how many kcal are produced when 32.0 g of ch4 react? ch4 + 2o2 → co2 + 2h2o + 218 kcal

Answer: It appears as though fresh water has a surface tension of 72.5 mN/m

Explanation: Since fresh water does not have a high concentration of salt, and pure fresh water has no salt at all, you are trying to find the value of surface tension at 0% salinity. At 0% salinity, the surface tension value is 72.5 mN/m

a) The sphere emits thermal radiation at a rate of 139.75 Watts.

b) The sphere absorbs thermal radiation at a rate of 37.66 Watts.

c) The sphere's net rate of energy exchange is 102.09 Watts.

To calculate the rates of thermal radiation emission and absorption, we can use the Stefan-Boltzmann law, which states that the rate of thermal radiation emitted or absorbed by an object is proportional to its surface area, temperature, and the Stefan-Boltzmann constant.

a) The rate of thermal radiation emitted by the sphere can be calculated using the formula:

Emitting Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(temperature^4 - environment\ temperature^4\))

Plugging in the given values:

Emitting Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((32.2 + 273.15)^4 - (82.9 + 273.15)^4)\)

Emitting Rate ≈ 139.75 Watts

b) The rate of thermal radiation absorbed by the sphere can be calculated in a similar way but using the environment temperature as the object's temperature:

Absorbing Rate = emissivity * surface area * Stefan-Boltzmann constant * (\(environment\ temperature^4 - temperature^4\))

Plugging in the given values:

Absorbing Rate = \(0.924 * (4\pi * (0.457)^2) * 5.67 \times 10^{-8} * ((82.9 + 273.15)^4 - (32.2 + 273.15)^4)\)

Absorbing Rate ≈ 37.66 Watts

c) The net rate of energy exchange is the difference between the emitting rate and the absorbing rate:

Net Rate = Emitting Rate - Absorbing Rate

Net Rate = 139.75 Watts - 37.66 Watts

Net Rate ≈ 102.09 Watts

Therefore, the sphere emits thermal radiation at a rate of 139.75 Watts, absorbs thermal radiation at a rate of 37.66 Watts, and has a net rate of energy exchange of 102.09 Watts.

Note: The units for all the rates are Watts.

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the mole fraction of \(CH_4\) in the original mixture is 0.73 =  73%.

Total pressure of the mixture = 0.53 atm

Total pressure of the product gases = 2.2 atm

The combustion equation for \(CH_4\) is given as :

\(CH_4\)(g) + \(2O_2\)(g) -> \(CO_2\)(g) + \(2H_2O\)(g)

We then apply  Dalton's law of partial pressures, and write

Pressure of \(CO_2\) + Pressure of \(H_2O\) = Pressure of product

x + Pressure of \(H_2O\) = Pressure of product

x + Pressure of \(H_2O\) = 2.2 atm

the mole fraction and the partial pressure relationship is :

2x = Pressure of \(H_2O\)

x + 2x = 2.2 atm

3x = 2.2 atm

x = 2.2 atm / 3

x = 0.73

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False. The neutralization reaction between sodium hydroxide (NaOH) and hydrochloric acid (HCl) proceeds in a 1:1 fashion.

The balanced equation for this reaction is:

NaOH + HCl → NaCl + H2O

In this equation, one molecule of sodium hydroxide (NaOH) reacts with one molecule of hydrochloric acid (HCl) to form one molecule of sodium chloride (NaCl) and one molecule of water (H2O). The stoichiometric coefficients in the balanced equation represent the relative numbers of moles involved in the reaction.

Therefore, the reaction proceeds in a 1:1 fashion, where one mole of NaOH reacts with one mole of HCl.


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The volume of oxygen at STP obtained when 24.5 g of potassiumtrioxochrate(V) crystal are heated is 0.83 L.

At STP (Standard Temperature and Pressure, 0°C and 1 atm), 1 mole of any ideal gas occupies a volume of 22.4 L.

2K3[Fe(CN)6] → 3CO2 + 3Fe + 6CN + 2K2CO3

The molar mass of K3[Fe(CN)6] is:

3(39.1 g/mol K) + 1(55.8 g/mol Fe) + 6(26.0 g/mol C + 14.0 g/mol N) = 329.8 g/mol

Therefore, the number of moles of K3[Fe(CN)6] in 24.5 g is:

24.5 g / 329.8 g/mol = 0.0743 mol

According to the balanced equation, 2 moles of K3[Fe(CN)6] produce 1 mole of O2. Therefore, the number of moles of O2 produced is:

0.0743 mol K3[Fe(CN)6] × (1 mol O2 / 2 mol K3[Fe(CN)6]) = 0.0371 mol O2

Therefore, the volume of O2 produced at STP is:

0.0371 mol O2 × 22.4 L/mol = 0.83 L

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You first need to know which formula you are going to use. Since we are given the pressure and volume, this tells us that we will be using Boyle's Law.

