A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the chemical formula for the compound is (NH₄)₂SO₄.
The ammonium ion is a polyatomic cation - NH₄⁺ and the polyatomic anion that is sulfate ion - SO₄²⁻. The polyatomic cation and the polyatomic anion combine and for the polyatomic ionic com pounds. Ionic bond is formed between a positively charge ion and the negatively charge ion.
Thus, A compound is formed by combining a polyatomic cation and a polyatomic anion. The compound can be ammonium sulphate and the chemical formula for the compound is (NH₄)₂SO₄.
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what would a rotational spectrum look like (how many peaks would be present and how far apart would they be)? you must show how you arrived at the spacing between peaks
The rotational spectroscopy looks like many peaks joined together in the shape of parabola. The number of peaks depends on the shape of the molecule. The peaks are 2B distance apart from each other.
What is rotational spectroscopy?
Rotational spectroscopy is an absorption spectroscopy where the energies of transitions between the energy levels of a molecule in the gas is measured. It is also called as microwave spectroscopy. Rotational spectroscopy only works on the molecules which have permanent dipole moment.
In rotational spectroscopy each line represents a transition between energy levels.
E = BJ (J+1)
where J = energy level, B = rotational constant.
When the transition is from J = 0 to J = 1,
E = E(f) - E(i) = B x 1 (1+1) - B x 0 (0+1) = 2B - 0B = 2B.
Therefore, the spacing between the peaks in Rotational spectroscopy is 2B. The number of peaks depends on the shape of the particular molecule.
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Determine the number of valence electrons and what the atoms charge will be when it forms an ion
a. O
Answer:
You determine the valence electrons by using the Periodic Table.
Let's assume you're using a table that has the groups numbered 1-18.
The electron configurations of ions are those of the neutral atoms plus or minus a number of electrons equal to the charge on the ion.
Name the following structure. (Points)
Thank you, image is attached !
IUPAC nomenclature of structure 1 is 5-bromo-3-ethyl-2,2-dimethylhexane and for structure 2 it is 1,1,4-trimethyl-3 -(1-methylethyl)cyclohexane
IUPAC nomenclature is based on naming a molecule's longest chain of carbons connected by single bonds, whether in a continuous chain or in a ring. All deviations, either multiple bonds or atoms other than carbon and hydrogen, are indicated by prefixes or suffixes according to a specific set of priorities
In structure 1 the longest chain was found to be a 6 carbon chain and the numbering started from the side where it is highly substituted. Hence the name is 5-bromo-3-ethyl-2,2-dimethylhexane
In structure 2 we have a cyclic structure and so the numbering will be done in such a way that all the substituent gets the least numbering hence the name of the compound will be 1,1,4-trimethyl-3 -(1-methylethyl)cyclohexane
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what is the common characteristic of the electron configurations of the elements ne and ar? in which group would you find them?
Common characteristic of the electronic configuration of neon and argon have is their complete outer shell.
Neon (10) - 1s2, 2s2, 2p6
Argon (20) - 1s2, 2s2, 2p6, 3s2, 3p6
as we can see both the configurations have an complete outer shell means their octet is complete. This is the common characteristic of both the elements.
The both of them lie in group 8A that is the noble gases or inert gas.
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a mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg. if the partial pressure of water vapor is 17.5 mm hg, calculate the mole fraction of hydrogen in the mixture
A mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg. if the partial pressure of water vapor is 17.5 mm hg, the mole fraction of hydrogen in the mixture is 0.976 mol of hydrogen.
given that :
total pressure = 738 mmHg
partial pressure of water vapor = 17.5 mmHg
Total pressure = partial pressure of hydrogen +partial pressure water vapor
partial pressure hydrogen gas = total pressure-partial pressure water vapor
= 738 - 17.5
= 720.5 mmHg
now the , the partial pressure is given as :
partial pressure of hydrogen gas = mole fraction × total pressure
mole fraction of hydrogen gas = partial pressure / total pressure
= 720.5 / 738
= 0.976 mol of hydrogen
Thus, A mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg. if the partial pressure of water vapor is 17.5 mm hg, the mole fraction of hydrogen in the mixture is 0.976 mol of hydrogen.
