cyclohexanol has a vapor pressure of 10.0 mmhg at 56.0 °c, and 100.0 mmhg at 103.7 °c. calculate its enthalpy of vaporization, δvaph. give you answer in kj/mol.

Explanation:

Bacteria play a key role in the nitrogen cycle.

Nitrogen-fixing microorganisms capture atmospheric nitrogen by converting it to ammonia— NH3start text, N, H, end text, start subscript, 3, end subscript—which can be taken up by plants and used to make organic molecules.

The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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Answer:

54

Explanation:

Given an atom of Tellurium;

         Tellurium has an atomic number of 52;

Unknown:

The number of electrons in a -2 anion

Solution:

   The atom is;

                            Te²⁻

A neutral tellurium atom has 52 electrons

When it forms an anion, it becomes negatively charged;

   This implies that the number of electrons becomes more,

  So, the number of electrons  = 52 + 2 = 54

So, the electrons are 54  

Answer:

54

Explanation:

Tellurium has an atomic number of 52, which means the neutral Te has 52 protons and 52 electrons. Te is -2 anion when it acquires 2 extra electrons so 52 + 2 = 54

Answer:

Force required = 600 N

What is Work?

Work is the energy transferred to or from an object via the application of force along a displacement or distance.

Work is calculated as the product of the force strength and the distance travelled. i.e, W = Fd.

∴ W = Fd

3600 = F×6

F = 600 N

The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.

The mass of a substance in a calorimetry procedure can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:

4000 = m × 4.184 × 10

4000 = 41.84m

m = 95.6g

Therefore, 95.6 grams is the mass of the water sample.

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The inner core is solid, fourth layer and made out of iron and nickel. It's the one mostly in charge for the other layers. If the inner core stopped spinning, the outer core would lose its magnetic field, and this will be bad because of the sun's radiation wave. Including the other layers.

The outer core is the liquid, third layer. It's in charge of Earth's magnetic field.

The mantle is the second layer of earth, the original temperature can come up about to 1000+ or more, celsius.

Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepare. Na₂HAsO₄ and Na₂SO₄ is the correct option.

The maximum amount of a chemical that will dissolve in a given amount of solvent at a given temperature is referred to as its solubility. Varying compounds have very different solubilities, which is a characteristic of a particular solute-solvent pair. The amount of a solute that dissolves in a specific volume of liquid is known as its solubility.

In terms of solubility, solute volume divided by solvent volume o

Saturated, unsaturated, and extremely saturated solutions are all possible.

The solubility of solutes increases as the temperature rises.

Depending on the solubility at the temperature, 600 mL of saturated solution in NaCl must be prepared.

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Answer:

C

Explanation:

Na2HAsO4 and Na2SO4

Answer: its millimeters

Explanation: we use millimeters foe liquids like water for example

The missing question is:

What is the percent efficiency of the laser in converting electrical power to light?

The percent efficiency of the laser that consumes 130.0 Watt of electrical power and produces a stream of 2.67 × 10¹⁹ 1017 nm photons per second, is 1.34%.

A particular laser consumes 130.0 Watt (P) of electrical power. The energy input (Ei) in 1 second (t) is:

\(Ei = P \times t = 130.0 J/s \times 1 s = 130.0 J\)

The laser produced photons with a wavelength (λ) of 1017 nm. We can calculate the energy (E) of each photon using the Planck-Einstein's relation.

\(E = \frac{h \times c }{\lambda }\)

where,

\(E = \frac{h \times c }{\lambda } = \frac{6.63 \times 10^{-34}J.s \times 3.00 \times 10^{8} m/s }{1017 \times 10^{-9} m }= 6.52 \times 10^{-20} J\)

The energy of 1 photon is 6.52 × 10⁻²⁰ J. The energy of 2.67 × 10¹⁹ photons (Energy output = Eo) is:

\(\frac{6.52 \times 10^{-20} J}{photon} \times 2.67 \times 10^{19} photon = 1.74 J\)

The percent efficiency of the laser is the ratio of the energy output to the energy input, times 100.

