10 g of glucose present in 100g of water.
A hospital is a medical facility that provides patient care using specialized medical and medical support staff and medical equipment.
Hospitals and facilities are constructed, staffed, and equipped for the diagnosis of disease. For medical and surgical treatment of the sick and injured. And for their accommodation during this process. Modern hospitals often also serve as a testing and teaching centers.
Hospitals complement and enhance the effectiveness of many other parts of the healthcare system by providing ongoing services for both acute and complex illnesses. They focus scarce resources on a well-planned referral network to efficiently meet the health needs of the population.
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The Lewis diagram for NOBr is: Br The electron-T pair geometry around the N atom in NOBr is There is/are lone pair(s) around the central atom_ So the geometry of NOBr is The Lewis diagram for NOzF is: 6-N=& The electron-pair geometry around the atom in NOzF is There is/are lone pair(s) around the central atom, so the geometry of 'NOzF is Submit Answer Retry Entire Group more group attempt remaining
The molecular geometry of NOBr is bent, and the electron geometry is trigonal planar.
In other words, two atoms are joined together. On the nitrogen, there is only one isolated pair.
What does the term NOBr mean?The chemical compound with the chemical formula NOBr is nitrosyl bromide. It is a red gas that condenses at a temperature that is just below ambient.
N's number of bonds in NOBr is how many.The connection between N and O in nitrosyl bromide contains one sp2 hybrid orbital and one p atomic orbital. Between N-Br and N-O, N in NOBr contains a total of two single bonds.
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aleks a chemist must dilute of aqueous potassium permanganate solution until the concentration falls to 179 mm. he'll do this by adding distilled water to the solution until it reaches a certain final volume. calculate this final volume, in liters. round your answer to significant digits.
This final volume, in liters is 0.0285 L.
given that :
molarity M1 = 0.139 M
volume V1 = 0.016 L
molarity M2 = 0.179 M
volume V2 = ?
M1 V1 = M2 V2
V2 = M1 V1 / M2
V2 = ( 0.319 × 0.016 ) / 0.179
V2 = 0.0285 L
Thus, a chemist must dilute of aqueous potassium permanganate solution until the concentration falls to 179 mM. he'll do this by adding distilled water to the solution until it reaches a certain final volume. this final volume, in liters is 0.0285 L.
This question is incomplete , the complete question is :
A chemist must dilute 16 mL of 319 mM aqueous potassium permanganate solution until the concentration falls to 179 mM. he'll do this by adding distilled water to the solution until it reaches a certain final volume. calculate this final volume, in liters.
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Which option describes a situation in which reduction occurs?(1 point)S2– becoming S
a. Cl2 becoming Cl–
b. Al becoming Al3+
c. Xe2+ becoming Xe6+
In that reaction, reduction has taken place when the oxidation number is reduced, resulting in Cl2 becoming Cl.
How does oxidation work?Oxidation is the process in which a reactant oxidises during a reaction. Reduction is the term used to describe a reaction in which a reactant picks up electrons. This happens frequently when acid and metals interact. Oxidation is the process in which a reactant oxidises during a reaction.
Who or what causes the oxidation?Oxidation occurs when an element, peptide, other ion loses one or maybe more electrons during one chemical reaction. While oxidation is happening, the oxidation status of the chemical species rises. Oxygen is not always required for oxidation to occur. The expression was first used to describe how oxygen caused significant ion transfer during a process.
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Please label she components of a common filter setup and answer the folowing question. All items will be used. Büchner funnel correct. rubber adaptor is item allows twovacuum connection eces of glass to fit gether to form a seal. Büchner f filter flask vacuum connection rubber adaptor unne filter flask What are two uses of a vacuum filtration setup? Select all that apply. crystallization of a solid from a solution separation of a solution and a precipitate drying a filtered solid storage of a solutionPlease label she components of a common filter setup and answer the folowing question. All items will be used. Büchner funnel correct. rubber adaptor is item allows twovacuum connection eces of glass to fit gether to form a seal. Büchner f filter flask vacuum connection rubber adaptor unne filter flask What are two uses of a vacuum filtration setup? Select all that apply. crystallization of a solid from a solution separation of a solution and a precipitate drying a filtered solid storage of a solution
The items that are applied to her observations are crystallization of a solid from a solution separation of a solution and a precipitate drying a filtered solid.