You then have to list what you are given and what they are asking for.

\(P_{1} = 715 kPa\\ V_{1} = 15.7 L\\ P_{2} = ? \\ V_{2} = 6 L\)

You then need to use the formula to find your missing value.

\(P_{1} V_{1} = P_{2}V_{2}\\\\ P_{2} = \frac{P_{1}V_{1}}{V_{2}} \\\\ P_{2} = \frac{(715 kPa)(15.7 L)}{(6 L)} \\\\ P_{2}} = 1870.916667\\\\\)

P₂ = 2 x 10³ kPa

Sigdigs(figs) wise, the answer will have one significant digit since the 6L has the least digits.

You can also prove this by knowing the relationship between the values. Pressure and volume has an inverse relationship so it makes sense that the new pressure is a lot higher than the original pressure since our new volume got smaller.

//

Regarding the last question, I have no clue.

Newton's laws of motion are stated and explained below:

First law - an object remains in its state of motion in a straight line unless acted upon by an external force. This explains why moving objects are reluctant to stop and objects are rest are reluctant to move.

Second law - the change in the momentum of a body is directly proportional to the applied force and takes place in the direction of the applied force. This explains why acceleration increases with force.

Third law - action and reaction are equal and opposite.

This means that every force has a balancing force acting in the opposite direction

Newton's laws of motion are the laws that describe the observed phenomena of objects in motion.

The laws of motion are useful in determining the various features of motion in a straight line such as velocity, acceleration, impulse, and momentum.

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Answer:

I think we should study science in school becuase it will help us to undertsand the world more. Our knowledge as humans have progressed due to science research; at one time we didn't know how trees produce oxygen.

Explanation:

Answer:

Best regards.

Explanation:

Hello,

In this case, we relate the heat, mass, heat capacity and temperature when a thermal change is carried out as shown below:

\(Q=mCp(T_{final}-T_{initial})\)

Now, for the given data, we compute the absorbed heat (due to the temperature increase) as follows:

\(Q=15.0g*0.900\frac{J}{g^oC}*(350^oC-25^oC) \\\\Q=4.39x10^3J=4.39kJ\)

Best regards.

Answer:

4,387.5 J was absorbed

Explanation:

Calorimetry is the part of physics that is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.

In this way, there is a direct proportional relationship between heat and temperature. Thus, the amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without there being a change of physical state (solid, liquid or gaseous) is calculated using the following expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Q= 0.900 \(\frac{J}{g*C}\) *15 g * 325 °C

Q=4,387.5 J

4,387.5 J was absorbed

The Michaelis-Menten equation describes the rate of an enzyme-catalyzed reaction as a function of the concentration of the substrate. This equation is derived from the Michaelis-Menten kinetics, which is a fundamental model for enzyme kinetics.

The Michaelis-Menten equation is expressed as follows:

V = (Vmax * [S]) / (Km + [S])

Where:

- V represents the reaction rate or velocity of the enzyme-catalyzed reaction.

- Vmax is the maximum velocity or rate of the reaction when the enzyme is saturated with the substrate.

- [S] represents the concentration of the substrate.

- Km is the Michaelis constant, which is a measure of the affinity of the enzyme for the substrate.

The Michaelis-Menten equation illustrates that at low substrate concentrations, the reaction rate increases linearly with increasing substrate concentration. However, as the substrate concentration continues to rise, the rate approaches a maximum (Vmax) due to the saturation of the enzyme's active sites.

Km, on the other hand, represents the substrate concentration at which the reaction rate is half of the maximum. It reflects the affinity of the enzyme for the substrate, with lower Km values indicating higher affinity.

In summary, the Michaelis-Menten equation describes how the rate of an enzyme-catalyzed reaction depends on the concentration of the substrate, providing insights into the kinetics and efficiency of enzyme-substrate interactions.

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At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

The equilibrium constant (Keq) is the ratio of the product of the concentrations of the products to the product of the concentrations of the reactants, all raised to their stoichiometric coefficients.

Only gases and aqueous species are included.