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What is the volume in liters of hydrogen gas that would be produced by the reaction of 55.0 g of Al with excess HCl at STP according to the following reaction?
2 Al (s) + 6 HCl (aq) → 2 AlCl₃ (aq) + 3 H₂ (g)
Answer:
About 68.495 L hydrogen gas
Explanation:
based on the wavelength that the cobalt(ii) chloride solution absorbed most strongly, what color light did the copper(ii) sulfate solution absorb most strongly?
Copper(II) sulfate is pale blue (cyan) because it absorbs light in the red region of the spectrum.
What is Spectrophotometry ?Spectrophotometry is the branch of electromagnetic spectroscopy that deals with the quantitative measurement of reflectance or transmission properties of materials as a function of wavelength.
A method of measuring how much light a chemical absorbs by measuring the intensity of light as it passes through a sample solution. The basic principle behind spectrophotometry is that each compound absorbs or transmits light in a specific wavelength range.
Copper(II) sulfate solution appears blue because it actually absorbs red region of spectrum which is a complementary color of blue.
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calculate the heat (q) in kj released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree celsius. the specific heat of water is 4.18 j/(g*c).
The heat (q) in kJ released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree Celsius. the specific heat of water is 4.18 J/(g °C) is 14397.17 J.
given that :
The specific heat capacity is given as :
q = mc ΔT
where ,
m = mass = 801 g
c = specific heat capacity = 4.18 J/g °C
ΔT = change in temperature = 4.3 °C
q = heat = ?
now, by solving the values we get :
q = mc ΔT
q = 801 × 4.18 × 4.3
q = 14397.17 J
Thus, The heat (q) in kJ released with combustion of methanol using 801 grams of water and the change in temperature is 4.3 degree Celsius. the specific heat of water is 4.18 J/(g °C) is 14397.17 J.
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Explain the relationship of oxidation numbers to electron confguration for Groups IA through VITA. How can an atom's electron configuration be predicted on the basis of its location in the periodic table?
The oxidation numbers of the elements show us the number of electrons lost or gained which is traceable from the electron configuration which in turn depends on the group that the atom belongs to.
What is the oxidation number?
The oxidation number is the number of charges that an atom appears to have. We know that the elements that we find in the groups IA through VIA only have a narrow range of oxidation numbers. This is because the oxidation numbers does depend on the number of electrons that the atom can be able to loose or gain at a time.
We know that each of the groups are known by the maximum number of electrons that can be found on the outermost shell of the atom. This is part of the electron configuration of the atom. Thus, if we know the group that an atom belongs to, we can at least tell the outer electron configuration of the atom because we know that all the atoms in that group have the same outer electron configuration.
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in the laboratory you dissolve 21.0 g of potassium phosphate in a volumetric flask and add water to a total volume of 375 ml. what is the molarity of the solution ? m. what is the concentration of the potassium cation ? m. what is the concentration of the phosphate anion ? m.
The molarity of the solution is 0.264 M.
Molarity is the quantity of a substance in a certain volume of solution. Molarity is defined as the moles of a solute in line with the liters of an answer. Molarity is likewise referred to as the molar attention of a solution.
calculation:-
mass = 21 g
the molar mass of potassium phosphate = 212 g
moles = mass/ molar mass
= 21 / 212
= 0.099
Volume = 375 ml =0.375 L
molarity = number of moles/volume in liter
= 0.099 / 0.375 L
= 0.264 M
Molar concentration is the degree of the concentration of a chemical species, especially of a solute in a solution, in terms of the amount of substance in step with the unit quantity of the answer. In chemistry, the maximum generally used unit for molarity is the number of moles per liter, having the unit image mol/L or mol/dm³ in SI unit.
