Answers
Related Questions
If the bond length in a XY molecule is 212,
what will be the covalent radius of atom X, if
the covalent radius of Y atom is 93.
O
119
2.27
128
3
Answers
Answer:
The correct answer is 119.
Explanation:
We are given the bond length of XY is 212.
The covalent radius of Y = 93.
Now this means that the bond length(R) is sum of the radio of X and Y Atom.
So, R(XY)=r(X)+r(Y)
212 = r(X)+93
r(X)= 119.
Therefore, the covalent radius of X is 119.
I hope this helps, have a good day! :D
Bond length is the distance between two bonded atoms. The covalent radius of X in XY molecule with bond length 212 and Y with a covalent radius of 93, is 119.
What is covalent radius?Covalent radius is the measure of the atomic size bonded with another atom through covalent bond. Covalent bonds are formed between non-metals with comparable electronegativities.
Bond length of molecule is the distance between the two bonded atom. Mathematically bond length of a covalent compound is the sum of covalent radius of the two bonded atoms.
The bond length of the molecule XY is given as 212 and the covalent radius of Y atom is 93. The bond length 212 is the sum of covalent radius of Y and covalent radius of X.
Covalent radius of X = 212 - 93 = 119.
Therefore, covalent radius of X atom in the XY molecule with bond length 212 and Y atom with covalent radius of 93 is 119 thus, option a is correct.
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Write a balanced redox reaction between acidified potassium permanganate and iron two chloride and predict if the reaction is spontaneous Emno.4/Mn^2+=1.74v fe^2+|fe^3+=0.75
Answers
The balanced redox reaction between acidified potassium and iron two chloride is given as ,
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] ++ 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous
Place these numbers as coefficients in front of the formulas containing those atoms.
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance all remaining atoms other than H and O
[tex]Fe^{+2}[/tex] + [tex]MnO_{4} ^{- }[/tex] → [tex]Fe^{+3}[/tex] + [tex]Mn^{+2 }[/tex]
Balance O.
Add enough H2O molecules to the deficient side to balance O.
We have 4O atoms on the left, so we need 4H2O
on the right.
5[tex]Fe^{+2}[/tex] + 1 [tex]MnO_{4} ^{- }[/tex] + 8 [tex]H^{+}[/tex]→ 5[tex]Fe^{+3}[/tex] + 1 [tex]Mn^{+2 }[/tex] + 4[tex]H_{2} O[/tex]
The reaction is spontaneous when the value of E ° for the reaction is positive .
E ° for [tex]MnO_{4} ^{- }[/tex]/ [tex]Mn^{+2 }[/tex] = 1.74 V
E ° = [tex]Fe^{+3}[/tex]/ [tex]Fe^{+2}[/tex] = 0.75 V
E ° for reaction = 1.74 V - 0.75 V = 0.99 V
Hence , E ° for reaction is positive .
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A weak acid has a molar mass of 162 g mol-1. Analysis of a 0.8821 g sample showed the composition by mass is 0.0220 g H, 0.3374 g P, and the remainder to be O. Determine its empirical and molecular formula.
Empirical
Molecular
Answers
1. The empirical formula of the weak acid is H₂PO₃
2. The molecular formula of the weak acid is H₄P₂O₆
Data obtained from the question Mass of compound = 0.8821 gH = 0.0220 gP = 0.3374 gO = 0.8821 - (0.0220 + 0.3374) = 0.5227 gEmpirical formula =? Empirical formula =? Molecular formula =?1. How to determine the empirical formulaThe empirical formula of the compound can be obtained as follow:
Divide by their molar mass
H = 0.0220 / 1 = 0.022
P = 0.3374 / 31 = 0.01
O = 0.5227 / 16 = 0.03
Divide by the smallest
H = 0.022 / 0.01 = 2
P = 0.01 / 0.01 = 1
O = 0.03 / 0.01 = 3
Thus, the empirical formula of the compound is H₂PO₃
2. How to determine the molecular formula Empirical formula = H₂PO₃Molar mass of compound = 162 g/molMolecular formula =?Molecular formula = empirical × n = mass number
[H₂PO₃]n = 162
[(1×2) + 31 + (16×3)]n = 162
81n = 162
n = 162 / 81
n = 2
Molecular formula = [H₂PO₃]n
Molecular formula = [H₂PO₃]₂
Molecular formula = H₄P₂O₆
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A stone with a mass of 10 kg sits on the ground. Gravity acts on the stone at a rate of 9.8 m/s2. What is the normal force
acting on the stone, keeping it at rest? (1 point)
O 1.02 N
O 9.8 N
O 10 N
O98 N
Answers
Answer:
Fn = m x g
Fn = normal force
m = mass of the stone
g = gravitational force acting on the stone.
