237.9 KJ/mol⁻¹ crystal-field splitting energy is found to absorb visible light.
What is crystal-field splitting energy?The energy of the electron configuration in the ligand field less the energy of the electronic configuration in the isotropic field is known as the crystal field energy.
The core metal ion's d orbitals split into two groups with various energies in an octahedral complex. The energy of the electron transition, which is related to the wavelength of the emitted light, is equal to the energy of the crystal-field splitting.
Δ = E = ℎ c / λ
Where,
where ℎ is the Planck constant, 6.62*10⁻³⁴m²kg s⁻¹, and c is the speed of light, 3 x 10⁸m s⁻¹.
Δ = 6.62*10⁻³⁴m²kg s⁻¹ / 503 x 10⁻⁹
= 3.95 x 10⁻¹⁹
= 3.95 x 10⁻¹⁹
This value is the splitting energy per ion.
To convert it to J/mol, we should multiply it by Avogadro number, 6.022 x 10²³mol⁻¹
= 3.95 x 10⁻¹⁹ x 6.022 x 10²³mol⁻¹
= 237.9 KJ/mol⁻¹
Therefore, the crystal-field splitting energy is 237.9 KJ/mol⁻¹ .
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Adding heat to a substance group of answer choices sometimes does not result in a temperature change. always results in a temperature increase. sometimes results in results in a temperature decrease.
Sometimes adding heating of substance set of answer options does not cause a change in temperature. resulting in an increase in temperature every time. results occasionally in a drop in temperature.
A substance's atoms and molecules move more quickly when it is heated. Whether the substance is a solid, liquid, or gas, this occurs. However, the temperature does not always rise when more heating of substance is added. For instance, adding heat to boiling water will not raise its temperature. This occurs when the heating of the substance reaches its boiling point, which is for all vaporizable substances. The average kinetic energy of the molecules will fluctuate when a system gains or loses heat. So long as a phase shift is not taking place, heat transfer causes a change in the system's temperature.
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Calculate the concentration of clo2− at equilibrium if the initial concentration of hclo2 is 2. 25×10^−2 m.
The concentration of ClO₂⁻ at equilibrium if the initial concentration of HClO₂ is 0.0654.
What is concentration?The concentration of any substance is the quantity of that substance in per square of the space or container.
The reaction is
HClO₂ + H₂O <=> H₃O⁺ + ClO₂⁻
The pH is 0.454 M
Ka = [H₃O⁺][ClO₂⁻ ] / [HClO₂]
2. 25 × 10⁻² m = [x][x] / 0.454-x]
2 + 0.011 - 0.004994 = 0
solve the quadratic equation
x = 0.0654 = [H3O+] = [ClO2-]
pH = -log (H3O+)
pH = -log(0.0654)
pH = 1.2
equilibrium concentrations of
[HClO2] = 0.454 -x = 0.454 -0.0654 = 0.3886 M
[ClO2- ] = x = 0.0654
Thus, the equilibrium concentrations is 0.0654.
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Based on your experience, which reactions are likely to be self-sustaining? check all that apply. an engine with pistons rising and falling. burning gasoline in a car engine a pan full of eggs floating in water. hard-boiling an egg a space ship launch. thrusting a rocket into space
The reactions which are likely to be self-sustaining from my experience among the choices above is burning gasoline in a car engine a pan full of eggs floating in water
What is self sustaining?Self sustaining simply means a condition in which one is able to continue in a healthy state without an external support outside assistance.
So therefore, the reaction which are likely to be self-sustaining from my experience among the choices above is burning gasoline in a car engine a pan full of eggs floating in water
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A sample 0. 100 moles of a gas is collected at at stp. What is the volume of the gas in liters?
A sample 0. 100 moles of a gas is collected at at STP . 2.24 is the volume of the gas in liters.
The STP means standard temperature and pressure.