\(Ef = \frac{Eo}{Ei} \times 100\% = \frac{1.74J}{130.0J} \times 100\% = 1.34\%\)

The percent efficiency of the laser that consumes 130.0 Watt of electrical power and produces a stream of 2.67 × 10¹⁹ 1017 nm photons per second, is 1.34%.

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After the water vapor condenses, the pressure of carbon dioxide will be 1.5 atm.

To find the pressure of the carbon dioxide after the water vapor condenses, we can use the idea of partial pressures. The total pressure of the vessel is 2.00 atm, and the ratio of moles of CO2 to moles of water vapor is 3:1. Therefore, the partial pressure of the CO2 is 3/4 of the total pressure, and the partial pressure of the water vapor is 1/4 of the total pressure.

So,

P(CO2) = (3/4) * 2.00 atm = 3/4* 2 atm = 1.5 atm

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Perceived susceptibility, perceived severity, perceived benefits, perceived barriers, cues, and confidence are constructs of the Health Belief Model (HBM).

HBM is a theoretical framework that explains individuals' health behaviors by assessing their perceived threat of a health problem and their perceived effectiveness of the recommended health behavior. Perceived susceptibility and severity relate to an individual's belief about the likelihood and seriousness of a health problem. Perceived benefits and barriers relate to the perceived positive and negative aspects of engaging in a particular health behavior.

Cues are external triggers that encourage an individual to engage in a health behavior, while confidence relates to an individual's belief in their ability to perform the recommended health behavior. Together, these constructs help to predict and understand individuals' health behaviors.

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Taking into account the direction the meter points will be from left to right, the copper (||) ions are being reduced and Zn is being oxidized in the zinc and copper galvanic cell.

The direction of the flow of elections will be indicated by the direction of the needle, which will move from left to right. At this point, oxidation takes place at the Zn electrode, resulting in the release of e-, whilst the reduction of Cu+2 ion takes place at the Cu electrode, leading to the movement of electrons from left to right.

The correct answer is that the copper (||) ions are being reduced while the zinc ions are being oxidized.

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Option E) In the reaction A+ 2B-C that is found to be first order with respect to both a (0.200 m concentration and b (0.400 m concentration) the numeric value of k is 0.0875

Concentration in chemistry terms is calculated by dividing a constituent's abundance by the mixture's present total volume.

Mass concentration, molar concentration, number concentration, and volume concentration are four different categories that can be described in a mathematical description.

A + 2B → C

Rate = K [A] [B]

Here,

[A] = 0.2 M [B]

⇒ [A] = 0.4 M

rate = 0.007 M/s

Therefore, rate = K [A] [B]

⇒ 0.007 = K (0.2) (0.4)

⇒ K = 0.0875 M^(-1) S^(-1)

Thus, option E is correct.

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Complete question

The reaction A+ 2B-C is found to be first order with respect to both A and B. When the concentration of A is 0.200 M and the concentration of B is 0.400 M, the reaction rate is 0.00700 M/s. What is the numerical value of k for this reaction (with appropriate units where time is in seconds and concentration is in M, as needed).

A) 0.0438

B) 0.0140

C) 11.4

D) 5.60 x 10^(-4)

E) 0.0875

2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

The energy required in a calorimetry can be calculated using the following formula:

Q = m × c × ∆T

Where;

According to this question, 4.37 g of silver should be heated from 25°C to 27.5°C. The heat required is as follows:

Q = 4.37 × 0.24 × (27.5 - 25)

Q = 1.0488 × 2.5

Q = 2.62J

Therefore, 2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

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Answer:

C. both particle and a wave

Answer: C. Both a Particle and a Wave

Explanation:

Light can travel as particles or like waves. We can see it traveling like particles when a firefly glows. That is still a version of light. It travels as a wave when you turn on your light, faster than sound can. These are the two versions of light, particle and wave. The answer is C. Both a Particle and a Wave

Answer:

the 4th one

Explanation:

2NACL 2NA + CL2

Answer:

It's B, the previous answer is wrong

Explanation:

Answer:

1.818x10²³ particles

Explanation:

Add the two atomic masses given to get 74.55 g.

