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Can someone explain the step?

Calculate the mass (in grams) needed to prepare 0.505 liters of a 0.314 M CH,;O, solution.
You do not need to enter a unit with your answer.

The amount of heat required to vaporize 181.20 g of ethanol would be 170.1 kJ.

Using the formula:

Q = n ∆Hvap

where:

Moles of 181.20 g of ethanol = 181.20 g / 46.07 g/mol = 3.933 mol

Substituting the values:

Q = 3.933 mol x 43.3 kJ/mol = 170.1 kJ

In other words, the amount of heat required to vaporize 181.20 g of ethanol is 170.1 kJ.

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Answer: Because Kinetic energy depends on temperature and not mass

Explanation:

Average kinetic energy is defined as the average of the kinetic energies of all the particles present in a system. It is determined by the equation:

\(K.E=\frac{3RT}{2}\)

where K.E = Kinetic energy

R= gas constant

T= temperature in kelvin

It is visible that kinetic energy is dependent on the temperature of the system and not on the mass of the system. Thus particles with different masses have the same kinetic energy when at the same temperature

The states of matter are solid, liquid, gas, and plasma.

Addition of heat to a substance helps the molecules break the intermolecular forces of attraction.

Elements are pure substances consisting of same type of atoms while Compounds are pure substances consisting of two or more different atoms.

The states of matter are four types namely:

Addition of heat to a substance results in phase change as the heat added to the substance helps the molecules break the intermolecular forces of attraction.

Elements are pure substances consisting of entirely the same type of atoms, for example hydrogen.

Compounds are pure substances consisting of two or more different atoms, for example water.

A pure (hom0genous) substance consists of one more elements chemically joined together while mixtures consists of two or more substances physically joined together.

Physical changes are changes that can be easily reversed such as the melting of candle wax while chemical changes are changes that cannot be easily reversed such as rusting of iron.

The modern atomic theory is the theory that atoms consists of the three fundamental particles; electrons, protons and neutrons.

Democritus stated that all matter consists of atoms which are extremely small and indestructible.

Dalton stated that all elements consists of small indivisible particles called atoms and that atoms of the same element were alike in all respects.

Atoms consists of electrons which are found in energy levels or orbits around the nucleus where the protons and neutrons are found.

Isotopes are atoms of the same element having different masses.

Atomic number of an element is the number of protons in the atom while the mass number is the sum of protons and neutrons in the atom.

The period table of elements is arranged in increasing order of atomic number of elements into groups and periods.

In conclusion, matter is the main component of materials and it exists in four different states.

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Roll up the flowy sleeves, loose bracelets, long necklaces, long earrings should be removed or tucked under clothing. Tie the long hairs.

The best way to deal is,

Flowy sleeves: Roll up or tuck in the sleeves to prevent them from interfering with lab equipment.

Loose bracelets: Remove the bracelets or tuck them under gloves.

Long necklaces: Remove the necklaces or tuck them under clothing to prevent them from getting caught on equipment.

Long earrings: Remove the earrings or tuck them under clothing.

Long hair: Tie hair back or wear a hairnet to prevent hair from getting caught on equipment.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Thus, the total pressure is 0.184 atm.

What is Pressure?

The amount of pressure exerted (thrust) on a floor in line with unit place is described as ‘pressure’. It can also be defined as the ratio of the force to the place (over which the pressure is performing).

The force applied perpendicular to the surface of an object in step with unit vicinity over which that force is sent.

PV=nRT is the ideal gas equation.

Where P denotes pressure, V denotes volume, n is the number of moles, R denotes the gas constant, and T denotes temperature.

As a result, the temperature of the  sample will only be doubled, with the same volume and number of moles. Because temperature and pressure are inextricably linked, if one rises, the other must rise as well, resulting in a pressure of 0.092 atm.

The following are the steps in the breakdown process: Decomposition reaction:  ⇄  +

As a result, 1 mole of   produces 2 moles of products (1 of each), and n doubles. The pressure will double to 0.184 atm since the volume and temperature are now constants, and the pressure is directly proportional to the number of moles.

