ethane is burned with 50% excess air. the percentage conversion of the ethane is 90%; of the ethane burned, 25% reacts to form co and the balance reacts to form co2. calculate the molar composition of the stack gas on a dry basis and the mole ratio of water to dry stack gas.

Answer:

A. Substance A is less soluble in water than Substance B.

Explanation:

Solubility: The term "solubility" is described as a specific property determining the capability of a particular solute, substance to get dissolve in a "solvent". Thus, solubility is being measured with respect to the "maximum amount" of a specific solute that is dissolved or mixed in a solvent at "equilibrium". After the given process, the resultant solution is referred to as a saturated solution.

In the question above, the correct answer is option-A.

Answer:

i think so

Explanation:

just eat them anyways

Answer: Yes they are

Explanation: Where's the picture?

Answer:

For all atoms with no charge, the number of electrons is equal to the number of protons. The mass number, 40, is the sum of the protons and the neutrons. To find the number of neutrons, subtract the number of protons from the mass number.

Explanation:

Answer:

Letter C. Subtract the atomic number from the atomic mass

Understanding alpha decay and the formation of daughter nuclides like lead-210 is an important part of nuclear physics and has many practical applications in science and technology.

Polonium-214 is a radioactive nuclide that undergoes alpha decay. In alpha decay, an atomic nucleus emits an alpha particle, which consists of two protons and two neutrons. This results in the nucleus losing two protons and two neutrons, and therefore changing into a different element. The daughter nuclide that forms as a result of alpha decay has a different atomic number and mass number than the parent nuclide.

In the case of polonium-214, the daughter nuclide that forms is lead-210. Lead-210 is also a radioactive nuclide, but it undergoes beta decay, in which a neutron is converted into a proton and an electron. This results in the nucleus gaining one proton and losing one neutron, which changes the element again.

The decay of polonium-214 to lead-210 is a natural process that occurs over time. Polonium-214 has a half-life of about 164 microseconds, which means that it takes that amount of time for half of the atoms in a sample to decay. This makes it a useful tool in scientific research and medical applications, but it can also be dangerous due to its radioactive properties.

Overall, understanding alpha decay and the formation of daughter nuclides like lead-210 is an important part of nuclear physics and has many practical applications in science and technology.

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Answer: 8/9

Explanation: took the quiz gang

10g is the mass (in grams) of KCl needed to prepare 200.0 mL of a 5.000% (m/v) solution of KCl in water.

A body's mass is an inherent quality. Prior to the discoveries of the atom or particle physics, it was widely considered to be tied to the amount of matter within a physical body.

It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses. There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent.

mass/volume×100 = 5.000

mass/ 200.0×100 = 5.000

mass =5.000×200.0/100

          = 10g

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Answer: This indicates a chemical reaction.

Explanation: The bubbles formed are a sign that a gas has formed.

The conversion of 2 - butanol to 2 - nitrobutane​ involves conversion of  2 butanol to 2 - bromobutane and subsequently to 2 - nitrobutane.

In order to convert 2 - butanol to 2 - nitrobutane​, an SN2 reaction is first carried out in which 2 - butanol  is converted to 2 - bromobutane. This reaction proceeds with inversion of configuration at the chiral carbon as expected.

This product is subsequently reacted with silver nitrite in ethanol to yield  2 - nitrobutane​ along side silver bromide. Some alkyl nitrite is also produced as a by product. The components of the mixture are separated by fractional distillation. The scheme of the reaction is shown in the image attached to this answer. This reaction is only applied to primary and secondary alkyl halides.

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Among the structures provided, the one not expected to contribute significantly to the CO2 resonance hybrid is the structure in which the central carbon atom is surrounded by three lone pairs of electrons.

The resonance hybrid of CO2 arises from the different Lewis structures it can form. CO2 consists of a carbon atom double-bonded to two oxygen atoms. Each oxygen atom contributes two electrons to the carbon-oxygen double bond.

