The enthalpy of vaporization of Bromine is 15.4 kJ/mol. -7.7 kJ is the energy change when 80.2 g of Br₂ condenses to a liquid at 59.5°C.
What is Enthalpy of Vaporization ?The amount of enthalpy or energy that must be added to a liquid substance into gas substance is called Enthalpy of Vaporization. It is also known as Latent heat of vaporization.
How to find the energy change from enthalpy of vaporization ?To calculate the energy use this expression:
[tex]Q = n \Delta H_{\text{vapo.}[/tex]
where,
Q = Energy change
n = number of moles
[tex]\Delta H_{\text{Vapo.}}[/tex] = Molar enthalpy of vaporization
Now find the number of moles
Number of moles (n) = [tex]\frac{\text{Given Mass}}{\text{Molar mass}}[/tex]
= [tex]\frac{80.2\ g }{159.8\ g/mol}[/tex]
= 0.5 mol
Now put the values in above formula we get
[tex]Q = - n \Delta H_{\text{vapo.}[/tex] [Negative sign is used because Br₂ condensed here]
= - (0.5 mol × 15.4 kJ/mol)
= - 7.7 kJ
Thus from the above conclusion we can say that The enthalpy of vaporization of Bromine is 15.4 kJ/mol. -7.7 kJ is the energy change when 80.2 g of Br₂ condenses to a liquid at 59.5°C.
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do you think it matters if you report this quantity as 150 grand or 150.0 grams ? do they mean the same thing why or why not?
Answer:
Yes
Explanation:
Yes, I do think they mean the same thing. Explanation: 150 grams and 150 grams are the same thing and adding 0 to the end of a decimal
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, 150grams and 150.0 grams are the same measurement.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. 150 grams and 150.0 grams are the same measurement as both have same measurement.
Therefore, 50 grams and 150.0 grams are the same measurement.
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CaCl2 is dissolved in water. Which of the following is NOT one of the 3 steps involved in this solvation process.
(a) Ca+2 ions surrounded by negative sides of water molecules and Cl−
ions are surrounded by positive sides of water molecules
(b) Solvent-solvent interactions overcome (hydrogen bonds between water molecules break)
(c) Solute-solute interactions overcome (Ca+2 and Cl− ions separate)
(d) CaCl2 molecules absorb the water becoming larger molecules.
Water is absorbed by CaCl2 molecules, resulting in bigger molecules. In order for the solute to dissolve in the solvent, the solute-solute interactions between the solute particles must be disrupted.
How would one explain calcium chloride chemically?An inorganic material is calcium chloride, a salt with the chemical formula CaCl2. It is a white, crystalline substance that is highly water soluble at ambient temperature. It may be created by neutralizing calcium hydroxide with hydrochloric acid. By reducing the freezing point of water, calcium chloride is used to both prevent the production of ice and to remove it. This application makes the maximum use of calcium chloride.
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how can different parts of the sun rotate at different speeds
Answer:
Because unlike Earth and other solid objects, the entire Sun doesn't rotate at the same rate. Because the Sun is not solid, but is instead a giant ball of gas and plasma, different parts of the Sun spin at different rates. The interior of the Sun does not spin the same way as does its surface.
To determine the concentration of an unknown solution, the technique that can be used is titration, where the solution of a known concentration is used. The titrant is added to the burette with a known volume of unknown solution till the reaction is finished.
To determine the concentration of an unknown solution, the technique that can be used is called titration.
Titration is a qualitative analysis technique which is used to calculate the unknown concentration of a given analyte in a solution.
In this process, a standard solution of known concentration and volume is taken(titrant). This solution is then allowed to react with the analyte until the endpoint attained.
In the first step of this procedure, a small amount of the analyte is added to a conical flask or a beaker, followed by the addition of a small amount of indicator. This is then placed under the burette containing the standard solution or titrant.
Small volumes of titrant are added to the analyte dropwise until a permanent colour change is observed on reaching the end point.
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There are many fluctuations that may occur in the carbon cycle. Which of the following is NOT a natural cause of the fluctuations of the carbon cycle?