therefore, fn=m x g = 10kg x 9.8m/s2 = 98 kgm/s2 or 98 N. Which is the same as 098 N.
Explanation:
A stone with a mass of 10 kg sits on the ground. The normal force acting on the stone, keeping it at rest, is 98 N. The correct option is D.
What is force?A force is a power that changes the position of an object. This results in the action or movement of any object. Force is calculated in Newton. The force can be calculated by multiplying the mass by acceleration.
Given, the mass of the stone is 10 kg
The gravitational force act at the rate of 9.8 m/s²
The formula is
Force = mass x gravitational rate
Fn = normal force
m = mass of the stone
g = gravitational force acting on the stone
So, fn = m x g
10kg x 9.8 m/s²
98 kg m/s²or 98 N
Therefore, the normal force acting on the stone, keeping it at rest, is 98 N. The correct option is D.
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Tell how many protons, neutrons, and electrons 39_K 1_H contains ?
Answers
19 protons, 20 neutrons and 18 electrons.
Every atom has a proton, a subatomic particle, in its nucleus. The particle is electrically charged positively.Except for basic hydrogen, every atom's nucleus contains a neutron, a subatomic particle.A negatively charged subatomic particle known as an electron can either be free or attached to an atom.The protons are determined by the atomic number (19).
therefore, number of proton = 19
The protons and neutrons together make up the atomic mass.
P + N = 39
19 + N = 39
number of neutrons = 39 - 19 = 20
A neutral atom has an equal number of protons and electrons. The negative charge is the same as the positive charge. The number of electrons represents the negative charge. The charge of this ion is +1. Therefore, find the negative charge.
= -19 + 1 = -18
therefore, number of electrons are 18.
Thus, no. of proton = 19
no. of neutrons = 20
no. of electrons = 18
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As wind blows up the windward side, sand grains may be picked up and blown toward the top. Then grains may drop, allowing them to slip down the leeward side. What event is this describing?
1: Desertfication
2: Deposition
3: Dune movement
4: Drought of farmlands
Answers
The event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
What is Dune movement?
The sand mass of dunes can move either windward or leeward, depending on if the wind is making contact with the dune from below or above its apogee.
If wind hits from above, the sand particles move leeward; the leeward flux of sand is greater than the windward flux.
Thus, the event described when wind blows up the windward side, sand grains may be picked up and blown toward the top is Dune movement.
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The lab procedure says, "weigh 1.0 g of sodium chloride." Which of the following are acceptable masses?
Answers
The lab procedure
The 150 mL beaker's contents should be emptied into the sink, followed by a thorough water rinse of the beaker and temperature probe sodium . Add 20 g of ice to the beaker after weighing it.
sufficient water to make the combined weight match the combined weight of the ice and water consumed above. Put the thermometer in the slush, press the green button, and agitate the mixture.
For two minutes, slush. sodium Stir the slush while adding the 1.0 g of salt chloride. five minutes Simply press the red button. After saving the data, select Store Latest Run from the list.
The menu for experiments print the graph with both the sodium chloride and urea plots visible at once. sodium Which plot corresponds to which solid should be noted on the printout.
