C2H4, N2, and H2 are the right order from most entropy to least entropy.
What is entropy?Entropy is a measureable physical characteristic and a scientific concept that is frequently connected to a state of disorder, randomness, or uncertainty. Entropy is the measurement of the amount of thermal energy per unit of temperature in a system that cannot be used for productive work. Entropy is a measure of a system's molecular disorder or randomness because work is produced by ordered molecular motion. Ice melting is the ideal illustration of entropy. The individual molecules are arranged and fixed as ice. The molecules become disorganized as the ice melts because they are now free to move. The molecules are then liberated to move independently through space as the water is heated to become a gas.
Here,
My justification is that C2H4 will have the most entropy because it has the greatest number of microstates. Then, because something is likely to have more microstates the larger it is, I based N2 and H2 on their weights (which indicate size).
The correct order from most to least entropy is C2H4, N2, and H2.
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1. I. CH₂=CH-CH₂
II, CH₂-C
CH₂
III.
CH₂
1Ct₂
Which of the following orders is correct for the stability of these radicals?
a) I > II > III
c) I > III > II
b) III >II>I
d) III >1>II
Answer:
Option A: I > II > III.
Explanation:
The stability of radicals depends on the number of bonds and electrons they have. In general, radicals with more bonds and electrons are more stable than those with fewer bonds and electrons.
In this case, the correct order of stability of the radicals is option (a) I > II > III.
I. CH₂-C• is the most stable radical because it has the most number of bonds and electrons, it has 4 sigma bonds and 4 pi electrons.
II. CH₂• is less stable than I because it has 3 sigma bonds and 2 pi electrons.
III. CH• is the least stable of the three radicals because it has only 2 sigma bonds and 1 pi electron.
Option III >II>I, or III >1>II, is not correct because it doesn't match with the stability order of the given radicals.
State 4 evidences to show
that matter Consists of particles
Answer:
All matter are composed of small particle which is known as atom.The atom cannot be divided into smaller particle, atom can neither be created nor can destroyed.All atoms in same element have same mass and properties.More that one atom combine to form compound.if 25 milliliters of 0.80 m hcl is used to completely neutralize 40 milliliters of naoh solution, what is the molarity of the base? group of answer choices 5.0 m 50 m 0.05 m 0.50 m
The base has a molarity of 0.5M if 25 milliliters of 0.80M HCl are used to fully neutralize 40 milliliters of NaOH solution.
How do you determine molarity?The following expression can be used to determine a solution's molarity:
M1V1 = M2V2
Where M1 is the acid's molarity.
M2 stands for the base's molarity.
V1 is equal to the acid's volume.
V2 is the volume of the base.
25 × 0.80 = 40 × M2
20 = 40M2\sM2 = 20/40\sM2 = 0.5M
As a result, the molarity of the base is 0.5M if 25 milliliters of 0.80 M HCl are used to totally neutralize 40 milliliters of NaOH solution.
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The amount of carbon 14 present after t years is given by the exponential equation A(t)=A0ekt, with k=− ln2/5600. Using carbon 14 dating of charcoal found along with fossilized leaf fragments, botanists arrived at an age of 48,000 years for a plant. What percent of the original carbon 14 in the charcoal was present?
The exponential formula (A/Ao) x 100 ≈ 2.63 x 10-3 x 100 ≈ 0.263 gives the quantity of carbon 14 that was present after t years, meaning that 0.263 % of the original was still there.
What is a carbon's purpose?Metals are melted using coke made from coal and charcoal, two forms of impure carbon. Inside the steel and iron sectors, it is particularly crucial. Pencil leads, electric motor brushes, and furnace linings all include graphite. For filtration and purification, activated charcoal is employed.
Are people harmed by carbon?This information on health risks is predicated on exposures with carbon black, and elemental carbon. Chronic inhalation of carbon black can harm the heart and lungs, either permanently or temporarily.
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Translate the given conformer from the wedge-and-dash drawing into its Newman projection. (Hint: first decide whether the confirmation is staggered or eclipsed) Select the correct Newman projection below, and drag the three groups (X, Y, and Z) to their correct locations.
The given conformer from the wedge-and-dash drawing into its Newman projection is attached below.
What is Newman projection?With the front atom represented by the point where three lines intersect (a dot) and the back atom represented by a circle, a Newman projection shows how a chemical bond will behave from front to back. The front atom is referred to as proximal, and the back atom as distal.