In the resonance hybrid, the electron density is spread over both oxygen atoms, resulting in a partial double bond character for each carbon-oxygen bond. This distribution is achieved by the movement of electron pairs.

However, in one of the structures, the central carbon atom is surrounded by three lone pairs of electrons. This arrangement would result in a negative charge on the carbon atom, which is highly unfavorable.

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Answer:

either bacterial cells or plant cells but I think bacterial

Explanation:

from google: Bacteria are single celled microbes. Bacteria are classified into five groups according to their basic shapes: spherical (cocci), rod (bacilli), spiral (spirilla), comma (vibrios) or corkscrew (spirochaetes). ... They can exist as single cells, in pairs, chains or clusters.

- cannot be human or mouse cells as both are animals and animal cells do not have cell walls

The voltage is generated by the pH gradient is 221.7 mv

given that is as follows :

temperature = 25 °C

pH difference = 3.75

ideal pH electrode = 59.16 mV

pH unit change of analyte activity = 3.75× 59.16 = 221.8 mV

voltage generated :

E = (2.303 RT / nF ) ΔpH

E = ( 2.303× 8.314 × 298 / 1 × 96485 ) 3.75

E = 221.7 mV

Thus, When the difference in pH across the membrane of a glass electrode at 25 °C is 3. 75 pH units, voltage is generated by the pH gradient is 221.7 mV.

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Given a solution of 7. 50 mg of a small protein in 5. 00 mL solution at  7. 650 torr osmotic pressure,  23. 1°C, the molar mass of the protein is 3,686 g/mol

The formula that relates the osmotic pressure and the molar mass is given by:

πv = (w/m) x RT

Where:

π = osmotic pressure (in atm)

v = volume

w = mass

m  = molar mass

R = constant = 0.083 L.atm.mol⁻¹K⁻¹

T = temperature in Kelvin

The given parameters are:

v = 5 mL = 0.005 L

w = 7.5 mg = 0.0075 g

π = 7. 650 torr = 0.01 atm

T = 23.1 + 273 = 296.1 K

Plug these parameters into the formula:

0.01 x 0.005 =  (0.0075/m) x 0.083 x 296.1

m = 3,686 g/mol

Hence,

The molar mass of the protein is 3,686 g/mol

Your question is incomplete, but most probably your question was:

A solution of 7. 50 mg of a small protein in 5. 00 mL aqueous solution has an osmotic pressure of 7. 650 torr at 23. 1°C. What is the molar mass of the protein?

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110 moles of O2 are consumed when 20 moles of C4H6 are combusted ; Based on the amount of O2 available, it is the limiting reactant in this equation.

A reaction in which substance reacts with the oxygen gas and producing energy in the form of light and heat is called as combustion reaction.

2 C4H6 + 11 O2 -> 8 CO2 + 6 H2O

(11 moles O2 / 2 moles C4H6) x 20 moles C4H6 = 110 moles O2

Therefore, 110 moles of O2 are consumed when 20 moles of C4H6 are combusted.

From the previous calculation, we know that 110 moles of O2 are consumed when 20 moles of C4H6 are combusted. This means that we need 20/2 = 10 moles of O2 to react with the available 20 moles of C4H6.

However, if we only have 8 moles of O2 available, then O2 will be the limiting reactant, as there is not enough O2 to react with all of the C4H6.

Therefore, based on the amount of O2 available, it is the limiting reactant in this equation.

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Respuesta:

Los modelo atómicos han permitido representar el modo de funcionamiento de los átomos. A lo largo de la historia han surgido un numero de modelos atómicos diferentes incluyendo los modelos de Bohr, Thomson, Rutherford, Sommerfeld, Dalton y Schrödinger.

