The empirical formula is C3H4.
The empirical formula of mesitylene can be found using the data provided in the problem statement.Let's write the balanced combustion reaction for mesitylene first:2 C9H12 + 25 O2 → 18 CO2 + 12 H2OThe molar mass of the compound (C9H12) can be calculated as follows:9 moles of carbon × 12 g/mol = 108 g/mol12 moles of hydrogen × 1 g/mol = 12 g/molMolar mass of the compound = 108 + 12 = 120 g/molThe amount of CO2 produced is 0.379 g and the amount of H2O produced is 0.1035 g.Moles of CO2 produced = 0.379 g / 44 g/mol = 0.0086 molesMoles of H2O produced = 0.1035 g / 18 g/mol = 0.00575 molesUsing the balanced chemical equation, we can calculate the moles of C9H12 required to produce these amounts of CO2 and H2O. Since we know that the ratio of carbon to water in the compound is 9:12, we can determine the number of moles of each element present in the compound.Moles of C9H12 required = (0.0086 mol CO2 × 2 mol C9H12) / 18 mol CO2 = 0.00096 mol C9H12Moles of carbon = 0.00096 mol C9H12 × 9 mol C / mol C9H12 = 0.00864 mol C9H12Moles of hydrogen = 0.00575 mol H2O × 2 mol H / mol H2O = 0.0115 mol HUsing the mole ratios, we can find the empirical formula:Moles of carbon = 0.00864 mol C9H12 × (1 mol / 0.00864 mol) = 1 mol C9H12Moles of hydrogen = 0.0115 mol H / 0.00864 mol = 1.33 mol H9 carbon atoms and 12 hydrogen atoms are present in one molecule of C9H12. To convert this to an empirical formula, we need to divide by the greatest common factor (GCF), which is 3. Therefore, the empirical formula is C3H4.
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Characteristics that are used to help identify an object are called
What is the Ka of a 0.0981 M
solution of hydrocyanic acid
(HCN) with a pH of 6.00?
Ka = [?] x 10!?)
Answer:
Attached picture
Ka = [?] x 10
1.02 x 10^-11 = [?] x 10
[?] = 1.02 (I'm assuming you're asking this)
(If not then divide the 10)
Answer:
The answer is 1.02x10^-11
Explanation:
Fill in the box 1.02 and then -11
Rank the following fatty acids a coording to their melting point, from highest melting point to lowest melting point. Rank from highest melting point to lowest melting point. To rank items as equivalent, overlap them.
The ranking of the given fatty acids according to their melting point is Stearic acid > Palmitic acid > Lauric acid > Myristic acid > Oleic acid > Linoleic acid.
1. Stearic acid: Stearic acid has a long chain of 18 carbon atoms with no double bonds, resulting in a tightly packed structure. It has the highest melting point among the given fatty acids.
2. Palmitic acid: Palmitic acid also has a long chain of 16 carbon atoms with no double bonds. While it is slightly shorter than stearic acid, it still has a high melting point.
3. Lauric acid: Lauric acid contains 12 carbon atoms and no double bonds. It has a slightly lower melting point compared to palmitic acid and stearic acid.
4. Myristic acid: Myristic acid consists of 14 carbon atoms and no double bonds. It has a slightly lower melting point compared to lauric acid.
5. Oleic acid: Oleic acid is an unsaturated fatty acid with one double bond, located at the 9th carbon atom. It has a lower melting point compared to the saturated fatty acids listed above.
6. Linoleic acid: Linoleic acid is a polyunsaturated fatty acid with two double bonds, located at the 9th and 12th carbon atoms. It has the lowest melting point among the given fatty acids due to the presence of multiple double bonds, which disrupt the packing of the fatty acid chains.
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Describe reflection, refraction, and absorption.
Answer:
Refraction is the bending of a wave when it enters a medium where its speed is different, like going from the air (gas) to a glass of water (liquid). Absorption is when light energy penetrates an object. Typically this energy is then converted to heat.