With a line representing the front atom and a circle representing the back carbon, the Newman projection, which is helpful in alkane stereochemistry, shows how a chemical bond will behave from front to back. It is referred to as proximal for the carbon atom in the front and distal for the one in the back.
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Complete question is attached below.
how many moles of o are in 1 mole of al(no3)3?
a. 3 mol b. 9 mol c. 12 mol d. 1 mol e. 6 mol
In total, there are nine oxygen atoms in every one aluminum nitrate. Since one mole of aluminum nitrate contains nine moles of oxygen, the answer will be nine when discussing mole units.
How many O atoms make up an Al no2 3 compound?
Each unit of aluminum nitrate's chemical formula comprises three nitrate ions, as can be seen by looking at the compound's chemical formula. Additionally, three oxygen atoms make up each nitrate ion. This indicates that there are nine oxygen atoms in one formula unit of aluminum nitrate.
How many oxygen atoms are there in al2o3?
Aluminum oxide has three oxygen atoms because its structure is made up of two aluminum atoms bound to two oxygen atoms each.
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Calculate the percent ionization of 8.0×10−3 M butanoic acid (Ka=1.5×10−5) B. Calculate the percent ionization of 8.0×10−3 M butanoic acid in a solution containing 8.0×10−2 M sodium butanoate.
4.325% of 8.0 × [tex]10^{-3}[/tex] M butanoic acid be ionised, while only 0.018% of 8.0 ×[tex]10^{-3}[/tex] M butanoic acid be ionised in a solution that contains 8.0 ×[tex]10^{-2}[/tex] M sodium butanoate.
Ionization: What is it?Ionization is any process that involves adding or removing electrons to change electrically neutral molecules or atoms (ions) into electrical charges atoms or molecules (ions).
A. [Butanoic acid] = 8.0*10−3 M
Ka = 1.5*10∧-5
Butanoic acid ionizes as:
HA ⇄ H+ + A-
Initially 8.0*10−3 0 0
Finally 8.0*10−3 - x x x
Ka = x*x / 8.0*10−3 - x
1.5*10−5 = x*x / 8.0*10−3
1.2*10^-7 = x*x
x = 3.46*10^-4 M
Percent ionization = (3.46*10^-4 / 8.0*10−3) * 100
= 4.325 %
B). [Sodium butanoate] = 8.0*10^-2 M
HA ⇄ H+ + A-
Initially 8.0*10−3 0 0
Finally 8.0*10−3 - x x 8.0*10^-2 + x
Ka = x*(8.0*10^-2 + x) / 8.0*10−3 - x
1.5*10−5 = x*8.0*10^-2 + x*x / 8.0*10−3
1.2*10^-7 = x*x + x*8.0*10^-2
x*x + x*8.0*10^-2 - 1.2*10^-7 = 0
x = 1.49*10^-6 M
Percent ionization = (1.49*10^-6 / 8.0*10−3) * 100
= 0.018 %
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7. The percent by mass of chlorine in C2H5Cl is A) 51.94% B) 53.94% C) 64.94% D) 54.94%
The percent by mass of chlorine in C2H5Cl is D) 54.94%.
In C2H5Cl, The molecular weight of C2H5Cl is (12.01 + (2*1.01) + 35.45) = 64.47 g/mol
The weight of chlorine in the compound is 35.45 g/mol.
The mass percent of chlorine in the compound can be calculated by (mass of chlorine/total mass) x 100%.
Therefore, (35.45/64.47) x 100% = 54.94%
So, The percent by mass of chlorine in C2H5Cl is 54.94%.
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3. When atoms bond, the electron configuration of each atom in the bond
resembles those of the nearest
1.Halogen
2.Noble Gas
3.Alkaline earth metal
4.Alkali metal
Answer:
Noble gas
Explanation:
Noble gases are the most stable elements on the periodic table, so every element aims to bond in a way that will make them have the same number of valence electrons as the noble gases. Valence electrons are the electrons in the outer ring of an element. Noble gases have eight valence electrons, which is the most possible. All elements aim to be unreactive in this manner. Hope this helps!
use the information in the aleks data tab to sort the following chemical species by reducing power.
species : Zn(s) ; Ni(s) ; Ag(s) ; Na(s)
reducing power : choose one choose one choose one choose one
As per the aleks data tab the chemical species can be given as per the following: Ag<Zn<Mg<Na
This is not a redox reaction. None of the species are reduced and none are oxidized.
