The separation of benzene (B) from cyclohexane (C) by distillation at 1 atm is impossible because of a minimum-boiling-point azeotrope at 54. 5 mol% benzene. However, extractive distillation with furfural is feasible. For an equimolar feed, cyclohexane and benzene products of 98 and 99 mol%, respectively, can be produced. Alternatively, the use of a three-stage pervaporation process, with selectivity for benzene using a polyethylene membrane, has received attention, as discussed by Rautenbach and Albrecht [47]. Consider the second stage of this process, where the feed is 9,905 kg/h of 57. 5 wt% B at 75C. The retentate is 16. 4 wt% benzene at 67. 5C and the permeate is 88. 2 wt% benzene at 27. 5C. The total permeate mass flux is 1. 43 kg/m2-h and selectivity for benzene is 8. Calculate flow rates of retentate and permeate in kg/h and membrane surface area in m2

Answer:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Explanation:

The systematic name for the given formula Co(NH3)4(NO2)2IC is tetraamines(nitrator-N)cobalt(III) iodide.

Sure! Let's break down the systematic name for the given formula Co(NH3)4(NO2)2IC:

- The central metal atom is cobalt (Co).

- The ligands attached to the cobalt atom are tetraammine (NH3) and bis(nitrator-N) (NO2).

- "Tetraamine" indicates that there are four ammonia (NH3) ligands bound to the cobalt atom.

- "Bis(nitrator-N)" indicates that there are two nitrite (NO2) ligands, where each nitrite is coordinated to the cobalt atom through the nitrogen atom (nitrator-N).

Lastly, the compound is identified as iodide (IC), indicating that there is an iodide ion (I-) associated with the cobalt complex.

Therefore, the systematic name for the given formula Co(NH3)4(NO2)2IC is tetraamines(nitrator-N)cobalt(III) iodide.

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Answer:

0.0188

Explanation:

using pv=nRt

where v--volume

p pressure

n number of moles

t temperature in kelvin

R molar gas constant=8.314atmmoldm^-3k^-1

4.972 × 9.583 =n × 8.314 × (31.8 + 273)

note I changed 31.8c to kelvin

making n subject of the formula

n=(4.972 × 9.583)/(8.314 ×(31.8 + 273)

n=(4.972 × 9.583)/(8.314 ×(304.8))

n=0.0188 moles

When a nonvolatile solute is added to a liquid, the concentration of the solute increases, which leads to a decrease in the vapor pressure of the solvent.

This is due to the fact that the solute particles occupy some of the space that would otherwise be filled by the solvent molecules. Since the solvent molecules have fewer spaces to escape into, the number of solvent molecules that escape into the air above the solution decreases, and therefore, the vapor pressure of the solvent decreases.

This decrease in vapor pressure is proportional to the concentration of the solute, and it is the basis for the phenomenon of vapor pressure lowering. This effect is important in many chemical and physical processes, such as boiling and evaporating, because it affects the temperature at which the solvent will boil.

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Answer:

Prokaryotic cells contain DNA, contain ribosomes, and lack a nucleus.

Answer:

Contains DNA

Contains Ribosomes

lacks a nucleus

Explanation: I took the quiz on edge

To calculate the pH of the solution that is 1.00 M HNO2 and 1.00 M NaNO2, we need to use the acid dissociation constant (Ka) of HNO2., Ka = [H+][NO2-] / [HNO2].

At equilibrium, the concentration of HNO2 and NO2- will be equal, since they are in a 1:1 ratio. Therefore, we can simplify the equation to: Ka = [H+]^2 / [HNO2]. Rearranging the equation to solve for [H+], we get: [H+] = sqrt(Ka x [HNO2]). We can use the Ka value of HNO2, which is 4.5 x 10^-4, and the concentration of HNO2 in the solution, which is 1.00 M, to calculate [H+]. [H+] = sqrt(4.5 x 10^-4 x 1.00), [H+] = 0.021 M, Now we can use the equation for pH: pH = -log[H+]. pH = -log(0.021) pH = 1.68. Therefore, the pH of the solution that is 1.00 M HNO2 and 1.00 M NaNO2 is 1.68.