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incorrect your answer: not given ammonium perchlorate nh4clo4 is the solid rocket fuel that was used by the u.s. space shuttle and is used in the space launch system (sls) of the artemis rocket. it reacts with itself to produce nitrogen gas n2, chlorine gas cl2, oxygen gas o2, water h2o, and a great deal of energy. what mass of oxygen gas is produced by the reaction of 6.54g of ammonium perchlorate? round your answer to 3 significant digits.
The amount of oxygen formed when 6.54 grams ammonium perchlorate reacted is 0.89 grams.
The balanced chemical equation of the reaction of ammonium perchlorate is,
2NH₄ClO₄ → N₂ + Cl₂ + 2O₂ + 4H₂O
From the reaction it is clear that,
2 moles of ammonium perchlorate = 2 moles of oxygen
Moles of ammonium perchlorate = Moles of oxygen
Moles = Formed/reacted mass/molar mass.
Molar mass of Ammonium perchlorate is 117 g/mol.
Molar of oxygen is 16 g/mol.
Mass of NH₄ClO₄ is 6.54 grams.
Putting values,
6.54/117 = formed mass of oxygen/16
Formed mass of oxygen = 0.89 grams.
So, the mass of oxygen formed is 0.89 grams.
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a certain aqueous solution boils at 375.60 k (at 1 atm). at what temperature does the same solution freeze?
The aqueous solution here would freeze at -9.163 degree celsius.
The temperature at which it boils is 375.60 K. This gets converted into Celsius = 102.45-degree Celsius (i)
The standard temperature of boiling is = 100 degree Celsius (ii)
The standard temperature of freezing is = 0 degrees celsius (iii)
We know the formula -
Depression in cooling/ Elevation in boiling = [tex]K_{b}[/tex] / [tex]K_{f}[/tex] (iv)
The standard values for both Ks are 0.5 and 1.87 respectively. (v)
Using the given values of (i), (ii), (iii), (iv), and (v), we find that -
= (102.45 - 100.00) / (0 - x) = 0.5 / 1.87
x, here is the temperature for freezing.
= Temperature at which it freezes = - 9.163 degree Celsius.
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A 59.3 g sample is heated to 98 °C and placed in a calorimeter containing 150.0 g of water. The water temperature rises from 19.0°C to 27.5 °C when energy transfer is complete. Calculate the specific heat of the sample
The specific heat of the object can be obtained as 1.3 J/Kg/°C.
What the specific heat capacity of the sample?We know that energy can neither be created nor destroyed. The meaning of this is that, when the object looses heat, the heat must be transferred to the water since the heat energy can not be lost.
Thus;
Heat lost by the object = Heat gained by water.
Let us denote the heat lost using a negative sign.
Then;
H = mcdT
H = heat lost/ gained
m = mass of the object
dT = temperature change
Then;
-(59 * c * (27.5 - 98)) = 150 * 4.18 * (27.5 - 19))
4159.5c = 5329.5
c = 5329.5/4159.5
c = 1.3 J/Kg/°C
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• Which has more potential energy; a bird sitting on the roof of a skyscraper or a bird sitting on top of a house?
The term that has more potential energy is bird sitting on the roof of a skyscraper.
What is the bird's potential energy?Due to its height above the ground, it has potential energy, and because it is moving, it has kinetic energy. Because of this, a bird in flight has both kinetic and potential energy.
Norte that Potential energy in physics is the energy that an item gets to retains as a result of its position in relation to other objects, internal tensions, electric charge, or other elements.
Therefore, Higher objects have more potential energy since they will fall further. The gravitational potential energy is highest for the heavier of two objects at the same height.
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Force, Motion, and Newton's Laws (8.6 A and C):Question 3
A swimmer swims across a swimming pool. At the end
of the pool she turns around and pushes off the wall with
her feet. Which option describes a pair of action-
reaction forces during the push?
Select one:
O The force of her feet on the wall and the force of
the wall on her feet.
O The force of gravity on her body and the force of
her feet on the wall.
O The force of gravity on her body and the force of
the wall on her feet.
