Determine the volume of a 0.100 M KMnO4 solution required to completely react with 2.05 g of Zn.
Express your answer using three significant figures.
The volume of a 0.100 M KMnO4 solution required to completely react with 2.05 g of Zn.193 ml.
Molar attention is a degree of awareness of a chemical species, specifically of a solute in a solution, in phrases of amount of substance consistent with the unit extent of solution. In chemistry, the maximum typically used unit for molarity is the variety of moles according to liter, having the unit symbol mol/L or mol/dm³ in SI unit.
Molarity is the range of moles of solute in line with the liter of answer. for instance, in case you dissolve table salt in water, salt is the solute, and water is the solution. One mole of sodium chloride weighs fifty-eight.44 grams. if you dissolve 58.44 grams of NaCl in one liter of water, you have got a one-molar solution, abbreviated as 1M.
Molarity of KMnO₄ = number of moles/vol of solution in L
0.100 M = 0.01928 / volume
volume = 0.1928 L = 192.8 ml
= 193 ml ( 3 significant figures)
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What is determined by the distance at which the lowest potential energy is achieved and the distance at which positive charges have the least repulsion?.
The positive charges in the two nuclei start to repel one another as the atoms get closer to one another, which raises the potential energy. The distance at which the lowest potential energy is attained determines the bond length.
How is bond length influenced by location?The internuclear distance at which the potential energy minimum occurs dictates the bond length. The equilibrium bond length is a more appropriate term since it reflects the distance at which the two atoms bounce as a result of thermal motion. In general, stronger bonds are formed when bonds are shorter.
Does the potential energy of bonds increase?When atoms are bound to other atoms, the majority of them achieve a lower potential energy. At this distance, the system's potential energy is supposedly equal to zero.
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Question
The melting points of canola oil, corn oil, sunflower oil, and peanut oil are 10°C, -11°C, -17°C, and -2°C respectively.
You cool a mixture of these oils to 5°C.
Which oil can be separated easily?
Responses
peanut oil
sunflower oil
canola oil
corn oil
The oil that can be separated at this temperature is canola oil.
What is the melting point?The term melting point has to do with the temperature in which a solid can be converted to liquid. This is the temperature at which the various bonds that holds the molecules of the substance can be broken off.
We are told in the question that; the melting points of canola oil, corn oil, sunflower oil, and peanut oil are 10°C, -11°C, -17°C, and -2°C respectively. We want to know the oil that can be separated easily at 5°C.
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which will dissolve faster in a cup of hot tea? a. tablespoon of sugar b. cube of sugar c.2 cubes of sugar
Tablespoon of sugar will dissolve faster in a cup of hot tea
Generally, a solute dissolves faster in a warmer solvent than it does in a cooler solvent because particles have more energy of movement. For example, if you add the same amount of sugar to a cup of hot tea and a cup of iced tea, the sugar will dissolve faster in the hot tea.
In the above case we can say that a tablespoon of sugar will dissolve faster in a cup of hot tea because when we compared table spoon of sugar with cube of sugar the surface area in grounded sugar is more and for cube of sugar the surface area is less and hence will take more time to dissolve.
So we can conclude that tablespoon of sugar will dissolve faster in a hot cup of tea.
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How does heat move? (6.P.3.1)
Group of answer choices
Heat always moves from the warmer substance to the cooler substance.
Heat always moves from the cooler substance to the warmer substance.
Heat always moves from the larger substance to the smaller substance.
Heat always moves from the smaller substance to the bigger substance.
The Heat move : Heat always moves from the warmer substance to the cooler substance.
The heat always moves from hotter to cooler object. when object are of different temperature comes in contact with the heat will transfer. heat always moves from cooler to hotter. this process is called as conduction. if you will touch something that is hot you will feel the heat. The heat moves in ways : conduction , convention and radiation. These are the three ways of heat transfer from one object to another object.
Thus, The Heat move : Heat always moves from the warmer substance to the cooler substance.
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A two blocks of copper at different temperatures are placed into contact with each other. The first block is 32.5 g and starts at a temperature of 68.7 oC. The second block is 43.7 g and starts at a temperature of 35.3oC. If the specific heat capacity of copper is 0.385 J/(g oC), what will the final temperature be?
Here the heat is transferred from the hot body to the colder body thus using the calorimetric equation for each copper block, the final temperature of the system is obtained as 61.6 °C.