The periodic table of the elements lists the elements in order of increasing atomic number. Each element has its own unique square in the periodic table. Numbers in an element's square are used to tell how many protons, neutrons and electrons a typical atom of each element has.
Based on the information shown, which is true about chlorine atoms?
Answer:
Every Chlorine atom has an atomic mass of 35.45u and 17 protons and electrons.
Explanation:
this can all be figured out looking at the atomic number in the top left corner and the mass is found at the bottom.
this is due in five mintues please help
Answer:
5
Explanation:
Na, N, O, O, O
Anita made a frozen treat to eat on a hot day by pouring juice into an ice cube tray and putting the tray in the freezer. When she took it out of the freezer a few hours later, the juice was frozen. Select the phrases from the drop-down lists to correctly complete the sentences. When Anita took the tray out of the freezer, the frozen juice was made of 1. A. the same substance as before because the types of atoms 2. D. stayed the same . A 3. F. physical change occurred.
Answer:
physical change occured
Explanation:
it is still juice
10,000,000
pH=0
Battery Acid
Concentrated Hydrofluoric Acid
1,000,000
pH=1
Hydrochloric acid secreted
by stomach lining
100,000
pH=2
Lemon juice
Gastric acid
Vinegar
10,000
pH=3
Grapefruit
Orange juice
Soda
1,000
pH=4
Acid rain
Tomato juice
100
pH=5
Soft drinking water
Black coffee
10
pH=6
Urine
Saliva
1
pH=7
Pure water
1/10
pH=8
Sea water
1/100
pH=9
Baking soda
1/1,000
pH=10
Great Salt Lake
Milk of magnesia
1/10,000
pH=11
Ammonia solution
1/100,000
pH=12
Soapy water
1/1,000,000
pH=13
Bleaches
Oven cleaner
1/10,000,000
pH=14
Liquid drain cleaner
Many common household substances may be classified as acids or bases. According to the pH scale,
A)
baking soda is a weak base while bleach is a strong base.
B)
coffee is a weak acid while drain cleaner is a strong acid.
C)
oven cleaner is a weak acid while battery acid is a strong acid.
D)
soft drinking water is a weak base while soapy water is a strong base
Based on the given pH scale, we can only conclude that baking soda is a weak base (option A).
According to the given pH scale, we can determine the strengths of various substances as acids or bases. Let's analyze each option:
A) Baking soda is listed with a pH of 9, which indicates it is a weak base. Bleach is not specifically mentioned in the given pH scale, so we cannot determine its classification based on the information provided. Therefore, option A cannot be concluded.
B) Coffee is listed with a pH of 4, indicating it is a weak acid. Drain cleaner is listed with a pH of 14, which suggests it is a strong base. Thus, option B is incorrect.
C) Oven cleaner is not specifically mentioned in the given pH scale, so we cannot determine its classification. Battery acid, on the other hand, is listed with a pH of 0, which indicates it is a strong acid. Therefore, option C cannot be concluded.
D) Soft drinking water is listed with a pH of 5, indicating it is a weak acid. Soapy water is not specifically mentioned, so we cannot determine its classification based on the information provided. Hence, option D is incorrect.
In summary, based on the given pH scale, we can only conclude that baking soda is a weak base (option A). The information provided does not allow us to determine the strengths of bleach, oven cleaner, or soapy water.
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Note- The question seems to be incomplete and the complete question isn't available in the search engine.
Se mezclan 20 gramos de agua (1cal/g°C) a 40 °C con 15 gramos de alcohol (0,58cal/g°C) a 30 °C. ¿Cuál ha sido la temperatura de equilibrio térmico?
Answer:
[tex]T_{EQ}=37\°C[/tex]
Explanation:
¡Hola!