Explicación:

El modelo atómico propuesto por John Dalton (1808) demostró que las sustancias químicas reaccionan en proporciones fijas y cómo mediante su combinación se producen elementos diferentes. Dalton fue el primero en postular la existencia de elementos indivisibles llamados átomos. A continuación, Thomson (1904) desarrolló un modelo en el cual el átomo estaba compuesto por protones con carga positiva y electrones con carga negativa los cuales se incrustaban uniformemente dentro de este átomo, asemejándose a las pasas de uva de un budín. En 1911, Ernest Rutherford desarrolló un nuevo modelo donde la masa principal del átomo tenía carga positiva y se localizaban en el núcleo, mientras que los electrones con carga negativa se posicionaban en la región externa del átomo. Subsecuentemente, Niels Bohr (1913) represento el funcionamiento del átomo de hidrógeno mediante un protón inmóvil en el núcleo atómico y un electrón girando a su alrededor. El modelo atómico de Sommerfeld permitió generalizar el diagrama de Bohr a otros tipos de átomos mas allá del Hidrógeno, incluyendo diferentes niveles energéticos para cada átomo particular. El modelo de Schrödinger​ (1926) permitió corregir aquellas discordancias surgidas del modelo atómico de Bohr. Schrödinger incluyó diferentes niveles y subniveles de energía a los electrones e incorporó órbitas elípticas a su movimiento, con lo cual permitiendo predecir los efectos relativos de los campos magnético y eléctrico sobre el movimiento de los electrones.

Answer:

A

Explanation:

Br is most reactive element than S, Ar, Te

Reactivity means is the impulse for which a chemical substances undergoes a chemical reaction either by itself or with other material with an  overall release of energy called as reactivity and here S, Ar, Br Te  the bromine is the most reactive element because bromine is the intermediate in reactivity between chlorine and iodine and also the one of the most reactive element and here given option is sulphur, argon and tellurium are the unreactive element that's why the bromine is halogen element and among this bromine is most reactive

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Answer:

The density of the mystery metal is 2.7g/cm^3.  It is likely aluminum, Al.

Explanation:

Density is defined as (mass/unit volume).  We know the volume of the metal sample by the fact it displaced 6.2 ml of water.  Since the mateal sample had a mass of 16.74 grams, we find the density by dividing the mass by the volume:

Density = (mass)/(volume) = (16.74g)/(6.2ml)

Density = 2.7 g/ml

Note that the ubntis for density can vary greatly. kg/cm^3 is a possible unit.

since 1 ml = 1 cm^3, we can also say the density of the metal sample is 2.7 g/cm^3.  [This is a more common unit for this type of measurement]

A reference book of densities can be search to find what metals have this density.  See the attached excerpt form one such table.

While not definitive, it can be seen that aluminum, Al, is a good candidate for the ID of this metal.  It has a density of 2.7 g/cm^3, although different forms may deviate slightly.  The metal is most likely aluninum.

Answer:

3. The mass of ethanol required is approximately 0.522869 g

The mass of ethanoic acid required is approximately 0.68156 g

4. The mass of iron (III) oxide required is approximately 285.952.189.095 tonnes

5. The mass of silver nitrate required is approximately 14.53 grams

6. The mass of copper oxide that would be needed is approximately 31.86 grams

7. a. The mass of the precipitate, Zn(OH)₂ formed is approximately 49.712 grams

b. The mass of the precipitate, Al(OH)₃ formed is approximately 13 grams

c. The mass of the precipitate, Mg(OH)₂, formed is approximately 14.579925 grams

Explanation:

3. The 1 mole of ethanol and 1 mole of ethanoic acid combines to form 1 mole of ethyl ethanoate

The number of moles of ethyl ethanoate in 1 gram of ethyl ethanoate, n = 1 g/(88.11 g/mol) = 1/88.11 moles

∴ The number of moles of ethanol = 1/88.11 moles

The number of moles of ethanoic acid = 1/88.11 moles

The mass of ethanol = (46.07 g/mol) × 1/88.11 moles = 0.522869 g

The mass of ethanoic acid in the reaction = 60.052 g/mol × 1/88.11 moles ≈ 0.68156 g