What is calorimetry?Calorimetry is an analytical tool used to determine the heat energy absorbed or released by the system. The expression relating the heat energy q, mass m and the specific heat capacity c and temperature difference ΔT is written as follows.
q = mc ΔT.
It is given the heat capacity of copper is 0.385 J/°C g. The final temperature for both blocks will be equal and let it be x°C. Now the heat energy of the two blocks are equated as follows:
32.5 g × 0.385 (68.7 - x°C ) = 43.7 g × 0.385 ( x - 35.3°C )
2232.7 - 32.5 x = 43.7 x - 1542
690.7 = 11.2 x
x = 61.66 °C .
Hence, the final temperature of the system is 61.66 °C.
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If you bake a casserole in the oven and the casserole and dish absorb 250,000 J of heat,
q casserole = 250000 J,
what is q oven?
Answer: q= 2500
Explanation: just divide the numbers
The food for the plant, the sugar glucose, is written how chemically:
The food for the plant , the sugar glucose is written chemically as : C₆H₁₂O₆.
The glucose is a simple sugar. the glucose contains six carbon atoms and one aldehyde group. Glucose exist in two form the open chain and the ring structure. The glucose is used by the plants for energy. glucose provide energy to living things. glucose helps plant to live and grow. plants use the process of photosynthesis to convert the water , sunlight and carbon dioxide into oxygen and sugar called glucose. written as : C₆H₁₂O₆.
Thus, The food for the plant , the sugar glucose is written chemically as : C₆H₁₂O₆.
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How many g of NaCl (M, = 58.44 g/mol) are needed to make 3500 ml of a 5 M
solution?
1022.7 g of NaCl are needed to make 3500 ml of 5M solution
What is molarity?
It is defined as the total number of moles of solute per litre of solution.
M = n / V
where
M = molarity ( 5M )
n = no of moles
V = volume ( in litres)
For volume in mL
M = n * 1000 / V
As we know, n = w / M.M
where
n = no of moles
w = given mass ?
M.M = molar mass (58.44)
Substituting all the formulas:
M = n / V
= (w / M.M ) * (1000/ V in mL)
w = (M * M.M * V ) / 1000
= ( 5 * 58.44 * 3500 )/ 1000
= 1022.7 g
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. Determine the mass percent of sulphur (S) in penicillin (CH₂N₂SO₂) (C = 12, H = 1, N = 14, S = 32,0 = 16).
The mass percent of sulfur in the sample (CH₂N₂SO₂) is 30.2 %.
The mass percentage is used to explicitly the concentration of a solution while the mass of a solute and the mass of an answer are given:
Calculation:-
given mass of the sample (CH₂N₂SO₂) is = 106 g
mass of sulfur = 32 g
Mass percentage=Mass of Sulphur / Mass of the compound.
= 32g / 106 g × 100
= 30.2 %
Mass percent composition is calculated by evaluating the molar mass of detail in a compound to the overall molar mass of the entire compound. The very last calculation yields a percentage this is beneficial while evaluating numerous compounds with one another.
This component enables the showing of the lowest whole range of moles and the relative quantity of atoms of every element in a compound. With the assistance of the empirical system, chemists can also calculate the actual molecular formula. This formulation indicates the exact range of atoms inside the compound.
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in the following chemical reaction, which element is the oxidizing agent? 3 sn(no₃)₂(aq) 2 fe(s) → 2 fe(no₃)₃(aq) 3 sn(s)
The oxidizing agent here is the [tex]Sn^{2+}[/tex]
How do we know the oxidizing agent?We know that in a chemically reaction, there is the specie that looses electrons in the reaction and there is the specie that gains electrons in the reaction. The specie that looses electrons is the reducing agent while the specie that gains electrons is the oxidizing agent.
Now we can see that the specie that gains electrons and now has a decrease in the oxidation of the specie is the tin atom thus that is the oxidizing agent.
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Two electrons in the 1s orbital must have different spin quantum numbers to satisfy.
The electron pair in the 1s orbital satisfies the exclusion principle because they have opposite spins, or spin quantum numbers that are +1/2 and -1/2, which are different from each other. Compared to electrons in the 1s orbital, those in the 2s level have a different quantum number.
