite, make up almost all of the world's zinc ore. Native zinc deposits have reportedly been discovered in Australia, New Zealand, and the US. The main producers of zinc at the start of the twenty-first century are China, Australia, and Peru.

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The correct option is B. The feature that makes carbohydrates and fats power assets is each have lots of bonds with loosely held electrons.

A bond refers back to the pressure that holds two or greater atoms collectively to shape a molecule or compound. Bonds are fashioned when atoms proportion or alternate electrons to gain a greater solid configuration. The electricity of a bond relies upon at the electronegativity of the atoms concerned, their distance from each other, and the wide variety of electrons they proportion or trade.

The most commonplace sorts of bonds are covalent, ionic, and metallic. In covalent bonds, atoms share electrons to complete their outermost electron shells. Ionic bonds occur whilst one atom donates an electron to every other atom to form definitely and negatively charged ions, that are then interested in every different. metal bonds arise between atoms of metals, wherein the outermost electrons are unfastened to move for the duration of the steel lattice.

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Automobile batteries contain Sulfuric acid.

A battery is a device that converts chemical energy which is present within its  materials directly into electric energy through the electrochemical oxidation-reduction or a redox reaction. This type of reaction involves the transfer of electrons from one material to another through an electric circuit.

An automobile battery is an example of a wet cell battery, with six cells. Each cell of the lead storage battery consists of alternate plates made of a lead alloy grid filled with sponge lead which is the cathode plates or  it is coated with lead dioxide which is the anode.  Each cell is filled with a sulfuric acid solution, which acts as the  electrolyte.

Car batteries acids consist of 30% to 50% sulphuric acid in water with a mole fraction of 29% sulphuric acid. Density of the acid is about 1.25 kilograms per liter, and pH level is about 0.8.

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Answer:

Malaria

Explanation:

Mosquitos mainly carry Malaria since the dawn of men.

Answer:

malaria

Explanation:

"Malaria" is a mosquito-borne illness that is caused by a parasitic protist called "Plasmodium protozoa." These parasites are carried by mosquitoes. Once a mosquito bites a human, it creates an opening for the parasites to enter. The parasites then become harmful once they enter the human body. They infect the human's Red Blood Cells (RBCs), which causes several symptoms such as fever, fatigue, headache, cough, nausea, etc.

The concentration of salt in the tank when water starts to overflow is 12 grams per gallon.

To find the concentration of salt in the tank when water starts to overflow, we need to determine the amount of salt in the tank at that point and divide it by the total volume of water.

First, let's calculate the amount of salt that flows into the tank per minute:
8 grams of salt per gallon * 3 gallons per minute = 24 grams of salt per minute.

Next, let's calculate the amount of water that flows out of the tank per minute:
2 gallons per minute.

The net change in the volume of water in the tank per minute is:
3 gallons per minute - 2 gallons per minute = 1 gallon per minute.

Since the initial volume of water in the tank is 50 gallons and the net change in volume is 1 gallon per minute, the time it takes for the water to overflow is:
(100 gallons - 50 gallons) / 1 gallon per minute = 50 minutes.

Therefore, after 50 minutes, the tank will overflow.

To find the concentration of salt in the tank at that point, we need to calculate the total amount of salt in the tank after 50 minutes:
24 grams per minute * 50 minutes = 1200 grams.

The total volume of water in the tank is 100 gallons, and since the tank overflows after 50 minutes, the amount of water in the tank is 100 gallons.

Therefore, the concentration of salt in the tank when water starts to overflow is:
1200 grams / 100 gallons = 12 grams per gallon.

So, the concentration of salt in the tank when water starts to overflow is 12 grams per gallon.

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The coffee's pH will be 10.

What does pH refer to?

because hydrogen ions attach to water molecules for form hydronium ions.