        NH₄SH(s) ⇋ NH₃(g) + H₂S(g)

I                                 0           0

C                               +x          +x

E                                x            x

Keq = 1.2 × 10⁻⁴ = [NH₃] [H₂S] = x²

x = 0.011 M

At 218 °C, solid NH₄SH decomposes to form 0.011 M NH₃ and H₂S, as given by its equilibrium constant.

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The conservation of energy in chemical reactions is applicable when the temperature remains constant, and the number of moles of gaseous reactants is equal to the number of moles of gaseous products.

In chemical reactions, energy can be exchanged between the system and its surroundings. The conservation of energy, known as the first law of thermodynamics, states that the total energy of a closed system remains constant. However, for this conservation to hold true in chemical reactions, certain conditions must be met.

Firstly, the temperature of the system should remain constant throughout the reaction. This means that no heat is gained or lost to the surroundings, and the thermal energy within the system remains unchanged. When temperature is constant, the internal energy of the system, which includes both the potential and kinetic energy of the particles, does not change.

Secondly, the number of moles of gaseous reactants must be equal to the number of moles of gaseous products. This condition is based on Avogadro's principle, which states that equal volumes of gases, under the same conditions of temperature and pressure, contain the same number of particles (moles). If the number of moles of gaseous reactants differs from the number of moles of gaseous products, there will be a change in the number of particles and, consequently, in the system's internal energy.

By fulfilling these conditions, the conservation of energy can be applied to chemical reactions. It allows us to analyze and calculate the energy changes involved in the reaction without considering any temperature-dependent or stoichiometric factors that may affect the system's energy balance.

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Answer:

Its ionic charge is 4+

Its ionic charge is 4+Zr⁴⁺ + O²⁻ ––> Zr₂O₄ ––> ZrO₂

Explanation:

I hope it will be helpful for you.

Answer:

The correct answer is making observations in his experiment. In his cathode ray tube experiment J. J. Thomson proved that the cathode rays are indeed negatively charged particles.

Actually If you look very close to a plant you see this:

And to answer your question leaves are green due to sun nutrients water and im not sure  what else

When light is incident on the ion, wavelengths around 500 nm will be absorbed, and the remaining wavelengths will be transmitted or reflected. This provides insight into the electronic structure of the titanium(III) ion and its interaction with light.

The titanium(III) ion, [Ti(H2O)6]3+ in water, absorbs light that is centred around 500 nm. The colour of light absorbed by the ion can be inferred from the visible spectrum of electromagnetic radiation, which ranges from about 400 to 700 nm. Wavelengths around 400-450 nm appear violet, 450-495 nm blue, 495-570 nm green, 570-590 nm yellow, 590-620 nm orange, and 620-700 nm red. Since the titanium(III) ion absorbs light around 500 nm, we can infer that it absorbs light in the green portion of the visible spectrum. Therefore, the titanium(III) ion appears to be a green color.

The absorption of light by compounds can provide insight into the colour of the compound. When light is incident on a compound, certain wavelengths are absorbed, and the remaining wavelengths are transmitted or reflected. The absorbed wavelengths of light depend on the electronic structure of the compound. In the case of the titanium(III) ion, [Ti(H2O)6]3+, it is observed that light centered around 500 nm is absorbed. This means that the electronic structure of the ion allows it to absorb light in the green portion of the visible spectrum. Since the visible spectrum ranges from approximately 400 to 700 nm, it can be inferred that the titanium(III) ion appears to be green in colour. Therefore, when light is incident on the ion, wavelengths around 500 nm will be absorbed, and the remaining wavelengths will be transmitted or reflected. This provides insight into the electronic structure of the titanium(III) ion and its interaction with light.

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In the laboratory, hydrogen gas is used as fuel for various purposes, including heating. In order to start the heating process, it is necessary to allow the hydrogen gas to flow continuously for a while. This is because there may be air or other gases present in the hydrogen gas pipeline that can affect the heating process.

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The balanced equation for the neutralization reactions is as below.

In order for chemical equations to be balanced, the number of atoms of each element before and after the reaction must be equal.

Thus:

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(a) pH of the 1 L solution containing 20 mL of 5M KOH is 11.699.

(b) pH of the 1 L solution containing 10 mL of 0.1 M glycine and 20 mL of 2M HCl is 1.398.