Divide the number of grams given by the molar mass of KCl:

22.5g ÷ 74.55 = 0.302 mol

Multiply the moles by 6.022×10²³ particles

from google, so I think the answer to that question is the second one

Answer:

Hess’s Law describes how the __Heat__ energy of a reaction consists of the _Enthalpy__ of the energy changes of the individual step reactions

Explanation:

Hess law is a legendary law which is given by

\(\\ \rm\Rrightarrow ∆H_{net}=\sum \delta H_r\)

When the chair-flip of cyclohexane is performed, all the axial groups take the position of equatorial and all the equatorial groups take the position of axial.  

In organic chemistry, a ring flip or chair flip can be described as the interconversion of cyclic conformers that have equivalent ring shapes that result in the exchange of nonequivalent substituent positions.

The overall process occurs over several steps, involving coupled rotations of the molecule's single bonds. This term is used for the interconversion of the two chair conformers of cyclohexane derivatives, which is referred to as a chair flip.

All axial positions during the chair flip become equatorial and all equatorial positions take axial positions. Substituents in equatorial positions follow along the equator of the cyclohexane and are perpendicular to the axis.

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When 1.00 kcal of heat is applied, the water sample's final temperature is T = 50.0°C + 40.0°C = 90.0°C.

The amount of energy required to raise a substance's temperature is measured in terms of specific heat. It is the amount of energy (measured in joules) required to increase a substance's temperature by one degree Celsius per gram.

We must first determine the water sample's original temperature. The formula is as follows:

Q = mcΔT

Inputting the values provided yields:

700.00 cal = 25.0 g x 1.00 cal/g °C x (50°C - 22.0°C)

When we simplify this equation, we obtain:

ΔT = 700.00 cal / (25.0 g x 1.00 cal/g °C) = 28.0°C

Therefore, the initial temperature of the water sample is 22.0°C + 28.0°C = 50.0°C.

Inputting the values provided yields:

1.00 kcal = 25.0 g x 1.00 cal/g °C x (T - 50.0°C)

When we simplify this equation, we obtain:

T - 50.0°C = 1.00 kcal / (25.0 g x 1.00 cal/g °C) = 40.0°C

Therefore, When 1.00 kcal of heat is applied, the water sample's final temperature is T = 50.0°C + 40.0°C = 90.0°C.

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Explanation:

To calculate the concentration of carbon dioxide in water in mol/L, we first need to determine the number of moles of carbon dioxide present in the given mass (0.145 g) at a given temperature and pressure.

The molar mass of CO2 is 44 g/mol, so the number of moles of CO2 in the 0.145 g sample is:

0.145 g CO2 / 44 g/mol CO2 = 0.003295 mol CO2

To convert to mol/L (or mol/dm^3), we divide the number of moles of CO2 by the volume of water present in the solution. Since the density of water at 25°C is close to 1 g/cm^3, we can assume that the volume of water present in the solution is 100 cm^3. Therefore, the concentration of CO2 in mol/L is:

0.003295 mol CO2 / 0.1 L = 0.03295 mol/L

Answer:

200Joules

Explanation:

W=Fd                                                                                                                                         W=10×20                                                                                                                             W=200J

Answer:

they are bacteria

Explanation:

Answer:

Good bacteria keeps you healthy by supporting your immune function and controlling inflammation. Certain types of good bacteria can also: Help your body digest food. Keep bad bacteria from getting out of control and making you sick.

Explanation:

I hope this helps and pls mark me brainliest :)

2..5 grams of platinum will be there at the end of the reaction, because Platinum is the catalyst here.

Catalyst is a substance that can be added to a chemical reaction to increase the rate of reaction without getting itself consumed in the reaction. It just acts as a driving force for the reaction and it itself does not take part in the chemical reaction.

Catalysts basically speeds up a reaction by reducing the activation energy or also by changing the reaction mechanism. Enzymes are proteins that act as catalysts in the biological systems.

In the above given question if 2.5 grams of platinum is added to the reaction vessel then at the end of the reaction 2.5 grams of platinum itself will be remaining because it acts as a catalyst here.

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Answer:

B

Explanation:

The main aim of lab rules is to minimize the no of accidents

4.33 grams of nitrogen are produced when 7.80 grams of dinitrogen tetrahydride reacts with hydrogen peroxide.