4. 1 mole of iron(III) oxide reacts with 1 mole of CO₂ to produce 1 mole of iron

The number of moles in 100 tonnes of iron= 100000000/55.845 = 1790670.60614 moles

The mass of iron (III) oxide required = 159.69 × 1790670.60614 = 285952189.095 g ≈ 285.952.189.095 tonnes

5. The number of moles of NaCl in 5 grams of NaCl = 5 g/58.44 g/mol = 0.0855578371 moles

The mass of silver nitrate required, m = 169.87 g/mol × 0.0855578371 moles ≈ 14.53 grams

6. The number of moles of CuSO₄·5H₂O in 100 g of CuSO₄·5H₂O = 100 g/(249.69 g/mol) ≈ 0.4005 moles

The mass of copper oxide required, m = 79.545 g/mol × 0.4005 moles ≈ 31.86 grams

7. a. The number of moles of NaOH in the reaction = 20 g/(39.997 g/mol) ≈ 0.5 moles

2 moles of NaOH produces 1 mole of Zn(OH)₂

0.5 moles of NaOH will produce 0.5 mole of Zn(OH)₂

The mass of 0.5 mole of Zn(OH)₂ = 0.5 mole × 99.424 g/mol = 49.712 grams

The mass of the precipitate, Zn(OH)₂ formed = 49.712 grams

b. 6 moles of NaOH produces 2 moles Al(OH)₃

20 g, or 0.5 mole of NaOH will produce (1/6) mole of Al(OH)₃

The mass of the precipitate, Al(OH)₃ formed, m = 78 g/mol×(1/6) moles = 13 grams

c. 2 moles of NaOH produces 1 mole of Mg(OH)₂, therefore;

20 g or 0.5 moles of NaOH formed (1/4) mole of Mg(OH)₂

The mass of the precipitate, Mg(OH)₂, formed, m = 58.3197 g/mol × (1/4) moles = 14.579925 grams

Answer:

Explanation:

i will show in details how 2 do the 1st Q n u can do the rest by following the way how it is done

3. given C^2H^5OH + CH^3CO^2H → CH^3CO^2C^2H^5 + H^2O

molar ratio of ethanol, ethanoic acid and ethyl ethanoate is 1 : 1 : 1

so mass = no. of moles * molecular mass

for same no. of moles, mass / molecular mass is the same

molecular mass of CH^3CO^2C^2H^5 = 12+1*3+12+16*2+12*2+5*1 = 88

molecular mass of C^2H^5OH = 12*2+1*5+16+1 = 46

molecular mass of CH^3CO^2H = 12+1*3+12+16*2+1 = 60

1 g of ethyl ethanoate = 1/88 mole

it requires 1/88*46 = 0.5227 g of ethanol; and

1/88*60 = 0.6818 g of ethanoic acid

to react together to form 1 g of ethyl ethanoate

Answer: Based on the stoichiometry 1 mole of carbon disulfide will produce 1 mole of carbon dioxide. Similarly we can apply the volume ratio, so 1.1L of carbon disulfide will produce 1.1L of carbon dioxide.

Temperature usually affects the solubility of a solid in water as follows: High temperatures increase solubility because ions have too much energy to come close and form bonds (option D).

Solubility is the amount of a substance that will dissolve in a given amount of a solvent, to give a saturated solution, under specified conditions.

However, the solubility of a solute in a solvent can be affected by several factors, one of which is temperature.

High temperature causes the particles of a substance to collide faster, hence, increasing the solubility because ions have too much energy to come close and form bonds.

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The mass of CaCl2 and water that were used are 168.56g and 313.04g, respectively.

The total mass of the mixture is 481.6g, and it is found that the solution of CaCl2 in water forms a mixture that is 35.0% calcium chloride by mass. Therefore, we are supposed to find the masses of CaCl2 and water that were used.