Buchner funnels are used withinside the laboratory for vacuum-assisted liquid filtering. In natural chemistry, those funnels are used to acquire recrystallized compounds due to the fact they assist dispose of moisture from the very last product. A clear out out funnel is a laboratory funnel used for keeping apart solids from beverages thru the laboratory procedure of filtering. In order to obtain this, a cone-like formed piece of clear out out paper is normally folded right into a cone and positioned in the funnel. The suspension of strong and liquid is then poured via the funnel.
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Complete question:
Please label she components of a common filter setup and answer the following question. All items will be used. Büchner funnel correct. rubber adaptor is item allows two vacuum connection aces of glass to fit together to form a seal. Büchner f filter flask vacuum connection rubber adaptor u filter flask What are two uses of a vacuum filtration setup? Select all that apply. crystallization of a solid from a solution separation of a solution and a precipitate drying a filtered solid storage of a solution.
Name one substance in the diagram that would
have a net movement out of the cell. (The beaker has 5% ionide, 85% water, 10% protein, The cell has 90% water, 5% starch, and 5% glucose)
The substance in the diagram that would have a net movement out of the cell is Water.
What substance would move from the cell?The substance that will have to have a net movement out of the cell would need to first be in the cell. The only substances in the cell are water, starch, and glucose.
Water will be the most likely substance to have a net movement out of the cell thanks to the process of osmosis which allows water molecules to move from an area of high concentration to an area of low concentration across a semi - permeable membrane. This happens until the concentration gradient is the same across the semi - permeable membrane.
The water in the cell is 90 % which means it is 5 % more than the 85 % water in the beaker. Water would therefore move out of the cell in a net movement until the concentration is the same in the beaker and the cell.
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What parameter does the detector measure directly? Absorbance b) Total incident light shining on the cuvette (o) c) Light transmitted through the cuvette (Wn) d) Wavelength
Total incident light shining on the cuvette is the parameter that the spectrophotometer's detector measures directly.
A spectrophotometer is a device used to gauge electromagnetic radiation strength at various wavelengths. The spectrophotometer measures the light intensity of a sample by passing a light beam through it. The following are some of the parts of a spectrophotometer:
Light Source: The spectrophotometer needs a light source to produce lights.
Lens collimator:This lens directs the light from the light source to a monochromator or prism.
Detectors: These are photosensitive tools, like photocell detectors, that generate current proportional to the amount of light that strikes them.
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Freckles are dominant (F) over no freckles (f). If both parents are heterozygous. Determine the genotype and phenotype ratios. (5 points)
Answer: If both parents are heterozygous for freckles, then they each have a genotype of Ff. This means that each parent has one dominant allele for freckles and one recessive allele for no freckles. When these two parents mate, their offspring will have a genotype that is a combination of the genotypes of the two parents.
Explanation:
There are four possible combinations of genotypes that the offspring could have: FF, Ff, ff, and Ff. The first three genotypes are possible because each parent has a 50% chance of passing on each of their two alleles to their offspring. The fourth genotype, Ff, is possible because the offspring could inherit one F allele from one parent and one f allele from the other parent.
The genotype ratios for the offspring of these two heterozygous parents would be 1:2:1. This means that there is a 25% chance that an offspring will have the genotype FF, a 50% chance that it will have the genotype Ff, and a 25% chance that it will have the genotype ff.
The phenotype ratios for the offspring of these two heterozygous parents would be 3:1. This means that 75% of the offspring will have freckles, and 25% of the offspring will not have freckles. This is because the genotypes FF and Ff both result in the freckles phenotype, while the genotype ff results in the no freckles phenotype
Which one of the following is NOT a strong electrolyte? A) LiOH B) HNO3 C) KBr D) NH4CI E)HNO2
Among the given options, formic acid is not an example of strong electrolyte and it is a weak electrolyte and it is a weak carboxylic acid.
Which are not strong electrolytes?
HCOOH is a weak electrolyte. Rest all are strong acids and they completely disassociates into ions.