To determine the mass of nitrogen (N2) produced when 7.80 grams of dinitrogen tetrahydride (NaH) reacts with hydrogen peroxide (H2O2), we need to calculate the stoichiometry of the balanced chemical equation and use the molar masses of the compounds involved.

The balanced chemical equation is:

2NaH + 2H2O2 → N2 + 4H2O

From the equation, we can see that 2 moles of NaH react with 2 moles of H2O2 to produce 1 mole of N2. To find the molar mass of N2, we add the atomic masses of two nitrogen atoms:

Molar mass of N2 = 2 × Atomic mass of nitrogen = 2 × 14.01 g/mol = 28.02 g/mol

Now, let's calculate the number of moles of NaH:

Moles of NaH = Mass of NaH / Molar mass of NaH

Moles of NaH = 7.80 g / (22.99 g/mol + 1.01 g/mol) ≈ 0.3088 mol

According to the balanced equation, the molar ratio of NaH to N2 is 2:1. Therefore, the moles of N2 produced will be half the moles of NaH used:

Moles of N2 = 0.3088 mol / 2 ≈ 0.1544 mol

Finally, to find the mass of nitrogen produced, we multiply the moles of N2 by the molar mass of N2:

Mass of N2 = Moles of N2 × Molar mass of N2

Mass of N2 = 0.1544 mol × 28.02 g/mol ≈ 4.33 g

Therefore, approximately 4.33 grams of nitrogen are produced when 7.80 grams of dinitrogen tetrahydride reacts with hydrogen peroxide.

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If a temperature increase from 12. 0 °C to 20. 0 °C doubles the rate constant for a reaction. What is the value of the activation barrier for the reaction is 60.155KJ/mol.

Activation energy is defined as the minimum amount of energy required by molecules to occur a chemical reaction. It is denoted by Ea.

Given,

T1 = 12+273 = 285K

T2 = 20 +273 = 293K

Rate constant = k2/k1 = 2:1

Using arrhenius equation which give relationship between constant of reaction and temperature is

In(k2/k1) = Ea/(R[1/T1 - 1/T2]

where, Ea is the activation energy

and R is the gas constant

T1 is the initial temperature

T2 is the final temperature

In2= Ea/R[(1/285) - (1/293)]

Ea = In2 × 8.314 ×285×293/8

Ea = 0.301 ×8.314 ×285×293/8

Ea = 60155J/mol

Ea = 60.155KJ/mol.

Thus we calculated that the activation energy for a reaction at 12°C to 20°C is 60.155KJ/mol.

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To find the molarity of a solution, you need to know the number of moles of solute (NaOH) and the volume of the solution.

First, you need to calculate the number of moles of NaOH:

Molar mass of NaOH = 22.99 g/mol (Na) + 16.00 g/mol (O) + 1.01 g/mol (H) = 39.99 g/mol

Number of moles of NaOH = mass of NaOH / molar mass of NaOH

= 80 g / 39.99 g/mol

= 2.001 mol (rounded to three decimal places)

Next, calculate the molarity of the solution:

Molarity (M) = moles of solute / volume of solution (in liters)

= 2.001 mol / 4.0 L

= 0.50025 M (rounded to five decimal places)

Therefore, the molarity of the solution is approximately 0.50025 M.

Answer:

0.50 M

Explanation:

The first step is to calculate the number of moles of NaOH in the solution using the formula:

\(\boxed{\bold{moles = \frac{mass}{molar \:mass}}}\)

The molar mass of NaOH is 40.00 g/mol (sodium: 22.99 g/mol, oxygen: 15.99 g/mol, hydrogen: 1.01 g/mol). So, the number of moles of NaOH in the solution is:

moles =\(\bold{ \frac{80 g}{40.00 g/mol }}\)= 2.00 mol

The next step is to calculate the molarity of the solution using the formula:

\(\boxed{\bold{molarity = \frac{moles\: of \:solute}{volume \:of\: solution \:in\: liters}}}\)

In this case, the moles of solute (NaOH) is 2.00 mol and the volume of solution is 4.0 liters. So, the molarity of the solution is:

molarity = \(\frac{2.00 mol}{4.0 L }\)= 0.50 M

Therefore, the molarity of the solution that contains 80 g of NaOH in 4.0 liters of solution is 0.50 M.