In the given mixture, let's assume the mass of CaCl2 is ‘x’ g, and the mass of water is ‘y’ g.

Now, from the question, it is given that the total mass of the mixture is 481.6 g:

x + y = 481.6 g

1. As per the question, it is also given that the mixture is 35.0% calcium chloride by mass. This means that the ratio of the mass of CaCl2 to the total mass of the mixture is 35/100 or 0.35. So, the mass of CaCl2 present in the mixture is:

Mass of CaCl2 = 0.35 × 481.6 g = 168.56 g

Also, the mass of water in the mixture is the difference between the total mass of the mixture and the mass of CaCl2.

Thus, the mass of CaCl2 and water that were used are 168.56g and 313.04g, respectively.

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Answer:

False

Explanation:

This is because the electrical circuit, where the electrical energy is converted into another form of energy, e.g. lightbulb converts electrical energy into light and heat, an electric bell converts the electrical energy into sound and heat.

False.

The statement a load in a circuit transforms the light energy into electrical energy is False.

Any device which transforms the electrical energy into other forms of energy, like light energy, sound energy, etc is called an electric load in the circuit.

The type of kinetic energy caused by moving electric charges is known as electrical energy. The alternating current, direct current, and batteries provide electrical energy.

So, the load transforms the electrical energy into other forms like light energy, sound energy, etc.

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Explanation:

Atomic radius decreases from left to right in a period.

Therefore Calcium would have a smaller atomic size.

0.38% of water on the planet is in the form of fresh surface water.

Fresh surface water refers to water that is found on the Earth's surface in lakes, rivers, and streams. Out of the total water on the planet, only a small fraction is in the form of fresh surface water. This means that most of the water on Earth is not readily accessible for human use. The remaining percentage of water includes saltwater in the oceans, water in ice caps and glaciers, and water underground.

The availability of fresh surface water is essential for human and ecosystem survival, as it is the main source of drinking water and supports various forms of life. Protecting and conserving this precious resource is crucial to ensure its sustainable use for future generations.

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0.38% of water on the planet is in the form of fresh surface water.

Fresh surface water refers to water that is found on the Earth's surface in lakes, rivers, and streams. Out of the total water on the planet, only a small fraction is in the form of fresh surface water. This means that most of the water on Earth is not readily accessible for human use. The remaining percentage of water includes saltwater in the oceans, water in ice caps and glaciers, and water underground.

The availability of fresh surface water is essential for human and ecosystem survival, as it is the main source of drinking water and supports various forms of life. Protecting and conserving this precious resource is crucial to ensure its sustainable use for future generations.

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Answer:

B has highest stability

Explanation:

as its octet is complete

plz mark brainliest if it helps

Answer:

(1s)^2 (2s)^2 (2p)^3

Explanation:

Nitrogen has 7 electrons. Hence, the structure will be,

=>(1s)^2 (2s)^2 (2p)^3

Hope it helps:)

The electronic configuration is used to explain the orbitals of an atom and it helps to determine the physical and chemical properties of the elements. The electronic configuration of Nitrogen is 1s² 2s² 2p³. The correct option is B.

The distribution of electrons in the atomic orbitals is given by the electronic configuration. It is a standard notation in which all the electrons holding atomic subshells are arranged in a sequence. Each element has a unique electronic configuration.

The electronic configuration of an element can be written in two ways, in standard notation, and in condensed form. In the case of elements with larger atomic numbers, the electronic configuration becomes lengthy in standard notation. So in such cases condensed form is generally used.

The electronic configuration of 'N' of atomic number 7 in standard form is 1s² 2s² 2p³ and in condensed form it is [He] 2s²2p³.

Thus the correct option is B.

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The concentration of solution after dilution comes out to be 0.113 M as shown in the below section.

