A 0.284-mol sample of hx is dissolved in enough h2o to form 778.9 ml of solution. if the ph of the solution is 3.68, what is the ka of hx?
Answers
The ka of hx is 5.04 x 10⁻⁶. We can solve this through disssociation of hx in water.
The first step is to write the equation for the dissociation of HX in water:
HX + H₂O ⇌ H₃O⁺ + X⁻
The equilibrium constant expression for this reaction is:
Ka = [H₃O⁺][X⁻]/[HX]
We need to determine the concentration of H₃O⁺ and X⁻in the solution. Since the pH is given, we can use the following equation to determine the H₃O+ concentration:
pH = -log[H₃O⁺]
Solving for [H₃O⁺], we get:
[H₃O⁺] = 10\(^{(-pH)}\) = 10\(^{(-3.68)}\) = 4.28 x 10⁻⁴ M
Since HX is a weak acid, we can assume that the concentration of HX is equal to the initial concentration, which is given as:
[HX] = 0.284 mol/0.7789 L = 0.364 M
To determine the concentration of X-, we use the fact that the solution is electrically neutral, so the concentration of X- is equal to the concentration of H₃O⁺
[X-] = [H₃O⁺}= 4.28 x 10⁻⁴ M
Now we can plug these concentrations into the equilibrium constant expression and solve for Ka:
Ka = [H₃O⁺][X-]/[HX] = (4.28 x 10⁻⁴)² / 0.364 = 5.04 x 10⁻⁶
Therefore, the Ka of hx is 5.04 x 10⁻⁶.
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Related Questions
Select the best answer for the question.
13. A reversible reaction has an equilibrium constant of 0.75. If the forward rate constant is 0.62 mol/L/s, what's the
reverse reaction rate constant?
A. 1.210
B. 0.827
O C. 0.910
D. 1.010
Answers
Answer:
B
Explanation:
The rate constant is equal to forward rate divided by reverse rate.
K = f/r
-> r = f/K
0.62/0.75 = 0.8267
Answer:
its B
Explanation:
I TOOK THE TEST
En la reacción química del cloruro de metilo (CH3Cl) se encontró que el cambio total de reacción ante cuya concentración era 0,0386 mol/L se llevó acabo en 15 seg ¿Cuál es su velocidad de reacción en mol/L. S y en g/L. S?
Answers
The question asks for the calculation of the reaction rate of the chemical reaction of methyl chloride (CH3Cl) given the initial concentration of 0.0386 mol/L and the time of 15 seconds to complete the reaction. The reaction involves the formation of CH3Cl from CH3OH and HCl. Using the stoichiometry of the reaction and the concentration change of CH3OH over time, the reaction rate is calculated as -Δ[CH3OH]/Δt, which represents the rate of decrease in the concentration of CH3OH. The result is a rate of 0.0386 mol/L.s and a final concentration of CH3Cl of -0.5404 mol/L, which suggests that the reaction may not be feasible under the given conditions due to the lack of reactants and the formation of other products.
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How many bromide ions are there in 2.00g of MgBr2?
Answers
There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).
The chemical formula of magnesium bromide (\(MgBr_2\)) contains one magnesium ion (\(Mg2^+\)) and two bromide ions (Br-). To find the number of bromide ions in 2.00 g of \(MgBr_2\), we need to use the molar mass of \(MgBr_2\) to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound, then use the stoichiometry of the chemical formula to determine the number of bromide ions present. First, we need to calculate the molar mass of \(MgBr_2\). The molar mass of \(MgBr_2\) is equal to the sum of the atomic masses of magnesium (Mg) and two bromine (Br) atoms. The atomic mass of Mg is 24.31 g/mol, and the atomic mass of Br is 79.90 g/mol. Molar mass of \(MgBr_2\) = 24.31 g/mol + (2 x 79.90 g/mol) = 184.11 g/mol Next, we can use the molar mass to determine the number of moles of \(MgBr_2\) present in 2.00 g of the compound: Number of moles of \(MgBr_2\) = mass of \(MgBr_2\) / molar mass of \(MgBr_2\)= 2.00 g / 184.11 g/mol
= 0.0109 mol Finally, we can use the stoichiometry of the chemical formula to determine the number of bromide ions present: Number of bromide ions = 2 x number of moles of \(MgBr_2\)
= 2 x 0.0109 mol
= 0.0218 mol Therefore, there are 0.0218 moles of bromide ions in 2.00 g of \(MgBr_2\). To convert this to the number of bromide ions, we can multiply by Avogadro's number (6.02 x 1023): Number of bromide ions = 0.0218 mol x 6.02 x 1023 ions/mol = 1.31 x 1022 ions
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If 45.0 liters of oxygen is measured at 24.0C, what would be its volume at standard temperature?
giving brainlist to best answer that shows work!!!!
Answers
The volume of the oxygen gas at standard temperature is 41.36 liters.
The given parameters;
initial volume of oxygen, V₁ = 45 Ltemperature of oxygen, T₁ = 24 ⁰C = 297 Kstandard temperature, T₂ = 0 ⁰C = 273 KThe volume of the oxygen gas at standard temperature is determined by applying Charles law as shown below;
\(\frac{V_1}{T_1} = \frac{V_2}{T_2} \\\\V_2 = \frac{V_1 T_2}{T_1} \\\\V_2 = \frac{45 \times 273}{297} \\\\V_2 = 41.36 \ L\)
Thus, the volume of the oxygen gas at standard temperature is 41.36 L.
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Which element is classified as a noble gas? HURYYYY PLSSSSSSSS!!!!!!!!!
O
N
CI
Xe
Answers
Answer:
Xe that is xenon
Explanation:
Xe that is xenon
Reason:
Xenon is a member of the zero-valence elements that are called noble or inert gases. It is inert to most common chemical reactions (such as combustion, for example) because the outer valence shell contains eight electrons.
How many grams of magnesium
sulfate (MgSO4) are dissolved in
0.965 L of a 0.0575 M solution?
Molar Mass Mg: 24.30 g/mol
Molar Mass S: 32.06 g/mol
Molar Mass O: 16.00 g/mol
Answers
Explanation:
Concentration question....
0.965L x (0.0575 mol MgSO4 / 1L) x (120.4g MgSO4 / 1 mol MgSO4) = 6.68g MgSO4
The concept molarity is used here to determine the grams of magnesium sulfate dissolved in 0.965 L of a 0.0575 M solution. The mass of magnesium sulfate in grams is 6.68 g.
What is molarity?The molarity of a solution is defined as the number of moles of the solute present per litre of the solution. It is generally represented by the unit mol/L. The equation used to calculate the molarity is:
Molarity = Number of moles of the solute / Volume of the solution in litres
The molar mass of MgSO₄ = 120.36 g/mol
We have 0.0575 M solution.
That is 0.0575 mol/L × 120.36 g/mol = 6.9207 g/L
Here we want mass in 0.965 L. So the mass is:
Mass = 0.965 L × 6.9207 g/L = 6.68 g
Thus the mass in grams of magnesium sulfate is 6.68 g.
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What property of water accounts for its ability to insulate areas around it?
Answers
Answer:
Floating ice can insulate bodies of water. Answer: b. Discuss how a high specific heat helps to buffer temperature for organisms. Water's high specific heat is important to life because...
Explanation:
LC Chemistry I v18 (GS) / Module 01: Matter
1.(01.05 LC)
Which of the following is an example of a chemical change? (4 points)
Boiling water
Burning paper
Dissolving sugar in water
Melting gold
Answers
Answer:
Burning Paper
Explanation:
Burning Paper is an example of a chemical change because;
- A new substance called ''Ash'' is formed.
- It is an irreversible reaction.
issued this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your etext. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon.
Answers
The atomic ratio of carbon to oxygen in carbon monoxide (CO) is 1:1, and the atomic ratio of carbon to oxygen in carbon dioxide (CO₂) is 2:1.
Firstly, we can analyze the decomposition of carbon monoxide (CO) and carbon dioxide (CO₂) to determine the atomic ratios involved.
Let's denote the atomic ratio of carbon to oxygen in carbon monoxide as x, and the atomic ratio of carbon to oxygen in carbon dioxide as y.
According to the given data;
Decomposition of carbon monoxide (CO);
Oxygen produced = 3.36 g
Carbon produced = 2.52 g
We know that the atomic mass of carbon is 12 g/mol, and the atomic mass of oxygen is 16 g/mol. Using these values, we can calculate the number of moles for each element;
Number of moles of oxygen = mass / atomic mass = 3.36 g / 16 g/mol = 0.21 mol
Number of moles of carbon = mass / atomic mass = 2.52 g / 12 g/mol = 0.21 mol
Since the atomic ratio of carbon to oxygen in carbon monoxide is x, we can write the following equation;
0.21 mol C / (0.21 mol O) = x
Simplifying the equation, we have;
x = 1
Therefore, the atomic ratio of carbon to oxygen in carbon monoxide is 1:1.
Decomposition of carbon dioxide (CO₂);
Oxygen produced = 9.92 g
Carbon produced = 3.72 g
Following the same calculations as before;
Number of moles of oxygen = mass / atomic mass = 9.92 g / 16 g/mol = 0.62 mol
Number of moles of carbon = mass / atomic mass = 3.72 g / 12 g/mol = 0.31 mol
Since the atomic ratio of carbon to oxygen in carbon dioxide is y, we can write the following equation;
0.31 mol C / (0.62 mol O) = y
Simplifying the equation, we have;
y = 0.5
Therefore, the atomic ratio of carbon to oxygen in carbon dioxide is 1:0.5, which can be simplified to 2:1.
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--The given question is incomplete, the complete question is
"Missed this? watch kcv: atomic theory; read section 2.3. you can click on the review link to access the section in your text. carbon and oxygen form both carbon monoxide and carbon dioxide. when samples of these are decomposed, the carbon monoxide produces 3.36 g of oxygen and 2.52 g of carbon, while the carbon dioxide produces 9.92 g of oxygen and 3.72 g of carbon. Calculate the atomic ratio of carbon to oxygen in carbon monoxide, and carbon dioxide."--
just answer it perfectly
Answers
Answer
Form the sentences as you read along the blanks
Explanation:
1. Classical Era
2. Homophonic
3. Dynamics
4. Symphony
5. Sonata
6. Concerto
7. Composers
8. Ludwig
9. Wolfgang
10. Franz
Seawater is 3.5% Sodium Chloride by mass. Sea Salt can contain about 10 % water.
How much water is removed from every Kilogram of Commercial Sea Salt?
Answers
10g water is removed from every Kilogram of Commercial Sea Salt
Answer:
900 g
Explanation:
90% of 1000 g is 900g
Could someone help me answer these questions with the answer and typed steps for how each answer was found? I asked this question previously but, I could not read the handwritten answer.
7. A 25 g soil sample was extracted with 75 mL of NH4OAc (pH 7.0), and the filtrate was analyzed
on an atomic absorption unit. The following results were obtained:
100 mg/L Ca2+, 45 mg/L Mg2+, 85.5 mg/L K+, 94.2 mg/L Al3+ and 8.0 mg/L H+.
a. What is the CEC in cmol(+)/kg for this sample?
b. What is the % B.S. for this soil?
c. What is the % acid saturation for this soil sample?
Answers
The CEC for this soil sample is 675.2 cmol(+)/kg.
The % Base Saturation for this soil sample is approximately 136.62%.
The % Acid Saturation for this soil sample is approximately 60.55%.
To calculate the CEC, % Base Saturation (B.S.), and % Acid Saturation for the given soil sample:
a. Calculation of CEC (Cation Exchange Capacity):
CEC is the sum of exchangeable cations in the soil. From the given results, we have:
CEC = Ca2+ + Mg2+ + K+ + Al3+
CEC = (100 mg/L + 45 mg/L + 85.5 mg/L + 94.2 mg/L) / (25 g / 1000)
CEC = 168.7 mg / (25 g / 1000)
CEC = 675.2 cmol(+)/kg
b. Calculation of % Base Saturation (B.S.):
% B.S. represents the percentage of CEC occupied by base cations. In this case, we consider Ca2+, Mg2+, and K+ as base cations. The formula to calculate % B.S. is:
% B.S. = (Ca2+ + Mg2+ + K+) / CEC * 100
% B.S. = (100 mg/L + 45 mg/L + 85.5 mg/L) / (168.7 cmol(+)/kg) * 100
% B.S. = 230.5 mg / (168.7 cmol(+)/kg) * 100
% B.S. = 136.62%
c. Calculation of % Acid Saturation:
% Acid Saturation represents the percentage of CEC occupied by acid cations, in this case, H+ and Al3+. The formula to calculate % Acid Saturation is:
% Acid Saturation = (H+ + Al3+) / CEC * 100
% Acid Saturation = (8.0 mg/L + 94.2 mg/L) / (168.7 cmol(+)/kg) * 100
% Acid Saturation = 102.2 mg / (168.7 cmol(+)/kg) * 100
% Acid Saturation = 60.55%
Please note that the given values were in milligrams per liter (mg/L), and the CEC and % Saturation values were calculated assuming a conversion from mg/L to cmol(+)/kg using the mass of the soil sample (25 g).
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fluorite, a mineral of calcium, is a compound of the metal with fluorine. analysis shows that a 2.01−g sample of fluorite contains 1.030 g of calcium. calculate the following:(a) mass of fluorine in the sample.
Answers
A. The mass of fluorine in the sample is 0.98 g
B. The percentage of fluorine in the sample is 48.8%
A. How do i determine the mass of fluorine?The mass of fluorine in the sample can be obtained as follow:
Mass of sample = 2.01 gMass of calcium = 1.030 gMass of fluorine =?Mass of fluorine = Mass of sample - Mass of calcium
= 2.01 - 1.030
= 0.98 g
How do i determine the percentage of fluorine?The percentage of fluorine in the sample can be obtain as follow:
Mass of fluorine = 4.51 gMass of sample = 2.01 gPercentage of fluorine =?Percentage of fluorine = (mass of of fluorine / mass of sample) × 100
= (0.98 / 2.01) × 100
= 48.8%
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Complete question:
fluorite, a mineral of calcium, is a compound of the metal with fluorine. analysis shows that a 2.01−g sample of fluorite contains 1.030 g of calcium. calculate the following:
(a) mass of fluorine in the sample
(b) percentage of fluorine in the sample
in an aromatic substitution reaction with molecular bromine, how does iron (fe) affect the bromine to react with an aromatic ring?
Answers
An aromatic substitution reaction, the presence of iron in the reaction mixture enhances the electrophilicity of the bromine atom enough that it will react with benzene.
An electrophile substitutes an atom that is affixed to an aromatic ring in electrophilic aromatic substitution reactions, which are organic processes. Typically, in these reactions, an electrophile takes the place of a hydrogen atom from a benzene ring.
An electrophilic aromatic substitution process maintains the aromaticity of the aromatic system. The stability of the aromatic ring is retained, for instance, when bromobenzene is produced from the reaction of benzene and bromine.
A substitution reaction is when an atom or group of atoms in an organic molecule are directly replaced by another atom or group of atoms without causing any changes to the remaining components of the molecule. Electrophiles can start substitution reactions, which are referred to as electrophilic substitution reactions. Nucleophilic substitution reactions are those involving substitution that start with a nucleophile attack.
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How many liters would a 20 liter sample of gas at STP occupy if the
pressure was changed to 20 atmospheres and the temperature was changed to
38°C?
Answers
A 20-liter sample of gas at STP would occupy 5.68 liters if the pressure was changed to 20 atm and the temperature was changed to 38°C.
To solve this problem, we can use combined gas law, which relates the pressure, volume, and temperature of a gas. The formula for the combined gas law is:
\((P_1 * V_1) / (T_1 * n_1) = (P_2 * V_2) / (T_2 * n_2)\)
where P1 and P2 are the initial and final pressures of the gas \(V_1\) and \(V_2\) are the initial and final volumes of the gas.
At STP, the conditions are 1 atmosphere of pressure and 0°C (273 K) of temperature.
Therefore, we can use these values as our initial conditions \((P_1 = 1\ atm, T_1 = 273 K)\) and solve for \(V_2\), the final volume of the gas:
\((P_1 * V_1) / T_1 = (P_2 * V_2) / T_2\\V_2 = (P_1 * V_1 * T_2) / (P_2 * T_1)\)
Substituting the given values, we get:
\(V_2 = (1 atm * 20 L * 311 K) / (20 atm * 273 K) \\V_2 = 5.68 L\)
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is the yellowing of the pages of an old book a physical or chemical change? please explain
Answers
Answer: a chemical change. A physical change would be like crushing up a piece of paper, you could fold it back out until its flat. A chemical change would be something unreversable, i.e. going from all the different ingredients to a fully b asked cookie. The yellowing of pages is due to oxidization.
Explanation:
The yellowing of the pages of an old book is a chemical change that happens due to the reaction of paper with the air and fungus present in the air.
What are chemical changes?Chemical changes are those changes that occur due to the reaction of two or more substances between them. These changes are irreversible. These changes change the physical and chemical condition of the substance.
A perceptible change would be comparable to crumpling up a sheet of paper and then folding it out again till it is flat.
An irreversible chemical shift would be going from all the various ingredients to a completely baked cookie. Oxidation is what causes the pages to turn yellow.
Thus, an old book's pages will eventually turn yellow due to a chemical interaction between the paper and the air and any fungi in the air.
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Determine the density of a liquid from the following data: Mass of the
graduated cylinder: 33.79 g. Mass of the cylinder and liquid: 40.14 g
Volume of liquid: 13.3 mL
Answers
Answer:0.477 g/ml
Explanation:
Density=(40.14-33.79)/13.3 ml
Density=6.35/13.3
Density=0.477 g/ml
WILL GIVE BRAINLIEST, Which of the following would have the greatest amount of surface area?
A. 1 cubic foot of watermelons
B. 1 cubic foot of matchbox cars
C. 1 cubic foot of loose sand
D. A 1 cubic foot block of concrete
Answers
Answer:
C. 1 cubic foot of loose sand
Explanation:
For many objects having equal volume , surface area will be maximum
of the object which has spherical shape .
But when a sphere is broken into tiny small spheres , total surface area of all the small spheres will be more than surface area of big sphere .
Hence among the given option , surface area of loose sand will have greatest surface area . Loose sand is equivalent to small spheres .
Answer:
the answer would be C 1 cubic foot of loose sand.
Teresa has taken three tests worth 100 points each. Her scores are 85, 93, and 88. She has one test left to take.
To get an average score of 90, what must the sum of all her test scores be?
a.
400
c.
600
b.
360
d.
300
Answers
Answer:
SOrry it makes me writer sotufjksankdn
Explanation:
What is the total number of electrons in As-3?
Answers
Answer:
Arsenic, As, has atomic number 33, which is the number of protons in the nuclei of its atoms. A neutral As atom would also have 33 electrons. The electron configuration of a neutral arsenic atom is [Ar]3d104s24p3
Explanation:
What is the concentration of a solution that contains 55.82 g of NH3 in enough water to make 500 ML solution
Answers
The concentration of the solution is 6.56 M.
The concentration of a solution is typically expressed in units of moles per liter (M) or grams per liter (g/L). To determine the concentration of this solution, we need to first calculate the number of moles of NH₃ present in the solution:
Molar mass of NH₃ = 14.01 g/mol + 1.01 g/mol
= 17.02 g/mol
Number of moles of NH₃ = 55.82 g / 17.02 g/mol
= 3.28 mol
We need to convert the volume of the solution from milliliters to liters:
500 mL = 0.5 L
Finally, we can calculate the concentration of the solution in units of M:
Concentration = Number of moles / Volume in liters
Concentration = 3.28 mol / 0.5 L = 6.56 M
As a result, the solution concentration is 6.56 M.
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What is the hydronium ion concentration in an aqueous nitric acid solution with a pH of 1.430 ? [H 3
O +
]= What is the pH of an aqueous solution of 1.40×10 −2
M hydrochloric acid?
Answers
The hydronium ion concentration in the nitric acid solution is [H3O+] = 4.48 × 10^−2 M.
The pH of the hydrochloric acid solution is pH = 1.85.
1. To find the hydronium ion concentration in the nitric acid solution with a pH of 1.430, we can use the equation pH = -log[H3O+]. Rearranging the equation, we have [H3O+] = 10^(-pH). Plugging in the given pH value:
[H3O+] = 10^(-1.430) = 4.48 × 10^(-2) M
Therefore, the hydronium ion concentration in the nitric acid solution is [H3O+] = 4.48 × 10^(-2) M.
2. The pH of an aqueous solution can be calculated using the equation pH = -log[H3O+]. In the case of hydrochloric acid (HCl), it is a strong acid, meaning it completely ionizes in water to produce H3O+ ions. Therefore, the concentration of H3O+ is equal to the concentration of HCl.
Given that the concentration of hydrochloric acid is 1.40 × 10^(-2) M, we can directly use this value to calculate the pH:
pH = -log(1.40 × 10^(-2)) = 1.85
Therefore, the pH of the hydrochloric acid solution is pH = 1.85.
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what types of cells did Matthias Schleiden study?... HELP PLZ!!!
Answers
Answer:
plants or The Cell Theory
Explanation:
what is the importance of polar covalent and hydrogen bonds in the structure of water?
Answers
Answer:
Water is a remarkable substance, and its unique properties are largely due to the presence of polar covalent bonds and hydrogen bonds in its structure. These characteristics play a crucial role in the physical and chemical properties of water, making it essential for life as we know it.
Explanation:
The polar covalent bonds in water arise from the unequal sharing of electrons between oxygen and hydrogen atoms. This results in the oxygen atom having a partial negative charge (δ-) and the hydrogen atoms having partial positive charges (δ+). These charges create polarity within the water molecule, leading to the formation of hydrogen bonds.
Hydrogen bonds occur when the partially positive hydrogen atom of one water molecule is attracted to the partially negative oxygen atom of another water molecule. These hydrogen bonds are relatively weak individually, but when present in large numbers, they contribute to the cohesion, surface tension, and high boiling point of water.
The importance of these bonds is manifold. The cohesion between water molecules due to hydrogen bonding enables water to form droplets, have a high surface tension, and flow freely, facilitating transport within organisms and in the environment. Additionally, hydrogen bonding leads to the high specific heat capacity and heat of vaporization of water, making it an effective regulator of temperature in living organisms and ensuring stable environmental conditions.
Furthermore, hydrogen bonds play a crucial role in the unique properties of water as a solvent. The polar nature of water allows it to dissolve a wide range of substances, including ionic compounds and polar molecules, facilitating various biological processes such as nutrient transport and chemical reactions in cells.
Click on the diagram to choose which atom is more reactive.
Answers
Answer:
Second graph is more reactive.
Explanation:
I just did the lesson myself, chose the first graph, and obviously got it wrong.
Therefore I can tell you with 100% certainty that the correct answer is graph #2 in this case. Hope this helps.
what is the pH of hydrogen chloride and sodium oxide
Answers
how would I mix the chemicals
Answers
Answer:
Mixing chemicals can be dangerous because you are handling chemicals that are often hazardous.*
Always wear the correct personal protective clothing and equipment when mixing chemicals.
Follow these steps to mix chemicals safely:
Choose a suitable mixing area. The site should be away from plants, people, animals and waterways. It needs to have good lighting and must be well ventilated. There should be first aid equipment and materials to clean up any spills that may occur. Make sure you have lots of clean, fresh water available. The water that you are using in your mixture should be as clean as possible.
Check the product label for the chemical to find out how to mix a solution, including the proportions or volumes needed. If you are unsure, contact the manufacturer or retailer for instructions. I hope it helps. Be safe.
An unlabeled drug bottle was found in the medicine cabinet of Smith’s bathroom. A 100 g sample of the drug was analyzed and found to contain 64.94% C, 4.50 % H, 20.36% O, and 10.20% S. The molar mass of the compound was found to be 314.38 g/mol. It may be a drug prescribed for osteoarthritis. Coincidentally, Smith’s arthritis has become so intolerable in recent weeks that he’s had to rely on the aid of a crutch for mobility. Prolonged ingestion of this drug is thought to lead to a heart attack. Smith’s doctor, Franklin Finch, has a quiet reputation of prescribing dangerous drugs to “dispose of” unwanted patients. Lately, Smith has been gaining more recognition in the community due to his latest research on aromatic hydrocarbons. Could Finch’s jealousy by the cause of Tony Smith’s death?
Answers
Multiplying each subscript in the empirical formula by the scaling factor gives us the molecular formula: C₁₆H₁₄O₄S becomes C₁₅.8H₁₃.9O₃.9S.
What is drug?A drug is a substance that alters the way a living organism functions. Drugs can be used for medicinal, recreational, or experimental purposes. Medicinal drugs are used to prevent, cure, or treat diseases, disorders, and injuries. Recreational drugs are used for pleasure or to alter one's mental state. Experimental drugs are used in clinical trials or research studies to investigate their effects on the human body.
Here,
To determine the molecular formula of the compound, we can use the percent composition of each element and the molar mass.
First, we can find the mass of each element present in the 100 g sample:
Mass of C: 64.94 g
Mass of H: 4.50 g
Mass of O: 20.36 g
Mass of S: 10.20 g
Next, we can convert each mass to moles using the molar mass:
Moles of C: 64.94 g / 12.01 g/mol = 5.41 mol
Moles of H: 4.50 g / 1.01 g/mol = 4.46 mol
Moles of O: 20.36 g / 16.00 g/mol = 1.27 mol
Moles of S: 10.20 g / 32.06 g/mol = 0.32 mol
We can then divide each mole value by the smallest mole value to get a set of whole-number ratios:
C: 5.41 mol / 0.32 mol = 16.91
H: 4.46 mol / 0.32 mol = 13.94
O: 1.27 mol / 0.32 mol = 3.97
S: 0.32 mol / 0.32 mol = 1
Multiplying each ratio by the smallest whole number that makes all the ratios integers gives us the empirical formula:
C₁₆H₁₄O₄S
To find the molecular formula, we need to know the molar mass of the compound. The molar mass given in the problem is 314.38 g/mol. Dividing the molar mass by the empirical formula mass gives us the scaling factor:
Scaling factor = 314.38 g/mol / 318.34 g/mol = 0.987
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(01.06 MC)
The gas carbon dioxide is a pure substance. Which of the following is true about carbon dioxide?
Group of answer choices
A:Carbon and oxygen are chemically bonded in it.
B:Carbon and oxygen retain their original identity in it.
C:It can be separated into carbon and oxygen using physical methods.
D:The proportion of carbon and oxygen is different in different samples of the gas.
Answers
Answer:
It can be chemically separated if it is a compound. The gas carbon dioxide is a pure substance.
Explanation:
Carbon dioxide is a pure substance because it has a fixed composition no matter where it was taken. Each molecule of carbon dioxide will always have 1 carbon and 2 oxygens.
infrared (ir) spectroscopy is used to identify functional groups within a molecule. which of these regions corresponds to the fingerprint region for the molecule? the structure is a benzene ring bonded to an amine on carbon 1. there is a methyl group on carbons 2 and 6. the ir spectrum has several labeled peaks. a is a broad stretch around 3300, b is a series of stretches around 2900, c is around 1800 and there are very small peaks, d is a large stretch at around 1600 and e is around 1000 inverse centimeters in wavenumber. identify the fingerprint region.
Answers
Using the infrared (IR) spectroscopy, the fingerprint region of functional groups within a molecule is equals to region E, around 1000 inverse centimeters in wavenumber. So, the correct choice is option (d).
IR spectroscopy measures the vibrations of atoms and can determine functional groups based on them. In general, atoms with stronger bonds and lighter atoms vibrate at higher stretch frequencies (wavenumbers). The infrared spectrum can be divided into two regions :
functional group regions and fingerprint regions.The IR spectrum is referred to as the fingerprint region because the absorption pattern is very complex but unique to each organic structure. Fingerprint Zone: 1450-500 inverse centimeter range of the infrared spectrum. So, the right answer is region E in diagram. Because the range of this region is around 1000 inverse centimeters in wavenumber, which is under the fingerprint region in IR spectra. Thus, option (e) is correct answer.
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Complete question:
infrared (ir) spectroscopy is used to identify functional groups within a molecule. which of these regions corresponds to the fingerprint region for the molecule? See the above figure, structure is a benzene ring bonded to an amine on carbon 1. there is a methyl group on carbons 2 and 6. the ir spectrum has several labeled peaks.
a) A is a broad stretch around 3300,
b) B is a series of stretches around 2900,
c) C is around 1800 and there are very small peaks,
d) D is a large stretch at around 1600 and
e) E is around 1000 inverse centimeters in wavenumber. identify the fingerprint region.
