Given:
Temperature T = 391KReaction:41" (aq) + Mn0,(s) +2Fe2+ (aq) --Mn?* (aq) + 2Fe2+ (aq) + 2H,001) From the given standard reduction potentials, the balanced chemical reaction taking place can be written as:4H+(aq) + MnO2(s) + 2Fe2+(aq) -> Mn2+(aq) + 2Fe3+(aq) + 2H2O
(l) Standard reduction potentials:
MnO2(s) + 4H+(aq) + 2e- -> Mn2+(aq) + 2H2O(l) E° = 1.23 VFe3+(aq) + e- -> Fe2+(aq) E° = 0.77 V
The balanced chemical reaction can be split into two half-reactions: Oxidation half-reaction: MnO2(s) + 4H+(aq) + 2e- -> Mn2+(aq) + 2H2O(l)Reduction half-reaction: Fe3+(aq) + e- -> Fe2+(aq)The equilibrium constant can be calculated using the Nernst equation, which gives the relationship between equilibrium constants and reduction potentials:log(K) = (nFE°)/2.303RTwhereK = equilibrium constantn = number of electrons transferred in the overall balanced reactionF = Faraday's constantR = gas constantT = temperatureE° = standard reduction potential
We can write the equation for the overall balanced reaction as follows:
Fe3+(aq) + MnO2(s) + 4H+(aq) + 2Fe2+(aq) -> Mn2+(aq) + 2Fe3+(aq) + 2H2O
(l)The standard reduction potential for the overall balanced reaction can be calculated using the standard reduction potentials of the two half-reactions .E° cell = E°(reduction) - E°(oxidation)E° cell = 0.77 V - 1.23 V = -0.46 V Substituting the values in the Nernst equation: log(K) = ((2)(96485 C mol-1)(-0.46 V))/(2.303(8.314 J mol-1 K-1)(391 K))log(K) = -9.7K = 2.0 x 10-10Therefore, the equilibrium constant at 391 K is 2.0 x 10-10.
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What are the two flasks for measuring the liquid volume?
Answer:
Liquid volume is usually measured using either a graduated cylinder or a buret.
What are some examples which show that matter is made up of tiny particles?
which of the following is a weak acid?
A) H2SO4 (Sulfuric acid)
B) HCl (Hydrochloric acid)
C) CH3COOH (Acetic acid)
D) HNO3 (Nitric acid)
correct answer is C).
For the following molecule, what will be the ratio of the M to M+6 peaks (M:M+6, respectively)? CI Br Cl. multiple choice O 1:1 O 10:1 O 27:1 O 3:1 O 12.5:1
For the following molecule, the ratio of the M to M+6 peaks (M:M+6, respectively) for the formula CI Br Cl is: 3:1.
This is because the molecule contains only one isotope of Chlorine (Cl) which has atomic mass 35.5.
The molecular weight of the molecule will be the sum of the atomic weights of Chlorine, Bromine, and Iodine.
Therefore, molecular weight = 35.5 + 79.9 + 126.9 = 242.3 g/mol
The ratio of M to M+6 peaks can be calculated using the formula:
M: M+6 = [2n+1] : [3n+1] where n is the number of carbons in the molecule.
From the given formula, there are no carbons in the molecule, so n=0.
So M: M+6 = [2(0)+1]: [3(0)+1] = 1:1
However, since there is one isotope of Chlorine in the molecule, the ratio will be affected.
The molecular ion (M) peak will be split into two peaks: M and M+2, with an intensity ratio of 3:1.
The peak for M+6 will also be split into two peaks: M+6 and M+8, but with a much lower intensity than the M:M+2 peaks. Therefore, the ratio of M to M+6 peaks for the formula CI Br Cl is 3:1.
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enter your answer in the provided box. how many milliliters of 1.16 m naoh must be added to 175 ml of 0.20 m nah2po4 to make a buffer solution with a ph of 7.30? ml
The volume of the Naoh that is required was =4.074
What is the use of the buffer solution ?
A buffer is an aqueous solution made up of a weak acid and its salt (acid buffer) or a weak base and its salt (base buffer) (basic buffer). When a small amount of strong acid or base is added to it, its pH changes very little, and it is thus used to prevent the pH of a solution from changing.