The 150 mL beaker's contents should be emptied into the sink, followed by a thorough water rinse of the beaker and temperature sodium .
Simply select Show Data Set from the Data menu, followed by the Run # you want to display, to examine one of your earlier plots. It is possible to display multiple pieces of data at once.
The Latest Run is the most recent Run, and the Runs are numbered consecutively in the order in which they were acquired. To display the chosen plot or plots, just use the commands Hide Data Set and Show Data Set. The plot display settings (such as axes scaling, etc.) may need to be changed.
Display one or both students' temperature charts using the y-axis label, as desired. The Data menu also includes options for deleting individual data sets.
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Questions
Q1.
Use the Periodic Table on page 2 to help you answer this question.
Give the name or symbol of
(a) the element in group 3 and period 4.
Answers
Gallium is the element that belongs to the group 3 and the fourth period. Ga is symbol of Gallium.
The element gallium has an atomic number of 31.While highly pure gallium is covered in a dazzling silvery colour, solid gallium is a blue-grey metal with an orthorhombic crystalline structure.It is a crucial part of numerous semiconductors. Due to its capacity to transform power into light, it is additionally used in red LEDs (light emitting diodes).Because of its high boiling point, it is perfect for recording temperatures that would cause a thermometer to vaporise.From iron pyrites, zinc blende, germanite, and bauxite, this metal can be readily removed as a byproduct.Because gallium is a corrosive chemical, it can cause serious skin and eye burns asse well as significant irritation.Learn more about semiconductors here
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This is an impossible formula. Pretend it is real.
If you had 1 mol of Mn9(ClO4)2 how many moles of O would there be?
Remember that you should never include a 1 as a subscript but for the sake of clarity for this problem you may see a 1 as a subscript.
Make sure your answer includes TWO decimal places.
Answers
There are eight moles of oxygen atoms in 1 mole of [tex]Mn_{9}(ClO_{4}) _{2}[/tex].
What is the number of moles of oxygen atoms?We know that a compound is composed of atoms. The atoms that make up the molecule are chemically combined. It is usual that the number of atoms in the compound would correspond with the chemical formula.
Now we have the compound [tex]Mn_{9}(ClO_{4}) _{2}[/tex]. In one mole of the compound we have;
9 Moles of manganese atom2 moles of chlorine atom8 moles of oxygen atomThus, there are eight moles of oxygen atoms in 1 mole of [tex]Mn_{9}(ClO_{4}) _{2}[/tex].
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Question 8 of 8
Which statement best describes what happens when thermal energy of the
air around a fire is transferred to the surrounding air?
A. The thermal energy is destroyed as it changes to chemical energy.
OB. The thermal energy is destroyed over time.
C. The thermal energy is spread out by the surrounding air.
D. The thermal energy changes to chemical energy.
Answers
Answer:
Explanation:
A) The thermal energy is spread out by the surrounding air would be the right answer
hope you get it right :)
How many moles of calcium do you have if you measure out 19.13 g of calcium?
Enter your answer in decimal form with the correct number of sig figs. Use the proper abbreviation for the units.
Answers
Using the two amino acids alanine and glycine, show a dehydration synthesis reaction forming a dipeptide. Draw the dipeptide of two amino acids joined together by a peptide bond. Label the peptide bond with an arrow. The position of the peptide bond is also the place in the molecule where a water molecule was removed and the two amino acids were joined by a dehydration synthesis reaction (also sometimes referred to as a condensation reaction).
Answers
A protein is composed of a combination of amino acids.
What is a peptide bond?A protein is composed of a combination of amino acids. The amino acids join together in a peptide bond. A number of peptide bonds give polypeptides which are the building blocks for proteins.
Now, we can see from the image that the polypeptide bond occurs between the carboxylic group of the glycine and the amine group of the alanine.
This leads to a loss of water molecule and a subsequent formation of the amide bond by condensation.