Thus, the total pressure is 0.184 atm.

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The volume of \(N_2O_5\) needed to produce 9.64 L of \(NO_2\) is 4.97 L, calculated using stoichiometry and the ideal gas equation.

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Answer: Decomposition

Explanation:

The compound, (Aluminum Oxide), decomposes to form Aluminum and Oxygen.

The mass of Na₃PO₄ formed during the reaction is 328 g.

The balanced chemical equation for the reaction is:

\(3NaOH + Na_3PO_4 - > 3Na_2PO_4 + H_2O\)

From the equation, we can see that 3 moles of NaOH produce 1 mole of Na₃PO₄.

Given that 2.0 moles of Na₃PO₄ is produced, we can set up a proportion to find the amount of NaOH required:

3 mol NaOH / 1 mol Na₃PO₄ = x mol NaOH / 2.0 mol Na3PO4

Solving for x, we get:

x = (3 mol NaOH / 1 mol Na₃PO₄) × (2.0 mol Na₃PO₄ / 1) = 6.0 mol NaOH

So, 6.0 moles of NaOH are required to produce 2.0 moles of Na₃PO₄.

To find the mass of Na₃PO₄ produced, we can use its molar mass:

mass = moles × molar mass = 2.0 mol × 164 g/mol = 328 g

Therefore, the mass of Na₃PO₄ formed during the reaction is 328 g.

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Answer:

Explanation:

A compound is a substance made up of two or more distinct elements that are chemically linked to one another in chemistry. These components mix in predetermined ratios to produce a special set of attributes that are distinct from those of the individual components. Chemical reactions such as combination, breakdown, or exchange reactions can all result in the formation of compounds. Water (H2O), sodium chloride (NaCl), and carbon dioxide (CO2) are a few examples of compounds. Chemistry is based on the understanding of the composition and behavior of compounds, which is essential for many applications in science and technology.

All three statements are true:

Answer:

Explanation:

Formula for pH of a buffer solution

pH = pKa + log ( moles of sodium benzoate / moles  of benzoic acid)

pKa of benzoic acid = 4.2

Volume of solution is 1.5 L .

moles of sodium benzoate = .29 x 1.5 = .435 moles

moles of benzoic acid  = 1.5 x .34 = .51 moles

Addition of HCl will reduce concentration of salt and increase concentration of acid

moles of sodium benzoate after addition of HCl =  .435 - .054 = .381  moles

moles of benzoic acid  =  .51 + .054  = .564 moles

resultant pH = 4.2 + log ( .381 / .564 )

= 4.2 + log .6755

= 4.029

concentration of H⁺ or H₃O⁺ = \(10^{ - 4.029 }\)

= 9.35 X 10⁻⁵ M .

The concentration of the solution after adding 0.054 mol HCl to the final volume is \(9.35 \times 10^-^5 M .\)

Concentration is the amount of substance present in a specific place.

Calculate the moles of sodium benzoate

The mass of sodium benzoate is 0.29 M

The final volume is 1.5 L

0.29 × 1.5 = 0.435 moles

Now, moles of HCl after adding HCl

0.435 – 0.054 = 0.381  

Moles of benzoic acid

0.51 + 0.054  = 0.564 moles

By the formula of pH

pH = pKa + log ( mol of bezoate / mol of benzoic acid)

pKa value is 4.2

Putting the values

\(4.2 + log \dfrac{0.381}{0.564} \\\\4.2 + log 0.6755\\\\log = 4.029\)

The concentration of H+ is \(10^-^4^.^0^2^9\) = \(9.35 \times 10^-^5 M .\)

Thus, the concentration is \(9.35 \times 10^-^5 M .\)

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Answer:The largest database[1] of organic compounds lists about 10 million substances, which include compounds originating from living organisms and those synthesized by chemists. The number of potential organic compounds has been estimated[2] at 1060—an astronomically high number. The existence of so many organic molecules is a consequence of the ability of carbon atoms to form up to four strong bonds to other carbon atoms, resulting in chains and rings of many different sizes, shapes, and complexities.