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We know that temperature at which there would be the highest concentration of the products is 373 K

Temperature variations can affect the reaction's equilibrium position and, as a result, change the equilibrium constant (Keq) value. Whether a reaction is exothermic or endothermic affects the precise outcome.

We know that the higher the Keq would mean that the products would be more and this is going to happen when the Keq is 373 K as we can see from the table that has been shown in the question here displayed.

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Answer:

It will freeze or melt

Explanation:

Ice will melt if energy added

Water will freeze if energy removed

Answer:

\(T1=166.66K\)

Explanation:

According to Gay-Lussac’s law simply states that the ratio of the initial pressure and temperature is equal to the ratio of the final pressure and temperature for a gas of a fixed provided that the mass is kept at a constant volume.

Given:

Initial pressure, P1 = 1 atm

Final pressure, P2 = 1.5 atm

Final temperature, T2 = 250 K

The law can be applied using the below formula

P1T2 = P2T1

Then,

T1 = (P1T2)/P1 = (1*250)/(1.5) = 166.66 Kelvin.

\(T1=166.66K\)

:

Answer:

\(T_1=166.7K\)

Explanation:

Hello,

In this case, by applying the Gay-Lussac's law which help us to understand the pressure-temperature gas behavior via a directly proportional relationship:

\(\frac{P_1}{T_1} =\frac{P_2}{T_2}\)

In such a way, as we are asked to compute the initial temperature knowing the initial pressure and final both temperature and pressure, so we solve for it:

\(T_1=\frac{T_2P_1}{P_2}=\frac{250K*1atm}{1.5atm} \\\\T_1=166.7K\)

Best regards.

answer: heat needed=18,300

expanation

The Let's analyze the reactions you provided and determine if they absorb or release energy. Reaction 1 Leg → Leg + e.
This reaction represents the ionization of lithium, where an electron is removed from the gaseous lithium atom.

The energy needed for this process is given by the ionization energy. For lithium, the ionization energy is 520.2 kJ/mol. Since energy is required to remove the electron, this reaction absorbs energy. Answer for Reaction 1 Absorb, 520.2 kJ/mol. Reaction 2 Leg + e → Leg This reaction is the opposite of Reaction 1 and represents an electron being added to the gaseous lithium atom. The energy change for this process is given by the electron affinity. For lithium, the electron affinity is 59.6 kJ/mol. Since energy is released when the electron is added, this reaction releases energy. Answer for Reaction 2 Release, 59.6 kJ/mol.

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The answers include the following:

Tendons are connective fibrous tissues that attaches muscle to bone and they have a bright white color together with a strong and smooth appearance which can be observed when studied.

Tendons are very important as they help in ensuring that the movement of parts of the body are easy due to its holding some structures such as ligaments in place. It is present in all bone joints due to its numerous functions in the musculoskeletal system of organisms.

The tendon is very flexible and binds the muscles in the body to other structures which is why it is referred to as a connective tissue and the above answers are the most appropriate.

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Answer:

B: Microscopic organisms are not made of cells

Explanation:

Answer:

120 kPa = 1.25 L

Explanation:

Because 120/1.50 is 80. And then if you divide 100 by 80, you get 1.25.

The amino acid that is expected to have the smaller tlc rf value between valine and threonine is threonine.

Threonine is a crucial amino acid in humans. It is used to synthesize proteins in the body and is an important component of collagen, elastin, and enamel. It's also necessary for the development and function of many organs in the body. Threonine is an essential amino acid, which means it can't be produced by the body and must be obtained through diet or supplementation.

TLC stands for thin-layer chromatography. It's a technique for separating chemical compounds in a sample and is often used in the analysis of amino acids. TLC involves separating a sample into its component parts on a thin layer of absorbent material, such as silica gel, and then observing the movement of each compound as it moves through the material.