The decreasing power will be greater the lower the reduction potential.
A chemical reaction known as an oxidation-reduction (redox) reaction includes the exchange of electrons between two substances. An oxidation-reduction reaction is any chemical process in which a molecule, atom, or ion experiences a change in its oxidation number as a result of gaining or losing an electron.
Redox reactions are those in which one chemical is reduced and another is oxidized. Here, oxygen is being introduced, which causes C to oxidize into CO, and oxygen is being removed, which causes ZnO to decrease to Zn. It is a redox reaction as a result.
Redox reactions are those in which there is a change in the oxidation number, with both an increase and a drop in number.
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if 4.0 l of a 4.9 m srcl2 solution is diluted to 40. l , what is the molarity of the diluted solution?
The concentration terms are molality, normality and mole fraction. Molarity can be used to find out the ionic strength of any solution. Therefore, 0.49M is the molarity of the diluted solution.
What is molarity?Molarity can be calculated by dividing number of moles of solute by volume of solution in litre. Molarity is affected by temperature. Its unit is mole/liter. It measure the concentration of any solute in a solution.
Mathematically,
According to the neutralization law,
M₁V₁=M₂V₂
where,
M₁ = molarity of stock solution =4.9 M
V₁ = volume of stock solution = 4.0l
M₂ = molarity of dilute solution =M₂
V₂ = volume of dilute solution = 40l
substituting all the given values we get
M₁V₁=M₂V₂
4.9 ×4.0=M₂×40
M₂=0.49M
Therefore, 0.49M is the molarity of the diluted solution.
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A 0.1 m solution is diluted by three orders of magnitude. what is the new concentration?
0.1 m solution is diluted by three orders of magnitude. The new concentration is 0.0001M.
What is meant by solution?A homogenous mixture of one or more solutes that have been dissolved in a solvent is referred to as a solution. A solute dissolve in a solvent to form a homogenous mixture. Solute: A material that dissolves in a solvent to form a homogenous mixture.
In chemistry, a solution is a homogeneous mixture of two or more compounds in relative proportions that can be constantly changed up to what is referred to as the limit of solubility. Although the term "solution" is frequently used to refer to the liquid state of matter, solutions of gases and solids are also possible.
Calculation:The new concentration will be 0.1/10x10x10 = 0.0001 m
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At 700 K, CCl4 decomposes to carbon and chlorine. The Kp for the decomposition is 0.76.Find the starting pressure of CCl4 at this temperature that will produce a total pressure of 1.2 atm at equilibrium.P=?
The starting pressure of CCl₄ at this temperature that will produce a total pressure of 1.2 atm at equilibrium pressure P is 0.69atm.
In terms of pressure, what is equilibrium constant?It is described as the ratio of the partial pressures of the reactants to those of the products, both raised to a power that is equal to the coefficients of the respective reactants and products in a balanced chemical equation. This indicates by Kp.
CCl₄ ⇄ C (s) + 2Cl₂
Initial p 0 0
equilibrium p-x 0 2x
Total pressure at equilibrium = p - x + 2x = p + x = 1.2---eq(1)
Kp = 076 = Pc ×P²cl/Pccl₄
Kp = 0×(2x)²/p-x
Kp = 4x²/p-x ---eq(2)
Solving equation (1) and (2). we get x = 0.51
p + x = 1.2
p = 1.2 - 0.51 = 0.69 atm
The starting pressure of CCl₄ is 0.69 atm.
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0.50 moles of gas take up 10.5 L
of space under constant pressure
and temperature conditions.
What volume is required to hold
2.0 moles of the gas?
Answer:
The volume required to hold 2 moles of the gas is 42 L
Explanation:
By setting up mole and volume ratio:
moles : volume
0.50 : 10.5
2.0 : X
thus X would be equal to:
(2.0 x 10.5)/0.50
= 21/0.50
= 42 L
Answer: 42
Explanation:
Which properties of an element are determined by valence electrons?
Select all correct answers.
electricity conduction
magnetism
atomic mass
O reactivity
The valence electrons play a major role in determining the chemical characteristics of the elements. Due to their shared valence shell electron arrangement, the elements in a group have comparable chemical characteristics.