A. Industrial activities
B. Seasonal variations
C. Changes in ocean currents
D. The exchange that occurs between carbon sinks
Answer:
A
Explanation:
That one doesn't fall in the category of carbon cycle. It has nothing to do with natural causes since it is a man made thing. Industrial activities is not a natural cause.
Please help
C6H12O6 + 602 → 6CO2 + 6H₂O
Which set of reactants will be the
most efficient (least wasteful of
materials) for the reaction?
The most efficient set of materials would be 0.5 mol of [tex]C_6H_{12}O_6[/tex] and 3.0 mol of [tex]O_2[/tex]. Option D.
Mole ratio of reactantsFrom the balanced equation of the reaction illustrated in the image, the mole ratio of [tex]C_6H_{12}O_6[/tex] to [tex]O_2[/tex] is 1:6. In other words, for every 1 mole of [tex]C_6H_{12}O_6[/tex] that is consumed in the reaction, 6 moles of [tex]O_2[/tex] is required for a complete reaction.
In order for the reaction to remain efficient without any of the reactants remaining after the reaction, the mole ratio of the 2 reactants has to be maintained.
Thus:
1.5:3.0 does not equate to 1:61.0:30 does not equate to 1:63.0:6.0 does not equate to 1:60.5:3.0 equates to 1:6In other words, only 0.5 mol of [tex]C_6H_{12}O_6[/tex] and 3.0 mol of [tex]O_2[/tex] will leave no leftovers after the reaction.
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What is the molarity when 24 grams of lioh is added to 200 ml of water?
The molarity when 24 grams of LiOH is added to 200 ml of water is 4.2M.
What is molarity, for instance?The moles of solute per liter of solution is measured as molarity. For instance, when table salt is dissolved in water, water serves as both the solution and the solute. Sodium chloride weights 58.44 grammes per mole. One molar solution, or 1M, is created by dissolving 58.44 grammes of sodium chloride in one liter of water.
What does Molality refer to?The term "total moles of a solute contained in a kilogram of a solvent" is used to describe molality. Molal concentration is another name for molality. It is a measurement of a solution's solute concentration.
Determination of molarity:The molarity of the given LiOH solution is found to be 1.99 mol/L or 1.99M.
Given weight = 20g
molar mass of lithium hydroxide = 7+16+1=24g
volume = 200ml = 0.2l
Number of mole (n) = given weight /molar mass of lithium hydroxide
n = 20/24 =0.84
Molality = Number of mole (n) /volume of solvent
molality = 0.84/0.2
= 4.2M
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Which material has most effect as thermal mass?
Materials such as concrete, bricks and tiles absorbs and store more heat as compared to materials such as timber and cloth which have low thermal masses.
Thermal mass in floors is most effective. In most of the climate conditions a concrete slab which is insulated underneath and around the edge and where it is in direct contact with the ground absorbs more energy and thus it is the most effective way to increase thermal mass.
Thermal mass refer to the property of construction materials to absorb, store, and release heat energy.
Water also have high thermal mass.
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PLEASE CAN SOMEONE HELP ME PLEASE ! NO FAKE ANSWER PLEASE
Yes, it is the right response. Although the elements are imaginary, they resemble actual elements .Nomenclature is an organism name system used in biological classification.
What does nomenclature mean?The Latin words nomen (name) and calare (to call) are the source of the word nomenclature. Both the Latin word nomenclatura and the English word nomenclator, which also denotes a source or broadcaster of names, relate to a list of names.
What exactly is nomenclature and how is it crucial?Nomenclature is an organism name system used in biological classification. Genus & species names, two Latinized nouns drawn from numerous sources, serve as indicators of the species whereby the creature belongs.
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(scientific reason)
If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease....
why's that pls help begging
If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease because the equilibrium will shift in the backward direction.
What is sodium hydroxide ?Sodium hydroxide is an ionic compound consisting of Na⁺ and OH⁻. It is also called as caustic soda. It is an inorganic compound with chemical formula NaOH.