Buffer solutions are utilised in several chemical applications. Blood is one example of a natural buffer solution. The natural pH of human blood is 7.4. Many people suffer from severe anxiety and alkalosis. Alkalosis is a condition in which the blood pH is abnormally high. The opposite situation is known as acidosis, which occurs when the pH of the blood exceeds 7.4.
naoh+nah2po4 ------------> h2o+na3po4
pka=3.39
7.30=3.39+(log(h2o/naoh)
log(h2o/naoh)=7.30-3.39
=3.91
=10^log(h2o/naoh)=10^3.91
=4.074
The volume required was=4.074
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In the diffusion in a solid experiment the Clion moved faster and further than Fe(CN)6. Please explain this result.
Material's ability to move through a medium is referred to as its diffusion coefficient. It is determined by the nature of medium, ion's size, and charge. Cl- ion has greater diffusion coefficient than Fe(CN)₆_₃ ion, which explains why Cl- ion moves faster than Fe(CN)₆_₃ ion.
The migration of ions in a solid is described by the diffusion of ions. It is a slower process that depends on the ion's charge, radius, mobility, and diffusion coefficient. The diffusion of ions is related to the Brownian motion of ions caused by their thermal energy. The smaller ions move quicker and cover a greater distance over time than larger ones, as a result of Brownian motion.
During the diffusion in a solid experiment, Cl ion moved faster and further than Fe(CN)₆ because of the following reasons: The diffusion rate is determined by the ion's charge and size. The rate of diffusion of an ion is directly proportional to the size and inversely proportional to the ion's charge. The Cl ion has a smaller size and a greater charge than the Fe(CN)6 ion.
The diffusion of Cl ion is therefore faster and covers a greater distance than the diffusion of Fe(CN)₆. Cl- ion has a greater diffusion coefficient than Fe(CN)₆_₃ion. A material's ability to move through a medium is referred to as its diffusion coefficient. It is determined by the nature of medium, the ion's size and charge. Cl- ion has greater diffusion coefficient than Fe(CN)₆_₃ ion, which explains why Cl- ion moves faster than Fe(CN)₆_₃ ion.
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An electrolytic cell is A. is cell in which reactant are continuously supplied to the cell B. a battery C. a cell in which an electric current drives a no spontaneous reaction D. a cell in which of the cell reaction is spontaneous
An electrolytic cell is a cell in which an electric current drives a no spontaneous reaction.
What is electrolytic cell?
Any apparatus in which excess electricity is changed into chemical energy or conversely is an electrolytic cell. Such a cell normally includes two electrodes, which can be metal or electrical conductors, kept apart from one another and in interface with an electrolyte (q.v. ), which is commonly an ionic compound that has been dissolved or fused.
For instance, water can be electrolyzed to create gaseous oxygen and gaseous hydrogen with the use of an electrolytic cell.
Electrical energy is transformed into chemical energy in an electrolytic cell. Electricity is generated in this situation as a result of a spontaneous redox reaction. Electricity must be provided to start the redox reaction because it is not spontaneous.
Therefore, Option C is correct.
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The physical properties of the inner core, outer core and lower mantle and essential for the development of earth's magnetic field?
Answer:
i have no idea
Explanation:
You are titrating an acid into a base to determine the concentration of the base. The endpoint of the neutralization is reached but the stopcock on the buret sticks slightly and allows a few more drops of acid to fall into the solution. How will this affect your calculations for the concentration of the base
Adding more acid after the endpoint of a titration will make the solution too acidic and lower the calculated concentration of the base, resulting in an underestimate of its concentration.
To avoid this error, it is important to stop the titration immediately once the endpoint is reached and not to add any additional drops of titrant. If the stopcock on the buret sticks, it should be fixed or replaced before proceeding with the titration to ensure accurate results.
If additional acid is accidentally added, the titration should be repeated to obtain more accurate results.
It is also important to ensure that the equipment used for the titration is clean and free of any contaminants that may affect the reaction. The buret, pipette, and other equipment should be rinsed thoroughly with the solution being used to ensure accurate results.
Additionally, the endpoint should be carefully determined, which is often indicated by a color change or other physical change in the solution being titrated.
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4NH3 +50₂ →→ 6H₂O + 4NO
How many moles of water are produced if the reactions begins with 7.50 mol NH3?
4NH3 +50₂ →→ 6H₂O + 4NO
If 25.0 moles of water are produced, how many moles of NO will also be produced?
pls help
Please make me brainalist and keep smiling dude I hope you will be satisfied with my answer
4NH3 + 5O2 = 4NO + 6H2O
Now ask yourself, "what do I want to find". You want to know how many moles of NO are produced.
What are you given? You are given that you start with 6.96 g NH3 and excess O2.
