Answer:
11.043 moles
Explanation:
In order to calculate the moles, we first need to find the molar mass of the compound.Therefore:
Mr of C[tex]_{2} }[/tex]H[tex]_{6}[/tex]O = (12 x 2) + (1 x 6) + 16
= 46 g
Now to calculate the moles we use the formula : given mass/molar massTherefore we get: 508/46 = 11.043 moles
How many hydrogen bonds will be found within an alpha helix that is 18 amino acids long? A) 14 B) 18 C) 22 D) 36
14 hydrogen bonds will be found within an alpha helix that is 18 amino acids long option - A is correct answer.
Alpha helix contains hydrogen bonds, right?Hydrogen bonds between the peptide bonds keep the -helix in place. Four amino acid residues ahead of each peptide bond C-O is a peptide bond N-H that is hydrogen bonded. The main chain's hydrogen bonds each C-O and N-H together.
Two hydrogen bonds involve each peptide link in an alpha helix. Four units ahead in the primary structure, the N-H of the peptide link and the C=O are hydrogen bonded.
As a result, the first amino acid's C=O and the fifth amino acid's N-H form a hydrogen bond.
The second amino acid's C=O forms a hydrogen bond with the sixth amino acid's N-H.
The third amino acid's C=O forms a hydrogen bond with the seventh amino acid's N-H.
The 14th amino acid's C=O forms a hydrogen bond with the 18th amino acid's N-H.
So there are 14 hydrogen bonds in total.
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The following reaction has a ΔG∘rxn=9.4 kJ at 25 ∘C. Find ΔGrxn when PNO2=0.109 atm and PNO =9.2 atm at 25 ∘C. 3NO2(g)+H2O(l)→2HNO3(l)+NO(g)
Answers, pick one:
a. 22.0 kJ
b. 12.0 kJ
c. 31.4 kJ
d. -12.6 kJ
The Gibbs free energy (ΔGrxn) when PNO₂ is0.109 atm and PNO is 9.2 atm at 25°C is 31.4KJ option - c is correct answer.
Describe Gibbs free energy.By adding the energies from the reaction's right and left sides, respectively, and deducting them, we can determine the Gibbs Free energy (Grxn) of any reaction. The calculation shows that the reaction moves to the right if Grxn > 0. The reaction moves to the left if the Grxn is greater than 0.
we have to use the equation
ΔG(rxn)=ΔG°(rxn)+RTlnQ ------1
where
ΔG°(rxn) of the reaction given 9.4 kJ
R = gas constant 0.008314 kJ/mol K
T = 273 + 25 = 298 K
furst you have to find the Q value
Q = [NO] / [NO₂]₂
Q = [9.2] / [0.109]3
Q = 9.2 / 0.01188 = 7104.088
substitute the values in equation 1
ΔG(rxn)= 9.4 kJ + (0.008314 kJ/mol K)(298K) ln(7104.088)
ΔG(rxn)= 9.4 + 21.97
ΔG(rxn)= 31.37 kJ
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What is oxidized when you burn fuel?s oxidized when you burn fuel?
Answer:
Explanation:
In stoichiometric combustion of a hydrocarbon fuel, the fuel is reacted with the exact amount of oxygen required to oxidize all carbon, hydrogen, and sulfur in the fuel to CO2, H2O, and SO2.
Answer:
carbon, hydrogen, and sulfur.
How many grams of LiF would be present in 575 mL of 0.750 M LiF solution?
a. 11.2
b. 1.12 x 104
c. 19.9
d. 33.8
e. 0.0338
Grams of LiF that would be present in 575 mL of 0.750 M LiF solution is : a.)11.2.
What is molar mass?In chemistry, molar mass of a chemical compound is defined as the ratio between mass and the amount of substance of any sample of said compound. The molar mass is bulk and not a molecular property of a substance.
Given , V= 575 mL and M= 0.750 M
As we know, No. Moles (mol) = Molarity (M) x Volume (L)
= 0.750 x 0.575
= 0.431 mol.
For LiF, molar mass is 25.939 g/mol.