At STP,
Temperature = 0 °C =273 K
Pressure = 1 atm
We get value of volume by using ideal gas equation,
PV = nRT
P is the pressure of the gas = 1 atmV is the volume occupied by the gas = ?n is the number of the moles = 1 moleT is the temperature of the gas = 273 K or 0 °CR universal gas constant = 8.31 J/ mole × KCalculation,
Since, one mole of a gas occupy 22.4 L volume at STP
So, for 0.1 mole volume occupy = 22.4L × 0.1 mole/1 mole = 2.24L
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What substance is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, cabr2(l)cabr2(l), and molten magnesium iodide, mgi2(l)mgi2(l)? assume standard conditions
Mg (Magnesium) is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, CaBr₂ (l) and molten magnesium iodide, MgI₂ (l).
What is Anode and cathode ?The anode in the cell has been the negative electrode and attracts the positive ions in the solution. The cathode has been the positive electrode, and attract negative ions.
What is Electrolysis of Calcium Bromide ?In electrolysis of Calcium bromide, Calcium will form at the cathode and Bromine will form at the anode.
The reaction is as follows:
2Br⁻ (aq) → Br₂ (g) + 2e⁻
What is Electrolysis of Magnesium Iodide ?In electrolysis of magnesium Iodide, Magnesium will form at the anode Iodine will form at the cathode.
The reaction is as follows:
2I⁻ (aq) → I₂ (g) + 2e⁻
Thus from the above conclusion we can say that Mg (Magnesium) is produced at the cathode during the electrolysis of a mixture of molten calcium bromide, CaBr₂ (l) and molten magnesium iodide, MgI₂ (l).
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Which pair of reactants will undergo aldol condensation to produce methylvinyl ketone?
When formaldehyde and acetone then react with each other( aldol condensation) then it will be formed methyl vinyl ketone.
In organic chemistry, an aldol condensation would be a condensation reaction in which an enol and enolate ion combines with a carbonyl chemical to produce a -hydroxy aldehyde or -hydroxy ketone, that is then dehydrated to produce a conjugated enone.
In aldol condensation, when formaldehyde and acetone then react with each other then it will be formed methyl vinyl ketone.
It can be written as
[tex]CH_{2} O + CH_{3} COCH_{3}[/tex] → [tex]HOCH_{2} -CH_{2} -CO-CH_{3}[/tex]
When it will be heated then it gives methyl vinyl ketones.
[tex]HOCH_{2} -CH_{2} -CO-CH_{3}[/tex] → [tex]CH_{2} =CH-CO-CH_{3}[/tex]
So, the pair of reactants will be formaldehyde and acetone
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why is it not advisable to use sodium hydrogen instead of sodium hydrogen carbonate to relieve pain after being bitten by a bee
Answer:
iron deficiency
Explanation:
How many grams of silver may be formed by the passage of 9,604 c through an electrolytic cell that contains a molten silver salt?
The grams of silver formed by the passage of 9,604 c through an electrolytic cell that contains a molten silver salt is 10.7g.
Acc. Faraday’s law of electrolysis,
W=(I×t×M) /nF
W=Faraday’s constant=96500
F=time M=molar mass
N=no. Of el.
It=9604C
Given,
Molar mass of silver=108g/mol.
n=1.
Then weight of silver deposited can be given as
W=(9604×108)/(96500×1)
= 10.7g
Thus we concluded that the silver deposited is 10.7g
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What physical property is used to separate cyclohexanone from any unreacted cyclohexanol?
Answer:
I think it involves the use of extractive distillation but I'm not sure.
Still hope it helps:-)
The physical property is used to separate cyclohexanone from any unreacted cyclohexanol is distillation.
The process for separating cyclohexanone from cyclohexanol comprises the following steps
1. reacting a mixture of ketone and alcohol with an organometallic compound M(X)n to form compound HX, wherein M is chosen from aluminium, titanium and boron, where n is the valance of a M, X denotes equal or different organic group chosen from alkyl group and electric group having up to 10 carbon atom
2. liberating the newly formed compound HS from the reaction mixture by distillation
3. separating the ketone from the organometallic compound formed by reaction between M(X)n and the alcohol in the mixture.