O The force of her feet on the wall and the force of
the water on her front
K
Option C. Choice describes a couple of movement-reaction forces for the duration of the frenzy: The force of gravity on her body and the force of the wall on her feet.
Newton's laws of motion are 3 fundamental laws of classical mechanics that describe the connection between the motion of an object and the forces acting on it. those legal guidelines may be paraphrased as follows: A body stays at relaxation, or in movement at a steady speed in a straight line, unless acted upon through pressure.
Within the first regulation, an object will not alternate its motion unless pressure acts on it. inside the 2nd law, the force on an item is equal to its mass times its acceleration. inside the third law, when two objects interact, they practice forces on each other of identical value and opposite routes. Newton's 2nd regulation is one of the most important in all of physics. For a frame whose mass m is regular, it is able to be written inside the shape F = ma, in which F (pressure) and an (acceleration) are both vector quantities. If a body has a net force acting on it, its miles are multiplied in accordance with the equation.
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a 625- ml sample of unknown hcl solution reacts completely with na2co3 to form 17.1 g co2 . what was the concentration of the hcl solution?
According to the given statement 1.24 M was the concentration of the hcl solution.
What is the HCI solution?One of the main tools for connecting, managing, and running networked enterprise applications in a failover clustering infrastructure is a hyper - converged architecture (HCI) solution (HCI). Organizations may virtualize data, servers, and networks thanks to technology.
Briefing:The balanced reaction is 2 HCl + Na₂CO₃ ==> CO₂ + H₂O + 2 NaCl
This shows that each mole of CO₂ created results in
There are two moles of HCl needed. So, starting with the atomic weights of carbon and oxygen, let's determine how many moles of CO₂ were produced.
Atomic weight carbon = 12.0107
Atomic weight oxygen = 15.999
Molar mass CO₂
= 12.0107 + 2 * 15.999
= 44.0087 g/mol
Moles CO₂ = 15.1 g / 44.0087 g/mol = 0.388559535 moles
We know we needed twice as much HCl based on the balanced equation,
so 0.388559535 mol * 2 = 0.77711907 mol
Simply divide the amount of moles by the number of liters because molarity is defined as moles per liter,
so: 0.77711907 mol / 0.625 l = 1.24339051 mol/l
Since our data only has three significant figures, round it to three figures to get 1.24 m.
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what volume, in l, of 10.0 m hcl is needed to make 2.00 l of 2.00 m hcl solution by dilution with water?
To make 2.00 l of 2.00 m HCl solution by dilution with water, the volume of 10.0 m HCl needed is 0.4 l.
Dilution is defined as the process in which the concentration of a sample is decreased by adding more solvent. The dilution formula is given below.
C₁V₁ = C₂V₂
where C₁ = initial concentration of sample = 10.0 m
V₁ = initial volume of sample
C₂ = final concentration after dilution = 2.00 m
V₂ = total final volume after dilution = 2.00 l
Plug in the values to the formula and solve for the volume of the solution needed.
V₁ = C₂V₂/C₁
V₁ = (2.00 m)(2.00 l)/(10.0 m)
V₁ = 0.4 l
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in the laboratory you dissolve 20.0 g of silver acetate in a volumetric flask and add water to a total volume of 125 ml. what is the molarity of the solution ? m. what is the concentration of the silver cation ? m. what is the concentration of the acetate anion ? m.
The molarity of the solution is 0.95M and the concentration of the Silver cation and the concentration of the acetate anion is also 0.95M.
The mass of the Silver Acetate dissolved in the water of volume 125 ml is 20 grams.
We can write the reaction of the dissolution of the Silver Acetate into water as,
CH₃COOAg = CH₃COO- + Ag+
It means that the concentration of the Silver cation and the Acetate anion is equal in the solution of water.
It means that the molarity of the solution will be equal to the concentration of the Silver cation and the concentration of the Acetate and iron in the water.
We know that the molarity of the solution is defined as the number of moles of solute per unit volume of the solution in litres.