Is HCl not a strong electrolyte?
Hydrogen chloride is a strong electrolyte, and it dissolves in water completely to form Hydrogen ions and chlorine ions.
Is NH4OH a strong electrolyte?
NH4OH is a weak electrolyte as it is only slightly ionize or dissociates in water. Hence, it does not dissociate completely into ions and value of Kb is low.
What are the 7 weak electrolytes?
Weak Electrolytes and their Examples
Examples of weak electrolytes include acetic acid (CH3COOH), carbonic acid (H2CO3), ammonia (NH3), hydrogen fluoride (HF), hydrogen cyanide (HCN), and pyridine (C2H5N), etc
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What is the correct name for HF (aq)?
a. monohydrogen fluoride
b. hydrofluoric acid
c. fluoric acid
d. hydrogen fluorate
e. hydrofluorate acid
The correct name for HF (aq) is Hydrofluoric acid which means option b is the correct choice.
Hydrofluoric acid is a solution of hydrogen fluoride in water. Solutions of HF are colorless, acidic and distinctly corrosive. It is used to make maximum fluorine-containing compounds; examples consist of the usually used pharmaceutical antidepressant medicine fluoxetine and the fabric PTFE. The nature of this acid is highly corrosive due the hydrogen ions of the acid and it is toxic in nature due to the presence of flouride ions. Hydrofluoric acid or Hydrogen Fluoride (HF) is deadly if inhaled, if swallowed, or in touch with pores and skin. It reasons intense pores and skin burns and eye damage.
Therefore, option b is the correct choice.
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Why is Venus called Earth's "sister planet"?
Venus now and again referred to as Earth's “sister planet” or Earth's twin. It is a terrestrial planet due to comparable size, mass, proximity to the Sun, and bulk composition to the ones of the Earth's.
Venus has lengthy been taken into consideration Earth's dual sister. The planets are very comparable in a few respects and proportion many bodily and orbital characteristics: internal planets. Venus is the second one planet from the Sun. As an indoors planet to Earth, Venus seems in Earth's sky in no way a ways from the Sun, both as morning famous person or night famous person.
Hence, Venus is called Earth's sister planet due to the fact each planets are plenty much like every other.
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increasing permeability of the membrane to potassium will have what effect on the membrane potential?
The membrane would become more adverse as a result.The membrane would become more negative if the membrane's potassium permeability increased.
What occurs when a potassium-permeable membrane is more permeable?Similar to this, the gradient in sodium ion concentration tends to encourage their entry into the cell.However, potassium ions are significantly more able to pass through the cell membrane than sodium ions are.As a result, sodium ions diffuse into the cytoplasm more slowly than potassium ions.
What changes to the membrane permeability when the sodium or potassium permeability is increased?When sodium permeability rises to a point that sodium entrance outweighs potassium departure, depolarization turns into a self-sustaining process, or an action potential forms, the barrier cell membrane voltage is attained.
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Calculate the limiting reactant for
4AsCl3+6H2O——> As406+12HCl
The limiting reactant is the one with the least mole ratio.
How to calculate the limiting reactant ?It is limiting to use the reactant with the smallest mole ratio. Magnesium is the limiting reactant, with a predicted stoichiometric mole ratio of 4.12.
By dividing the number of moles of each reactant by its stoichiometric coefficient in the balanced chemical equation, you may determine which reactant is the limiting one. Calculate the maximum number of moles of product that can be produced from the limiting reactant using mole ratios.
4AsCl3+6H2O——> As406+12HCl
As4O6 + 12HCl --> 4AsCl3 + 6H2O
Balance: As4O6 + Hal --> AsCl3 + H2O
AsCl3 + H2O -->As4O6 + Hal
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how much heat is absorbed or released in the reaction of 20.0 g of nh3 with sufficient oxygen to produce no (g) and h2o (l)?
1062.3 KJ heat is absorbed or released in the reaction of 20.0 g of nh3 with sufficient oxygen to produce no (g) and h2o (l).
The heat absorbed or released in the reaction of 20.0 g of NH3 with oxygen to produce NO and H2O depends on the specific conditions of the reaction and the enthalpy change associated with the reaction.
