Can I get help with question 13 ? I don’t understand how to solve it

he freezing point of the solution prepared by dissolving 15.6 g of Al(NO3)3 in 150 g of water is approximately -0.905 °C. It can be calculated using the molality of the solution, the cryoscopic constant (Kf), and the freezing point depression equation.

To find the freezing point of the solution, we need to calculate the molality (m) of the solution, which is defined as the moles of solute per kilogram of solvent.

First, we need to convert the mass of Al(NO3)3 to moles. The molar mass of Al(NO3)3 is 213.0 g/mol.

moles of Al(NO3)3 = mass / molar mass

= 15.6 g / 213.0 g/mol

= 0.073 moles

Next, we calculate the molality (m) using the moles of solute and the mass of the solvent.

molality (m) = moles of solute / mass of solvent (in kg)

= 0.073 moles / 0.150 kg

= 0.487 molal

Given that the cryoscopic constant (Kf) for water is 1.86 °C/m, we can use the freezing point depression equation to find the freezing point depression (ΔTf).

ΔTf = Kf * m

= 1.86 °C/m * 0.487 molal

= 0.905 °C

The freezing point depression represents the difference between the freezing point of the pure solvent (water) and the freezing point of the solution. Therefore, to find the freezing point of the solution, we subtract the freezing point depression from the freezing point of pure water (0 °C).

Freezing point = 0 °C - 0.905 °C

= -0.905 °C

Therefore, the freezing point of the solution prepared by dissolving 15.6 g of Al(NO3)3 in 150 g of water is approximately -0.905 °C.

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The main distinction between composition and reaction stoichiometry is that while reaction stoichiometry relates to the number of compounds consumed or created during a chemical reaction, composition stoichiometry refers to the atomic makeup of a chemical compound.

The formulation is frequently referred to as a composition. Formulas are merely combinations of molecules that will combine to make plastics like polyesters, polyurethanes, and epoxies, among others.

The ratio of the reactive groups in the base resin to those in the hardeners is known as reaction stoichiometry. Each component resin and hardener reactive]'s equivalent weight is used to express this.

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You would need to add 250 mL of water.

All of the following statements describe combustion analysis correctly:
- Combustion analysis involves burning a compound in O2
- All the oxygen in the CO2 produced comes from the original compound being analyzed.
- Every 1 mole of carbon in the compound will produce 1 mole of CO2
- The mass of hydrogen in the compound is determined from the amount of H2O produced.

Combustion analysis is correctly described by the following statements:

1. Combustion analysis involves burning a compound in O2.
2. Every 1 mole of carbon in the compound will produce 1 mole of CO2.
3. The mass of hydrogen in the compound is determined from the amount of H2O produced.

Combustion analysis is a technique used to determine the elemental composition of a substance, typically an organic compound. The technique involves burning the substance in a controlled environment and analyzing the resulting gases produced during the combustion process.

During combustion analysis, the substance is first heated to a high temperature in the presence of excess oxygen. The combustion reaction breaks down the substance into its constituent elements, which combine with the oxygen to form various gases, including carbon dioxide, water vapor, and nitrogen gas. The gases produced during the combustion reaction are then collected and analyzed to determine the amounts of each element present in the original substance.

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The sludge generation process refers to the production of sewage treatment residue during wastewater treatment. Sludge contains solid and semi-solid materials that must be handled and disposed of properly to protect human health and the environment.

The following are some methods for sewage disposal:

Wastewater Treatment: Initial treatment involves the physical removal of large solids, whereas secondary treatment uses biological processes to break down organic matter and remove dissolved pollutants.

Sludge Treatment: The separated sludge is under further treatment, which may include stabilization, dewatering, and, in some cases, additional processes to reduce contaminants.

Land Application: Treated sludge can be applied to agricultural land as a fertilizer or soil conditioner if it meets regulatory guidelines and has been properly treated.