As, Mass (g) = No. Moles (mol) x Molar Mass (g/mol)
= 0.431 x 25.939
= 11.2 g
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Beryllium reacts with a certain element to form a compound with the general formula BeX. Determine (with evidence/working) the most likely formula for the compound formed between potassium an element X.
Beryllium having valency 2 reacts with a certain element to form a compound with the general formula BeX. Hence, KX is the most likely formula for the compound formed between potassium and element X.
What is Beryllium?A chemical element with the atomic number 4 and the symbol Be is referred as beryllium. It has the valency of 2. Beryllium is an alkaline earth metal that is steel-gray in color, tough, light, and brittle. It is a divalent element that only naturally occurs in minerals when combined with other elements. Beryl and chrysoberyl are well-known gemstones that contain a lot of beryllium.To know more about Beryllium visit
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assuming the volume is 2 l, calculate the equilibrium constant kc for the reaction.
The equilibrium constant kc for the reaction X2(g) + 2Y(g) <=> 2XY(g) is 4 assuming the volume is 2L.
Given the reaction is X2(g) + 2Y(g) <=> 2XY(g)
By doubling the reactants we get 2X2(g) + 4Y(g) <=> 4XY(g)
Consider the mole ratio of the following reactants and products by taking one mole of each molecule initially.
Let the concentration of X2 = 2/2 = 1
The concentration of Y = 2/2 = 1
The concentration of XY = 4/2 = 2
We know that the equilibrium constant that describes this equilibrium is equal to Kc.
Kc = [AB]^2/[A].[B] = (2)^2/1 x x = 4
Hence the equilibrium constant Kc = 4
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complete question: The diagram represents the equilibrium state for the reaction X2(g) + 2 Y(g) == 2 XY(g) Assuming the volume of the cylinder is 2 L, calculate the equilbrium constant; Kc , for this reaction. Assume that each molecule represents one mole Kc How will the number of XY molecules change if the volume of the equilibrium mixture is increased?
What product results from the SN2 reaction between (R)-2-chloropentane and hydroxide?
a. (R)-2-pentanol
b. (S)-2-pentanol
c. racemic pentanol
d. 1-pentanol
a. (R)-2-pentanol product results from the SN2 reaction between (R)-2-chloropentane and hydroxide
The SN2 reaction, also known as a substitution reaction , is a type of reaction in which a nucleophile (in this case, hydroxide) attacks the electrophilic carbon atom of an alkyl halide (in this case, (R)-2-chloropentane) in a one-step, bimolecular process. The reaction proceeds with the inversion of the configuration of the carbon atom that was originally attached to the leaving group.The nucleophile (OH-) attacks the carbon atom that bears the chlorine atom, this will lead to the formation of (R)-2-pentanol and chloride anion. It is important to note that the reaction inversion of the configuration at the carbon atom that bears the chlorine atom, which means that the product is the enantiomer of the starting material, which is (R)-2-pentanol
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For the dissolution of LiCl in water, ΔHsoln=−37kJ/mol.
Which term would you expect to be the largest negative number: ΔHsolvent, ΔHsolute, or ΔHmix?
A) ΔHsolvent
B) ΔHsolute
C) ΔHmix
The largest negative number would be ΔHmix, which is equal to the sum of ΔHsolvent and ΔHsolute. In the case of the dissolution of LiCl in water, ΔHsolvent is positive and ΔHsolute is negative, so the sum of the two results in a negative number.
ΔHmix is the enthalpy of mixing, which is the amount of energy released or absorbed when two substances are mixed together. ΔHmix is equal to the sum of the enthalpy of the solvent (ΔHsolvent) and the enthalpy of the solute (ΔHsolute).
ΔHmix is usually expressed in terms of the amount of energy released or absorbed per mole of the substance being mixed. For example, the enthalpy of mixing for the dissolution of LiCl in water would be
ΔHmix = ΔHsolvent + ΔHsolute = +24kJ/mol + -37kJ/mol = -13kJ/mol.
This means that -13kJ of energy is released per mole of LiCl dissolved in water.
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Calculate the de Broglie wavelength of a 300-g object moving at a velocity of 50 m/s (about 100 mph).
O 4x10 -38 m O 4x10-35 m O 4x 10 9 m O 4x10 12 m
The de Broglie wavelength of a 300-g object moving at a velocity of 50 m/s is 4×10³⁵ meters. Hence, option (B) is correct.