The Rf value, or retention factor value, is a measure of how far a compound has moved through a thin-layer chromatography (TLC) plate relative to the solvent front. It is used to identify compounds and compare their movement in the TLC plate. The Rf value is calculated by dividing the distance a compound has moved by the distance the solvent front has moved.

The amino acid that is expected to have the smaller tlc rf value between valine and threonine is threonine. The Rf value is calculated by dividing the distance a compound has moved by the distance the solvent front has moved, and it is used to identify compounds and compare their movement in the TLC plate. When comparing valine and threonine, threonine is expected to have a smaller Rf value than valine.

Threonine has an OH (hydroxyl) group attached to its side chain, whereas valine has a simple alkyl group. Because the OH group of threonine is more polar than the alkyl group of valine, it will have a greater affinity for the absorbent material in the TLC plate. This will result in a smaller Rf value for threonine compared to valine.

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The original size of the carbon-14 sample can be calculated using the concept of radioactive decay and the half-life of carbon-14. Based on the given information, the original sample size was approximately 416 grams.

The decay of a radioactive substance can be described by the equation N = N0 * (1/2)^(t/t1/2), where N is the current amount, N0 is the initial amount, t is the time elapsed, and t1/2 is the half-life of the substance.

In this case, the current amount N is 52.0 grams, the time elapsed t is 17,190 years, and the half-life t1/2 of carbon-14 is 5,730 years. We need to solve for the initial amount N0.

Rearranging the equation, we have:

N0 = N * (2^(t/t1/2))

Substituting the known values, we get:

N0 = 52.0 * (2^(17190/5730))

Calculating the exponent and evaluating the expression, we find:

N0 ≈ 52.0 * 0.125

N0 ≈ 6.5

Therefore, the original size of the carbon-14 sample was approximately 6.5 grams.

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Answer:

Yes

Explanation:

You can have 2s and have part of the 2p of the row in the p section.

Answer:

Yes

Explanation:

the gravity of an object depends on its mass. that's why the sun has its gravitational pull.

Answer:

Greenhouse gasses got their name from a greenhouse

Explanation:

Since greenhouses have plants inside in which the building lets sunlight in to the plants and greenhouse gasses trap heat. (sorry if my answer is confusing)

Na-atom lies at the extreme left of the third period and has the lowest ionization energy. Ar has the highest ionization potential due to full-filled configuration. Mg has higher IP than Al due to the half-filled configuration. P has higher IP than S due to a half-filled configuration. Hence the order is

Na < Al < Mg < Si < S < P < Cl < Ar

An element is a substance that can not be damaged down into a simpler layout. They may be distinguished by means of a completely unique atomic range. The elements are organized via their atomic variety in the periodic table, which highlights elements with similar residences.

Carbon is the most important detail of existence. Without this detail, existence, as we are aware of it, might not exist. As you will see, carbon is a vital element in compounds essential for lifestyles.

Kinds of elements :

1.) The elements are categorized as metallic, non-metal, and metalloid.

2.) The intense left aspect factors inside the periodic desk are metals, for example, sodium, calcium, cesium, and many others.

3)  Elements on the right side are usually known as non-metals, carbon, chlorine, oxygen, and many others.

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0.20 M NH₄, and 0.20 M HCI and  0.20 M NH₄, and 0.10 M HF are  combinations  that can be used to make a buffer. Thus option A and C are correct.

A buffer solution is an acid or a base aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa.Its pH changes very little when a small amount of strong acid or base is added to it.

Buffer solutions are used as a means of keeping pH at a nearly constant value in a wide variety of chemical applications. In nature, there are many living systems that use buffering for pH regulation. For example, the bicarbonate buffering system is used to regulate the pH of blood, and bicarbonate also acts as a buffer in the ocean.

As the combination of HCl and NH₄, and NH₄ and HF   are  combinations  that can be used to make a buffer. Thus option A and C are correct.