Thus, we concluded that above compound is seprated by forming organometallic compound.
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The chemical equation of photosynthesis includes 6o2. which best describes this substance?
The chemical equation of photosynthesis includes 6[tex]O_{2}[/tex]. -----a gas produced during photosynthesis best describes this substance
Elaborate:
During photosynthesis plants use carbon dioxide, water and sunlight to make sugar (glucose) and a waste product, oxygen gas.
the equation of this process can be:
6 [tex]CO_{2}[/tex] + 6 [tex]H_{2} O[/tex] + light energy → [tex]C_{6} H_{12} O_{6}[/tex] + 6 [tex]O_{2}[/tex]
carbon dioxide + water + light → glucose + oxygen
Is 6[tex]O_{2}[/tex] a product of photosynthesis?
In photosynthesis, energy from light is used to convert carbon dioxide and water into glucose and oxygen. For 6 carbon dioxide and 6 water molecules, 1 glucose molecule and 6 oxygen molecules are produced.
What happens to sugar water oxygen and carbon dioxide during photosynthesis?
During photosynthesis, plants take in carbon dioxide and water from the air and soil. Within the plant cell, the water is oxidized, meaning it loses electrons, while the carbon dioxide is reduced, meaning it gains electrons. This transforms the water into oxygen and the carbon dioxide into glucose.
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How many milliliters of an aqueous solution of 0. 195 m sodium sulfate is needed to obtain 4. 27 grams of the salt?
The volume of the aqueous solution of sodium sulfate required is 153.85 mL.
Number of moles of the saltThe number of moles of the salt in the given mass is calculated as follows;
moles = reacting mass / molar mass
molar mass of sodium sulfate = 142 g/mole
moles = (4.27) / (142)
moles = 0.03 mole
Volume of the aqueous solution of sodium sulfateConcentration = moles/volume in liters
0.195 = 0.03/V
V = 0.03/0.195
V = 0.15385 liters
V = 153.85 mL
Thus, the volume of the aqueous solution of sodium sulfate required is 153.85 mL.
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URGENT PLEASE HELP
In an experiment, hydrochloric acid reacted with different volumes of sodium thiosulfate in water. A yellow precipitate was formed during the reaction. A cross drawn at the base of each flask became gradually invisible due the formation of this yellow precipitate. The time taken for the cross to become invisible was recorded. A partial record of the experiment is shown.
Experimental Record
Flask Volume of
HCl Volume of
Sodium Thiosulfate Volume of
Water Time
1 10 mL 10 mL 40 mL 14 seconds
2 10 mL 20 mL 30 mL
3 10 mL 30 mL 20 mL
4 10 mL 40 mL 10 mL
Based on your knowledge of factors that affect the rates of chemical reactions, predict the trend in the last column of the experimental record. Use complete sentences to explain the trend you predicted. You do not have to determine exact values for time; just describe the trend you would expect (increase or decrease) and why it occurs.
The trend will be such that the time taken for the cross to disappear will be increasing.
Rate of reactionsThe rate of reactions is affected by the concentration of reactants. The more concentrated the reactants are, the more the rate of the reaction, and vice versa. This is based on the condition that all other factors are kept constant.
In the illustrated reaction, the volume of sodium thiosulfate decreases downward while the volume of water increases. This means that the sodium thiosulfate gets more diluted as we move downward.
Thus, the reaction rate will keep decreasing. In other words, more time would be needed for the cross to disappear as the concentration of sodium thiosulfate decreases.
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7. Which functional group is present in the following molecule?
A. An acid
B An aldehyde
C. An amide
D. An alcohol
Answer:
An amide.
Explanation:
Amides are functional groups, in which a carbonyl atom is linked by a single bond to a nitrogen atom and either a hydrogen or a carbon atom. These defining traits single this functional group out as an amide.