What is the de Broglie wavelength?When studying quantum mechanics, the de Broglie wavelength is a key idea. De Broglie wavelength is the wavelength (λ) that is connected to an item in relation to its momentum and mass. Typically, a particle's momentum is inversely proportional to its de Broglie wavelength.
The de Broglie wavelength of a 300-g object moving at a velocity of 50 m/s is = Planck constant/momentum
= 6.6 ×10⁻³⁴/(0.300×50) meter
= 4×10³⁵ meters.
The de Broglie wavelength of a 300-g object travelling at 50 m/s is 4*10^35 meters. As a result, option (B) is accurate.
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draw a lewis structure (including all lone pair electrons) for the species GeBr4:
The Lewis structure for GeBr4 is shown below. It has a total of 32 valence electrons, with 6 in the lone pairs and 26 in the bonds. The structure is a tetrahedral geometry, with the central Ge atom bonded to four Br atoms.
The Lewis structure, also known as the electron-dot structure, is a type of diagram used to represent the valence electrons of an atom. It shows the number of electrons surrounding an atom, as well as how they are arranged around the nucleus. The Lewis structure is used to predict the geometry of a molecule, the reactivity of the molecule, and the types of bonds that the molecule can form. It is also used to determine the formal charge of each atom in a molecule.
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Which layer of the atmosphere is the least dense? A. mesosphere B. troposphere C. stratosphere D. exosphere
The answer is A. Mesosphere. It isn't the least dense overall, but it is out of these options.
Answer:
D: is the correct answer
An electron in the second main energy level and the second sublevel is described by the symbols a. 1s.
b. 2s. c. 1p. d. 2p.
It is possible for an electron to be free or linked to an atom. An electron is a negatively charged subatomic particle (not bound).
What is in a electron?Unattached or attached to an atom, an electron is a negatively charged subatomic particle (not bound). One of the three main types of particles inside an atom, along with protons and neutrons, is an electron that is linked to the atom.
The tiniest and least massive component of an atom is an electron, which has a negative charge. In a neutral atom, the number of protons and electrons is equal. For instance, the hydrogen atom only contains one proton and one electron. While the uranium atom has 92 protons and, thus, 92 electrons.
The exterior of the nucleus is surrounded by negatively charged electrons in orbit.
Therefore, the correct answer is option d) 2p.
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Describe some of the properties you expect for element 119.
At a fixed temperature and pressure, a 0.474 mol sample of gas has a volume of 8.65 L. How many mol of gas will have a volume of 4.39 L under these same conditions?
The volume of the gas is directly proportional to the number of moles of the gas. Hence, when volume is reduced to 8.65 L to 4.39 L, number moles reduces to 0.24 mol.
What is Avogadro's law?According to Avogadro's law, the volume of a gas is directly proportional to the number of moles. Thus n/V = a constant
If n1 and V1 be the initial number of moles and volume and n2, V2 be the final quantities, then,
n1/V1 = n2/V2
Given, n1 = 0.474 mol
V1 = 8.65 L
V2 = 4.39 L
then, n2 = n1 V2/V1
n2 = (4.39 L× 0.474)/8.65 mol
= 0.24 mol
Therefore, the number of moles of gas at the reduced volume is 0.24 mol.
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The information provided below was obtained from the label of the commercial stock
bottle of concentrated tetraoxosulphate (VI) acid. Calculate the volume of the acid that
is needed to prepare 8dm3
of 0.5moldm-3
solution of the compound from the stock.
Specific gravity of H2SO4 = 1.84gcm-3
% purity of acid =97%
Molar mass = 98gmol-1
205.7 cm^3 (or 0.2057 L) of the concentrated tetraoxosulphate (VI) acid to prepare 8 dm^3 of a 0.5 mol/dm^3 solution of the compound.