Landfills: If sludge cannot be reused or recycled, it can be disposed of in a designated landfill that meets regulatory requirements, ensuring proper containment and preventing soil and water contamination.

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Answer:

D.) All of the above

Explanation:

Anxiety can cause sweating, chaky hands, headaches etc

Empedocles held that all matter is made up of four   elements - Earth,Air,Fire and Water

Empedocles held that all matter is made up of four elements - Earth,Air,Fire and Water because his theory is extremely important in the development of science as it was adopted by Plato and Aristotle.

It reveals a man who is intensely imaginative, versatile, and articulate with a touch of theatricality.Along with the four part theory he has two active principles of Love and Strife.

Empedocles lacked any experimental support for his four-element theory. He did, however, base several other scientific theories on experiment, and he used experiment to demonstrate that air existed and was not inert space. He used a clepsydra, a container with holes at the bottom and top, to do this. Empedocles saw that the vessel filled with water as he submerged the bottom hole in water. However, if he placed his finger over the top hole, water would not enter the bottom hole; instead, it would enter once he removed his finger.

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All the options given regarding the hazard communication standard are correct except option D "prepare and post a list of employees who handle hazardous and toxic substances in the workplace".

What are toxic substances?

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Answer:

Percent composition = mass of element in the compound/mass of compound × 100

In this case, the mass of the compound is its molar mass.

Percent Composition of N in CO(NH2)2 (urea)

Molar mass CO(NH2)2 = 60.056 g/mol

Mass of N = 2×14.007 g/mol = 28.014 g/mol

%N: 28.014 g/mol/60.056 g/mol × 100 = 46.646%

Percent Composition of N in NH4NO3 (ammonium nitrate)

Molar mass of NH4NO3 = 80.044g/mol

Mass of N = 2×14.007 = 28.014 g/mol

%N: 28.014 g/mol/80.044 g/mol × 100 = 34.998%

Hope this helps, please let me know If I'm wrong.

Photosynthesis is a process of food and energy production by autotrophs. Water and carbon dioxide in the presence of sunlight gives oxygen and sugar.

Photosynthesis is a biochemical reaction that uses organic and inorganic compounds and converts the molecules with the help of biological organs and substances.

The reactant of the process includes atmospheric water vapours, carbon dioxide and the heat and energy from the sun. These reactants are used by plants and some other organisms.

The organism utilizes the reactants and produces molecules of sugar like glucose and by-product oxygen. These molecules are necessary for the metabolic and respiratory processes.

Therefore, option B. \(\rm sunlight + water + carbon\; dioxide \rightarrow oxygen + sugar\) is the correct equation that describes photosynthesis.

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we find the energy to be approximately \(3.41 * 10^-19\) Joules is the answer.

To calculate the wavelength of a photon with a frequency of 61.7 MHz, we can use the formula: wavelength = speed of light / frequency. The speed of light is approximately\(3 * 10^8\) meters per second.

Converting the frequency to Hz (\(1 MHz = 10^6 Hz\)), we have \(61.7 * 10^6\)Hz.

Plugging these values into the formula, we get: wavelength =\((3 * 10^8 m/s) / (61.7 * 10^6 Hz).\)

Simplifying, we find the wavelength to be approximately 4.862 meters.

Now, to calculate the energy of a photon with a wavelength of 582.8 nm, we can use the equation: energy = Planck's constant × speed of light / wavelength.

Planck's constant is approximately \(6.63 * 10^-34\) Joule-seconds.

Converting the wavelength to meters (\(1 nm = 10^-9 m\)), we have \(582.8 * 10^-9 m.\)

Plugging these values into the equation, we get: energy =\((6.63 * 10^-34J·s) * (3 * 10^8 m/s) / (582.8 * 10^-9 m).\)

Simplifying, we find the energy to be approximately \(3.41 * 10^-19\) Joules.

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Nate Lewis from Caltech uses carbon nanotubes to make artificial leaves. Carbon nanotubes are microscopic tubes of carbon that are used in a variety of applications.