How does the Pauli exclusion principle work?According to Pauli's Exclusion Principle, no two electrons in the same atom can have values for all four of their quantum numbers that are exactly the same, put alternatively. There can never be more than two electrons in a single orbital, and they must also have opposing spins.
What is the Pauli exclusion principle, exactly, and how does it work?According to the Pauli exclusion, no two electrons can have the exact same set of quantum numbers.
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True or False: The Kinetic Molecular Theory states that particles move in random, straight line paths.
What is the name of this molecule?
Based on the IUPAC nomenclature of organic compounds, the name of the molecule is 5-ethyl-3-octenal.
What is the IUPAC nomenclature of compounds?The IUPAC nomenclature is the naming convention adopted by the International Union of Pure and Applied Chemistry.
In the naming of organic compounds, the name is divided into three parts;
the root name which is the name of the longest straight-chain hydrocarbonthe suffix which is the name of the principal substituent groupthe prefix which is the name of other substituent groups present in the organic compoundLearn more about IUPAC nomenclature at: https://brainly.com/question/17194396
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will 150 ml of 70 degree celsius water or 150 ml 30 degree celsius water cool down faster
A 0.470 g sample of a metal, M, reacts completely with sulfuric acid according to M(s)+H2SO4(aq)⟶MSO4(aq)+H2(g) A volume of 217 mL of hydrogen is collected over water; the water level in the collecting vessel is the same as the outside level. Atmospheric pressure is 756.0 Torr, and the temperature is 25 °C. The vapor pressure of water at 25 °C is 23.8 Torr. Calculate the molar mass of the metal.
The molar mass when rected with sulphuric acid to liberate 249 mL of hydrogen gas is 48 g/mol
The volume (V) = 249 mL = 249 / 1000 = 0.249 L
Pressure (P) = 1.0079 – 0.03167 = 0.97623 bar
The temperature (T) = 25.0 °C = 25 + 273 = 298 K
Gas constant (R) = 8.314×10¯² bar.L/Kmol
Number of mole (n) =?
n = PV / RT
n = (0.97623 × 0.249) / (8.314×10¯² × 298)
n = 0.0098 mole
How to determine the mole of the metal
Balanced equation
M(s) + H₂SO₄(aq) —> MSO₄(aq) + H₂(g)
From the balanced equation above,
1 mole of M reacts to produce 1 mole of H₂.
Therefore,
Mole of metal = 0.0098 mole
Mass of metal = 0.539 g
Molar mass is given as mass upon mole
Molar mass of metal = 0.470 / 0.0098
Molar mass of metal = 48 g/mol
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A scientist mixes water (containing no salt) with a solution that contains 45% salt. She wants to obtain 225 ounces of a mixture that is 30% salt. How many ounces of water and how many ounces of the 45% salt solution should she use?
The ounces of water needed for 45% of the salt solution is 75 ounces.
What is solution?
The homogeneous mixture of solid, liquid or gases with a solvent is called as a solution. All the components in the solution appear as a single phase which is homogeneous.
The solution of salt and water contains 45% salt. The ounces of water for 45% of the salt solution can be calculated as,
If V is the volume of water added in ounces then 225 - V is the volume of 45% salt solution needed,
0.45 x (225 - V) = 0.3 x 225
101.25 - 0.45V = 67.5
V = 75
Therefore, 75 ounces of water should be added to the solution.
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True or False: Coagulation uses an additive to make contaminants stick together.
True
False
According to the research, the correct answer is True. The statement ''Coagulation uses an additive to make contaminants stick together'' is true.
What is Coagulation?It is a chemical process of destabilization of the repulsive forces between colloidal particles, forming a gelatinous mass that traps (or binds) particles.
In this sense, to achieve that the repulsive forces disappear and that resistant and large flocs are formed, reagents and additives such as alumina, aluminous salts are used.
Therefore, we can conclude that according to the research, coagulation destabilizes the charges of the particles using additives so that the small suspended particles are able to stick to each other.
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↳
An unknown compound has a density in the gas phase of 1.14 g/L at 125 °C and 175 Torr pressure. What is the molar mass of this compound?
a. 21.6 g/mol
b. 162 g/mol
c. 273 g/mol
d.50.8 g/mol
e. 869 g/mol
21.6 g/mol is the molar mass of this compound.
p=175 Torr
v= 1
r=0.82
t= 125 °C= 398 K
density= mass/volume
mass=density × 1
mass=1.14 g/L ×1
mass=1.14 g
PV=nRT
n=PV/RT
n=175×1÷0.82×398
n=0.53 mol
moles= given mass/molar mass
molar mass= given mass/moles
molar mass=1.14 /0.53
molar mass=21.6
Mass per mole is a definition of molar mass. In other terms, molar mass is the total mass of all the atoms in a substance that makes up a mole. It is measured in gram-per-mole units.