Now you need the correct conversion factor. The conversion factor is a fraction with the numerator containing the quantity you are trying to find, and the denominator containing what you are given.
4 moles NO / 4 x mol mass of NH3 Note that the numerator is in moles of NO which is the coefficient of NO in the balanced equation. The denominator includes the coefficient for NH3 x mol. mass of NH3. It should be this way whenever a substance is given in grams. Putting numbers in the factor gives you
4 moles NO / 4 x 17.031 g /mole = 0.0587 moles NO per gram of NH3. Now multiply the factor result by the number of grams NH3 you were given.
0.0587 moles NO / g NH3 x 6.96 g NH3 = 0.409 g NO produced.
______________________________________
Step 1: convert grams of NH3 to moles of NH3
Step 2: convert moles of NH3 to moles of NO using the coefficients in the balanced equation
(6.96g NH3) X (1 mol NH3 / 17.031g) = 0.409 mol of NH3
(0.409 mol NH3) X (4 mol NO / 4 mol NH3) = 0.409 mol NO
Because NH3 and NO both have a coefficient of 4 in the balanced equation, the number of moles are the same for those particular compounds.
How are ferns, gymnosperms, and angiosperms alike?
Answer: They all are vascular plants.
Explanation:
Gymnosperms are the plants which have naked seeds and ovules. They do not produce flowers. The angiosperms are the flowering plants. The ovules are enclosed inside the female flower. They produce seeds. The ferns are the seedless plants, they reproduce via spores. Gymnosperms, angiosperms and ferns share common characteristics like they have vascular system that is tissues like xylem and phloem help in conduction of water and minerals from the soil. The plant body is differentiated into root, stem and leaves. They all have photosynthetic pigments in them.
Diffusion of Ammonia in an Aqueous Solution. An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface. The concentration of ammonia in the organic phase is held constant and is such that the equilibrium concentration of ammonia in the water at this surface is 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). Water and the organic are insoluble in each other. The diffusion coefficient ofNH3 in water is 1.24 x 10- 9 m 2/sCalculate the flux N_B. Explain.
Answer:
The Flux N_B = 0
Explanation:
So, we are given the following set of data or parameters which is going to help in solving this particular Question. So, let us take each at a time;
=> "An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface."
=>" 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). ''
With the information above, we can determine the N_A(which the question did not specify that we should calculate).
For the value of N_B, it will be equals to zero(0) because the insolubility of water in organic solvent.
What is the relationship between extinction and biodiversity ?? PLEASE ANSWER!!!!!!!
Answer:
The biodiversity of an area is literally the number of species, both plant and animal, inhabiting the environment being examined. When a species is no longer found in a region, it is locally extinct.
Explanation:
Chlorine gas will react with iron metal.
Exactly 21.3 g of chlorine reacts with 11.2 g of iron.
How many iron atoms react with 30 molecules of chlorine?
A 10
B 15
C 20
D 30
According to stoichiometry and balanced chemical equation 10 iron atoms react with 30 molecules of chlorine.
What is stoichiometry?Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.
Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.It is important in balancing chemical equations.It is useful in chemical calculations while making solutions of different concentrations.
Two atoms of iron reacts with 6 molecules of chlorine , so for 30 molecules of chlorine it is, 30×2/6=10 atoms of iron.
Thus, 10 atoms of iron will react with 30 molecules of chlorine.
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Biomes are characterized by temperature, precipitation, and the plant and animal communities that live there.
True or false?
Question
What must happen to water vapor in order for a cloud to form?
MULTIPLE COICE
A. Cooling must take place
B. Rain must fall
C. Heating must take place
D. It must be moved to a new location
Option (A). Cooling must take place ( Water vapor cools and condenses to form clouds. H. Return to liquid water or ice. To condense, you need a solid that glows in water vapor. )
What is Water Vapor?
Water vapor is gaseous water, not liquid. It can be formed by either evaporation or sublimation processes. Unlike clouds, fog, and haze, which are liquid water particles suspended in the air, water vapor itself is a gas and cannot be seen.
Is water vapor simply H2O?
Water vapor has the same chemical formula as ordinary water, H2O, but the water molecules in steam interact less with each other and are less structured than water and ice. Whether water is a liquid or a gas depends on pressure, temperature, and relative humidity.
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gram staining property of a bacterium is dependent on
Gram staining property of a bacterium is dependent on the structure of its cell wall, which either retains or loses the crystal violet dye during the staining process.