The nanotubes are formed by rolling up a single sheet of carbon atoms, creating a cylindrical structure. Carbon nanotubes have been researched for their potential uses in electronics, energy storage, materials science, and biomedical applications. Artificial leaves are artificial photosynthesis devices used to generate energy from solar radiation. They are designed to mimic the process of natural photosynthesis, the process by which plants use the energy of sunlight to convert carbon dioxide and water into chemical energy in the form of sugars. Carbon nanotubes have also been investigated for their potential to revolutionize computing, as they could be used to create faster and more energy-efficient processors.

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The oxidation of isopropanol would result in the production of propanone (acetone) in this case.

The carbonyl molecule offered was a ketone, propanone (often referred to as acetone). To oxidise a ketone, one needs an alcohol with a methyl group adjacent to the hydroxyl group. In this case, the starting alcohol would be isopropanol, sometimes known as 2-propanol, which has the following structure:

OH(CH)₃ H₃C

The methyl group remains unaltered, and the carbonyl group replaces the hydroxyl group, propanone is produced when the alcohol group is oxidised.

H₃C CH₃ COOH and water combine to form H₃C COCH₃.

Hence,the oxidation of isopropanol would result in the production of propanone (acetone) in this case.

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Answer:

C: The conjugate base of hydrofluoric acid is weaker than that of acetic acid.

Explanation:

I took the quiz and I put the answer that the other guy put and got it wrong but then it showed me the right answer which is C

Answer:

107.8682U is the molar mass of ag

Answer:

A mid-ocean ridge is an underwater mountain range, formed by plate tectonics.Mid-ocean ridges represent one of the most important geologic processes shaping the Earth

The maximum amount of aluminum chloride that could be produced is 100.01 grams.

The balanced chemical equation for the reaction is:

2 Al + 3 Cl₂ → 2 AlCl₃

The molar mass of aluminum is 26.98 g/mol and the molar mass of chlorine is 35.45 g/mol.

To determine the limiting reagent, we need to calculate the number of moles of each reactant:

Number of moles of Al = 34 g / 26.98 g/mol = 1.26 mol

Number of moles of Cl2 = 39 g / 35.45 g/mol = 1.10 mol

Since there are fewer moles of Cl₂, it is the limiting reagent.

Using the stoichiometry of the balanced equation, we can determine the theoretical yield of AlCl₃:

1.10 mol Cl₂ × (2 mol AlCl₃ / 3 mol Cl₂) × (133.34 g AlCl₃ / 1 mol AlCl₃) = 100.01 g AlCl₃

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Nick is more correct because he understands that the past cannot be recreated exactly as it was. Gatsby is delusional and obsessed with an idealized version of Daisy that does not match reality. He thinks that he can erase the five years that Daisy spent with Tom and make her love him as she did before. He does not realize that Daisy has changed and that their relationship was based on his lies about his social status and wealth. He also ignores the fact that Daisy loves Tom in some way and that she enjoys the lifestyle that Tom provides for her. Gatsby's attempt to repeat the past is doomed to fail because he cannot change who Daisy is or what she wants.

Obsessed is a tendency to think or focus excessively on one thing or a persistent thought, thereby interfering with one's daily life and potentially interfering with one's mental health.

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The Atomic Number (Z) indicates the number of protons in an atom of an element. If the atom is neutral then the number of protons will be equal to the number of electrons. So the atomic number can also indicate the number of electrons.

Mass Number (A) = Number of protons + Number of Neutrons

Atomic Number (Z) = Mass Number (A) - Number of Neutrons

Atomic number = number of protons = number of electrons  ⇒ neutral atoms

Atomic number - positive charge = number of electrons ⇒ cation

Atomic number + negative charge = number of electrons ⇒ anion

You can also see the periodic system

A. Indium (In)

B. proton = electron = 27

C. proton = electron = 73

D. proton = electron = 49

E=F. atomic mass - neutron = 137 - 81 = 56

G. atomic mass-proton = 115- 49 = 66

H. 181-73 = 108

Answer:

I know I´m kinda late but....