Cellular respiration release co2 and photosynthesis absorbs co2. these two reactions are part of which biogeochemical cycle?
The metabolic process that takes place in an organism's cells is called cellular respiration. Both photosynthesis and cellular respiration contribute carbon dioxide to the biogeochemical cycle.
What is biogeochemical cycle?
The mechanism that distributes and circulates abiotic chemical elements among the various realms of the planet is known as the biogeochemical cycle. The carbon, water, nitrogen, phosphorus cycle, etc. are all included.
Carbon dioxide is released during cellular respiration as a waste gas into the atmosphere, where it is then taken by plants to produce energy, which is then utilized by the organism, which then releases more carbon dioxide. The ecological chain's carbon cycle continues from the producer to the consumer.
Therefore, the carbon cycle is influenced by photosynthesis and cellular respiration.
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According to the iupac convention, alkyl group names should be located ________ of the name of the main chain
According to the IUPAC convention, alkyl group names should be located at the end of the name of the main chain.
What is IUPAC?IUPAC is a system of chemistry in which the naming of the organic compound has to be done based on their structure by following some rules given by the IUPAC system. Alkanes, alkenes and alkynes are the three major functional groups of organic chemistry.
The full form of IUPAC is the international union of pure and applied chemistry.
Alkyl groups are same as alkenes just the end name of both are different but both of then specifies the single bond in structure and name has to be written in last.
Therefore, according to the IUPAC convention, alkyl group names should be located at the end of the name of the main chain.
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How many protons, neutrons and electrons, in that order are present in the anion formed by one atom of 79se? group of answer choices 34, 34, 45 34, 45, 34 32, 45, 34 34, 45, 36 36, 45, 36
There are 34 protons , 45 neutrons and 36 electrons, in that order are present in the anion formed by one atom of 79Se .
Calculation
The number of electron / protons ( present in the nucleus ) of the atom is equal to atomic number .
The sum of number of electron / protons ( present in the nucleus ) and neutrons ( present in the nucleus ) of the atom is called atomic mass.
The atomic number of Se = 34
The Mass number or atomic mass of Se = 79
The anion of Se = [tex]Se^{-2}[/tex]
It means two electron loss by Se and form [tex]Se^{-2}[/tex] .
So , the difference between number of electrons and protons = 2
Hence , number of electron and proton in [tex]Se^{-2}[/tex] anion is 34 ( two less than number of protons ) and 36
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What locally acting chemicals are derived from arachidonic acid? multiple choice question. peptide hormones prostaglandins corticosteroids neurotransmitters
Prostaglandins locally acting chemicals are derived from arachidonic acid.
What does arachidonic acid produce?
Arachidonic acid is then quickly transformed into active metabolites, including prostaglandins, prostacyclin, and thromboxanes by cyclooxygenases and leukotrienes by lipoxygenases Page et al (2006). These metabolites' physiological effects are numerous and varied.Is prostaglandins a local hormone?
Prostaglandins are the most diversified group of eicosanoids and are believed to be produced in the majority of bodily tissues. This particular local hormone activates the inflammatory response and pain receptors.What is arachidonic acid found in?
Arachidonic acid can be found mainly in the fatty parts of meats and fish (largely red meat), so vegetarians usually have lower levels of arachidonic acid in the body than those with omnivorous diets. There is a great deal of controversy about arachidonic acid.Learn more about Prostaglandins
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Calculate the molality of a sulfuric acid solution containing 24. 4 g of sulfuric acid in 198 g of water
Answer:
1.26 m
Explanation:
The molality equation looks like this:
Molality = moles solute / mass solvent (kg)
In this case, sulfuric acid is the solute and water is the solvent. To calculate the molality, you need to (1) convert grams solute to moles solute (via molar mass), then (2) convert grams solvent to kilograms solvent, and then (3) calculate the molality.