When NaOH dissolve in water it is exothermic in nature. As the temperature increases, the equilibrium will shift in the backward direction.Therefore,as to nullify the effect of increased temperature. It will decrease the solubility of NaOH in water.
Thus, If the temperature increases, then the concentration of sodium hydroxide (NaOH) will decrease.
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5. Why would a measurement be reported as 18.0 mL instead of 18 mL?
Answer:
A measurement may be reported as 18.0 mL instead of 18 mL to indicate that it has been measured with greater precision.
The decimal point in 18.0 mL indicates that the measurement was taken to the tenths place, meaning that the actual measurement is between 17.5 mL and 18.4 mL. On the other hand, 18 mL implies that the measurement is between 17.5 mL and 18.9 mL.
Therefore, the use of the decimal point in this case is a way to indicate that the measurement has a higher degree of precision. It is used as a way to communicate that the measurement was taken with greater accuracy and that the number has been rounded to the nearest tenth.
A measurement may be reported as 18.0 mL instead of 18 mL to indicate that it is an exact or precise measurement, rather than an approximation. In scientific experiments or laboratory work, measurements are often reported with a certain number of significant figures, which reflect the precision of the measurement.
In this case, 18.0 mL has one decimal point and implies that the measurement was made to the nearest 0.1 mL, whereas 18 mL doesn't have a decimal point and implies that the measurement was made to the nearest mL.
Additionally, in some cases, the trailing zero after a decimal point is used to indicate the accuracy of the measurement and to make it clear that it is not a rounded number.
25. Inferring A film badge consists of a piece of film
wrapped in a piece of dark plastic or paper. Doses
of what kinds of radiation can be measured with
this simple piece of equipment? Explain.
CAN ANYONE HELP ME PELASE???
Doses of gamma rays, X-rays of electromagnetic radiation and beta particles are measured with simple piece of equipment.
What is electromagnetic radiation?The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.
The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.
In vacuum ,all the electromagnetic waves travel at the same speed that is with the speed of air.The position of an electromagnetic wave in an electromagnetic spectrum is characterized by it's frequency or wavelength.They are emitted by electrically charged particles which undergo acceleration and subsequently interact with other charged particles.
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71.05 g of sodium sulfate (Na2SO4) are dissolved to obtain 2 liters of standard solution. What is the concentration of a solution
Answer:
I do k .............................
If we react 10 moles of hydrogen with 6 moles of oxygen. what is the limiting reagent and how much water is produced?
The weight of hydrogen is equal to moles multiplied by the molar mass since we are asked to determine its weight. It will be 24 grammes because that is 2, thus this is 24 grammes.
How many moles of CO2 are produced from 6 moles of O2?The mole ratio of O2 to CO2 is 1:1 according to the equation that is balanced. Thus, the amount of CO2 created from 6 moles of O2 is equal to (1/1) x 6 mol, or 6 mol.The reaction's byproducts contain 24 oxygen atoms. In total, 6 oxygen molecules are needed for every glucose molecule in the process. The molecular formula for ATP energy is 6O2 + C6H12O6 --> 6CO2 + 6H2O.After the reaction is finished, 10 moles of water will be produced. Explanation: Water is being produced by the reaction between 10 moles of hydrogen and 6 moles of oxygen.Thus, the reaction between ten volumes of dihydrogen gas and five volumes of oxygen gas results in ten volumes of water vapour. Keep in mind the Avogadro's law, which explains how the volume and number of moles relate to one another.To learn more about moles refer to:
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are done.
__C2H2 +
__0₂
__CO₂ +
__H₂O
The balanced equation is, 2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O.
How can the equation be balanced?The reaction's balanced equation is as follows.
C₂H₂+O₂ → CO₂+H₂O
Water and carbon dioxide gas are created when dimethyl ether and oxygen combine.
Following is the reaction's balanced chemical equation:
2C₂H₆ + 7O₂ → 4CO₂ + 6H₂O.
Three moles of water and two moles of carbon dioxide gas are produced in this reaction when one mole of dimethyl ether combines with two moles of oxygen gas.