How do you calculate the volume?To prepare 8 dm^3 of a 0.5 mol/dm^3 solution of tetraoxosulphate (VI) acid from a stock solution, you need to use:
(0.5 mol/dm^3) x (8 dm^3) x (98 g/mol) = 392 g of tetraoxosulphate (VI) acid
Since the acid is 97% pure, we know that:
(97/100) x (392 g) = 379.84 g of tetraoxosulphate (VI) acid is pure acid
We can use the specific gravity of the acid, which is 1.84 g/cm^3, to calculate the volume of the acid needed:
379.84 g / (1.84 g/cm^3) = 205.7 cm^3 of tetraoxosulphate (VI) acid
So, you would need to use 205.7 cm^3 (or 0.2057 L) of the concentrated tetraoxosulphate (VI) acid to prepare 8 dm^3 of a 0.5 mol/dm^3 solution of the compound.
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Rank the indicated carbon atoms in order of increasing chemical shift. Be sure to answer all parts.
Without the information about the compound, it is not possible to rank the carbon atoms in order of increasing chemical shift.
How to rank the carbon atoms in increasing order?In an NMR spectrum, the chemical shift (δ) of a carbon atom is a measure of the electron density around that carbon atom. The chemical shift is typically measured in parts per million (ppm) and is dependent on the chemical environment of the carbon atom.
In order to rank the indicated carbon atoms in order of increasing chemical shift, it is important to know the chemical structure of the compound and the chemical environment of each carbon atom. Without the information about the compound, it is not possible to rank the carbon atoms in order of increasing chemical shift.
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Which of the following compounds will have a prominent peak at (M-127)? a. CH3CH2CH2I b. (CH3CH2)3CCH2Cl c. (CH3)3CCH2CH2Br d. (CH3)2CHCH(CH3)2 e. none of these
The compounds that follow will show a noticeable peak at (M-127) are CH3CH2CH2I
What is meant by compounds?A compound in chemistry is a material that is created when two or more separate chemical elements are mixed in a specific order. The interaction of the elements creates chemical connections that are challenging to break. Shared or exchanged electrons between atoms cause the formation of these bonds. (KOM-pownd) A substance in science that is created through the chemical joining of two or more distinct elements Table salt (NaCl), which is derived from the elements sodium and chloride, and water (H2O), which is created from the elements hydrogen and oxygen, are two examples of compounds.A compound is a material that is created when two or more components are bonded chemically.To learn more about compounds, refer to:
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Which of these changes is an example of a chemical change?
A. ice cream solidifying
B. a tree decomposing in a forest
C. a figure made from a block of modeling clay D. polishing a gemstone
Answer:
B. a tree decomposing in a forest
what organic product would you obtain from reaction of 1-pentanol with cro3, h2o, h2so4?
Pentanoic acid product will obtained from reaction of 1-pentanol with Cro₃, H₂o, H₂SO₄.
What do reactants and products consist of?Reactants are the chemical substances that take part in chemical reactions to create new substances, or products. Chemical reactions between reactants produce new substances, which are referred to as products.
Chemical reactions are the transformation of one or more reactants into one or more new products. Materials are composed of chemical building blocks or compounds. Various products are created by rearranging the atoms that make up the reactants in a chemical reaction.
A chemhttps://brainly.com/question/29039149als into one or more other chemicals. Rust, for instance, is produced when iron and oxygen come together. Sodium acetate, carbon dioxide, and water are produced when vinegar and baking soda are mixed.
chemical reaction is attached below
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In the compound [Ag(NH3)2]Cl, what is the ligand? ?Ag, Cl, NH3 or [Ag(NH3)2]+ ?
This complex's ligands, ammonia and chloride, are known as diamine silver (I) chloride.
In chemistry, what is a ligand?An ion or molecule that gives a pair of electrons to the main metal atom or ion to create a coordination complex is known as a ligand. The Latin origin of the word ligand is "knot or bind," as in a binding. A ligand could be a neutral chemical, an ion, or a cation.
What 3 categories of ligands are there?In a coordination complex, the atoms or molecules known as ligands attach to the central metal atom. Three categories of ligands—simple, complex, and coordinative unsaturation—can be used to categorize them.
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Rank the elements highlighted in the figure based on increasing size of their atoms. Orange green gray red blue
The presence of more electron shells and electron shielding causes atomic size to rise as you descend a column. Because of more protons, atomic size shrinks as you move to the right across a row. Samantha, one of Test Prep Academy's tutors, wrote this essay specifically for you.