Gram staining is a laboratory technique used to differentiate bacterial species into two groups based on the structure of their cell walls: Gram-positive and Gram-negative. During the staining process, the bacterial cells are initially stained with crystal violet, then treated with iodine, and washed with alcohol. Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which allows them to retain the crystal violet stain and appear purple under a microscope. In contrast, Gram-negative bacteria have a thin layer of peptidoglycan and an outer membrane that contains lipopolysaccharides, which causes them to lose the crystal violet stain and appear red or pink under a microscope. The Gram staining property of a bacterium is important for identifying and classifying bacterial species, as well as for selecting appropriate antibiotic treatments.
Peptidoglycan is a polymer consisting of sugars and amino acids that forms a mesh-like structure in the cell wall of bacteria, providing rigidity and protection against osmotic pressure. Lipopolysaccharides are complex molecules that are part of the outer membrane of Gram-negative bacteria, contributing to their structural integrity and resistance to antibiotics.
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Mean free path increases with: Select all that apply
a. increasing temperature b. decreasing temperature c. increasing pressure d. decreasing pressure
The mean free path increases with both increasing temperature (option a) and decreasing pressure (option d).
The mean free path refers to the average distance a molecule or particle travels before colliding with another. The mean free path increases with a decrease in the number of collisions, which can be influenced by factors such as temperature and pressure. Specifically, increasing temperature leads to an increase in the speed of particles, reducing the frequency of collisions and increasing the mean free path.
On the other hand, decreasing temperature leads to slower particle speeds and a higher frequency of collisions, decreasing the mean free path. Similarly, decreasing pressure reduces the number of particles in a given space, reducing the frequency of collisions and increasing the mean free path, while increasing pressure has the opposite effect and reduces the mean free path. Therefore, the mean free path increases with increasing temperature and decreasing pressure. Answer( option a and d)
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which one of the following is not a statement of the kinetic molecular theory? a) gas particles will be attracted to one another. b) the volume available to the gas particles is equal to the volume of the container. c) the measured pressure is from collisions of the gas particles with the walls of the container. d) the average kinetic energy is proportional to the temperature of the system.
The kinetic molecular theory does not suggest that "gas particles will be attracted to one another. Hence, the correct option is (a).
The kinetic molecular theory is a set of assumptions about the behavior of gases based on the motion of their constituent particles.
1. The gas particles are in constant, random motion and are in collisions with each other and the walls of the container.
2. The volume occupied by the gas particles is negligible compared to the volume of the container.
3. The collisions between gas particles and the walls of the container result in a measurable pressure.
4. The average kinetic energy of the gas particles is proportional to the temperature of the system.
The first three assumptions are considered to be part of the basic kinetic molecular theory, while the fourth assumption is sometimes referred to as the equipartition theorem.
Therefore, the statement "gas particles will be attracted to one another" is not part of the kinetic molecular theory and is incorrect. The interactions between gas particles are not considered in this theory, which assumes that they do not interact with each other except during brief, elastic collisions.
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I WILL GIVE BRAINLIEST!!!!!!!!
If 10.0g of nitrogen is reacted with 100.0g of hydrogen, what is the excess reactant? What is the limiting reactant? Show your work.
24. what is the most likely method of decay of the radioactive isotope technicium-99 (99tc)? a. alpha decay b. beta decay c. electron capture d. positron emission e. both electron capture and positron emission
The radioactive isotope Technium-99 decays most likely through alpha decay (99tc). An atomic nucleus emits an alpha particle during the radioactive decay process known as "alpha decay".
and then changes or "decays" into a separate atomic nucleus with a mass number that is decreased by four and an atomic number that is decreased by two. The nucleus of an atom of helium-4 is the same as an alpha particle. Radioisotopes are an element's radioactive isotopes. They are the atoms with unstable neutron-proton combinations or excess energy in their nuclei. During those processes, the radionuclide is said to experience radioactive decay, albeit the surplus energy may be put to use in any number of ways.
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If the reaction of 91.3 grams of C3H6 produces a 81.3% yield, how many grams of CO2 would be produced?
Answer:
81.3 a
Explanation:
Just search up answers on wolframalpha.com
what does it mean to be coplanar in relationship to molecules
The two types of strong acids are binary acids containing hydrogen bonded to a(n) _____ atom and oxoacids in which the number of O atoms exceeds the number of ionizable protons by _____ or more.
The two types of strong acids are binary acids containing hydrogen bonded to a non-metallic atom and oxoacids in which the number of O atoms exceeds the number of ionizable protons by two or more.