Moles = mass/molar mass
Molar mass of the Silver Acetate is 166.91 g/mol.
The mass of silver Acetate dissolved is 20 grams.
So, the moles of silver Acetate is,
Moles = 20/166.91
Molarity of the solution,
Molarity = moles of silver acetate/volume of water
Molarity = 20/166.91 × 1000/125
Molarity = 0.95
So, the molarity of the Silver Acetate solution is 0.95M.
The concentration of the Silver cation and the concentration of the Acetate anion will be same as that of the molarity of the solution.
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As soon as you realize that you are in danger, you feel your heart speed up. You feel very aware of your surroundings. Your whole body is preparing to run or fight for your life. Which of the following would be the response of your nervous system?
A)heart rate speeds up
B)body moves to a safer place
C)senses become sharper so you are better able to respond
D)stress hormones are transported around the
Answer:
C would be the nervous system reacting
If you wanted to know about the other answers:
A and D are the circulatory system since it's transporting stress hormones through the blood and the heart rate speeds up
B is the muscular and skeletal system since they are the ones that make your body move
At room temperature , 15.0 grams of zinc will occupy
At room temperature 15 grams of zinc will occupy 2.10 cm3
What is density of an element?
When atoms occupy a specific volume of space, their mass and number are measured by the periodic table's element densities. The quantity of mass in a particular volume, commonly expressed as grams per cm3 or g/cm3, is the density, which is a measurement of the number of particles in a certain volume of a substance.
Given the mass of zinc is 15 grams.
The density of zinc in room temperature is 7.14 g/cm^3
Density = mass/ volume
Volume = mass / density
Volume = 15/ 7.14 = 2.10 cm3
Hence, at room temperature 15 grams of zinc will occupy 2.10 cm3.
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hydrogen gas and nitrogen gas react to form ammonia gas. what volume of ammonia would be produced by this reaction if 2.9 ml of hydrogen were consumed?
On balancing the reaction of formation of ammonia we know that for every one mole of Nitrogen gas, we need three moles of Hydrogen gas to produce, two mole of the ammonia.
We are given with volume of Hydrogen gas i.e. 2.9 ml and are asked to determine the volume of ammonia
Since the volume of hydrogen is given as 2.9 ml = 2.9/1000 l
Mole of hydrogen =2.9/(22.4)(1000)
Mole of hydrogen = 0.129/1000 moles of H₂
Get the number of moles of NH₃
Number of moles of NH₃ = 2/3 of moles of Hydrogen
Number of moles of NH₃ = 2/3 * 0.129/1000 moles of H₂
Number of moles of NH₃ =0.0863/1000 moles of NH₃
Get the volume of ammonia NH₃
Volume of ammonia produced = 0.0863 * 22.4
Volume of ammonia produced = 1.933 ml
Hence the volume of ammonia that would be produced by this reaction if 2.9 ml of hydrogen were consumed is 1.933 ml
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what are the spectator ions in the reaction between aqueous hydrobromic acid and aqueous sodium hydroxide?
Na⁺ and Br⁻ are the spectator ions in the reaction.
Those ions which do not participate in the chemical reaction and are present on both sides of the reaction i.e. reactants side and the products side are known as spectator ions. The reaction between aqueous hydrobromic acid and aqueous sodium hydroxide is as follows:
HBr (aq) + NaOH (aq) → NaBr (aq) + H₂O (l)
As clear from the above equation that HBr, NaOH and NaBr are completely ionized in water and the complete equation with ions is as follows:
H⁺ + Br⁻ + Na⁺ + OH⁻ → Na⁺ + Br⁻ + H₂O
So Na⁺ and Br⁻ are the ions which are taking part in the reaction and also present on both sides of the arrow so these two ions are spectator ions.
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calculate the work associated with the expansion of a gas from 42.0 l to 79.0 l at a constant pressure of 13.0 atm.
The work associated with the expansion of a gas is 481 atm. L.
When a gas expands at constant pressure than for a small change in volume dv work done is dw = p dv.