En este caso, para los problemas de equilibrio térmico, consideramos que la energía liberada por la sustancia que inicialmente está caliente (agua), es absorbida por la sustancia que inicialmente está fría (alcohol); thus, we can write:
[tex]Q_{agua}=-Q_{alcohol}[/tex]
La cual puede ser escrita en términos de masa, calor specifico y temperaturas:
[tex]m_{agua}C_{agua}(T_{EQ}-T_{agua})=-m_{alcohol}C_{alcohol}(T_{EQ}-T_{alcohol})[/tex]
De este modo, al resolver para la temperature de equilibrio térmico, obtenemos la siguiente expresión:
[tex]T_{EQ}=\frac{m_{agua}C_{agua}T_{agua}+m_{alcohol}C_{alcohol}T_{alcohol}}{m_{agua}C_{agua}+m_{alcohol}C_{alcohol}}[/tex]
Así, al reemplazar los valores en esta, obtenemos:
[tex]T_{EQ}=\frac{(20g)(1cal/g\°C)(40\°C)+(15g)(0.58cal/g\°C)(30\°C)}{(20g)*(1cal/g\°C)+(15g)(0.58cal/g\°C)} \\\\T_{EQ}=37\°C[/tex]
¡Saludos!
Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely to not be a gas at room temperature? A CL2, B HCL, C LiCL, D H2, E CH4.
Molecular compounds of low molecular weight tend to be gases at room temperature. LiCl is most likely to not be a gas at room temperature. The correct answer is C.
LiCl is a salt, which is an ionic compound. Ionic compounds are held together by strong electrostatic forces between the oppositely charged ions.
These forces are much stronger than the forces that hold together molecular compounds, which are held together by covalent bonds. As a result, ionic compounds have much higher melting and boiling points than molecular compounds.
At room temperature, LiCl is a solid. It has a melting point of 613 degrees Celsius and a boiling point of 1360 degrees Celsius.
The other compounds listed in the question are all molecular compounds. They have much lower melting and boiling points than LiCl. At room temperature, they are all gases.
Cl₂ has a melting point of -101 degrees Celsius and a boiling point of -34 degrees Celsius.
HCl has a melting point of -85 degrees Celsius and a boiling point of -85 degrees Celsius.
H₂ has a melting point of -259 degrees Celsius and a boiling point of -253 degrees Celsius.
CH₄ has a melting point of -182 degrees Celsius and a boiling point of -164 degrees Celsius.
Therefore, the correct option is C, LiCl.
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Which of the following statement is not true?
Answer: 2
Explanation: Greenhouse gases are very important in keeping our planet just right. If we have too many Greenhouse gases it would be too hot, but we can't eliminate all of them or it will be too cold
Complete the equilibrium reactions which are pertinent to an aqueous solution of Ag2CO3. Physical states are optional. dissociation of AgCO3 : Ag2CO3(s)↽−−⇀ dissociation of H2CO3 : H2CO3(aq)+H2O(l)↽−−⇀ dissociation of HCO−3 : HCO−3(aq)+H2O(l)↽−−⇀ dissociation of H2O : 2H2O(l)↽−−⇀
The equilibrium reactions for an aqueous solution of [tex]Ag_{2}CO_{3}[/tex] involve the dissociation of silver carbonate, carbonic acid, bicarbonate ion, and water, resulting in the formation of silver ions, carbonate ions, hydrogen ions, bicarbonate ions, hydronium ions, and hydroxide ions.
The dissociation reactions pertinent to an aqueous solution of [tex]Ag_{2}CO_{3}[/tex](silver carbonate) can be represented as follows:
1. Dissociation of [tex]Ag_{2}CO_{3}[/tex]:
[tex]Ag_{2}CO_{3}[/tex](s) ⇌ [tex]2Ag[/tex]⁺(aq) + [tex]CO_{3}[/tex]²⁻(aq)
In this reaction, solid silver carbonate dissociates into silver ions ([tex]Ag[/tex]⁺) and carbonate ions ([tex]CO_{3}[/tex]²⁻) in the aqueous solution.
2. Dissociation of [tex]H_{2}CO_{3}[/tex](carbonic acid):
[tex]H_{2}CO_{3}[/tex](aq) ⇌ [tex]H[/tex]⁺(aq) + [tex]HCO_{3}[/tex]⁻(aq)
Carbonic acid, when dissolved in water, forms hydrogen ions ([tex]H[/tex]⁺) and bicarbonate ions ([tex]HCO_{3}[/tex]⁻).