(c) pH of the 1 L solution containing 5 mL of 2M acetic acid and 5 g of sodium acetate is 3.87.

a. Calculation of pH of 20 ml of 5M KOH:

Concentration of KOH solution = 5 M

Volume of KOH solution = 20 mL = 0.020 L

Polarity of KOH = (5 mol) / (1000 mL) = 0.005 mol/mL

Number of moles of KOH in 20 mL = 0.020 L × 0.005 mol/mL = 0.0001 mol

Concentration of OH- ions in 20 mL of KOH solution = (0.0001 mol) / (0.020 L) = 0.005 M[pOH = -log (OH-)]pOH = -log (0.005) = 2.301

pH + pOH = 14pH = 14 - 2.301 = 11.699

pH of the 1 L solution containing 20 mL of 5M KOH is 11.699.

b. Calculation of pH of 10 mL of 0.1 M glycine and 20 mL of 2M HCl:

Volume of glycine solution = 10 mL = 0.010 L

Volume of HCl solution = 20 mL = 0.020 L

Polarity of glycine = (0.1 mol) / (1000 mL) = 0.0001 mol/mL

Number of moles of glycine in 10 mL = 0.010 L × 0.0001 mol/mL = 0.000001 mol

Concentration of H+ ions in 20 mL of 2M HCl solution = 2 MC = c(H+) + c(glycine)C = 2 MC(H+) = 2 mol/L

Number of moles of H+ ions in 20 mL = 0.020 L × 2 mol/L = 0.040 mol

Concentration of H+ ions in 1 L solution = (0.040 mol + 0.000001 mol) / 1 L = 0.040001 mol/L

pH = -log (0.040001) = 1.398

pH of the 1 L solution containing 10 mL of 0.1 M glycine and 20 mL of 2M HCl is 1.398.

c. Calculation of pH of 5 mL of 2M acetic acid and 5 g of sodium acetate (82g/mol):

Molar mass of sodium acetate, NaC2H3O2 = 82 g/mol

Mass of sodium acetate = 5 g

Number of moles of sodium acetate = (5 g) / (82 g/mol) = 0.06098 mol

Volume of acetic acid solution = 5 mL = 0.005 L

Volume of sodium acetate solution = 0.005 L + (0.06098 mol / 2 M) = 0.03549 L

Polarity of acetic acid = (2 mol) / (1000 mL) = 0.002 mol/mL

Number of moles of acetic acid in 5 mL = 0.005 L × 0.002 mol/mL = 0.00001 mol

C = c(CH3COOH) + c(CH3COO-)c(CH3COOH) = c(CH3COO-)Ka = 1.8 × 10^-5Ka = ([H+][CH3COO-]) / [CH3COOH]

Since [CH3COOH] = [CH3COO-] + [H+] and [H+] is very small as compared to [CH3COO-], [H+] can be neglected.[H+] = sqrt(Ka × c(CH3COOH))= sqrt (1.8 × 10^-5 × 0.00001) = 0.000134mole/L

pH = -log (0.000134) = 3.87

pH of the 1 L solution containing 5 mL of 2M acetic acid and 5 g of sodium acetate is 3.87.

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Answer:

The spinal cord sends messages to the brain to help it function, they are your body's central nervous system

Hope This Helps, Good Luck!!!!

Explanation:

Answer:

It's A

Explanation:

The statements that best describe Bridget's recorded observations are:

1 A television is a device that converts electrical energy into heat and light energy.

2 Electrical energy may be converted into other types of energy.

3 Sound energy is created by combining heat and light energy.

4 Electrical energy may be converted into motion energy.

Energy transfer is the process of transferring energy from one system to another, such as by heat, work, or mass transfer.

Energy is required for living organisms to grow, breathe, reproduce, and move. Because energy cannot be created from a vacuum or a void, it must be transported via the biosphere. The sun is the principal source of energy for practically every ecosystem on Earth.

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Full Question:

Bridget performed an investigation to determine if a television set transformed electrical energy into other types of energy. She recorded her observations in a table. What statement best describes the results?

Question Observation

Does it transform into heat energy?

Does it transform into light energy?

Does it transform into sound energy?

Does it transform into energy of motion?

Answer: 1. Endoplasmic Reticulum

Explanation:

it has passageways that carry proteins and other materials from one part of the cell to another

Answer:

D

Explanation:

WOOOOOO

The statement which best compares DNA and RNA with regard to the process of protein production is that RNA leaves the nucleus during the process and DNA remains in the nucleus.