The simplest organic compounds contain only the elements carbon and hydrogen, and are called hydrocarbons. Even though they are composed of only two types of atoms, there is a wide variety of hydrocarbons because they may consist of varying lengths of chains, branched chains, and rings of carbon atoms, or combinations of these structures. In addition, hydrocarbons may differ in the types of carbon-carbon bonds present in their molecules. Many hydrocarbons are found in plants, animals, and their fossils; other hydrocarbons have been prepared in the laboratory. We use hydrocarbons every day, mainly as fuels, such as natural gas, acetylene, propane, butane, and the principal components of gasoline, diesel fuel, and heating oil. The familiar plastics polyethylene, polypropylene, and polystyrene are also hydrocarbons. We can distinguish several types of hydrocarbons by differences in the bonding between carbon atoms. This leads to differences in geometries and in the hybridization of the carbon orbitals.

Explanation:

The number of moles of CO2 produced is 0.021 moles

If the estimated volume of the balloon is wrong then the amount of glucose reacted must be more than is stated.

The respiration equation represents the chemical process of aerobic cellular respiration, which occurs in the mitochondria of cells and is the primary way in which cells generate energy in the form of ATP (adenosine triphosphate).

The equation of the reaction is;

C6H12O6 + 6O2 → 6CO2 + 6H2O + ATP

We know that;

Number of moles of glucose = 10 g/180 g/mol

= 0.056 moles

PV = nRT

n = PV/RT

n = 1 * 0.55/318 * 0.082

n = 0.021

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Answer:

A

Explanation:

Answer:

Molecules are moving the fastest and are the farthest apart in the gaseous phase.

Explanation:

Answer:

kindly give options

Explanation:

The concentration (molarity) of the final NaCl solution is 175 M.

To find the concentration (molarity) of the final NaCl solution, we can use the equation:

M1V1 = M2V2

Where M1 is the initial concentration, V1 is the initial volume, M2 is the final concentration, and V2 is the final volume.

In this case, we have an initial NaCl solution with a concentration of 2.5 M and a volume of 350 mL (0.350 L). We are diluting this solution to a total volume of 5.0 mL (0.005 L).

Plugging these values into the equation, we have:

(2.5 M) * (0.350 L) = M2 * (0.005 L)

Simplifying the equation:

0.875 = 0.005 * M2

Dividing both sides by 0.005:

M2 = 0.875 / 0.005

M2 = 175M

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Answer:

3;2

Explanation:

Answer:

False.

Explanation:

(5 kilometers / 30 minutes), you could then say that in 60 minutes (one hour) you would be traveling at (10 kilometers / 60 minutes)...

Therefore, it is unlikely that you would be traveling at (6 kilometers / hour), so the answer should be... False.

Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

Answer:

\(n=0.430molH_2\)

Explanation:

Hello!

In this case, considering the partial Dalton's law of partial pressures, we can notice that the total pressure equals the pressure of steam and the pressure of hydrogen, which can be determined as shown below:

\(p_T=p_H+p_w\\\\p_H=811torr-12torr=799torr*\frac{1atm}{760torr}\\\\p_H=1.05atm\)

Thus, by using the ideal gas law, we can compute the moles of hydrogen as shown below:

\(PV=nRT\\\\n= \frac{PV}{RT}=\frac{1.05atm*10.0L}{0.082\frac{atm*L}{mol*K}*298K}\\\\n=0.430molH_2\)

Best regards!

Answer:

E) Al³⁺

Explanation:

A reaction involving a gain of electrons is known as a reduction reaction because the oxidation number of the species gaining the electron is reduced.

In the given question, the oxidation number (charge) of particle accepting two electrons will decrease by 2. From the given options;

A. K is a neutral atom with oxidation number of 0. If is accepts two electrons, its oxidation number becomes -2.

K + 2e⁻  ----> K⁻²

B) Fe²⁺ has a charge of +2. If it accepts two electrons, its charge comes 0.