3. Dissociation of [tex]HCO_{3}[/tex]⁻ (bicarbonate ion):
[tex]HCO_{3}[/tex]⁻(aq) ⇌[tex]H[/tex]⁺(aq) + [tex]CO_{3}[/tex]²⁻(aq)
The bicarbonate ion further dissociates into hydrogen ions (H⁺) and carbonate ions (CO₃²⁻).
4. Dissociation of [tex]H_{2}O[/tex](water):
[tex]2H_{2}O[/tex](l) ⇌ [tex]H_{3}O[/tex]⁺(aq) + [tex]OH[/tex]⁻(aq)
Water undergoes self-ionization to form hydronium ions ([tex]H_{3}O[/tex]⁺) and hydroxide ions ([tex]OH[/tex]⁻).
These equilibrium reactions describe the dissociation processes occurring in an aqueous solution of silver carbonate.
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using standard reduction potentials from the aleks data tab, calculate the standard reaction free energy ΔGD for the following redox reaction. round your answer to 3 significant digits.
I2 (s) + 6H20 (l) + 5Br2(l) --> 2IO3- (aq) + 12 H+ (aq) + 10 Br- (aq)
To calculate the standard reaction free energy (ΔG°) for the given redox reaction, we need to use the standard reduction potentials from the ALEKS data tab.
To calculate the standard reaction free energy (ΔG°) for the given redox reaction, we need to utilize the standard reduction potentials (E°) of the involved species. The ΔG° is related to the standard reduction potentials through the equation: ΔG° = -nFΔE°, where n represents the number of electrons transferred and F is the Faraday constant.
Let's analyze the reaction and identify the half-reactions to determine the number of electrons transferred.
Half-reaction 1: I2(s) + 2e- → 2I- (aq)
Half-reaction 2: Br2(l) + 2e- → 2Br- (aq)
Half-reaction 3: 6H2O (l) → 12H+ (aq) + 6e-
Half-reaction 4: 2IO3- (aq) + 12H+ (aq) + 10e- → I2 (s) + 6H2O (l)
By comparing the half-reactions, we can see that 5 electrons are transferred in the reaction.
For the oxidation reactions:
2IO3- (aq) + 12H+ (aq) + 10Br- (aq) → I2 (s) + 6H2O (l) + 5Br2 (l): coefficient = 1
Now we can calculate ΔGᴰ:
ΔGᴰ = (1 * E°(I2/I-)) + (5 * E°(Br2/Br-)) + (3 * E°(H2O/O2)) - (1 * E°(IO3-/H2O/Br2))
Substituting the values:
ΔGᴰ = (1 * 0.536 V) + (5 * 1.087 V) + (3 * 1.229 V
ΔE° = E°(half-reaction 4) - [E°(half-reaction 1) + E°(half-reaction 2) + E°(half-reaction 3)]
After obtaining ΔE°, we can calculate the standard reaction free energy (ΔG°) using the equation ΔG° = -nFΔE°. Since we know n = 5 and F is a constant, we can substitute these values into the equation to calculate ΔG°.
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Are these ramen noodles expired?
Answer:
i think so
Explanation:
just eat them anyways
Answer: Yes they are
Explanation: Where's the picture?
A gas mixture is made by combining 5.5 g each of Ar, Ne, and an unknown diatomic gas. At STP, the mixture occupies a volume of 70.31 L. What is the molar mass of the unknown gas? molar mass: g/mol Identify the unknown gas. OF2 B. 02 C. CI, D. H2 E. N2
H2 is the unknown gas if a gas mixture is made by combining 5.5 g each of Ar, Ne, and an unknown diatomic gas and at STP, the mixture occupies a volume of 70.31 L.
Why is there volume in gas?
Because their molecules are very loosely packed, contain wide intermolecular gaps, and move about, gases lack a distinct shape or volume. Because there is little to no attraction between molecules, gases can take on any shape or volume.