The general equation for the reaction of NH3 with oxygen to produce NO and H2O is:
4NH3 + 5O2 -> 4NO + 6H2O
The enthalpy change for this reaction, which is the heat absorbed or released during the reaction, can be calculated using the enthalpy changes of formation of the reactants and products. The enthalpy change of formation is the heat absorbed or released when a substance is formed from its elements in their standard states.
The enthalpy change of formation of NH3 is -46.2 kJ/mol, the enthalpy change of formation of O2 is 0 kJ/mol, the enthalpy change of formation of NO is +90.3 kJ/mol, and the enthalpy change of formation of H2O is -285.8 kJ/mol.
To calculate the enthalpy change for the reaction, we can use the following equation:
ΔH = (4 x -46.2 kJ/mol) + (5 x 0 kJ/mol) - (4 x +90.3 kJ/mol) - (6 x -285.8 kJ/mol)
This gives us an enthalpy change of -902.8 kJ/mol.
To convert this to the heat absorbed or released for 20.0 g of NH3, we need to multiply by the number of moles of NH3 used in the reaction. The molar mass of NH3 is 17.0 g/mol, so 20.0 g of NH3 is equal to
20.0 g / 17.0 g/mol = 1.18 moles of NH3.
The heat absorbed or released in the reaction of 20.0 g of NH3 with oxygen to produce NO and H2O is therefore -902.8 kJ/mol x 1.18 moles = -1062.3 kJ.
This means that the reaction absorbs 1062.3 kJ of heat from the surroundings.
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which will show maximum depression in freezing point when concentration is 0.1 M?
A. NaCl
B. Urea
C. Glucose
D. K2SO4
K2SO4 has the most ions out of the options, which means its freezing point will degrade the most. A collective attribute that depends on the quantity of particles is the depression in freezing point.
How do melting and freezing points differ?
The temperature at which a material becomes liquid or solid is known as the melting or freezing point of that substance. Various solids have various melting points.
What in chemistry is the freezing point?
Definition of the freezing point The temperature at which a liquid, under atmospheric pressure, transitions from a liquid to a solid is known as the freezing point. Both the solid and liquid states coexist at the freezing point because these two phases, liquid and solid, are in balance there.
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2.why is the reaction mixture extracted with sodium bicarbonate? give an equation and explain its relevance.
R - CO - OH + NaHCO3 → R - CO-O- Na+ + H20 + CO2
Here Sodium bicarbonate solution is used to neutralize the excess acetic acid and the acid catalyst in the reaction mixture.
In this reaction the product sodium acetate salt is formed which can be easily removed during work up because of its complete solubility in water. The exact reaction is as follows. Baking soda or bicarbonate of soda is the popular term for sodium bicarbonate, which has the chemical formula NaHCO3 and is also known by its IUPAC designation, sodium hydrogen carbonate[9]. A sodium cation (Na+) and a bicarbonate anion (HCO3) combine to form the salt. In spite of frequently appearing as a fine powder, sodium bicarbonate is a crystalline white solid. It tastes similar to washing soda, with a mildly salty, alkaline flavor (sodium carbonate). Nahcolite is a type of naturally occurring mineral. It is a part of the mineral natron and is present in many mineral springs as a dissolved substance. Due to its long history of use and variety of names, including baking soda, bread soda, cooking soda, and bicarbonate of soda, the salt is frequently seen next to baking powder in supermarkets.
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Why is NaH a strong base?
When NaH is dissociated, the hydride ion (H) is created, and when NaOH is dissociated, OH is created.
Additionally, the reaction has a very high equilibrium constant, which indicates that the NaH is completely dissociating in water and becoming a strong base.Sodium hydride, often known as NaH or Na+:H-, is the sodium salt of the conjugate base of H2. Strong foundation NaH is very basic, yet it is not nucleophilic. NaH is a base with a broad range of applications in organic chemistry. As a superbase, it may deprotonate a variety of Brnsted acids, including weak ones, to produce the equivalent sodium derivatives.
The goal of NaH [a strong base] is to deprotonate the alcohol, converting it into H2 in the process.