To calculate the pH of a solution, use the equation

pH = − log [H3O+]

Since we are given the hydronium ion (H3O+) concentration of the solution, we can plug this value into the formula.

pH = −log[ 1.00 × 10^−10M]

pH = 10

Hence, The pH of this solution is 10

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Measuring tool would you use to measure the area of a football field is used a tender wheel

If you need to measure much longer lengths for example the length of a football pitch then you could use a trundle wheel then you use it by pushing the wheel along the ground and it clicks every time it measures one meter and to measure the football field area then

Area = length×breadth

Area = 90m×45m

Area = 4.05m²

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Answer:

moles or atoms?

Explanation:

you can't have a molecule of any so there's two different answers that I can give you:

how many moles? 1.5

how many atoms? 9.03x10^23 atoms

At STP 1 mole of an ideal gas occupies 22.4L.

33.6 L x 1 mol/22.4 L = 1.5 moles of Neon

1.5 moles Ne x 6.02x1023 atoms/mole = 9.03x1023 atoms

9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP. At STP 1 mole of an ideal gas occupies 22.4L.

The smallest unit of matter that may be split without producing electrically charged particles is the atom. It is also the smallest piece of substance with chemical element-like characteristics. Electric forces, which link electrons towards the nucleus of atoms, cause them to be drawn to any positive charge.

Space makes up the majority of an atom. The remainder is made up of a cloud of negatively charged electrons around a positively charged nucleus made up of protons and neutrons. Compared to electrons, that are the smallest charged particles in nature, the nucleus is tiny and dense.  

At STP 1 mole of an ideal gas occupies 22.4L.

33.6 L x 1 mol/22.4 L = 1.5 moles of Neon

1.5 moles Ne x 6.02x10²³ atoms/mole = 9.03x10²³ atoms

Therefore, 9.03x10²³ molecules are in 33.6 liters of neon (Ne) gas at STP.

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If we assume that the melting points and TLC are in agreement, then we can use them to determine the purity of the solids.

The purest solid would have the highest melting point and the most distinct TLC spot. We can compare the values to ascertain which solid is the purest if the melting points and TLC are in agreement. It may be a sign that the extraction was unsuccessful or that there were impurities in the sample if there is a significant difference between the melting points or the spots on the TLC.

It's crucial to remember that melting points and TLC are not always accurate indications of purity because other variables can influence them. However, they can be a helpful tool for determining the success of an extraction experiment if the values are consistent and in agreement.

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The mass percent of glycerol in the solution is approximately 2.55%.

Explanation:

The mass percent of glycerol in the solution can be calculated as shown below:

First, the mass of the solution can be calculated using the following formula:

Mass of the solution = Density of the solution x Volume of the solution

The volume of the solution is not given, so let us assume a volume of 1 liter (1000 ml) of the solution, which is a common assumption.

Therefore, Mass of the solution = 1.1663 g/ml x 1000 ml= 1166.3 g

Next, the mass of glycerol in the solution can be calculated using the mole fraction and molecular weight of glycerol. The molecular weight of glycerol (C3H8O3) can be calculated as follows:

Molecular weight of glycerol (mm of C3H8O3) = 3 x atomic weight of C + 8 x atomic weight of H + 3 x Atomic weight of O= 3(12.01) + 8(1.008) + 3(16.00) = 92.09 g/mol

Now, the mass of glycerol in the solution can be calculated using the following formula:

Mass of glycerol = Mole fraction of glycerol x Mass of the solution x Molecular weight of glycerol Mass of glycerol = 0.258 x 1166.3 g x 92.09 g/mol= 29.70 g

Finally, the mass percent of glycerol in the solution can be calculated using the following formula:

Mass percent of glycerol = Mass of glycerol / Mass of the solution x 100%Mass percent of glycerol = 29.70 g / 1166.3 g x 100%≈ 2.55%

Therefore, the mass percent of glycerol in the solution is approximately 2.55%.

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Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

mass = 10 × 25

We have the final answer as

Hope this helps you