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Answer:

\(\boxed {\boxed {\sf 39.13 \ Liters}}\)

Explanation:

We want to find the new volume given the temperature, so we use Charles's Law. This states the volume of a gas is directly proportional to the temperature. The formula is:

\(\frac {V_1}{T_1}=\frac{V_2}{T_2}\)

We know the original volume is 20.0 liters and the temperature is 23.0 degrees Celsius. The temperature changes to 45.0 degrees Celsius, but we don't know the new volume. Substitute the known values into the formula.

\(\frac {20.0 \ L}{23.0 \textdegree C}=\frac{ V_2}{45.0 \textdegree C}\)

We are solving the new volume, so we need to isolate the variable V₂. It is being divided by 45.0 degrees Celsius. The inverse of division is multiplication, so we multiply both sides by 45.0 °C.

\(45 \textdegree C *\frac {20.0 \ L}{23.0 \textdegree C}=\frac{ V_2}{45.0 \textdegree C}* 45 \textdegree C\)

\(45 \textdegree C *\frac {20.0 \ L}{23.0 \textdegree C} = V_2\)

The units of degrees Celsius cancel.

\(45 *\frac {20.0 \ L}{23.0}= V_2\)

\(39.1304348 \ L=V_2\)

If we round to the nearest hundredth, the 0 in the thousandth place tells us to leave the 3.

\(39.13 \ L \approx V_2\)

The new volume of the balloon is approximately 39.13 Liters.

The balanced chemical equation for the reaction between mli2s and co(no3)2 is:
2mli2s + co(no3)2 → 2licl + cos + 2no2 + h2o

From the equation, we can see that two moles of mli2s react with one mole of co(no3)2. Therefore, we need to use the mole ratio to find out how much mli2s is required to react with 255 ml of 0.165 mco(no3)2.
Moles of co(no3)2 = (0.165 mol/L) x (0.255 L) = 0.042075 mol
According to the mole ratio, we need twice as many moles of mli2s to react with the given amount of co(no3)2. Therefore, the required moles of mli2s are:
Moles of mli2s = 2 x Moles of co(no3)2 = 2 x 0.042075 mol = 0.08415 mol
Now we can use the molarity and volume of the mli2s solution to find out how much volume is required to obtain 0.08415 moles of mli2s.
Molarity of mli2s = 0.160 mol/L
Volume of mli2s = Moles of mli2s / Molarity of mli2s = 0.08415 mol / 0.160 mol/L = 0.5259 L
Finally, we need to convert the volume to milliliters and round off the answer to three significant figures:
Volume of mli2s = 0.5259 L x 1000 mL/L ≈ 526 mL ≈ 526 ml
Therefore, the volume of 0.160 mli2s solution required to completely react with 255 ml of 0.165 mco(no3)2 is approximately 526 ml.
To solve this problem, we can use the concept of stoichiometry. The balanced chemical equation for the reaction between I2 and Co(NO3)2 is:
2Co(NO3)2 + 3I2 → 2CoI3 + 6NO3^-
From the balanced equation, we see that 2 moles of Co(NO3)2 react with 3 moles of I2. Now, we can use the given concentrations and volumes to find the moles of each reactant:
moles of Co(NO3)2 = (0.165 M)(0.255 L) = 0.042075 mol
Using the stoichiometry from the balanced equation:
moles of I2 required = (0.042075 mol Co(NO3)2) * (3 mol I2 / 2 mol Co(NO3)2) = 0.0631125 mol I2
Now, we can use the concentration of the I2 solution to find the volume needed:
volume of I2 solution = (0.0631125 mol I2) / (0.160 M) = 0.394453125 L Converting this to milliliters and expressing the answer in three significant figures:
volume of I2 solution = 394 mL

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Sodium Bisulfite converts Bromine (br2) to Bromide (br-). Sodium Bisulfite is a reducing agent.

In chemistry, a reducing agent is a chemical species that "donates" an electron to an electron acceptor. Examples of substances that are normally reducing agents include earth metals, formic acid, oxalic acid, and sulfite compounds. Reducing and oxidizing agents are responsible for corrosion, or "decomposition of metals by electrochemical activity." Corrosion requires an anode and a cathode.