One mole of gas will take up 22.4 litres at typical conditions (0 °C and 1 atm). No matter what kind of petrol is being used, this is true. Since the relationship between volume and the number of moles of a gas is linear, two moles of any gas at STP should have twice the volume of one mole.
The total number of moles of Ar, Ne, and unknown gas, each with a mass of 7g, in the gas mixture is
= (5.5/40 + 5.5/20 + 5.5/m) mol
Total volume of all gases at STP:
(5.5/40 + 5.5/20 + 5.5/m) mol * 22.4 L/(mol) = 70.31L
(5.5/40 + 5.5/20)+ 5.5/m = 70.31L/ 22.4L
5.5/m = 3.19 -0.4125
m = 1.98 ≈ 2g/mol i.e. H2
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. can steam distillation of ethanol be done? why or why not?
Yes, steam distillation of ethanol can be done. Steam distillation is a technique used to separate volatile compounds from non-volatile or less volatile substances. Ethanol is a volatile compound with a boiling point of approximately 78.4 °C.
In steam distillation, the mixture containing the volatile compound (in this case, ethanol) is heated, and steam is passed through the mixture. The steam carries the volatile compound along with it, and the mixture is then condensed to separate the volatile compound from the non-volatile components.
Ethanol forms an azeotropic mixture with water, meaning that the boiling point of the mixture is lower than the boiling points of the individual components. In the case of ethanol-water mixture, the boiling point of the azeotropic mixture is around 78.2 °C, slightly lower than pure ethanol. This azeotropic behavior actually facilitates the steam distillation process of ethanol because the steam carries along the ethanol vapor more effectively.
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Which of the following accurately describes the primary species in solution at point A on the titration curve for the titration of HF with NaOH? pH A) HF D B) HF and OH C) OH B D) F mL OH-
At point A on the titration curve for the titration of HF with NaOH, the primary species in the solution is HF.
This is because at the beginning of the titration before any NaOH is added, the solution consists primarily of the acid being titrated, which in this case is HF.
As NaOH is slowly added, it reacts with HF in a 1:1 stoichiometric ratio to form water and the conjugate base of HF, F-. However, at point A, the amount of NaOH added is still very small, so the majority of the original HF remains unreacted.
The presence of OH- ions from NaOH is not significant enough at this point to affect the overall pH of the solution. Therefore, the primary species at point A is HF.
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You weigh out 0.1183 g of a complex salt to analyze for the percentage of cyanide ion in your complex salt. After dissolving the complex salt in solution, you determine that it takes 10.02 mL of a 0.08035 M potassium permanganate solution to react with all of the cyanide ion in your complex salt. Using the balanced chemical equation provided, determine the mass percentage of the cyanide ion in your complex salt. (Remember: the mole ratio of MnO4 - to KMnO4 is 1:1)
Answer:
25.35%
Explanation:
Again let me restate the the equation of the reaction;
H2O (ℓ) + 2 MnO4 - (aq) + 3 CN- (aq) → 2 MnO2 (s) + 3 CNO- (aq) + 2 OH- (aq)
Amount of potassium permanganate reacted = 10.2/1000 * 0.08035 = 8.1957 * 10^-4 moles
If 2 moles of MnO4 - reacts with 3 moles of CN-
8.1957 * 10^-4 moles of MnO4 - reacts with 8.1957 * 10^-4 * 3/2
= 1.229 * 10^-3 moles of CN-
Mass of CN- reacted = 1.229 * 10^-3 moles of CN- * 26.02 g/mol
= 0.03 g
Hence, percentage of the cyanide = 0.03 g/0.1183 g * 100
= 25.35%
Mass number symbol =
Answer:
A is the symbol of mass number.
Explanation:
→ Mass number (A) = Protons + Neutrons
It is the required formula. The symbol of the mass number is A.
Answer:
The letter A
Explanation:
The mixtures of sodium carbonate and calcium nitrate react to participate calcium carbonate and sodium nitrate. This reaction is shown by which balanced chemical equation?