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a mixture of xenon and helium gases, at a total pressure of 733 mm hg, contains 9.81 grams of xenon and 0.946 grams of helium. what is the partial pressure of each gas in the
The partial pressure (P) Xe = 203 mm Hg & (P) He = 648 mm Hg
According to Dalton's Law of partial pressure , Partial pressure of gas in mixture = X gas ( P total )
Where X gas is mole fraction of gas.
First calculate no. of moles & mole fraction of each gas.
We know that , No. of moles = Mass / Molar mass
therefore No. of moles of Xe ( n Xe ) = 9.81 g / ( 131.30 g /mol ) = 0.074 mol
therefore No. of moles of He ( n He ) = 0.946 g / ( 4.00 g / mol ) = 0.2365 mol
Mole fraction of Xe = Moles of Xe / Total moles of gas = n Xe / ( n Xe + n He )
therefore Mole fraction of Xe = 0.074 / ( 0.074 + 0.2365 ) = 0.2383
Mole Fraction of He = n He / ( n Xe + n He )
therefore Mole fraction of He = 0.2365 / ( 0.074 + 0.2365 ) = 0.7616
Partial pressure of Xe = 0.238 ( 851 mm Hg ) = 203 mm Hg
Partial pressure of He = 0.761 ( 851 mm Hg ) = 648 mm Hg
ANSWER : P Xe = 203 mm Hg & P He = 648 mm Hg
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14. Classifying The following are balanced
equations for chemical reactions. Classify
each of the equations as synthesis,
decomposition, or replacement.
a. 2 Al + Fe₂O3-
→2 Fe + Al₂O3
b. 2 Ag+S →→→→ Ag₂S
c. CaCO3 → CaO + CO,
d. 2 NO + O₂ → 2 NO₂
-
a. 2 Al + Fe₂O3-
→2 Fe + Al₂O3
b. 2 Ag+S →→→→ Ag₂S
c. CaCO3 → CaO + CO,
d. 2 NO + O₂ → 2 NO₂
-
refer again to the graph. in which region is the enzyme saturated with substrate?
Enzyme saturation with the substrate occurs in Region C.
The enzyme is a compound that serves as a catalyst in living things and controls the rate at which chemical processes take place without changing itself in the process.
All biological activities in living things involve chemical reactions, and most of them are controlled by enzymes. Many of these reactions wouldn't occur at an observable rate without the help of enzymes. All facets of cellular metabolism are catalyzed by enzymes. This involves the breakdown of major nutritional molecules (such as proteins, carbs, and lipids) during digestion; the storage and transformation of chemical energy; and the synthesis of cellular macromolecules from smaller precursor molecules. A lack of a specific enzyme is the cause of many inherited human disorders, including albinism and phenylketonuria.
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a solution of the amino acid tryptophan has an absorbance at 280 nm of 0.54 in a 0.5 cm cuvet. if the molar absorptivity is 6.4 x 103 m-1 cm-1, what is the concentration of the solution?
1.68×10⁻⁴mol L⁻¹,8.4×10⁻⁵mol/litre is the concentration of the solution
According to the beers - lamberts law:-
A=Ebc------(1)
where,A= Absorbance
E=molar absorbtivity
b=length of the cuvette
c=concentration of the solution
(1) Give that,A=0.54 at d=280mm
b=0.5cm
E=6.4×10³L mol⁻¹cm⁻¹
c=?
∵A=Ebc
c=A/bE
c=0.54/0.5×6.4×10⁻³
c=0.168×10⁻³
c=1.68×10⁻⁴mol L⁻¹
(2) If A=0.3547,E=8435m⁻¹cm⁻¹,b=0.5cm,c=?
c=A/bE
c=0.3547/0.5×8435
c=0.84×10⁻⁴m
c=8.4×10⁻⁵m
so,concentration of the was found to be 8.4×10⁻⁵mol/litre
Concentration in chemistry is defined as the quantity present in a mixture in excess of its total volume. It is possible to distinguish between the four different sorts of mathematical descriptions: mass concentration, molar concentration, number concentration, and volume concentration. Any type of chemical mixture can be referred to by the term "concentration," however solutes and solvents in solutions are most usually mentioned. Osmotic concentration and normal concentration are two variations of the molar (amount) concentration.