(Step 1)
Molar Mass (H₂SO₄): 2(1.008 g/mol) + 32.065 g/mol + 4(15.998 g/mol)
Molar Mass (H₂SO₄): 98.073 g/mol
24.4 grams H₂SO₄ 1 mole
----------------------------- x ------------------------ = 0.249 moles H₂SO₄
98.073 grams
(Step 2)
198 grams H₂O 1 kg
------------------------- x ---------------------- = 0.198 kg H₂O
1,000 grams
(Step 3)
Molality = moles solute / mass solvent
Molality = 0.249 moles H₂SO₄ / 0.198 kg H₂O
Molality = 1.26 m
Select true or false: in the reaction ag (aq) cl–(aq) → agcl(s), ag acts as a lewis acid
In the given reaction, Ag is acting as Lewis acid. the given statement is true.
What is Lewis acid?A Lewis acid is a chemical substance with an empty orbital that can accept an electron pair from the a Lewis base to establish a Lewis adduct.
Because the silver atom has an open valence shell, AgCl is a Lewis acid. Lewis acid is an atom, ion, or molecule with an incomplete electron octet.
Even though Ag+ can accept an electron pair, it acts as a Lewis acid. It will then combine with chlorine and form AgCl.
Thus, the given statement is true.
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A 1. 30-g sample of an unknown gas occupies 798 ml at 25. 0°Cand a pressure of 1. 00 atm. Find the molar mass of the gas.
A 1. 30-g sample of an unknown gas occupies 798 ml at 25. 0°C and a pressure of 1. 00 atm the the molar mass of the gas is
Calculation ,
According to ideal gas equation ,
PV = nRT ....(i)
where P is the pressure = 1atm
V is the volume of the unknown gas = 798 ml = 0.798 L
R is the universal gas constant = 0.082 atm L /K mol
T is the temperature of the gas = 25 °C = 298 K
n is the number of moles = ?
By putting the value of pressure , volume , temperature and universal gas constant in equation ( i) we get
1 atm ×0.798 L = n×0.082×298
n = 1 atm ×0.798 L/0.082×298 = 0.0326 mole
Number of moles (n) = given mass/ molar mass
molar mass = given mass/number of moles = 1. 30 g/0.0326 mole
molar mass = 39.87 g/mol
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C3Hg has a higher lower boiling point than C₂H6-
Answer:
C₃H₈ has a higher boiling point than C₂H₆
Explanation:
The boiling point is the temperature at which the intermolecular forces between molecules are overcome and the state of the substance changes from liquid to gas.
Since these are both hydrocarbons (molecules containing just carbon and hydrogen), the strength of their intermolecular bonds should be the same. However, since C₃H₈ is larger, it can form more of these intermolecular bonds. Thus, it takes more energy and a higher temperature to overcome the increased amount of forces.
Solid iron combines with oxygen gas to form solid iron(III) oxide. Which of the following equations best describes this reaction?
(A) Ir + O₂--> IrO₂
(B) 4 Fe + 3 0₂---> 2 Fe₂O3
(C) I+ 0₂ ---> 10₂
(D) 3 Ir + 0₂ -> 6 Ir₂03
Select one:
O a. A
Ob. B
O C. C
O d. D
Answer:
B. 4 Fe + 3 0₂---> 2 Fe₂O3
Explanation:
(A) Ir + O₂--> IrO₂ No: Ir is iridium
(B) 4 Fe + 3 0₂---> 2 Fe₂O3 Yes: Fe is iron and O is oxygen, and the equation is balanced.
(C) I+ 0₂ ---> 10₂ No: I is iodine
(D) 3 Ir + 0₂ -> 6 Ir₂03 No: I is iodine
Nitrosyl fluoride (nof) has an atom sequence in which the central atom is n. what is the formal charge on the nitrogen atom?
The formal charge in the central metal atom Nitrogen atom is O.