According to the law of conservation of mass, the mass of the reactants and products in a chemical reaction should be equal. As a result, each element's number of atoms stays constant throughout the chemical reaction. As a result, the chemical equation that represents the chemical process needs to be balanced. A chemical equation is considered to be balanced when the sum of the atom counts on the reactants and products sides equals one.
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Complete question -
Balance the given equation -
__C2H2 + __0₂ → __CO₂ + __H₂O
HELP!!!!!!!! This question is rlly confusing!!!!
The forms of heat transfer and examples of them when matched, are:
Conduction:
Touch transfers heat Earth warms airConvection :
Warm air rises Liquid / gas transfer heatRadiation
Sun heats Earth Waves transfer heat What are the forms of heat transfer ?There are three main forms of heat transfer:
Conduction: This is the transfer of heat through a solid material. Heat is conducted through the material by the collision of atoms and molecules. Touch therefore transfers heat.
Convection: This is the transfer of heat by the movement of a fluid or gas. In convection, heat is transferred by the movement of the fluid or gas itself.
Radiation: This is the transfer of heat by electromagnetic waves, such as infrared radiation. Radiation does not require a medium for heat transfer and can occur in a vacuum. The sun's energy reaches the Earth through radiation, and heat from a fire can also be felt by radiation.
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calculate the number of moles of c2h4 that are actually produced in the experiment and mesaured in the gas collection tube
35.7 x 1atm/760 torr = 0.0470 atm
P(ethene) = P(total) - P(water) = 0.822atm - 0.0470atm = 0.775atm
n= PV/RT = (0.775atm)(0.0854L)/(0.08206L atm mol-1 K-1)(305K) = 0.00264mol.
What is moles?Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.The mole designates an extremely large number of units, 6.02214076 × 1023. The General Conference on Weights and Measures defined the mole as this number for the International System of Units (SI) effective from May 20, 2019. The mole was previously defined as the number of atoms determined experimentally to be found in 12 grams of carbon-12.The number of units in a mole also bears the name Avogadro’s number, or Avogadro’s constant, in honour of the Italian physicist Amedeo Avogadro (1776–1856). Avogadro proposed that equal volumes of gases under the same conditions contain the same number of molecules, a hypothesis that proved useful in determining atomic and molecular weights and which led to the concept of the mole.
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Please answer the questions in the picture below
Answer b
Explanation:
Cae-2 - Reeta wa feeling thirty but there wa only a pot of water at home which wa muddy and unfit for drinking. How do you think Reeta would have made thi water fit for drinking if the following material were available to her? Alum, tub, mulin cloth, ga tove, thread, pan and lid. Brainly
Reeta could have made the water which is fit for drinking purposes using the materials available to her.
With the available materials, Reeta would have taken the following steps to purify water.
Firstly, she can filtered the muddy water with the help of a muslin cloth, which is mainly used for the purification purposes. Now, she has to tie a piece of Alum with the help of a thread and submerge it in water and then leave the water which is undisturbed for some time. After resting, the impurities will finally settle down at the bottom and the water from the top can be drained off. Now she has to boil the discarded water for 10 minutes by covering it with the pan and making it cool down followed by filtering the water. And finally, the water will be purified with filtration that will make it fit for drinking purpose.
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A 13. 1-g ample of ice at −17. 9°C i mixed with 103. 5 g of water at 73. 0°C. Calculate the final temperature of the mixture auming no heat lo to the urrounding. The heat capacitie of H2O() and H2O(l) are 2. 03 and 4. 18 J/g·°C, repectively, and the enthalpy of fuion for ice i 6. 02 kJ/mol
The final temperature of the mixture can be considered as 73°C.
To calculate the final temperature of the mixture, we need to use the heat capacity and the enthalpy of the melting of water. The heat capacity of water is the amount of heat required to raise 1 gram of water by 1 degree Celsius. Melting enthalpy is the amount of heat required to melt one mole of a solid at its melting point.
First, calculate the total heat absorbed in the process of melting the ice. The heat absorbed by ice is equal to the heat capacity of the ice multiplied by the mass of the ice and the change in temperature.