What is atoms?One or more electrons are attached to the nucleus of every atom, which is made up of a nucleus. Protons and neutrons, in various numbers, make up the nucleus. Neutrons exist only in the most prevalent type of hydrogen. Atoms that are neutral or ionized are the building blocks of all solids, liquids, gases, and plasma. A chemical element's atom is a particular type of particle of substance. The core nucleus of an atom is surrounded by either many negatively charged electrons or a positively charged electron.Chemical reactions cannot split apart or form atoms, which are unbreakable particles. Atoms of one element share the same chemical properties and mass with all other atoms, however the chemical properties of atoms of other elements vary.To learn more about atoms, refer to:
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Which of the following steps of translation does NOT specifically require the hydrolysis of GTP? a)the peptidyl transferase reaction b)release of EF-Tu from the aminoacyl-tRNA inserted at the A site c)the movement of the ribosome one codon toward the 3′ end of the mRNA d)dissociation of certain release factors during termination
"The movement of the ribosome one codon toward the 3′ end of the mRNA" does NOT specifically require the hydrolysis of GTP.
What is hydrolysis?Any chemical reaction in which a molecule of water breaks one or more chemical bonds is referred to as hydrolysis. The word refers to substitution, elimination, and solvation processes in which water serves as the nucleophile. A chemical process in which water is utilized to break down a substance; this is accomplished by introducing a water molecule across a covalent link in the component. A hydrolysis reaction is the dissolution of a salt of a weak acid or base in water. Strong acids can be hydrolyzed as well. For example, dissolving sulfuric acid in water yields hydronium and bisulfate.
Here,
"The migration of the ribosome one codon nearer the 3′ end of the mRNA" does NOT necessitate GTP hydrolysis.
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The physical state(s) present when a substance is melting is (are) a) solid. B) liquid. C) gas_ D) solid + liquid. E) liquid gas:
Option B is the correct option means solid and liquid. Both physical states are present in this melting process
What is a substance?A substance is a class of materials that has a certain makeup. They have particular characteristics and cannot be physically divided into its chemical components. Sodium chloride and sugar are two examples. A chemical substance is a type of matter with a predictable chemical composition and physical characteristics.According to some references, it is also impossible to physically separate a chemical compound into its component parts without first destroying any chemical bonds. Matter with a definite composition and set of characteristics is referred to as a substance. A substance is every pure element. It is a material when it is pure. Substance examples: Because iron is an element, it is also a substance.
Hence, The physical state(s) present when a substance is melting is (are) a) solid is solid and liquid.
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The partial pressure of F2 and a mixture of gases were the total pressure is one ATM. What is the mole fraction of F2?
The partial pressure of F2 and a mixture of gases where the total pressure is one atm. The mole fraction of F2 is 0.394736.
What is mole fraction ?
The term mole fraction is defined as the number of molecules of a component in a mixture is divided by the total number of moles in the given mixture.
Total pressure = 1 atm
= 760 torr
Then,
The partial pressure of F2 = 300 torr
The mol fraction of F2 = PF2/PT
= 300/760
= 0.394736
Thus, The partial pressure of F2 and a mixture of gases where the total pressure is one atm. The mole fraction of F2 is 0.394736.
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Which of the following individuals would likely have the best chance of survival in a green forest environment?
a dark brown mouse
a green stick insect
a brightly-colored butterfly
a red dragonfly
Answer:
a green stick insect
Explanation:
it can meddle into the green trees when it sees is hunter it hides
hope this was helpful
What is the material in the container?
A. a compound
B. a mixture consisting of two compounds
C. a mixture of an element and a compound
D. a mixture consisting of two elements
The material that is located inside the container is a mixture consisting of two compounds. That is option B.
What is a compound?A compound is defined as a chemical substance that is composed of identical molecules consisting of atoms of two or more chemical elements and which are chemically combined together.
In the above mixture there are two different compounds that are chemically combined together through Chemical bonds. That is compounds of blue and red colour.
Therefore the mixture represented above is a mixture consisting of two compounds.