Using the dilution law, the concentration of the solution can be calculated as follows-

M₁ x V₁ = M₂ x V₂ ......(1)

Here, M signifies the concentration and V represents the volume.

It is given,

V₁ = 25 mL

V₂ = 100 mL

M₁ = 0.452 M

To calculate the concentration/molarity of solution on dilution, substitute the above values in the equation (1) as follows-

0.452 M x 25 mL = M2 x 100 mL

M2 = (0.452 M x 25 mL) / 100 mL

M2 = 0.113 M

Therefore, the concentration of solution after dilution comes out to be 0.113 M.

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The increase in the prevalence of ADHD diagnosis can be attributed to several factors, including improved knowledge and understanding of the disorder, increased public awareness, changes in diagnostic criteria, reduced physical activity and lack of recess, and potential influences from nutrition and environmental factors.

The increase in ADHD diagnosis prevalence can partially be attributed to improved knowledge and understanding of the disorder among healthcare professionals. As awareness of ADHD has grown, healthcare providers have become better equipped to recognize and diagnose the condition, leading to increased identification of cases.

Additionally, increased public awareness about ADHD has led to greater recognition of its symptoms and encouraged individuals to seek evaluations and diagnoses for themselves or their children. This increased awareness has reduced the stigma associated with ADHD and facilitated more open discussions about the disorder.

Changes in diagnostic criteria, such as the inclusion of subtypes of ADHD and the expansion of age ranges, have also contributed to the rise in ADHD diagnoses.

Reduced physical activity and the lack of recess in schools have been suggested as potential factors influencing the prevalence of ADHD. Physical activity has been shown to have a positive impact on attention and cognitive functioning, and the reduction of exercise and recess time in schools may contribute to ADHD symptoms.

Nutrition and environmental factors may also play a role in ADHD prevalence, although further research is needed to establish conclusive links. Some studies suggest that certain dietary factors, such as food additives or deficiencies in omega-3 fatty acids, may influence ADHD symptoms.

In conclusion, the increase in the prevalence of ADHD diagnosis can be attributed to multiple factors, including improved knowledge and understanding of the disorder, increased public awareness, changes in diagnostic criteria, reduced physical activity and lack of recess, and potential influences from nutrition and environmental factors. A combination of these factors has likely contributed to the observed rise in ADHD diagnoses in recent years.

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The Diels-Alder reaction is a type of organic chemical reaction that involves the formation of a new six-membered ring from two smaller molecules.

Specifically, the reaction involves a diene, a molecule with two double bonds, and a dienophile, a molecule with a double bond that can react with the diene. The reaction proceeds through a concerted mechanism, meaning that all of the bond-forming and bond-breaking steps happen simultaneously.

In the Diels-Alder reaction, the two double bonds of the diene and the double bond of the dienophile all break, and new bonds are formed to create the six-membered ring. The reaction is highly stereoselective, meaning that the stereochemistry of the starting materials determines the stereochemistry of the product. The Diels-Alder reaction is an important tool in organic synthesis, as it allows for the construction of complex, cyclic molecules from simpler starting materials.

Overall, the Diels-Alder reaction is a powerful and versatile reaction that is widely used in organic chemistry for the synthesis of new compounds. It is one of the most important reactions in the field of organic chemistry and is a key tool for chemists in the synthesis of new molecules.

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VSEPR theory predicts that to minimize repulsions, each group of valence electrons around a central atom is located as far as possible relative to the others.

The electron, a subatomic particle, has a negative one elementary charge electric charge.. The first generation lepton particle, the electron, is usually regarded as an elementary particle because it has no known components or substructure. The subatomic electron can exist either free or attached to an atom.

The number of electron pairs surrounding an individual molecule's core atoms can be used to forecast a molecule's shape using the chemical model known as the VSEPR. The valence electron pairs that surround an atom have a tendency to oppose one another, thus they will arrange themselves in a way that minimises this repulsion, according to the premise of VSEPR.

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