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which statement concerning the oxygen level in the lake can be inferred from the graphs. 1) the increase of the sewage waste from 1950 to 1970 was due to decreasing human population. 2) the decreasing and sewage Way shows the environmental problems associated with the lamb population have been solved. 3) sewage waste is a good source of nutrients for most of fish.4) increases in sewage ways were responsible for decreasing oxygen levels in the lake
Answers
Increases in sewage waste were responsible for decreasing oxygen levels in the lake
Humans does have the impact on the environment in several ways. Common effects includes lowered water quality, elevated pollution and greenhouse gas emissions, depletion of natural resources and contribution to global climate change.
As global temperatures increasing , weather patterns on earth will dangererously change. While some areas will have longer growing seasons, others will become drought wastelands as water will decrease in vast areas, turning once floral regions into deserts. The elevation will impact weather patterns, provoking more intense hurricanes in both size and frequency, as well as intensifying and prolonging droughts and heat waves. But air pollution not only just effect the environment . The evidence is increasing that poor air quality and rising temperatures are ruining delicate ecosystems, even led to increased asthma and cancer rates in humans.
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Rather than saying the electrons transition
between energy levels to produce the colors in fireworks, how might
mechanical model? What does this tell you about the energies of the
you refine this description using your new knowledge of the quantum
orbitals?
Answers
When the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.
What is electron transition?Electron transition can be defined as when an atoms or molecules absorbs radiation there electron get excited and jump from lower energy level to higher energy level and when an atom or molecule emit radiations energy it come back to its original place i.e. to the lower energy state.
Electron transition is based on Franck-Codon principle.
According to this principle electron transition occur without changes in position of there nuclei in the molecular entity and its environment.
Thus, when the electrons get excited it move from lower level to higher energy level and gain energy but when electrons pumped back to there lower energy level the excess energy get emitted as light.
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What type of scientist uses mathematics to propose untested ideas
Answers
Answer: theoretical scientist
Explanation:
Define global warming potential
Answers
Answer:
Global warming potential (GWP) is the heat absorbed by any greenhouse gas in the atmosphere, as a multiple of the heat that would be absorbed by the same mass of carbon dioxide (CO 2).
What is the overall chargeon particles with the subatomic makeups given if there are3 protons, 3 neutrons, and 2 electrons?
Answers
Answer:
+1
Explanation:
The neutrons do not affect the overall charge of the particle. Protons have a positive charge and electrons have a negative charge. Since the protons outnumber the electrons by one, there is an overall charge of +1.
Here is a more in depth explanation: if there are 3 protons, each which have a value of +1, the protons contribute a +3 charge. If there are 2 electrons, each which have a value of -1, the electrons contribute a -2 charge. When you add these two charges, you are left with an overall charge of +1 (+3 + (-2) = +1).
1. Use the following information to answer 3 questions. When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:
2KClO3(s) → 2KCl(s)+ 3O2(g)
If 12.25g potassium chlorate decomposes, how many grams of oxygen will be release?
(A) 1.60 g (B) 3.20 g
(C) 4.80 g (D) 18.37 g
Answers
4.80 grams of oxygen will be release.
When heated in a closed container in the presence of a catalyst, potassium chlorate decomposes into potassium chloride and oxygen gas via the following reaction:
2KClO3(s) → 2KCl(s)+ 3O2(g)
mass of potassium chlorate = 12.25g
mole of KClO3 = 12.25/122.5 = 0.1 mol
2 mole KClO3 (consumed) = 3 mole O2 (produced)
1 mole KClO3 = 3/2 mole O2
0.1 mole KClO3 = 0.1*1.5 mole O2
= 0.15 mole O2
mass of O2 = 0.15 * 32 = 4.80 grams
4.80 grams of oxygen will be release.
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the kind of light coming from a substance
Answers
When a large object fell into a full swimming pool, it displaced 33.8 gallons of water. The density of the object is 1.65 g/mL. What is the object's weight in pounds?
Answers
If the density of the object is 1.65 g/mL. The object's weight in pounds m = 483.32 pounds.
what is density ?The density can be defined as the mass per unit volume which can be described it is the ratio between mass and volume.