Strong reducing agents are electropositive elements that can readily donate electrons in chemical reactions. Sodium, hydrogen and lithium are examples of strong oxidants. Weak reducing agents react less violently than strong reducing agents, but can participate in reactions that produce heat and gaseous products that pressurize the closed vessel and can participate in further reactions.

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The pituitary gland controls metabolism, growth, sexual maturation, reproduction, blood pressure, and many other vital physical functions and processes.

(Puberty is a big catch-all.)

The number of moles of diphosphorus trusulfide can be produced if 10 moles of phosphorus and 13.0 moles of sulfur react to make P₂S₃ is 40 moles.

To calculate the number of moles of diphosphorus trusulfide can be produced, we must know the balanced chemical equation for the reaction of 10 moles of phosphorus and 13.0 moles of sulfur to form P₂S₃ is:

P4₄+ 3S₈ → 4P₂S₃

One mole of P₄ reacts with 3 moles of S₈ to form 4 moles of P₂S₃.

The molar ratio of P₄:S₈:P₂S₃ is 1:3:4. Using this ratio, we can calculate the number of moles of P₂S₃ produced by reacting 10 moles of phosphorus and 13.0 moles of sulfur.

P₄:S₈:P₂S₃

= 10:13:??

= (10÷1):(13÷3):(4÷1)

= 10:4.33:4

Since the ratio of P₄:S₈:P₂S₃ is 10:13:4, and 10 moles of phosphorus react, the limiting reactant is phosphorus. Therefore, the maximum amount of P₂S₃ that can be produced is given by the moles of P₄ that reacted. 4 moles of P₂S₃ are produced from 1 mole of P410 moles of P₄ are reacted.

Therefore, the maximum amount of P₂S₃ that can be produced is:

4 moles P₂S₃/ 1 mole P₄ × 10 moles P₄

= 40 moles P₂S₃

Hence, 40 moles of diphosphorus trisulfide can be produced.

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Answer:

1. Protons

2. Protons and Neutrons

3. Valence electrons

Explanation:

C. The theoretical yield of aspirin is found to be 4.2g

The largest amount of product that could be generated from the provided reactant amounts is termed as the theoretical yield. The quantity of product that actually formed during the reaction in a laboratory environment is known as the actual yield.

C₇H₆O₃ + C₄H₆O₃→ C₉H₈O₄ ( aspirin)

No of moles of  salicylic acid => 3.2/138.122 => 0.023 mol

no of moles of acetic anhydride => 1.08 g/mL x 6.3 mL / 102.089 g/mol

                                                        => 0.066mol

salicylic acid is limiting reagent

Theoretical yield calculated:

1 mole of salicylic acid=> 1 mole of aspirin

      Hence,  0.023  mol of aspirin formed in this reaction.

Theorectical yield of aspirin =>  0.023 mol x 180g/mol => 4.2g

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The action is an example of a government's domestic policy at work is the implementation of a national healthcare system.

A national healthcare system is a policy designed to provide affordable and accessible healthcare services to all citizens within a country. This policy involves the government taking active steps to regulate the healthcare industry, such as establishing rules for the operation of hospitals, setting pricing guidelines for medical treatments and prescription drugs, and providing financial assistance to those who cannot afford healthcare. The development and execution of a national healthcare system require extensive planning and coordination among various government agencies, including those responsible for public health, medical research, and social welfare. In addition, the government must collaborate with private entities, such as healthcare providers and insurance companies, to ensure the efficient delivery of healthcare services.

By implementing a national healthcare system, the government aims to promote the well-being of its citizens and reduce health disparities among different socioeconomic groups. Moreover, a well-functioning healthcare system contributes to the overall stability and productivity of the nation, as healthier citizens are more capable of participating in the workforce and contributing to the economy. In summary, the establishment of a national healthcare system exemplifies a government's domestic policy at work, as it involves a comprehensive strategy to address the health needs of its population and promote national well-being.

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