The volume changes from u to v at constant pressure p, then the work done is:
dw = p (v - u)
When the work is done by the system against external pressure then dw = pdv
w = [tex]\int\limits^v_u {p} \, dv[/tex]
So by calculating we get:
dw = 13( 79 - 42)
= 13× 37
= 481 atm. L
Therefore we get the work done in 481 atm. L.
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A scientist has 4 pieces of copper. Each piece is a different shape and size (samples A 1 p through D). The student measures the volume and the mass of one sample, but measures only the volume or only the mass of the other samples. Since the scientist knows that copper is a substance, the scientist claims that she can predict what the mass will be of sample B and C. She also claims she can predict what the volume will be of sample D. Use the table below to calculate the MASS OF SAMPLE. Type ONLY THE NUMBER in the space below.
The value of the mass (B) will be equal to 9 grams and volume (D) will be equal to 5 cm^{3}.
What is density ?
Density is the degree of ways much “stuff” is in a given quantity of space. For example, a block of the heavier detail lead could be denser than the softer, lighter detail gold (Au). A block of Styrofoam is much less dense than a brick. It is described as mass in line with unit volume.
You can consider it, as how tightly or loosely packed a substance is, or how compact it is. Solids are commonly denser than beverages, and beverages denser than gases, however there are numerous exceptions.
Density is a bodily assets of matter, as every detail and compound has a completely unique density related to it. Density described in a qualitative way because the degree of the relative "heaviness" of gadgets with a regular volume.
Copper's Density is nearly equal to 9 and density is equal to mass/volume.
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An iron nail is composed of four sotopes with the Percentage abundances given in the table below average Calculate the average atomic mass of iron Isotopes - Percentage
fe-54 - 5.80
fe-56 - 91.72
fe-57 - 2.20
fe-58 - 0.28
The average atomic mass of iron Isotopes is 55.90 amu.
What is the average atomic mass?We know that because there is a phenomenon that we call isotopy, the average atomic mass of the elements is often not a whole number. The atoms of the elements tend to differ in the number of the neutrons that they posses. Thus isotopes are the atoms of the same elements that do not have the same number of neutrons.
We now have to obtain the relative atomic mass of the iron atom while taking note of the different isotopes that we gave in the atom as we can see.
We thus have;
(54 * 5.80/100) + (56 * 91.72/100) + (57 * 2.20/100) + (58 * 0.28/100)
= 3.13 + 51.36 + 1.25 + 0.16
= 55.90 amu
The average atomic mass of the iron as we can see from the calculation that is based on the table is obtained as 55.90 amu.
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at what temperature would the population of the first excited vibrational state of hcl be 1/e times its population of the ground state?
At 14.52 K, the population of the first energy level is 1/e times that of the ground state.
Temperature and the energy difference between the levels affect the relative population of particles in certain rotating levels. The excitation of particles from one level to another is caused by a rise in temperature.
HCl has a rotational constant (B) of 10.59 cm⁻¹
Identify the ground state's and the first rotational level's energies.
The formula is used to calculate the energy of a rotational level.
E = hcBJ (J + 1)
The rotating level's energy is represented by E (in J).H stands for the Planck constant.The symbol for the speed of light is c.The rotational constant is denoted by B.The level of rotational energy is denoted by J.Following is the calculation of the energy of the ground state (J = 0):
E = hcBJ (J + 1)
E = 6.626 * 10⁻³⁴ J s * 2.998 * 10¹⁰cm s⁻¹ * 10.59 cm⁻¹ * 1 (1 + 1)
E = 4.207 * 10⁻²² J
Using the provided formula, the population of rotational level J in comparison to the ground state is computed.
[tex]\frac{N_{j} }{N_{0} } = 2J + 1 [ \frac{-E_{j} }{_{e}k_{B}T }[/tex] --- (I)
The J-level population is known as [tex]N_{j}[/tex]
N is the ground state's population.