Structure O=N=f formal charge on N = 0
Formal charge in a Lewis shape, for every atom, you need to count how many electrons. count number all of its lone pair electrons, and 1/2 of its bonding electrons. The difference among the atom's range of valence electrons and the range it owns is the formal rate
Nitrosyl fluoride is used as a solvent and as a fluorinating and nitrating agent in natural synthesis. It has additionally been proposed as an oxidizer in rocket propellants.
The guideline or method for assigning formal rate to atoms in Lewis systems is the subsequent: Formal fee = number of valence electrons - variety of lone-pair electrons + 1/2 range of bonding electrons.
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A 1. 477 g sample of khp required 30. 27 ml of naoh solution to reach endpoint. Calculate the molarity of the NaOH.
The molarity of the NaOH is 0.238 M when 1. 477 g sample of KHP required 30. 27 ml of NaOH solution to reach endpoint.
Calculation ,
Mass of KHP = 1. 477 g
Number of moles of KHP = given mass / molar mass of KHP
Number of moles of KHP = 1. 477 g × 1 mol / 204.23 g KHP = 0.007 mol
Since , one mole KHP requires one mole of NaOH .
Number of moles of NaOH required by 0.007 mol of KHP = 0.007 mol
Molarity of NaOH = number of moles / volume in lit = 0.007mol/0.03027ml = 0.238 M
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Why is 15 m acetic acid an appropriate solvent in which to perform rate studies of electrophilic bromintations?.
Acetic acid activates the bromine and makes it a better electrophile.
What is bromination?
When a substance undergoes bromination, bromine is added to the compound as a result of the chemical reaction. After bromination, the result will have different properties from the initial reactant.
Why is 15M acetic acid used as a solvent for bromination?DCM (dichloromethane) requires more time. Acetic acid has protons that can give one of the Br (bromine) a positive charge and activate it. There is a brief loss of aromaticity that calls for high energy activation.
Refer to the attached image for bromination reaction.
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The bromine is activated by acetic acid, which improves its electrophilic properties.
What is meant by bromination?When a material gets brominated, the chemical reaction causes bromine to be added to the compound. The outcome will differ from the initial reactant in terms of its properties after bromination.Why is 15M acetic acid employed as a bromination solvent?DCM (dichloromethane) takes longer to process. One of the Br (bromine) atoms can be activated by the protons in acetic acid, which can give it a positive charge. Short-lived loss of aromaticity necessitates high-energy activation.For the reaction of bromination, refer to the attached file.To learn more about electrophilic bromination visit:
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If a hydrogen atom has its electron in the n = 3 state, how much energy in ev is needed to ionize it?
The energy of the hydrogen atom will be -0.85 ev.
Ionization, also known as ionization, would be the phenomenon by which an atom or molecule gains or loses electrons to acquire a negative and positive charge, frequently in conjunction with those other chemical changes. Ions are the name for the electrically charged molecular or atom that results.
These chemicals are known as ionic compounds, with table salt serving as an example. Ionization would be the process of removing electrons from such an element as well as a molecule as well as the dissociation of an ionic material, such as salt, itself into the individual ions in a solution like water.
The energy of hydrogen atom will be calculated by using the formula:
[tex]E_{n} = -13.6 ev / n^{2}[/tex]
where, [tex]E_{n}[/tex] = energy of nth level, n is the state.
It is given that, n = 3 .
Now put the value of n in above equation.
[tex]E_{4} = -13.6 ev / 4^{2}\\E_{4} = -13.6 ev / 16\\E_{4} = -0.85 ev[/tex]
Therefore, the energy of the hydrogen atom will be -0.85 ev.
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List 4 major types of inhibition modes and clearly indicate the effect on vmax and km for each mode?
The 4 major types of inhibition are Competitive Inhibition, Non-competitive Reversible Inhibition, Non-competitive Irreversible Inhibition, and Uncompetitive Inhibition.
Types of inhibition modes:1. Competitive Inhibition: Competing inhibitors are substances that resemble an enzyme's natural substrate so closely that they vie for the active site. In order to stop additional reactions, the inhibitor binds to the active site and stays there.