Density is a measurement of matter, where it determine how tightly the matter is bond together, discovered by the Greek scientist Archimedes.
To calculate the density of an object, Density = Mass/Volume
The density of the object is 1.65 g/mL, Volume of the water is 35.1 gallons
1 gallon = 3785.41 mL
35.1 gallons = 132868 mL
1 pound = 453.592 grams
So, 219232.2 grams = 483.32 pounds weight.
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The density of air is 1.29 grams/Litre. What is the weight, in kilograms of a cubic metre (1.00 m^3) of air?
Answers
The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg
How can you calculate the density of humid air?Humid air's density can be calculated by treating it as a mixture of ideal gases. The vapour pressure is the partial pressure of water vapour in this case. In the temperature range of 10 °C to 50 °C, the density calculation error is less than 0.2% using this method.
given that
Density =mass/ volume
1.29grams/ liter =[tex]\frac{mass}{m^{3} }[/tex]
1 liter = 0.001 [tex]m^{3}[/tex] and 1 kilogram = 0.001grams
0.00129 kg/[tex]m^{3}[/tex] = mass / 0.001 [tex]m^{3}[/tex]
mass =0.00129 kg/[tex]m^{3}[/tex] /0.001 [tex]m^{3}[/tex]
which means,
mass= 1.29 kg
The density of air is 1.29 grams/Litre. The weight, in kilograms of a cubic meter (1.00 m^3) of air is 1.29 kg
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how light behaves as it relates to its nature (waves or particles).
Light travels as
and interacts with matter as
Answers
Light travels as a "wave" and interacts with matter as a "particle".
Electromagnetic radiation that the human eye can detect as light. From radio waves with wavelengths measured in metres to gamma rays with wavelengths shorter than roughly 1 1011 metres, electromagnetic radiation occurs throughout a very broad range of wavelengths. The wavelengths of light that are visible to humans fall into a very small range within that wide spectrum, ranging from about 700 nanometers (nm; billionths of a metre) for the red light to roughly 400 nm for violet light.
Infrared and ultraviolet are two spectral bands that are close to the visible band and are frequently referred to as light as well. A fundamental physics constant, the speed of light in a vacuum is currently accepted to be 299,792,458 metres per second.
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Solve the following problem:
How many seconds are in 3 years?
Please show your work. You will need to include the following conversion factors:
• 365 days/1 yr or 1 yr/365 days
1 day/24 hours or 24 hours/1 day
.60 min/1 hour or 1 hour/60 min
. 1 min/60 sec or 60 sec/1 min
Answers
Answer: 94,608,000 seconds
Explanation:
365 days/1 yr=365
24 hours/1 day=24
60 min/1 hour=60
60 sec/1 min=60
365*24*60*60=
8760*3600=31536000 seconds in 1 year.
31536000*3=94608000 seconds
It cost $35.57 to drive the school bus for 94.00 miles.
Given:
Distance to drive (D) = 94.00 miles
Miles per gallon (MPG) = 6.500 miles/gallon
Cost of gas (C) = $2.459/gallon
Step 1: Calculate the amount of gas required for the trip.
Gas consumed = Distance / Miles per gallon
= 94.00 miles / 6.500 miles/gallon
= 14.4615 gallons
Step 2: Calculate the cost of gas for the trip.
Cost of gas = Gas consumed * Cost per gallon
= 14.4615 gallons * $2.459/gallon
= $35.57
Therefore, it will cost $35.57.
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235 miles converted to kilometers
Answers
Answer:
378.196
Explanation:
Multiply the length value by 1.609.
235 miles = 378.196 kilometers
Answer:
378.196 Kilometers
Explanation:
For an approximate result, multiply the length value by 1.609.
235*1.609 = about 378.2
Rene grew bacteria from mouth on special plates in the lab she placed drops of different mouthwashs on bacteria on each plate
Answers
The correct answer is Test the hypothesis with an experiment.