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Why is FeCl3 a Lewis acid?
FeCl3 is a Lewis acid because it has an empty d orbital that can accept electrons from a Lewis base. The empty d orbital allows FeCl3 to form a coordinate covalent bond with a Lewis base, forming a Lewis acid-base complex. This empty d orbital is not filled by the three chloride ions, making it an excellent Lewis acid.
In the Lewis theory of acid-base reactions, bases donate electron pairs and acids gain electron pairs. Therefore, a Lewis acid is any substance that: B. H+ ions that can accept unbonded electron pairs. In other words, Lewis acids are electron pair acceptors. A Lewis base is a substance that: OH ions that can donate unbonded electron pairs. Therefore, Lewis bases are electron pair donors.
An advantage of Lewis theory is how it complements models of redox reactions. Redox reactions involve the transfer of electrons from one atom to another with a net change in the oxidation number of one or more atoms.
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Benzene contains six carbon atoms bonded in a ring. Which best describes these bonds?
A six identical double bonds
B three identical single bonds alternating with three identical double bonds
C six identical bonds, each a hybrid between a single bond and a double bond
D six identical single bonds
B. Three identical single bonds alternating with three identical double bonds
The chemical bonding structure of benzene consists of six carbon atoms bonded together in a ring. In this structure, there are three single bonds and three double bonds, which are arranged in an alternating pattern around the ring. This bond arrangement is known as an aromatic bond and is characteristic of aromatic compounds such as benzene.
It is characterized by its high stability and low reactivity, which are due to the delocalization of the electrons in the ring.
a sample contains 116.9 grams of nacl dissolved in 1.0 l of water. what is the molarity of this solution?
The molarity of a solution of 116.9g of Nacl in 1l water is 2M.
What is molarity of a solution?
A solute's molar concentration is the quantity of that solute in one unit of a solution. It can be measured in mol/L, mol/dm3, or mol/m3. Molarity is the number of moles of solute present per liter of solution
Here,
We know molarity of a solution = moles of solute/litres of a solution
No of moles in 116.9g of nacl=2 (since 1 mole of Nacl=58.5g)
Volume of water= 1l
Therefore molarity of the solution is 2mol/1l= 2M
Hence the molarity of a solution of 116.9g of Nacl in 1l water is 2M.
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What is the oxidation number sulfur in H2S?
The oxidation number sulfur in H₂S is -2.
A compound's total number of oxidations must be zero.
The two hydrogen atoms in the chemical hydrogen sulfide, H₂S, each have an oxidation number of +1, making a total of +2. As a result, the compound's sulfur has an oxidation number of -2, and the total number of oxidations is 0.
Assume that the sulfur atom in H₂S has an oxidation number of x.
S be x.
Now,
2+x=0
⇒x=−2
What is oxidation number?The total number of electrons that an atom either receives or loses in order to create a chemical connection with another atom is known as the oxidation number, also known as the oxidation state.
Depending on whether we are taking into account the electronegativity of the atoms or not, these phrases can occasionally have a distinct meaning. Coordination chemistry commonly makes use of the phrase "oxidation number."
What distinguishes an oxidation number from an oxidation state?In contrast to the oxidation state, which indicates how oxidised an atom is in a molecule, the oxidation number describes the charge that the core metal atom will retain once all ligands have been removed.
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. which of the package labels below would indicate the lowest external radiation hazard? a. radioactive yellow-ii. b. radioactive white-i. c. radioactive yellow-iii.
The Radioactive White-I label is attached to packages with extremely low levels of external radiation.
When transporting low-level radioactive materials, what form of packaging is used?Excepted Packaging is used to carry radioactive materials that have extremely low amounts of radioactivity. Excepted packaging is permitted for small amounts of radioactive material that would represent a very minimal risk if discharged in an accident.
Type C packaging is an overpack for the transport of radioactive materials with no activity restrictions by any mode of transportation, including airplanes. The Type C package must retain its containment after impacting a target at 90 m/s (this is similar to a fall from a height of 450 m).
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in a redox-reaction that uses starch as an indicator, the solution turns blue-black. what can we say about that reaction?
Answer:
The reaction is nutride-cullic and sees all math about our lives.