Why are there electrons in an atom?The negatively charged atom's electrons are responsible for this. An atom's total negative charge, which is produced by all of its electrons, counteracts the positive charge of the protons in the atomic nucleus. In comparison to all the other atom's constituents, electrons are quite tiny.
Why is it that our bodies require electrons?To carry electrical currents, our cells have been specially designed. We cannot move or think without the help of electricity, which the nervous system needs to deliver impulses to the brain and throughout the body.
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Answer:
Explanation:
The correct answerers are Magnetism, Reactivity, and Electricity conduction.
a. What is the electron-domain (charge-cloud) geometry of BrF5? Enter the electron-domain geometry of the molecule.
b. What is the molecular geometry of BrF5?
c. Ignoring lone-pair effects, what is the smallest bond angle in BrF5?
d. Which choice best describes the polarity of BrF5?
The molecule is polar and has polar bonds.
The molecule is nonpolar and has polar bonds.
The molecule is polar and has nonpolar bonds.
The molecule is nonpolar and has nonpolar bonds.
(a) Electron domain geometry - Octahedral. (b) Molecular geometry - Square pyramidal. (c) Smallest bond angle - 90° (d) The polarity of BrF₅, best choice is: The molecule is polar and has polar bond. (e) AsH₃ is polar molecule.
A molecule's valence shell electrons are shown in a very simple manner via a Lewis structure. It serves as a visual representation of how the electrons surrounding certain molecules' atoms are positioned.
It demonstrates the bonds that exist between a molecule's atoms and its lone pairs of electrons. When used in conjunction with hybrid orbitals, Lewis structures can also be helpful in predicting molecular geometry.
(a) Electron domain geometry - Octahedral.
(b) Molecular geometry - Square pyramidal.
(c) Smallest bond angle - 90°
(d) The polarity of BrF₅, best choice is: The molecule is polar and has polar bond.
(e) AsH₃ is polar molecule.
Your question is incomplete most probably your full question was
a. What is the electron-domain (charge-cloud) geometry of BrF5? Enter the electron-domain geometry of the molecule.
b. What is the molecular geometry of BrF5?
c. Ignoring lone-pair effects, what is the smallest bond angle in BrF5?
d. Which choice best describes the polarity of BrF5?
The molecule is polar and has polar bonds.
The molecule is nonpolar and has polar bonds.
The molecule is polar and has nonpolar bonds.
The molecule is nonpolar and has nonpolar bonds.
e. Of the molecules below, only ________ is polar.
H2
SiS2
CH4
AsH3
PF5
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he accident occurred during a safety test on the steam turbine of an RBMK-type nuclear reactor. During a planned decrease of reactor power in preparation for the test, the power output unexpectedly dropped to near-zero. The operators were unable to restore the power level specified by the test program, which put the reactor in an unstable condition. This risk was not made evident in the operating instructions, so the operators proceeded with the test. Upon test completion, the operators triggered a reactor shutdown. But a combination of operator negligence and critical design flaws had made the reactor primed to explode. Instead of shutting down, an uncontrolled nuclear chain reaction began
The operators were unable to restore the power level specified by the test program, which put the reactor in an unstable condition.
What is a project Reactor?Project Reactor is a fully non-blocking foundation with back-pressure support included. It's the foundation of the reactive stack in the Spring ecosystem and is featured in projects such as Spring WebFlux, Spring Data, and Spring Cloud Gateway.
What is basic reactor?Light-water reactors (LWRs) are power reactors that are cooled and moderated with ordinary water. There are two basic types: the pressurized-water reactor (PWR) and the boiling-water reactor (BWR). In the PWR, water at high pressure and temperature removes heat from the core and is transported to a steam generator.
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which phase transitions result in a decrease in the entropy of their surroundings? select all that apply. group of answer choices fusion sublimation vaporization freezing condensation deposition
Condensation reduces a system's entropy by changing a gas into a liquid state while also dissipating heat outside the system.
What affects the environment's entropy?Since heat (heat) is being released from the system into the environment, the entropy of a environment will rise.The subscript "systems" is frequently omitted from the heat in the previous iteration of this equation since heat is typically defined from the viewpoint of the system.
What modifications cause an increase in entropy?As the temperature rises, entropy increases.The kinetic energy of the substance's particles increases as temperature rises.