For elements or molecules, molar mass is displayed. The molar mass is simply the element's mass represented in atomic mass units in the case of single elements or individual atoms. To put it another way, an atom's atomic mass and molar mass are exactly equal. Molar mass can be used to determine a particle's identification because it is equivalent to atomic mass for individual atoms.
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Balance the following equation:
Answer:
[tex]C_{5} H_{12} + 8O_{2} \\\ - > 5CO_{2} + 6H_{2}O[/tex]
Explanation:
Blank 1: remain blank or put 1
Blank 2: 8
Blank 3: 5
Blank 4: 6
Purpose is to have the same amount of each element on both side of equation
To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element. The balanced equation is
C[tex]_5[/tex]H[tex]_12[/tex]+O[tex]_2[/tex][tex]\rightarrow[/tex]5CO[tex]_2[/tex]+6H[tex]_2[/tex]O
What is Balanced equation?Balanced equation is the one in which the total number of atoms of a species on reactant side is equal to the total number of atoms on product side.
The unbalanced equation is
C[tex]_5[/tex]H[tex]_12[/tex]+O[tex]_2[/tex][tex]\rightarrow[/tex]CO[tex]_2[/tex]+H[tex]_2[/tex]O
The number of atoms of carbon on reactant side is 5 and on product side it is 1. so to balance it we need to multiply CO[tex]_2[/tex] by 5.
C[tex]_5[/tex]H[tex]_12[/tex]+O[tex]_2[/tex][tex]\rightarrow[/tex]5CO[tex]_2[/tex]+H[tex]_2[/tex]O
The hydrogen atom on reactant side is 12 while on product side it is 2, so multiply H[tex]_2[/tex]O by 6.
C[tex]_5[/tex]H[tex]_12[/tex]+O[tex]_2[/tex][tex]\rightarrow[/tex]5CO[tex]_2[/tex]+6H[tex]_2[/tex]O
To multiply oxygen we need to multiply O[tex]_2[/tex] by 8.
C[tex]_5[/tex]H[tex]_12[/tex]+8O[tex]_2[/tex][tex]\rightarrow[/tex]5CO[tex]_2[/tex]+6H[tex]_2[/tex]O
Therefore, the balanced equation is
C[tex]_5[/tex]H[tex]_12[/tex]+O[tex]_2[/tex][tex]\rightarrow[/tex]5CO[tex]_2[/tex]+6H[tex]_2[/tex]O
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how many kilometers are in 230 m
here the 230 m have how many km = 230/1000
=0.23km
Answer:
The answer is 0.23 km.
Divide the length by 1000. Example 230 m / 1000 = 0.23 km
A student is designing an investigation of the distribution of charges in conductors. She will use two conducting spheres mounted on insulating stands in the investigation. The conducting spheres are shown.
Explanation:
explain how the electron was discovered
Since the charge is evenly distributed between the two spheres, each sphere will have a charge of +10 μC. Therefore, the charge on one of the spheres is +10 μC.
What is distribution of charges in spherical conductors ?The distribution of charges in spherical conductors refers to the way in which electric charges are distributed on the surface of a conductor that has a spherical shape.
When a conductor is charged, the charges distribute themselves over its surface in such a way that the electric field within the conductor is zero.
The spheres are connected with a wire and allowed to come to the same charge, which means that the total charge is evenly distributed between the two spheres.
The total charge is (-10 μC) + (+30 μC) = +20 μC. Since the charge is evenly distributed between the two spheres, each sphere will have a charge of +10 μC. Therefore, the charge on one of the spheres is +10 μC.
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Your question is incomplete. But your complete question is as follows:
A student is designing an investigation of the distribution of charges in conductors. She will use two conducting spheres mounted on insulating stands in the investigation. The conducting spheres are shown.
One has a charge of -10 μC and the other has a charge of +30 μ C. They are connected with a wire and allowed to come to the same charge.
What is the charge on one of the spheres?