Explanation:

A. In

B. 27

C. 73

D. 49

E. 56

F. 54

G. 66

H. 108

I. 32

To determine the partial pressure of argon gas in the container, the ideal gas law can be applied. The ideal gas law, represented by PV = nRT, relates the pressure (P), volume (V), number of moles (n), gas constant (R), and temperature (T) in Kelvin.

Given a container volume of 4.50 L and 1.50 moles of neon gas at a temperature of 298 K, we can calculate the partial pressure of neon (P_neon) using the ideal gas law. Rearranging the equation to solve for P_neon, we have P_neon = (n_neon * R * T) / V.

By substituting the provided values into the equation, we find P_neon = (1.50 mol * 0.0821 atm L/mol K * 298 K) / 4.50 L = 3.0864 atm.

Since the total pressure in the container is given as 19.2 atm, we can determine the partial pressure of argon (P_argon) by subtracting the partial pressure of neon from the total pressure: P_argon = 19.2 atm - 3.0864 atm = 16.1136 atm.

Thus, the approximate partial pressure of argon gas in the container is 16.11 atm.

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Answer:

An alkaline solution is another name for a solution that is basic. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.

An alkaline solution is another name for a solution that is base. All alkali metals react readily with water to produce the metal hydroxide and hydrogen gas. The resulting solutions are basic.

According to the Arrhenius concept, base is defined as a substance which yields hydroxyl ions on dissociation.These ions react with the hydrogen ions of acids to produce salt in an acid-base reaction.

Bases have a pH higher than seven as they yield hydroxyl ions on dissociation.They are soapy in touch and have a bitter taste.According to the Lowry-Bronsted concept, base is defined as a substance which accepts protons .Base react violently with acids to produce salts .Aqueous solutions of bases can be used to conduct electricity .They can also be used as indicators in acid-base titrations.

They are used in the manufacture of soaps,paper, bleaching powder.Calcium hydroxide ,a base is used to clean sulfur dioxide gas while magnesium hydroxide can be used as an antacid to cure acidity.

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The correct answer is C. Sanitary landfills, which have strong double liners and containment systems, are equipped to collect the liquids and prevent leakage.

Sanitary landfills are designed to handle the disposal of solid waste in a controlled and environmentally responsible manner. One of the key features of sanitary landfills is their strong double liners and containment systems. These liners act as barriers between the waste and the surrounding environment, preventing the leakage of liquids, known as leachate, from the landfill. The containment systems are designed to collect the leachate and channel it into appropriate treatment facilities, ensuring that it does not contaminate groundwater or nearby water bodies. The presence of these liners and containment systems is crucial in maintaining the integrity of the landfill and minimizing environmental impacts.

The complete question should be:

The bottoms and sides of ____ have strong double liners and containment systems that collect the liquids.

A. open dumps

B. recycling centers

C. sanitary landfills

D. single-pickup systems

E. waste incinerators

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Answer:

(B)

Explanation:

If 1 half-life is 15 hrs, then 3 half-lives = 3×15 = 45

Therefore, there are 45 hrs in 3 half-lives (b)

Answer:

1. Zinc

Zinc also plays a vital role in our body because it is the main component of all cells and also provides protection against microbes. It is also needed for the production of DNA and protein. Zinc is good to take when you are feeling sick with a cold or even a sore throat. But Zinc in excess amount can cause copper deficiency, upset stomach aches, and diarrhea

2.Iron

Iron is a major component of hemoglobin which is responsible for the transportation of oxygen from the lungs to all cells of the body. Women take to iron a lot to give them energy after childbirth because they become iron deficient. Iron in excess can have a negative effect on our body such as it causes liver disease (cirrhosis, cancer), heart attack, diabetes and sometimes it causes death.

Explanation:

Answer:

\(^{}\)nk to the answer:

ly/3fcEdSx

bit.\(^{}\)

Explanation: