Answer:
6.22 × 10⁻⁵
Explanation:
Step 1: Write the dissociation reaction
HC₆H₅COO ⇄ C₆H₅COO⁻ + H⁺
Step 2: Calculate the concentration of H⁺
The pH of the solution is 2.78.
pH = -log [H⁺]
[H⁺] = antilog -pH = antilog -2.78 = 1.66 × 10⁻³ M
Step 3: Calculate the molar concentration of the benzoic acid
We will use the following expression.
Ca = mass HC₆H₅COO/molar mass HC₆H₅COO × liters of solution
Ca = 0.541 g/(122.12 g/mol) × 0.100 L = 0.0443 M
Step 4: Calculate the acid dissociation constant (Ka) for benzoic acid
We will use the following expression.
Ka = [H⁺]²/Ca
Ka = (1.66 × 10⁻³)²/0.0443 = 6.22 × 10⁻⁵
what happens to some of the electrons in an atom when the atom is heated
Answer:
When the electrons in the atom are excited, for example by being heated, the additional energy pushes the electrons to higher energy orbitals. When the electrons fall back down and leave the excited state, energy is re-emitted in the form of a photon
Explanation:
The bond angles around a carbon in a
triple bond are
and it
is
hybridized
A. 180, sp?
B. 120, sp
C. 180, sp
D. 120, sp?
Enter
The bond angles around carbon in the triple bond are 180 degrees and it is sp hybridized. option B is correct
What is sp hybridization?This hybridization process involves mixing the valence s orbital with one of the valence p orbitals to yield two equivalent sp hybrid orbitals that are oriented in a linear geometry.
The set of sp orbitals appears similar in shape to the original p orbital, but there is an important difference. The number of atomic orbitals combined always equals the number of hybrid orbitals formed.
The p orbital is one orbital that can hold up to two electrons. The sp set is two equivalent orbitals that point 120° from each other. The two electrons that were originally in the s orbital are now distributed to the two sp orbitals, which are half filled.
Therefore, due to the sp hybrid and 120-degree angle option B is correct
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what effect does hybridization have on bonds
Hydrobromic acid dissolves solid iron according to the
following reaction:
Fe(s) + 2 HBr(aq) → FeBr2(aq) + H2(9)
Part A
What mass of HBr (in g) would you need to dissolve a 3.2 - g pure iron
Express your answer using two significant figures.
Part B
What mass of H, would be produced by the complete reaction of the iron
Answer:
A. 9.3 g
B. 0.11 g
Explanation:
Fe(s) + 2HBr(aq) → FeBr₂(aq) + H₂(g)PART A
First we convert 3.2 grams of pure iron into moles, using its molar mass:
3.2 g ÷ 55.85 g/mol = 0.0573 mol FeNow we convert 0.0573 moles of Fe into moles of HBr, using the stoichiometric coefficients:
0.0573 mol Fe * [tex]\frac{2molHBr}{1molFe}[/tex] = 0.115 mol HBrFinally we convert 0.115 moles of HBr into grams, using its molar mass:
0.115 mol HBr * 80.91 g/mol = 9.3 g HBrPART B
This time we convert the 0.0573 moles of Fe from last time into H₂ moles:
0.0573 mol Fe * [tex]\frac{1molH_2}{1molFe}[/tex] = 0.0573 mol H₂Finally we convert H₂ moles into grams:
0.0573 mol H₂ * 2 g/mol = 0.11 gWhat process is represented by the letter on the diagram?
A: ____________________________________________
B: ____________________________________________
C: ____________________________________________
D: ____________________________________________
E: ____________________________________________
Explanation:
I don't really understand the question
How many atoms is 3.2 mol phosphorus?
Answer:
I think 4 I'm not completely sure
Explanation:
I hope it's right
write down the used of hydrogen gas
Answer:
Nearly all of the hydrogen consumed in the United States is used by industry for refining petroleum, treating metals, producing fertilizer, and processing foods. U.S. petroleum refineries use hydrogen to lower the sulfur content of fuels.
Explanation:
Hope it helped brainlist plz:)
Zinc + Hydrochloric Acid - Zinc Chloride and Hydrogen Gas
Zn + 2HCI
ZnCl2 + Hz
I know there are 2 molecules of hydrochloric acid because there is....
O a 2 in front of HCI
O a 2 behind the CI
O a 2 behind the H
Answer:
The first choice: a 2 in front of HCl
Explanation:
Molecules in a substance change into a new kind of molecule during a phase change.
Answer:
A phase change is occurring; the liquid water is changing to gaseous water, or steam. On a molecular level, the intermolecular forces between the water molecules are decreasing. The heat is providing enough energy for the water molecules to overcome these attractive forces.
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Have a great day, be safe and healthy
Thank u
XD
The phase transition takes place at the molecular level by changing the strength of intermolecular forces between the molecules.
What is phase change?Phase changes can be defined as the physical processes of transition between a state of a medium, identified by some parameters. These changes in states of matter that can be written as liquid, gas, solid, and plasma.
A particular phase in a thermodynamic system exhibits uniform physical properties. During a phase transition, some properties of the medium change, because of the change in external conditions, such as temperature, and pressure.
In a solid state, the molecules are compactly bound by a strong force of attraction. In the liquid state, the molecules have lesser attraction forces. The phase changes depend upon the temperature and pressure.
Therefore, phase transitions occur on a molecular level as the alteration in the strength of intermolecular forces.
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Please help me, im studying for finals and i need an answer to this question! Will mark brainliest for the best answers!w
Answer:
the generation of electricity and other energy jointly, especially the utilization of the steam left over from electricity generation to produce heat.
I hope it helps!! Have a nice day
Answer:
Cogeneration r is the use of a heat engine or power station to generate electricity and useful heat at the same time.
What is the concentration in %v/v of a solution containing 3.2 L of ethanol in 6.5 L of solution?
Answer: Have a nice dAy?
Explanation: I thought i knew but nvm sorry
(100 PTS NEED HELP ASAP)
Water waves are surface waves. The energy of the waves moves...
only perpendicular to the motion of the wave
only parallel to the motion of the wave
both parallel and perpendicular to the wave
Answer:
Explanation:
Waves are actually energy passing through the water, causing it to move in a circular motion. ... This phenomenon is a result of the wave's orbital motion being disturbed by the seafloor.
The direction a wave propagates is perpendicular to the direction it oscillates for transverse waves. A wave does not move mass in the direction of propagation; it transfers energy.
The dosage for an antibiotic is prescribed at 8.0 mg per kilogram of body weight taken it twice daily for 2 weeks what total mass of antibiotic will be taken by a 180 lb person for the two week period?
Answer:
18.2784 g
Explanation:
First we convert 180 lb to kg:
1 lb = 0.453 kg180 lb * 0.453 kg / lb = 81.6 kgNow we calculate the mass of antibiotic taken in one day:
8.0 mg/kg * 81.6 kg = 652.8 mgGiven that it is taken twice daily, in one day the person would take (652.8 * 2) 1305.6 mg. In grams that mass would be:
1305.6 mg / 1000 = 1.3056 gFinally we multiply those 1.3056 daily grams by the 14 days in two weeks:
(1.3056 g) * 14 = 18.2784 gThe total mass of the antibiotic taken by a 180 lb person for the two-week period would be 18,252.8 mg.
An antibiotic is a type of antimicrobial substance used to treat bacterial infections. It is a medication that either inhibits the growth of bacteria or kills them outright.
Antibiotics work by targeting specific structures or functions in bacterial cells, disrupting their ability to replicate or causing them to die. They are an essential tool in modern medicine for treating various bacterial illnesses and have significantly contributed to improving human health by reducing the impact of infectious diseases.
To calculate the total mass of the antibiotic taken by a 180 lb person for a two-week period,
Convert the person's weight from pounds to kilograms:
Weight in kilograms = 180 lb × 0.453592 kg/lb
= 81.65 kg
Daily dosage = 8.0 mg/kg × 81.65 kg
= 653.2 mg
Total dosage for two weeks = Daily dosage × 2 (twice daily) × 14 (days)
= 18,252.8 mg
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Why do women have more reactions to vaccines?
Experts say this isn’t unusual with vaccinations because the estrogen in women’s bodies is designed to elicit a stronger immune response.
Hope it helps you ☺
Happy Learning ⭐
Calculate the molarity of each of the following
solutions.
Part A
4.35 mol of LiCl in 3.60 L solution
Part B
29.43g of C6H12O6 in 1.37 L solution
Part C
34.5mg of NaCl in 119.1 mL of solution
Answer:
a. 1.21M
b. 0.119M
c. 0.00496M
Explanation:
Molarity, M, is an unit of concentration defined as the ratio between moles of solute and liters of solution:
a. 4.35 mol LiCl / 3.60L = 1.21M
b. 29.43gC6H12O6 * (1mol / 180.16g) = 0.1634moles / 1.37L = 0.119M
Molar mass C6H12O6: 180.16g/mol
c. 34.5mg NaCl = 0.0345g * (1mol / 58.44g) = 5.9x10⁻⁴moles / 0.1191L = 0.00496M
label the sun. which layer of the sun is #6?
Answer: Corona
Explanation: hope this help
Which of these is a carbohydrate?
1. C6 H12 O6
2. C6 H6 O12
3. C6 H13 O2 N
4. C3 H7 O2 Ns
Answer:
C6H12O6
Glucose
Explanation:
Glucose is a monocarbohydrate
carbohydrates always have only C, H, and O
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Calculate the pH of the buffer solution comprised of 0.20 M HCHO2 and 0.15 M NaCHO2. (Ka for HCHO2 = 1.8 x 10-4)
Answer:
3.62
Explanation:
Using the Henderson-Hasselbach equation:
pH = pKa + log[base]/[acid]
pH = -log(1.8 x 10^-4) + log(0.15/0.20) = 3.62
The pH of acid is between 0-7 on pH scale while for base pH range is from 7-14. Therefore, the pH of of the buffer solution comprised of 0.20 M HCHO₂ and 0.15 M NaCHO₂. (Ka for HCHO2 = 1.8 x 10⁻⁴) is 3.62. pH is a unitless quantity.
What is pH?pH is a measurement of amount of hydronium ion H₃O⁺ in a given sample. More the value of hydronium ion concentration, more will be the solution acidic.
On subtracting pH from 14, we get pOH which measures the concentration of hydroxide ion in a given solution. pH depend on the temperature. At room temperature pH scale is between 0 to 14. pH of neutral solution is 7.
Using the Henderson-Hassel Bach equation:
pH = pKa + log[base]/[acid]
pH = -log(1.8 x 10^-4) + log(0.15/0.20) = 3.62
Therefore, the pH of of the buffer solution comprised of 0.20 M HCHO2 and 0.15 M NaCHO2. (Ka for HCHO2 = 1.8 x 10-4) is 3.62.
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How many grams of CoCl2 in 1/2 liter would be used to make a 1.0 molar solution? (can you show steps please?)
Answer:
The answer I think that is correct is 65g
There are 49.5g of CoCl2 in 1/2 liter used to make a 1.0 molar solution. Details about how to calculate molar concentration can be found below.
How to calculate mass?The mass of a substance can be calculated by multiplying the number of moles of the substance by its molar mass.
However, the number of moles of CoCl2 must be calculated using the following formula:
no of moles = 0.5L × 1M
no of moles = 0.5moles
Molar mass of CoCl2 = 99g/mol
mass of CoCl2 = 0.5 × 99
mass of CoCl2 = 49.5g
Therefore, there are 49.5g of CoCl2 in 1/2 liter used to make a 1.0 molar solution.
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ILL GIVE BRAINLIEST!
Answer:
A since dormant volcanoes haven't erupted for a long time but are expected to erupt again in the future.
Explanation:
Wine goes bad soon after opening because Ethanol (CH3CH2OH) dissolved in it reacts with oxygen (O2) gas to form water and Aqueous Acetic acid (CH3COOH) The main ingredient of vinegar. Calculate the moles of water produced by the reaction of 0.060 mol of oxygen
Answer:
[tex]0.060molH_2O[/tex]
Explanation:
Hello there!