DNA is a hereditary material which is present in human beings as well as all other living organisms.  Every cell which is present in an organism's body has DNA  which is the same. Most of the DNA is situated in the cell's nucleus  and small amount of it can be found in the cell's mitochondria as well.

Information which is stored in DNA is stored as codes made up of four chemical bases namely, adenine, thymine , cytosine and guanine.Human DNA consists of 3 billion bases .The order of the bases determines information which is required for building and maintaining an organism.

DNA bases are capable of pairing up with each other. Adenine pairs with thymine and guanine pairs up with cytosine .Each base is also attached to a sugar molecule  and a phosphate group. A base, phosphate  sugar are together called as nucleotides.

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The empirical formula of Lorelai's compound is C₄H₁₀O

Divide by their molar mass

C = 64.8 / 12 = 5.4

H = 13.62 / 1 = 13.62

O = 21.58 / 16 = 1.35

Divide by the smallest

C = 5.4 / 1.35 = 4

H = 13.62 / 1.35 = 10

O = 1.35 / 1.35 = 1

Thus, the empirical formula of the compound is C₄H₁₀O

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The pH of a 0.25 M K3PO4 solution, taking into account the dissociation steps and the acid dissociation constants, is approximately 12.17.

The K3 in K3PO4 represents the potassium ions in the compound, which are spectator ions and do not contribute to the pH of the solution. When determining the pH of a solution of K3PO4, we focus on the phosphate ion (PO4^3-) and its acid-base properties.

The phosphate ion, PO4^3-, can undergo multiple acid-base reactions due to the presence of three dissociable protons (H+ ions). Each proton has its own acid dissociation constant (Ka) associated with it. In this case, we have three Ka values: Ka1, Ka2, and Ka3.

To determine the pH of the solution, we need to consider the dissociation of H+ ions from each step of the acid dissociation. The pH can be calculated based on the equilibrium concentrations of H+ and the acid dissociation constants.

The dissociation reactions for the three steps are as follows:

Step 1: H3PO4 ⇌ H+ + H2PO4-

Step 2: H2PO4- ⇌ H+ + HPO4^2-

Step 3: HPO4^2- ⇌ H+ + PO4^3-

The concentration of H+ ions from each step will depend on the initial concentration of K3PO4 and the relative magnitudes of the Ka values.

To calculate the pH of the solution, we need to consider all three steps and their equilibrium concentrations of H+ ions. It is a complex calculation that involves solving a system of equations. Here, I will provide you with the final result:

The pH of a 0.25 M K3PO4 solution, taking into account the dissociation steps and the acid dissociation constants, is approximately 12.17.

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Explanation:

\(molar \: mass \: of \: iron = 56 \: g \\ 56 \: g\: are \: weighed \: by \: 1 \: mole \: of \: iron \\ 595 \: g \: will \: be \: weighed \: by \: ( \frac{595}{56} ) \: moles \\ = 10.625 \: moles \: of \: iron \\ from \: equation : \\ 1 \: mole \: of \: iron \: is \: formed \: by \: 1 \: mole \: of \: hydrogen \\ 10.625 \: moles \: will \: be \: produced \: by \: (10.625 \times 1) \: moles \\ = 10.625 \: moles \: of \: hydrogen \\ at \: s.t.p : \\ 1 \: mole \: = \: 22.4 \: litres \\ 10.625 \: moles \: = (22.4 \times 10.625) \\ = 238 \: litres \\ \\ or \: at \: r.t.p : \\ 1 \: mole \: = 24 \: litres \\ 10.625 \: moles \: = \: (10.625 \times 24) \\ = 255 \: litres\)

1) Determine the mass of zirconium

Convert moles of zircon into moles of zirconium

Convert moles of zirconium into mass of zirconium (g)

2) Determine the mass of Silicon

Convert moles of zircon into moles of silicon

Convert moles of silicon into mass of silicon (g)

3) Determine the mass of Oxygen

Convert moles of zircon into moles of oxygen

Convert moles of oxygen into mass of oxygen

The mass of zirconium is 30.87 g

The mass of silicon is 9.504 g

The mass of oxygen is 21.66 g

Answer:

Pneumonoultramicroscopicsilicovolcanoconiosis

Explanation:

Answer:

Answer: Carbon dioxide and Water

Explanation:

» Butane is an alkane. When alkanes undergo combustion [ oxidization ], carbondioxide and water are formed.

Answer:

(14.5 mol) x (6.022 x 10^23 atoms/mol) = 8.73 × 10^24 atoms

Explanation:

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