Fe⁺ + 2e⁻  ----> Fe

C) O²⁻ has a charge of -2. if it accepts two electrons, it will have a charge of -4.

O²⁻ + 2e⁻  ---->  O⁴⁻

D) Ne has a charge of zero. If it accepts two electrons, its charge becomes -2.

Ne + 2e⁻   ---->   Ne²⁻

E) Al³⁺ has a charge of +3. If it gains two electrons, its charge becomes +1.

Al³⁺ + 2e⁻   ---->   Al⁺

The rate of a reaction refers to how fast or slow a reaction progresses over time. Option B is correct.

It is a measure of the change in concentration of reactants or products per unit of time. The rate of a reaction can be expressed in different units, such as moles per liter per second or grams per second. Factors that can affect the rate of a reaction include the concentrations of the reactants, the temperature, the presence of a catalyst, and the surface area of the reactants.

The rate law equation, which expresses the dependence of the reaction rate on the concentrations of the reactants, can also be used to determine the rate of a reaction under different conditions. The rate of a reaction is important for many applications, such as designing chemical reactions for industrial processes, optimizing reaction conditions in laboratories, and understanding biological processes that involve chemical reactions. Option B is correct.

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Wear personal defence tools, follow the guidelines and be careful with chemicals. Measure 14.72g of \(H_2SO_4\), dissolve in distilled water, and make up to 400mL in a volumetric flask.

1. Always wear appropriate personal protective equipment such as gloves, goggles, and lab coat.

2. Read and follow the instructions carefully before handling any chemical.

3. Handle the chemicals in a well-ventilated area to prevent inhalation of harmful fumes.

To prepare a 0.2M solution of tetraoxosulphate (VI) acid in a \(400cm^3\)  volumetric flask:

Calculate the amount of tetraoxosulphate (VI) acid required using the formula:

Mass = (Molarity x Volume x Molecular weight) / 1000

Where:

Molarity = 0.2M

Volume =\(400cm^3\)

Molecular weight = (4x16) + 32 + (6x16) = 98g/mol

Mass = (0.2 x 400 x 98) / 1000 = 7.84g

Weigh out 7.84g of tetraoxosulphate (VI) acid using a balance.

Transfer the weighed tetraoxosulphate (VI) acid into the \(400cm^3\) volumetric flask using a funnel.

Add distilled water to the flask until the volume reaches the \(400cm^3\) mark on the neck of the flask.

Stopper the flask and mix the solution thoroughly by inverting the flask several times.

It is important to specify the density of the tetraoxosulphate (VI) acid, as this will affect the mass required for the solution. In this case, the percentage purity of the acid is also given, which can be used to calculate the actual mass of the tetraoxosulphate (VI) acid needed.

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The society with the least negative effects on the environment is probably the one with a small population, traditional farming methods, no access to contemporary technology, and self-sufficient food production.

This is due to the fact that their way of living is less dependent on modern infrastructure and technology, both of which have a negative impact on the environment. Additionally, their agricultural methods are probably more environmentally friendly and sustainable.

The environmental effects of the other societies on the list would all be greater. Because of the use of fossil fuels and the production of products that require a lot of resources, a big, industrialized society with high levels of consumption would have a significant carbon footprint.

It would still take a lot of resources to maintain its infrastructure and create products in a less populous, highly industrialized society with moderate consumption levels, which would have a negative effect on the environment.

Given that the size of the population alone would necessitate significant resource consumption and infrastructure development, a big population with moderate industrialization and consumption levels would also have a big effect on the environment.

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Answer: The reaction gives a diol

Explanation:

Please see the attachment below

Answer:

It was the first model to explain Rutherford's scattering experiments which showed that almost all the mass in an atom is concentrated around a small point. Bohr was also the first to show how a kind of wave model of electrons could produce the spectral lines