The inhibitor and substrate fight for the enzyme's active site because the enzyme may react with the inhibitor and release the products as it normally would with its substrate
2. Non-competitive Inhibition:
Reversible: There is no competition in this instance because the inhibitor and substrate are not related. The substrate and the inhibitor may mix at various places of the complexes of the enzymes [E-I], [E-S], and [E-I-S].And in the Michaelis equation, this kind of inhibition lowers V max but has no impact on Km.The rate at which the enzyme is fully saturated is given by V = V max [S] / Km + [S] (V max).
(Km): The substrate is the Michaelis constant, at which the reaction rate is halved, or at V maximum.
Irreversible: These kinds of inhibitors impact the chemical alteration of an amino acid residue in the enzyme that plays a function in catalysis when they join with the enzyme nearby or at the active site.Additionally, this kind of inhibition lowers Vmax but has no impact on Km.
3. Uncompetitive Inhibition: is the last type, where the inhibitor attaches to the [E-S] complex to create [E-S-I] even if it has no affinity for the enzyme.
However, this kind of inhibition lowers both Vmax and Km.
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When using ion-selective electrodes, to compensate for a complex or unknown matrix, the _____________ method can be used to determine the analyte concentration.
When using ion-selective electrodes, to compensate for a complex or unknown matrix, the standard addition method can be used to determine the analyte concentration. Option D
What are ion-selective electrodes?Analytical chemistry is a science that deal with the measurement and detection of the accurate amount of a substance. Analytical chemistry plays a large role in environmental management as it helps in the determination of the levels of contaminants in a sample.
An ion selective electrode is used in analytical chemistry to measure the amount of a target ion by converting its activity into a measurable electrical signal.
Hence, when using ion-selective electrodes, to compensate for a complex or unknown matrix, the standard addition method can be used to determine the analyte concentration.
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An average speed for a time interval is 40 km/hr. Which is the correct time interval?
(2,20) to (4,100)
(2,20) to (4,80)
(2,20) to (3,100)
(1,20) to (3,80)
The correct time interval is (2,20) to (4,80).
What is the average velocity?The average velocity is defined as the velocity or speed of the body throughout the period of motion under consideration. This will always span the entire journey. Recall that velocity is the ratio of distance covered to time taken. The average velocity spans the entire journey and differs from the instantaneous velocity which occurs at a particular point along the journey.
Now we know that the average distance is obtained as the sum of the initial and final velocity multiplied by time and divided by two. Bear in mind that the question already contains the information that we have been told that the average velocity here is 40 km/hr. We can clearly see from the forgoing that the correct time interval is (2,20) to (4,80).
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Enter your answer in the provided box. what is the original molarity of an aqueous solution of ammonia (nh3) whose ph is 11. 02 at 25°c? (kb for nh3 = 1. 8 × 10−5) m
The original molarity of an aqueous solution of ammonia whose pH is 11. 02 at 25°C is 0.556 M
Calculation ,
Given : pH = 11.5
[tex][H^{+} ][/tex] = [tex]10^{-11.5}[/tex]
[tex][OH^{-} ][/tex] = [tex]K_{w} /[H^{+} ][/tex] = [tex]10^{-14}[/tex]/ [tex]10^{-11.5}[/tex] = [tex]10^{-2.5}[/tex] M
Kb = [tex][NH_{4}^{+} ][OH^{-} ]/[NH_{4} OH][/tex] = [tex](10^{-2.5})^{2} /C[/tex] = 1.8×[tex]10^{-5}[/tex] M
C = 1/1.8 = 0.566 M
So, molarity of an aqueous solution of ammonia is 0.566 M
pH ia a measure of hydrogen ion concentration , a measure of acidity or alkalinity of the solution .pH scale usually range from 0 to 14 Aqueous solutions at 25°C witha pH less rhan 7 are acidic , whereas , those with pH greater than 7 are basic or alkaline. pOH ia a measure of hydroxide ion concentration , a measure of alkalinity of the solution .
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