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the activation energy for a reaction is changed from 237 kj/mol to 57.9 kj/mol at 653 k by the introduction of a catalyst. of the uncatalyzed reaction takes about 2290 years to occur, about how long will the catalyzed reaction take? assume the frequency factor a is constant and assume the initial concentrations are the same.
The activation energy for a reaction is changed from 237 kj/mol to 57.9 Kj/mol at 653 k by the introduction of a catalyst. of the uncatalyzed reaction takes about 2290 years to occur then about 1.64 * 10³yr⁻¹ will be consumed by uncatalyzed reaction if we assume the frequency factor a is constant and assume the initial concentrations are the same.
Activation energy for uncatalyzed energy,
Eₐ(1) = 237kJ/mol
Activation energy for catalyzed reaction,
57.9 kJ/mol
Time taken by uncatalyzed reaction,
t₁=2290 years
Temperature, T=653 K
First, we will find the rate constant for the uncatalyzed reaction:
k ∝ 1/t
k₁ = 1/2290yr=0.00040 yr⁻¹
The rate constant the catalyzed reaction (k2) is calculated as follows:
[tex]ln\frac{K_{2} }{K_{1} }[/tex] = [tex]\frac{E_{a(1) -E_{a(2)} } }{RT_{} }[/tex]
R=8.314 J/K⋅mol
K₂ = -6.08 * 10⁻⁴ yr⁻¹
Now, we will find time taken by catalyzed reaction:
t₂ = 1/k₂
t₂ = 1.64 * 10³yr⁻¹
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What type of connecting force is permanent until the molecules go through a chemical reaction?
Answer: B intermolecular force
Explanation:
The answer to this question is Intermolecular force, since particles are connected to each other with a respective force prior to chemical reaction and this respective force is categorized on the basis of the nature of the particle all these forces are majorly considered an intermolecular force.
inter means between, molecular means molecules, resulting in binding force between molecules.
there are several different types of intermolecular forces :
Dispersion,
Dipole-Dipole,
Hydrogen Bonding
Ion-Dipole.
several types of intramolecular forces are:
Ionic bond( formed between ions)
Covalent bond (formed between carbon atoms)
metallic bond( formed between metallic atoms)
Answer: C. intarmolecular
Explanation:
balance the following sodium borohydride reduction equation below.
Therefore, C₁₄H₁₀O₂ + NaBH₄ = C₁₄H₁₄O₂ + Na₂ + B₄ is the balanced equation for sodium borohydride reduction.
Why is sodium borohydride used?Aldehydes, ketones, or acid chlorides can be reduced using sodium borohydride when other easily reducible functional groups are present. 32 The solvents employed for the reduction are indicative of sodium borohydride's comparatively low reactivity. converts ketones and aldehydes to the corresponding alcohols. Esters, epoxides, lactones, carboxylic acids, nitro compounds, and nitriles are not reactive to sodium borohydride; nonetheless, it decreases acyl chlorides.
What is sodium borohydride made of?In chemistry, sodium borohydride is a widely used reducing agent. Its formula is NaBH4, and its constituent elements are sodium (Na), boron (B), and hydrogen (H). Since it is a safer reagent for reduction than other options, it is frequently employed in chemistry labs. NaBH4 is primarily utilised in the production of Na2S2O4 (sodium dithionite), a bleaching agent for wood pulp that is also used to convert aldehydes and ketones to alcohols, from SO2.
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Imagine yourself in the shoes of Dimitri Mendeleev. You are provided with two sets of cards that list properties of various elements. These cards resemble the cards used by Mendeleev when he grouped elements. One set of cards lists the names of known elements and their properties, while the other set of cards lists the properties of a few unknown elements. These sets are shown below.
I would use the information from both sets of cards to create a comprehensive table of elements that organizes the elements according to their properties. This table would allow for easy prediction of the properties of new elements based on their position within the table.
Who invented the periodic table?As a theoretical chemist and inventor of the periodic table, I would approach this task by first organizing the known elements based on their properties, such as atomic weight, melting point, boiling point, and valence. I would then look for patterns and trends in the properties of the known elements and group them together accordingly.
Next, I would examine the properties of the unknown elements and compare them to the known elements. I would try to find a place for each unknown element within the table of known elements, based on its properties. If the properties of the unknown element did not match any of the known elements, I would consider the possibility of a new element that should be added to the table.
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What is the force that exists between two atoms within a single molecule?
Answer:Intermolecular forces
Explanation:See in a molecule these intermolecular forces hold the atoms together which decides the rigidity of the material.