Rene grew bacteria from mouth on special plates and now she is conducting a research on those bacterias by dropping different mouthwash on them to find out effect of mouthwashes on bacteria. This comes under the category of test the hypothesis with an experiment. When performing experiments and investigating observations, the scientific method is a technique that is used.This method's objective is to identify the connections between cause and effect in diverse contexts and applications.There are total seven steps of scientific method:Ask the questionPerform research Establish your hypothesisTest your hypothesis by conducting experimentMake an observation Analyse the result and draw the conclusionPresent the findingsThe key goal of 4th step is to gather information and facts to test our idea.
Therefore, Rene is on the 4th step of scientific method.
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Can you please help me
Answers
Answer: true
Explanation:
10) A graduated cylinder has a mass of 50 g when empty. When 30 mL of water is added, the graduated
cylinder has a mass of 120 g. If a rock is added to the graduated cylinder, the water level rises to 75
mL and the total mass is now 250 g. What is the density of the rock?
M=
V=
D=
Answers
The rock would weigh 2.89 grams per milliliter.
It is the mass of anything or body per unit volume of that specific object or body.
Equals volume / mass
A graduated cylinder has a mass of 50g when empty, as stated in the problem. The graduated cylinder has a mass of 120g after 30 mL of water have been added.
The rock weighs 250 grams, or 130 grams.
the rock's volume is equal to 75 milliliters minus 30 milliliters, or 45 milliliters.
Mass of the rock divided by volume equals 2.89 grams per milliliter, which is the density of the rock.
As a result, the rock has a density of 2.89 grams per milliliter.
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Describe how you prepare 2.00L of each of the following solutions. 0.250 M NaOH from Solid NaOH
Answers
To prepare 2.00 L of 0.250 M NaOH from solid NaOH, dissolve 20 g of NaOH in 2.00 L of water to form 0.250 M NaOH solution.
A stock solution is a solution with high concentration of any particular solute and it is used for obtaining moderate quantities of solute using small volumes.
Sodium hydroxide is a strong electrolyte with the molecular formula NaOH. Sodium hydroxide completely dissociates in aqueous solution to produce Na⁺ and OH⁻ ions. Hence, sodium hydroxide is considered to be a strong base. Sodium hydroxide, also called caustic soda, is highly hygroscopic in nature.
Firstly, we will prepare a stock solution, by placing n grams of NaOH in a liter volumetric flask. Then add 100 mL dilute water and make up the volume of solution to 1 liter.
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A rectangular piece of copper, 2.13 cm by 0.79 cm by 1.14 cm, weighs 17.11g. What is the density of the copper?
Answers
Density of copper is 8.92 g/cm3.
The mass of a substance per unit of volume is its density. Density is most frequently represented by the symbol(p), although Latin letter D may also be used.
Given:
weight of copper = 12.11 g
Volume = 2.13 cm * 0.79 cm * 1.14 cm
= 1.918 cm3
As we know that ,
Density = mass / volume
d = m/v
d = 17.11 / 1.918
density = 8.92 g/cm3
Density of copper is 8.92 g/cm3.
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C4H8(g)⟶2C2H4(g)
has an activation energy of 262 kJ/mol.
At 600.0 K, the rate constant, , is 6.1×10−8 s−1. What is the value of the rate constant at 820.0 K?
Answers
The value of the rate constant at 820.0 K is 0.2 s^-1
Applying the Arrhenius equation, which is...
k = Ae-Ea/RT
Applying the formula, we get
lnk2 = lnk1 - (Ea/R)(1/T2 - 1/T1)
Applying the values, we get
ln k2 = ln 6.1x10^-8 - (2.62x10^3/8.314)(1/820 - 1/600)
Calculating the value, we get...
ln k2 = -0.31
Taking power e, we get
k2 = 0.2 s^-1
Arrhenius equation relates the temperature and activation energy of a reaction.It is helpful in studying the different parameters related to reaction.Activation energy is the minimum required to attain to form the product.To learn more about the activation energy visit:
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