Qice = (mass of ice) x (heat capacity of ice) x (change in temperature)
Qice = (13.1 g) x (2.03 J/g·°C) x (17.9°C - (-17.9°C))
Qice = 13.1 g x 2.03 J/g·°C x 35.8°C = 4,849.8 J
We can also calculate the total heat absorbed by the water during the increase in temperature. The heat absorbed by the water is equal to the heat capacity of water multiplied by the mass of the water and the change in temperature.
Qwater = (mass of water) x (heat capacity of water) x (change in temperature)
Qwater = (103.5 g) x (4.18 J/g°C) x (73.0°C - 0°C)
Qwater = 103.5 g x 4.18 J/g°C x 73.0°C = 30,529.1 J
The final temperature of the mixture can be found by using the total heat absorbed by the ice and water, and the heat of fusion.
The final temperature of the mixture is approximately equal to the temperature of the water before mixing (73.0°C) because the heat absorbed by the ice during melting is much smaller than the heat absorbed by the water during heating.
Q total = Q ice + Q water + heat of fusion
Q total = 4,849.8 J + 30,529.1 J + 6,02 kJ/mol x (13.1g / 18g/mol)
Now we can solve for the final temperature:
Final temperature= Q total / (mass of mixture * heat capacity of water)
The final temperature of the mixture can be considered as 73°C.
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Which flask has the highest
pressure, assuming they all contain
1 mole He at 298K?
Answer: d 1.0l
Explanation:
How many grams of potassium chloride (KCI are needed to prepare 0.750 L of a 150 M solution of potassium chloride in water?
The grams of potassium chloride (KCI are needed to prepare 0.750 L of a 150 M solution of potassium chloride in water is the
83.81 g.
Given that :
Molarity of the KCl = 1.50 M
Volume of the potassium chloride = 0.750 L
The Molarity expression is given below :
Molarity = moles / volume in L
moles = Molarity × volume
moles = 1.50 × 0.750
moles = 1.125 mol
molar mass of the KCl = 74.5 g/mol
Mass of the KCl = moles × molar mass
Mass of the KCl = 1.125 × 74.5
= 83.81 g
Thus, the mass of KCl is 83.81 g
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Why is a crystal of strontium chloride (srcl2) described as an extended structure?.
Because it is structured in a repeating pattern, the crystal of strontium chloride (SrCl2) is referred to as having an extended structure.
A group of atoms or molecules that are present in a repeating pattern and are arranged in a specific ratio are said to produce extended structures in crystals. Crystals are composed of clustered together atoms of a single element or, in some cases, molecules.
We can infer that the strontium chloride (SrCl2) crystal is regarded as an extended structure because of its organization in a repeating pattern because of its repeating pattern and constant ratio of strontium chloride (SrCl2).
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can anyone help with this question?
If the wight of copper metal is 130.42 then molar mass of cu 63.546 u.
what is 1 mole?The International Unit System uses the mole (symbol: mol) as the measure of material quantity. How many basic entities of a specific drug are present in an object or sample is determined by the quantity of that material. It is specified that the mole comprises precisely 6.022140761023 elementary entities.
How can the molarity of Cu be determined?The average atomic mass of the element copper, which appears on the periodic table as 63.55 AMU, can be used to calculate its molar mass. The SI symbol of mole is mol.
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calculate the frequency of radiation with a wavelength of 492 nm.
The frequency of radiation with a wavelength of 492 nm is
6.09 x 10^14 Hz.
What is the meaning of frequency of radiation of wavelength?
Frequency of radiation of wavelength is a measure of how often a particular wavelength of radiation occurs. It is measured in Hertz (Hz) and is equal to the number of wave cycles per second. Wavelength is the distance from one wave crest to the next, so frequency is related to the speed of the wave. A higher frequency corresponds to a shorter wavelength, and a lower frequency corresponds to a longer wavelength.