Explanation:
Na2CO3+Ca(No3)2---> CaCO3+2NaNo3
if you wish to observe features that are around the size of atoms, say 6.5 × 10-10 m, with electromagnetic radiation, the radiation must have a wavelength of about the size of the atom itself. (a) What is its frequency? (b) What type of electromagnetic radiation might this be?
(a) The frequency of electromagnetic radiation required to observe features around the size of atoms is approximately 4.6 × 10⁻¹⁹ Hz, (b) This type of electromagnetic radiation might be X-rays.
The relationship between the wavelength is (λ), frequency is (ν), and the speed of light is (c) is given by the equation c = λν. The atom size and the size of the wavelength should be same. Therefore, λ ≈ 6.5 × 10⁻¹⁰ m. Now, rearranging and solving,
ν = c/λ
ν = (3×10⁸m/s)/(6.5×10⁻¹⁰m)
ν ≈ 4.6 × 10¹⁹ Hz
Hence, the frequency of electromagnetic radiation required to observe features around the size of atoms is approximately 4.6 × 10¹⁹ Hz. This is X-rays.
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Homeostasis refers to
A.
the similarity of genetic traits to one another.
B.
a mixture or solution that is the same throughout.
C.
the tendency of a cell to maintain a stable internal environment.
D.
the effect of natural selection on human evolution.
NEED HELP QUICK!!!!!!!!
Answer:
(C)
the tendency of a cell to maintain a stable internal environment.
Answer:
Homeostasis refers to C. the tendency of a cell to maintain a stable internal environment.
Given that there are more possible combinations for amino acids than amino acids themselves, what does this imply about the number of codes for each amino acid?
The fact that there are more possible combinations for amino acids than the number of amino acids themselves implies that each amino acid can be encoded by multiple codons.
A codon is a sequence of three nucleotides in DNA or RNA that corresponds to a specific amino acid.
There are 20 standard amino acids used to build proteins in living organisms. However, there are 64 possible three-letter combinations of nucleotides (4³) that can be used to form codons. This means that on average, there are more than three codons that can encode each amino acid.
To calculate the number of codons per amino acid on average, we divide the total number of codons (64) by the number of amino acids (20). Therefore, the average number of codons per amino acid is 64/20 = 3.2.
This indicates that there is a degeneracy or redundancy in the genetic code, where multiple codons can specify the same amino acid.
For example, the amino acid leucine is encoded by six different codons (UUA, UUG, CUU, CUC, CUA, CUG), while methionine and tryptophan are each encoded by a single codon.
In conclusion, the existence of more possible combinations for amino acids than amino acids themselves means that the genetic code is degenerate, allowing for redundancy and flexibility in protein synthesis.
This redundancy helps to protect against errors in DNA replication and transcription and allows for evolution to occur through the accumulation of genetic variations.
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1 MLR3 → 1 MR + 1 LR2
If 23.5 grams of MLR3 react, how many moles of MR are produced?
How are traits passed down through generations?
28. A runner completes a 10 km run in about 30 minutes. What was the runner's average
speed in km/h? Hint: (60 minutes = 1 hr)
a. 10 km/hr
c. 20 km/hr
b. 15 km/hr
d. 30 km/hr
Answer:
20 km/h
Explanation:
Speed = distance ÷ time
Speed = 10 ÷ 0.5 hours
Speed = 20 km/hr
What process will occur if an error is made during DNA replication, resulting in a slight change to the structure of a gene?
Answer:
Mutation
Explanation:
Mutation refers to the change in the structure of a gene. This change occurs when changes are made in the base/nucleotide sequence on a gene.
An example of such error made during DNA replication are incorrectly paired nucleotides or insertion/deletion of nucleotides during replication.
If HCl is a weaker acid than HI, why is ClCH2COOH a stronger acid than ICH2COOH?
a.)Because Cl is more electronegative than I.
b.)Because ICH2COO− is more stable than ClCH2COO−
c.)Because the size of Cl atom is greater than the size of I atom.
d.)Because I− is more stable than Cl−
The correct option is A. Because Cl is more b electronegative than I.