Explanation:
a breath of air has a volume of 1.05 l at a pressure of 740. torr and body temperature, 37oc. calculate the number of molecules in the breath
The number of molecules in the breath: 2.71 × 10²² molecules
What is ideal gas equation?PV = nRT denotes the ideal gas equation. In this equation. P stands for the ideal gas's pressure, V for its volume, n for the total amount of ideal gas expressed in moles, R for the universal gas constant, and T for temperature in this equation.
Given that:
Pressure (P) = 740.0 torr
= (740.0/760) atm
= 0.9737 atm
Volume (V) = 1.05 L
Temperature (T) = 3.7°C
= (3.7+273) K
= 276.7 K
find the number of moles using:
P×V = n×R×T
0.9737 atm × 1.05 L = n × 0.08206 atm.L/mol.K × 276.7 K
or, n = 4.5 × 10⁻² mol
Thus, the number of molecules = number of mol × Avogadro’s number
= 4.5 × 10⁻² mol × (6.023 × 10²³) molecules/mol
= 2.71 × 10²² molecules
Answer: 2.71 × 10²² molecules.
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butanoic acid has a partition coefficient of 3.0 (favoring benzene) when distributed between water and benzene. find the formal concentration of butanoic acid in each phase when 100.0 ml of 0.10 m aqueous butanoic acid is extracted with 25.0 ml of benzene at a ph of 4.00.
The formal concentration of butanoic acid in water phase = 0.060 M.
The formal concentration of butanoic acid in benzene phase = 0.0157 M.
given that :
volume of aqueous phase = 100 mL
volume of benzene = 25 mL
pH = 4
partition coefficient = 3
pH = - log [H⁺]
[H⁺] = 10⁻⁴ M
distribution coefficient is given as :
D = K [H⁺] / [H⁺] + Ka
Ka for the butanoic acid is 1.52 × 10⁻⁵
D = 93 × 10⁻⁴ / 10⁻⁴ +) 1.52 × 10⁻⁵
D = 2.60
fraction of the butanoic acid in water phase :
q = v1 / v1 + Dv2
q = 100 / 165
q = 0.60
concentration of the water phase = 0.60 × 0.10 M
= 0.060 M
moles of benzoic acid = (0.10 × 100) / 100
= 0.010 mol
mole fraction fraction of benzene phase :
1 - 0.060 = 0.394 mol
moles in benzene phase = 0.394 × 0.01 = 0.0039 mol
concentration = 0.0039 / 0.025
= 0.157 M
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in the following reactions, which species is oxidized? question 15 options: a) cu b) none, this is not a redox reaction. c) fe d) o e) s
In this reaction the oxidation number of hydrogen increases that is oxidation of hydrogen and the reduction of Copper occurs.
What is redox reaction ?Any chemical process in which a participating chemical species' oxidation number changes is an oxidation-reduction reaction, often known as a redox reaction.
It is also clear that this is a reduction reaction because the oxidation number for copper decreases from +2 in Cu2+ to 0 in copper. Since oxidation involves the loss of electrons, 2H2O is oxidized when it loses 4 electrons to create O2.
The given reaction is :
CuO + H₂ = Cu + H₂O
in this reaction the oxidation number of hydrogen increases that is oxidation of hydrogen and the reduction of Cu occurs.
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identify the compound that has hydrogen bonding. identify the compound that has hydrogen bonding. ch3ch3 hi h2 hf (ch3)3n
The chemical compound HF, or hydrogen fluoride, acts as both a hydrogen donor and acceptor during the process. It exhibits hydrogen bonding because the fluoride is linked to the hydrogen atom in this reaction. Option C is the correct option.
HF molecules are held together by a covalent bond or the strong hydrogen bonding between a hydrogen and a fluorine atom. Given that it contains a potent electronegative ion, fluorine can act as both a hydrogen acceptor and donor. This material exhibits hydrogen bonding as a result.
In chemistry, a hydrogen bond is a relatively strong attraction between an electronegative atom, which is generally the acceptor of the bond, and also an electronegative atom that is covalently bound to a higher electronegative donor atom or group. This attraction is termed to be electrostatic in general.
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