λ= 480nm =480×10−9m [∵1nm=10−9m]
c=3×108m/sec
Frequency, v=λ/c
=[tex]\frac{3*10^{8}ms^{-1} }{480*10^{-9}m }[/tex]
= [tex]6.09*10^{14}s^{-1}[/tex]
=[tex]6.09*10^{14} Hz.[/tex]
Therefore, 6.09 x 10^14 Hz is the answer.
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What is the number of ammonia molecules made when 6 grams of hydrogen gas reacts with excess nitrogen?
4 moles of ammonia molecules can be made when 6 grams of hydrogen gas reacts with excess nitrogen.
[tex]N_{2}[/tex](g) + 3[tex]H_{2}[/tex](g) → [tex]2NH_{3}[/tex](g)
1 mole of [tex]N_{2}[/tex] reacts with 3 moles of [tex]H_{2}[/tex]
Therefore, 6 moles of [tex]N_{2}[/tex] will react with 18 moles of [tex]H_{2}[/tex]
[tex]H_{2}[/tex] + 6 no. of moles. ( Hydrogen is a limiting reagent).
No. of moles of ammonia are formed when 3 moles of [tex]H_{2}[/tex] will react with excess of [tex]N_{2}[/tex] = 2
No. of moles of ammonia are formed when 6 moles of [tex]H_{2}[/tex] will react with excess of [tex]N_{2}[/tex] = 2/3×6 = 4
Therefore, it is a gaseous equation (all the reactants as well as products are gases).
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A cube of each of metal i placed in a cup of water, they both diplace the ame volume of water ,aying how i thi poible?
This is possible because the volume of water displaced by an object is determined by the volume of the object, not its weight or mass.
The cube of metal I and the cube of another metal both have the same volume, so they would displace the same volume of water. The principle of buoyancy states that the buoyant force on an object is equal to the weight of the fluid that is displaced by the object can be applied in here. Therefore, if two objects have the same volume, they will displace the same amount of fluid and experience the same buoyant force.
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7. Is each structural formula correct according to the HONC 1234 rule? For any molecules
that don't follow the HONC 1234 rule, repair the incorrect structural formula (Note: There
may be more than one way to correct a formula)
a. H
|
H-C-H
H-C-H
H-C-H
|
O
|
H
b.
H
|
H-O-H
H-C-H
H-C-H
|
H
c.
H H
| |
H-C-C-H
| |
O H
|
H
d.
H H
| |
H-C-C-N-H
| |
O H
|
H
Answer: divide the falling number and then get it
Explanation: find the answer
Give the common name for(CH3)2CHCH2Cl
a. Sec-butyl chloride
b. Ter-butyl chloride
c. N-butyl chloride
d. Iso-butyl chloride
e. Neo-butyl chloride
The correct answer is option d. The common name for (CH3)2CHCH2Cl is Iso-butyl chloride.
Iso-butyl chloride is a chlorinated derivative of isobutane. It is organochlorine compounds. Isobutyl chloride is made up of compounds of chlorine, carbon, and hydrogen.
Other important details about Iso-butyl chloride is as following-
Formula: C4H9Cl
Boiling point: 69 °C
Molar mass: 92.57 g/mol
Density: 877 mg mL−1
Melting point: −131 °C (−204 °F; 142 K)
Heat capacity (C): 158.6 J K−1 mol−1
Refractive index (nD): 1.398
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How do you draw
3-ethyl-5-isobutylnonane
Answer:
Explanation:
Structure of 3-ethyl-5-isobutylnonane
It is given in the following attachment:
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The organic compound 3-ethyl- 5-isobutylnonane contains 9 carbon atoms in the long chain and one ethyl branch at the third carbon atom and one isobutyl group in the 5th carbon atom as in the image.
What are hydrocarbons ?Hydrocarbons are organic compounds with carbon -hydrogen bonds. The organic compounds are named based on the rules of IUPAC. The compound gets its basic name from the number of carbon atoms in the longest chain.
If the number of carbons atoms is one, the chain is given its suffix meth, eth for two prop for three and so on. The chain with 9 carbon atoms are named with nonane in the end.
Here, the given compound contains an ethyl group as a branch in third carbon in the chain and an isobutyl group in the 5th position as shown in the image given below:
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