Both ICH2COOH and ClCH2COOH are members of the carboxylic acid family. The acidity of carboxylic acids is generated by their carboxyl group (-COOH). When it comes to acidity, there are numerous factors to consider. The acidity of a carboxylic acid is determined by its carboxyl group and the substituents on the carbon atom adjacent to the carboxyl group. In the case of carboxylic acids, the strength of the acid increases as the substituents on the carbon atom adjacent to the carboxyl group become increasingly electron-withdrawing or electronegative.
A carboxylic acid with a strong electron-withdrawing substituent on the adjacent carbon atom is more acidic than a carboxylic acid with a weak electron-withdrawing substituent on the adjacent carbon atom. When we look at the two molecules, ICH2COOH and ClCH2COOH, we see that they have the same chemical structure except for the halogen substituent. The electronegativity of Cl is more than that of I, which means that Cl is more electron-withdrawing than I. As a result, ClCH2COOH has a stronger electron-withdrawing group attached to it, making it a stronger acid than ICH2COOH. Therefore, the correct option is A. Because Cl is more electronegative than I.
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help cococococo cococococo doing this for the points or whatever it is cococo
Answer:
what is cocococococo?
Explanation:
isnt it like a plant for choclate?
Answer:
hhhhhhhh
Explanation:
A sample of 0.2140 g of an unknown monoprotic acid was dissolved in 25.0 mL of water and titrated with 0.0950 M NaOH. The acid required 27.4 mL of base to reach the equivalence point.
What is the molar mass of the acid?
After 15.0 mL of base had been added in the titration, the pH was found to be 6.50. What is the Ka for the unknown acid?
The molar mass of the acid is 82.0 g/mol. The Ka of the unknown acid is 1.69 × 10⁻⁶.
How to determine molar mass and Ka?Molar mass of the acid:
The molar mass of the acid can be calculated using the following equation:
Molar mass = mass / moles
The mass of the acid is 0.2140 g and the moles of the acid can be calculated using the following equation:
moles = volume × concentration
The volume of NaOH used to reach the equivalence point is 27.4 mL and the concentration of NaOH is 0.0950 M.
moles of NaOH = 27.4 mL × 0.0950 M = 2.613 mmol
Since the acid and NaOH react in a 1:1 ratio, the moles of the acid is also 2.613 mmol.
Substituting these values into the first equation:
Molar mass = 0.2140 g / 2.613 mmol = 82.0 g/mol
Ka for the unknown acid:
The Ka for the unknown acid can be calculated using the following equation:
Ka = [H⁺][A⁻] / [HA]
where:
Ka is the acid dissociation constant
[H⁺] is the concentration of hydrogen ions
[A⁻] is the concentration of the conjugate base
[HA] is the concentration of the acid
The concentration of hydrogen ions can be calculated using the pH. The pH of the solution after 15.0 mL of base had been added is 6.50.
pH = -log[H⁺]
6.50 = -log[H⁺]
[H⁺] = 10^-6.50
[H⁺] = 3.162 × 10⁻⁷ M
The concentration of the conjugate base can be calculated using the following equation:
[A-] = moles of A- / volume of solution
The moles of A⁻ = the moles of NaOH added after 15.0 mL, which is 1.438 mmol. The volume of the solution is 25.0 mL + 15.0 mL = 40.0 mL.
[A⁻] = 1.438 mmol / 40.0 mL
[A⁻] = 3.595 × 10⁻³ M
The concentration of the acid can be calculated using the following equation:
[HA] = moles of HA / volume of solution
The moles of HA = the moles of acid, which is 2.613 mmol. The volume of the solution is 40.0 mL.
[HA] = 2.613 mmol / 40.0 mL
[HA] = 6.532 × 10⁻³ M
Substituting these values into the Ka equation:
Ka = (3.162 × 10⁻⁷ M)(3.595 × 10⁻³ M) / (6.532 × 10⁻³ M)
Ka = 1.69 × 10⁻⁶
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