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Answer:
Its D
Explanation:
A mixture consisting of two elements
Can someone please help me with my chemistry homework “Covalent Bonds Practice 2” [picture is down bellow]
The formation of molecule can easily be shown by drawing Lewis dot structure. Therefore, in the below given ways we can draw the Lewis dot structure.
What is Lewis dot structure?Lewis dot structure is a way to represent the valence electron of an element in the form of dot. These are mainly beneficial in understanding the chemical formula of covalent compound.
Steps to draw Lewis dot structure of CO[tex]_2[/tex]:
The entire quantity of valence electrons should be known. Total number of electrons= 16
Draw single bonds from the core atom to other atoms while placing the lowest electronegative element in the middle.
Identify the number of additional electrons the core element needs.
Increase the core atom's double or triple bonds until it possesses a complete octet.
until the outer elements have complete octets, add electrons to them.
O=C=O
Therefore, in the above given ways we can draw the Lewis dot structure.
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Classify each reaction as an exchange reaction, a condensation reaction, or a cleavage reaction.
Drag the appropriate items to their respective bins
The given reactions are of following types:
1. exchange
2. exchange
3. exchange
4.condensation
5. cleavage
Most chemical reactions can be classified into one or more of five basic types: Acid-base reaction, exchange reaction, condensation reaction, cleavage reaction, redox reaction. Condensation reactions occur when one or more compounds combine to form a complex compound. Cleavage reactions are the opposite of synthesis reactions. In fission reactions, more complex compounds are broken down into a few simpler compounds. An exchange reaction is a type of redox reaction in which one element in a compound is replaced by another. Displacement and double displacement reactions are also termed as exchange reactions as a part of ionic compounds is exchanged. Reaction 1, 2, 3 is thus a exchange reaction as the follow the same nature. Reaction 4 is condensation reaction while reaction 5 is a cleavage reaction.
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The complete question is
Classify each reaction as an exchange reaction, a condensation reaction, or a cleavage reaction.
1. 2NH4CL+Ba(NO3)2-->2NH4NO3+BaCl2 -- ( --?-- )
2. HCl+NaOH---> NaCl+ H2O –
3. Ca+2HCl---> CaCl+H2 --
4. CaO+CO2--->CaCO3 -- ( --?-- )
5. 2H2O-->2H2+O2 --
What is the generic structure of a soap? Explain how soap forms in this reaction. If anhydrous methanol is used, how is water getting into the system? Summarize vour observations from the burn tests on gasoline and hindiesel mar
The generic structure of a soap is a long-chain fatty acid salt, typically consisting of a carboxylate group (-COO-) and a long hydrocarbon tail.
Soaps are typically made by the process of saponification, which is the reaction of a fat or oil (such as vegetable oil or animal fat) with a strong base (such as lye or NaOH) to produce glycerol and the salt of a long-chain fatty acid. The saponification reaction can be represented by the following equation:
Fat or oil + NaOH → Glycerol + Soap (salt of a long-chain fatty acid). If anhydrous methanol is used, water is not added directly to the system. However, methanol is a good solvent for water, so if the reaction mixture contains traces of water, it could dissolve in the methanol and be present in the system.
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Predict the major product(s) you would obtain from sulfonation of the following compounds:
(a) Fluorobenzene
(b) m -Bromophenol
(c) m -Dichlorobenzene
(d) 2,4 -Dibromopheno
A sulfonic acid functional group is added to the molecule during the process of sulfonation. Aromatic sulfonation occurs when the sulfonic acid group is added to aromatic compounds.
Fluorine raises the electron density at the ring by mesomeric action and is an ortho and para directing group, leading to the formation of p-fluorobenzene-sulfonic acid and o-fluorobenzene-sulfonic acid during the sulfonation of fluorobenzene. Since substitution between two groups seldom happens, both -OH and -Br are ortho and para directed, resulting in the formation of the two products 2-Bromo-4-hydroxybenzenesulfonic acid and 4-Bromo-2-hydroxybenzenesulfonic acid. As -Cl is an ortho and para directing group, 2,4-Dichlorobenzene-sulfonic acid results from the sulfonation of m-dichlorobenzene. 2,4-Dibromophenol is sulfonated to produce 3,5-Dibromo-2-hydroxybenzenesulfonic acid as the end product.
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