I hope the answer was helpful
chemical elements that do not exist in nature but can be created in the laboratory are known as synthetic elements. moscovium (\ce{mc}mcm, c), a synthetic element with atomic number 115115115, was first synthesized in 200320032003. a hypothetical mass spectrum for a sample of \ce{mc}mcm, c containing 101010 atoms is shown below.using the information in the spectrum, calculate the average atomic mass of \ce{mc}mcm, c in the sample. write your answer using four significant figures.
Nihonium (Nh) mass is 285.7 u, a synthetic element with atomic number 113, was the first synthesized chemical elements that do not exist in nature but can be created in laboratory.
How are laboratory-produced synthetic elements made?Particle accelerators produce synthetic elements. Two tiny elements are propelled at breakneck velocities and crash with one another. Their nuclei combine to form one bigger element. Before it degrades, the element is examined using lab equipment.
Mass of Nb from the figure:
=> 10% x 284.2 + 30% 285.2 + 60% x 286.2
=> 285.7 u (atomic mass unit)
What purposes serve artificial elements?Transuranium elements and the actinoid series are typically found in period 7, along with occasionally created artificially. These elements can be utilised for detectors and spectrophotometers in addition to being the typical fuel for chemical reactors. Some are applied in the pharmaceutical sector.
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Chemical elements known as synthetic that do not exist in nature but = was elements_ Nihonium can be created in the laboratory are the first synthesized in 2004. (Nh), synthetic element with atomic number 113, hypothetical mass spectrum for sample of Nh containing 10 atoms shown in the picture. Using this spectrum information, calculate the mass of Nh in this sample
Answer:
285.7 u.
Explanation:
1 / 4
The equation for average atomic mass is
average atomic mass
=
∑
�
=
1
�
(
relative abundance
×
atomic mass
)
�
average atomic mass=
i=1
∑
n
(relative abundance×atomic mass)
i
start text, a, v, e, r, a, g, e, space, a, t, o, m, i, c, space, m, a, s, s, end text, equals, sum, start subscript, i, equals, 1, end subscript, start superscript, n, end superscript, left parenthesis, start text, r, e, l, a, t, i, v, e, space, a, b, u, n, d, a, n, c, e, end text, times, start text, a, t, o, m, i, c, space, m, a, s, s, end text, right parenthesis, start subscript, i, end subscript
We can use this equation, along with the relative abundances and atomic masses of each isotope in the mass spectrum, to calculate the average atomic mass of
N
h
Nh in the sample.
Hint #22 / 4
The mass spectrum shows three peaks, each corresponding to a different isotope of
N
h
Nh. We can determine the relative abundance of each isotope by dividing the number of atoms of that isotope present in the sample by the total number of atoms in the sample:
Isotope
N
h
-
284
Nh-284
N
h
-
285
Nh-285
N
h
-
286
Nh-286
Atomic mass (
u
u)
284.2
284.2284, point, 2
285.2
285.2285, point, 2
286.2
286.2286, point, 2
Relative abundance
1
a
t
o
m
10
a
t
o
m
s
=
.
1
10 atoms
1 atom
=.1
3
a
t
o
m
s
10
a
t
o
m
s
=
.
3
10 atoms
3 atoms
=.3
6
a
t
o
m
s
10
a
t
o
m
s
=
.
6
10 atoms
6 atoms
=.6
Hint #33 / 4
Plugging the relative abundances and atomic masses into the equation for average atomic mass, we get:
average atomic mass
=
∑
�
=
1
�
(
relative abundance
×
atomic mass
)
�
=
(
.
1
×
284.2
u
)
+
(
.
3
×
285.2
u
)
+
(
.
6
×
286.2
u
)
=
28.42
u
+
85.56
u
+
171.7
u
=
285.7
u
average atomic mass
=
i=1
∑
n
(relative abundance×atomic mass)
i
=(.1×284.2 u)+(.3×285.2 u)+(.6×286.2 u)
=28.42 u+85.56 u+171.7 u
=285.7 u
Hint #44 / 4
So, based on the mass spectrum, the average atomic mass of
N
h
Nh in the sample is
285.7
u
285.7 u.
at a certain temperature, the solubility of n2 gas in water at 2.04 atm is 48.0 mg of n2 gas/100 g water . calculate the solubility of n2 gas in water, at the same temperature, if the partial pressure of n2 gas over the solution is increased from 2.04 atm to 6.00 atm .