The Boltzmann constant is [tex]k_{B}[/tex]
The temperature is T.
The answer to the query is
N₁ = 1 / e (N₀)
N₁ / N₀ = 1 / e ⇒ (II)
Equate (I) and (II)
1 / e = [2 (1) + 1] [tex][ \frac{-E_{j} }{_{e}k_{B}T }][/tex]
1 / 2.718 = (3) (-4.207 * 10⁻²² J) / (1.381 * 10⁻²³ J K⁻¹ * T)
0.368 = 3 * (-4.207 * 10⁻²² J) / (1.381 * 10⁻²³ J K⁻¹ * T)
0.368 = 3 * e (-30.46 K / T)
Simplifying the above expression:
0.368 = 3 * e (-30.46 K / T)
In 0.368 = In 3 + (-30.46 K / T)
-0.999 = 1.098 - (30.46 K / T)
(-30.46 K / T) = 1.098 + 0.999
Solving for T:
(30.46 K / T) = 1.098 + 0.999
(30.46 K / T) = 2.097
T = 30.46 K / 2.097
Therefore, 14.52 K is the temperature where the first energy level's population is 1/e times that of the ground state.
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COMPLETE QUESTION:
At what temperature would the population of the first rotational level of HCl be 1/e times the population of the ground state? The rotational constant for HCl, B, is equal to 10.59 cm⁻¹
.
. an organic compound containing c, h, and o was analyzed by combustion. 6.237 g of the compound yielded 8.845 g carbon dioxide and 5.438 g of water. find the empirical formula of the compound. c
The empirical formula of the compound is CH3O
What is Combustion ?
Combustion is an exothermic, high-temperature redox chemical reaction between a fuel (reductant) and an oxidant (usually oxygen in the atmosphere), producing oxidized, often gaseous, gases in a mixture called smoke. A shaped product is produced. Combustion does not always lead to fire, as the flame is only visible when the substance undergoing combustion is vaporized, but when this occurs, the flame is a characteristic indicator of the reaction. Activation energy must be overcome to initiate combustion (for example, by starting a fire using a lit match), but the heat of the flame provides enough energy to make the reaction self-sustaining can provide.
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a 25.00 ml sample of koh is titrated with 21.83 ml of 0.2120 m hcl(aq). what is the concentration of the koh solution?
The molarity or the molar concentration of the KOH solution is 0.18M.
The equation of reaction for KOH and HCl is,
KOH + HCl → KCl + H₂O
As we can see,
Moles of KOH = Moles of HCl.
We also know,
Moles = molarity x volume.
Molarity of KOH x Volume of KOH = Molarity of HCl x Volume of HCl
Volume of KOH is 25 ml.
Molarity of HCl is 0.212M.
Volume of HCl is 21.83 ml.
Putting values,
Molarity of KOH x 25 = 0.2120 x 21.83
Molarity of KOH = 0.18M.
The concentration of KOH solution is 0.18M/.
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How many Hershey's Kisses are in 2 OWLS?
Answer:
20
Explanation:
owls are 10 of anything 10x 2 =20
It seems as though the value of the owl is up to you though
Hopes this helps
(d)
A teacher collected two tubes full of hydrogen gas, as shown in figure 3
She tested tube A with a lighted splint as soon as she took the bung out.
She tested tube B with a lighted splint a few seconds after taking the bung out.
(1) Suggest why tube B gave a much louder pop than tube A.
Answer:
Explanation:
This practical can be used to introduce the idea that the relative amounts of a fuel and oxygen (from air) are important in combustion, and that there will be an optimum ratio in which the two substances react. This leads on to the idea of chemical equations.
In the case of a class experiment, where students generate the hydrogen themselves under strict supervision, all the hydrogen generators must be collected once the test tubes have been filled and before any flames are lit, to prevent the possibility of accidental or deliberate ignition of the hydrogen in the generator. This has caused a number of accidents in the past. Alternatively the test tubes could be filled with hydrogen beforehand, or by students under supervision, from a steady cylinder supply.