In this case, since the chemical reaction between ethanol and oxygen to water and acetic acid is:
[tex]CH_3CH_2OH+O_2\rightarrow CH_3COOH+H_2O[/tex]
Thus, since there is a 1:1 mole ratio between oxygen and water, the produced moles of water are calculated down below:
[tex]0.060molO_2*\frac{1molH_2O}{1molO_2}=0.060molH_2O[/tex]
Best regards!
Mark the statements which are correct. A. All of the following elements are expected to gain electrons to form ions in ionic compounds: Ga, Se and Br. B. The symbols for the elements magnesium, aluminum and xenon are Mn, Al and Xe, respectively. C. The metals Co, Cu and Ti all require Roman numerals in the names of their compounds. D. The elements Co, Ni, and Hg are all transition elements.E. The elements P, As, and Bi are in the same family on the periodic table.
Answer:
The metals Co, Cu and Ti all require Roman numerals in the names of their compounds.
The elements Co, Ni, and Hg are all transition elements.
The elements P, As, and Bi are in the same family on the periodic table.
Explanation:
Transition elements are those which changes their charges as they bond with other elements or forms a compound with other elements. They show transitional behavior when they bond. Some of the transition elements are :
Chromium, Titanium, cobalt, mercury, copper, iron, vanadium, zinc, Silver, etc.
The transition elements use roman numerals in their names of the compounds.
Therefore, Cobalt (Co), Copper (Cu) and Titanium (Ti) are the elements that require a Roman numeral in the names of their compounds.
The elements Phosphorus (P), Arsenic (As) and Bismuth (Bi), they all belong to the nitrogen family of Group 15 (Va).
Linnaeus created seven levels of classification.
What are the names of the seven levels?
Select all correct answers.
Animalia
Protista
Kingdom
Order
Phylum
Organism
Fungi
Family
Class
Species
Line
Genus
How will an increase in the average yearly ocean temperature most
likely affect Earth's weather?
Answer:
I'd Say B
Explanation:
If 154.9 grams of KOH exactly neutralizes 262 mL of an aqueous HCl solution, what is the concentration of the HCl solution
Answer:
10.5M HCl
Explanation:
Using the chemical reaction:
KOH + HCl → H₂O + KCl
Where 1 mol of KOH reacts per mole of HCl
We can solve this problem converting the mass of KOH to moles using its molar mass. The moles of KOH added are equal to moles of HCl in the solution. That is:
Moles KOH = Moles HCl
154.9g KOH * (1mol / 56.1g) = 2.761 moles
The molarity of the solution (Moles HCl per liter of solution) is:
2.761moles HCl / 0.262L =
10.5M HClWhat do you have to do if there is an unexpected violent chemical reaction in a bottle ?
Answer:
What i would do is put it in the nearest sink or better yet a bathtub. because if it was violent, do you really want that everywhere?
Explanation:
:)
A 1.00 L sample of gas at 760 torr is compressed to 0.800 L at constant
temperature. Calculate the final pressure of the gas.
Answer:
950 torr
Explanation:
Step 1: Given data
Initial volume of the gas (V₁): 1.00 LInitial pressure of the gas (P₁): 760 torrFinal volume of the gas (V₂): 0.800 LFinal pressure of the gas (P₂): ?Step 2: Calculate the final pressure of the gas
If we assume ideal behavior and constant temperature, we can calculate the final pressure of the gas using Boyle's law.
P₁ × V₁ = P₂ × V₂
P₂ = P₁ × V₁/V₂
P₂ = 760 torr × 1.00 L/0.800 L = 950 torr
The lithosphere ______ part of the earth’s crust.
A. Gaseous
B. Solid
C. Water
D. Liquid
Answer:
The lithosphere solid part of the earth's crust
Write a skeleton equation for the reaction in which aqueous sodium chloride
reacts with aqueous silver nitrate to produce aqueous sodium nitrate and solid
silver chloride.
Answer:
Explanation:according to question:
. Nacl (aq) + AgNO3 (aq) --> AgCl
(s) + NaNO3 (aq).balanced.
How many atoms would be found in 4.65mol of Og? *
Answer:
nzbjsnjjdjsj
Explanation:
nzjsnxjsjnBua ahjsbs hJbsjs jznnsjs