According to henry's law, The solubility of n2 gas in water, at the same temperature is, 141 mg/100 g water.
What qualities make up solubility?The maximum amount of a chemical which will dissolves in a volume of solvent at a given temperature is referred to as its solubility. Varying compounds have quite different solubilities, which is a characteristic of a specific solute-solvent pair.
Henry's Law says that the solubility of a gas is directly proportional to the pressure so:
S1/P1 = S2/P2
48 mg/100g / 2.04 atm = S2/6 atm
S2 = 141 mg/100 g water
solubility of n2 gas is 141 mg/100 g water
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calculate the ph of a 0.20 m solution of nh4br at 25.0 ∘c.
The pH of a 0.20 m solution of NH₄Br at 25.0 ∘c is 4.96.
pH is defined as the measure of the concentration of H⁺ ions, the acidity as well as alkalinity of a solution. Aqueous solutions at 25 ° C with a pH of less than 7 are basic and acidic or the alkaline solutions are those having pH greater than 7. All the acids and bases does not react with the same chemical compound at the same rate. Some will react vigorously, some moderately while others not show any reaction.
Use the Ka=5.6x10^-10
NH₄+(aq)+H₂0(l)=NH₃(aq)+H₃O+(aq)
I 0.20 0 0
C -x +x +x
E 0.20-x x x
(x^2)/(0.20-x)=5.6x10^-10
x=0.000011=[H₃O+]
pH=-log[H₃O+]
-log(0.000011)
pH=4.96
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Pansy has measured the volume of a sample of oxygen gas and has found that she has a total of 9.03 moles of the gas. What is the mass of this sample of oxygen gas? Please round your answer to two digits after the decimal point, and remember to include correct, complete units (including substance formula).
Answer:
Pansy has measured the volume of a sample of oxygen gas and has found that she has a total of 13.44 moles of the gas. What is the mass of this
Explanation:
n=m/Mr. m= nxMr = 13.44 x 32 = 430.08 g of oxygen
When is an object acceleration? Choose all that apply
Any
procedure
where the velocity varies is referred to as
object acceleration.
There are only two ways to accelerate
changing your
speed
or
changing your
direction
, or
changing both.
This is because
velocity
is both a speed and a direction.
No matter how quickly you're moving, you can't possibly be accelerating if you're not also altering your direction and speed.
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acceleration
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A small generic section of the primary structure of an a helix is given below. ?amino acid1 ?amino acid2 ?amino acid3 ?amino acid4 ?amino acid5 ?amino acid6 ?amino acid7? (a) Which amino acid residue?s backbone forms a hydrogen bond with the backbone of the sixth (6th) residue? Choose the correct residue from the drop-down menu. amino acid Select answer (b) Which of the following peptide segments is most likely to be part of a stable a helix at physiological pH? (c) How many hydrogen bonds can be formed within the backbone of 7 residues? Do not count the hydrogen bonds between this section and outside the section.
The an alpha helix amino fundamental structure Amino acid 1 two amino acids acid three −Glu−Leu−Ala−Lys−Phe− is the answer and three hydrogen bonds with water.
What are amino acids from helix?On a polypeptide chain, a -helix is a correct helix of amino-acid residues that normally has between 4 & 40 residues. The oxygen of the top coil (C=O) and the protons of the bottom coil (N-H) form hydrogen bonds that keep this coil together.
What makes proline the "helix breaker"?Alpha-helical and beta-sheet architectures of soluble (globular) proteins are known to be easily broken by the amino acid proline. This creates a structural conundrum because the Pro residue is frequently found in the presumed transmembrane helices of membrane proteins, deliver excellent proteins.
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For a fixed amount of gas at a fixed temperature, what will happen if the volume is doubled? Will the pressure be doubled, remain unchanged, quadruple, or be halve?
For a fixed amount of gas at a fixed temperature, if the volume is doubled, the pressure will be doubled.
It is because according to the Ideal Gas Law, pressure and volume are directly proportional to each other. As one goes up, the other one goes up by the same degree. Formula for Ideal Gas Law is PV = nRT.
What is the Ideal Gas Law?The Ideal Gas Law is the law in which the product of the pressure and the volume of one gram molecule of an ideal gas is equivalent to the product of the absolute temperature of the gas and the universal gas constant.
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