Acids are classified as binary acids or oxoacids, depending on their chemical structure. A binary acid is a type of acid that contains only two elements, hydrogen and one other non-metallic element. Oxoacids contain oxygen, hydrogen, and at least one other element.Based on the given information, the two types of strong acids are binary acids and oxoacids. Binary acids are composed of hydrogen and one other non-metallic atom, while oxoacids contain oxygen, hydrogen, and at least one other element. In the case of oxoacids, the number of O atoms exceeds the number of ionizable protons by two or more.
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which of the following element is not in group vii of the periodic table
Answer:
Oxygen group element, also called chalcogen, any of the six chemical elements making up Group 16 (VIa) of the periodic classification—namely, oxygen (O), sulfur (S), selenium (Se), tellurium (Te), polonium (Po), and livermorium (Lv). ... Modern version of the periodic table of the elements (printable).
It can be difficult to differentiate a system at equilibrium from a system containing a?
It can be difficult to differentiate a system at equilibrium from a system containing a very slow chemical reaction.
It can be difficult to differentiate a system at equilibrium from a system containing a very slow chemical reaction because the phase that moves slowly needs more time to complete because it may entail numerous other processes.
As an illustration, a reactant would need to diffuse as well as migrate to a certain reaction site before the next change can be implemented, which then immediately creates a product.
It can be challenging to distinguish an equilibrium system from one that has: Depending on the circumstances, a reversible reaction may only take place in one direction and the reverse reaction may not contribute much.
Equilibrium is influenced by the system's temperature, pressure, as well as concentration. When one of these variables changes, the system's equilibrium is upset and it returns to normal itself so that it reaches equilibrium again.
Therefore, It can be difficult to differentiate a system at equilibrium from a system containing a very slow chemical reaction.
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Scientists believe that more distant galaxies formed when?
1.first
2.last
3.fast
4.slow
Answer: By my guess the milky way took very long to form after the big bang so 4 should be your answer.
Explanation:
A fifty gram block of ice with an initial temperature of –25°C is warmed continually in a sealed container until it becomes fifty grams of water vapor at 125°C. Which of the following transitions requires absorption of the greatest amount of heat energy?
Group of answer choices
warming up the water vapor from 100°C to 125°C
warming up the water from 0°C to 100°C
boiling the water at its boiling point
warming up the ice from –25°C to 0°C
melting the ice at its melting point
Answer:
The transition that requires the absorption of the greatest amount of heat energy is boiling the water at its boiling point.
Boiling water at its boiling point requires a significant amount of energy because it involves the phase transition from a liquid to a gas. During this transition, the water absorbs heat energy to break the intermolecular bonds and convert from a liquid state to a gaseous state. This process requires a large amount of energy compared to other transitions such as warming up the water or ice, where the temperature changes within a specific phase.
Therefore, out of the given options, boiling the water at its boiling point requires the absorption of the greatest amount of heat energy.
Explanation:
A student uses a solution of potassium hydroxide to titrate a solution of nitric acid. Which question is the student trying to answer?
A. What is the concentration of nitric acid?
B. How much nitric acid solution is present?
C. What is the concentration of potassium hydroxide?
D. How many moles of potassium hydroxide are present?
I'll give brainliest
Answer:B. How much nitric acid solution is present?
Explanation:
Answer:
A. What is the concentration of nitric acid?
Explanation:
Titrations are used to find the unknown concentration of a substance as the phenolphthalein indicator helps to indicate when there is enough base to neutralize the acid.
Using this information along with a chemical formula it is possible to work out the unknown concentration of the acid with the known volume you used of the base.
Hope this helps!
Compared to 3.011 × 10²³ atoms of Na, 1.0 mole of Carbon
A. has the same number of atoms
B. has twice as many atoms
C. not enough information
D. has half as many atoms
Compared to 1.0 mole of H₂S (molar mass 334 g/mol), 1.0 mole of NH₃ (molar mass 17g/mol)
A. has half the number of molecules
B. not enough information
C. has twice the number of molecules
D. has the same number of molecules
Thank you!
1. B. has twice as many atoms
2. D. has the same number of molecules
Further explanationThe mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
1.
3.011 × 10²³ atoms of Na, 1.0 mole of Carbon
1 mole Carbon = 6.02.10²³ atoms, so 1 mole of Carbon B. has twice as many atoms of Na
2.
1.0 mole of H₂S (molar mass 334 g/mol), 1.0 mole of NH₃ (molar mass 17g/mol)
Both have the same number of moles, so they have the same number of molecules
1.0 mole of NH₃ D. has the same number of molecules as 1.0 mole of H₂S