MULTIPLE CHOICE QUESTION
When an electron is removed from Cesium,
what element does it LOOK LIKE?
Krypton
Xenon
Neon
Argon
Answer:
B. Xenon
Explanation:
On the periodic table, every element has an "atomic number". This number states how many electrons there are in an element.
Cesium's atomic number is 55, which indicates it has 55 electrons. 55 minus 1 is 54 electrons. The element that has 54 electrons is Xenon, whose atomic number is 54.
Where would contour farming and terraces be most likely to be found?
True or False: Neurons transmit information in one direction only.
False
True
Sensory receptors pick up on senses from outside the body. To respond to the sense, what path does the information follow?
motor neuron - interneurons – sensory neuron
interneurons – motor neuron – sensory neuron
sensory neuron – motor neuron – interneurons
interneurons – sensory neuron – motor neuron
motor neuron - sensory neuron - interneurons
sensory neuron – interneurons – motor neuron
Which neuron carries signals from the hand to the spinal cord?
sensory neuron
motor neuron
interneuron
Which neuron carries signals in the body around the spinal cord?
motor neuron
interneuron
sensory neuron
Which neuron carries signals from the spinal cord to the hand?
sensory neuron
motor neuron
interneuron
Why would this path of neurons not work to perform a reflex?
Select all that apply.
the motor neuron should be the interneuron
the motor neuron should be the sensory neuron
the sensory neuron should be the interneuron
the interneuron should be the motor neuron
1) Neurons transmit information in one direction only. it is true
2) Sensory neuron - interneurons - motor neuron.
3) sensory neuron.
4) motor neuron
5) motor neuron.
Neurons transmit information in one direction only.
Sensory receptors pick up on senses from outside the body. To respond to the sense, path does the information follow as:
Sensory neuron - interneurons - motor neuron.
neuron carries signals from the hand to the spinal cord is sensory neuron.
neuron carries signals in the body around the spinal cord is moto neuron.
neuron carries signals from the spinal cord to the hand is motor neuron.
Thus, 1) Neurons transmit information in one direction only. it is true
2) Sensory neuron - interneurons - motor neuron.
3) sensory neuron.
4) motor neuron
5) motor neuron.
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how to balance the following precipitation reaction
K3PO4 + Cu(NO3)2
The balanced equation of the precipitation reaction would be [tex]3Cu(NO_3)_2 + 2K_3PO_4 -- > Cu_3(PO_4)_2 + 6KNO_3[/tex]
What is precipitation?Precipitation reactions are reactions involving two aqueous salts leading to the production of, at least, one insoluble salt or a precipitate.
In the reaction given, [tex]K_3PO_4[/tex] reacts with [tex]Cu(NO_3)_2[/tex]. The two reactants are soluble and will exchange radicals during the reaction to produce [tex]Cu_3(PO_4)_2[/tex], an insoluble salt or a precipitate, and [tex]KNO_3[/tex], a soluble salt.
In order to balance the equation, it must be made to obey the law of conservation of atoms. According to the law, atoms of elements that participate in chemical reactions may change forms but are always conserved in terms of number.
In other words, the number of atoms of each element in the reactants must be equal to their respective numbers in the products.
Thus, the equation that shows that the precipitation reaction obeys the law of conservation of atoms is [tex]3Cu(NO_3)_2 + 2K_3PO_4 -- > Cu_3(PO_4)_2 + 6KNO_3[/tex]
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What are the differences between physical and chemical separation? 
A student is conducting a lab investing solutions. The student starts by adding a set amount of sugar to water. After stirring, all of the sugar has dissolved. The student adds more sugar but does not dissolve. He continues to stir, but the sugar will not dissolve. The student correctly concludes that the first amount of sugar added caused the solution to be.
Sugar dissolves in water because intermolecular connections between the slightly polar sucrose molecules and the polar water molecules release energy.
The energy required to destabilize the structure of both the pure solute and solvent is made up for by the weak bonds that develop between the solute and the solvent. The sugar molecules occupy the space between the water molecules when the sugar dissolves in the liquid. They therefore don't take up any additional space. So the solution's volume stays the same. Because hot water has more energy than cold water, sugar dissolves more quickly in hot water than it does in cold water. When water is heated, the molecules become more energetic and travel more quickly.
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Because of the energy released during intermolecular interactions between the polar water molecules and the slightly polar sucrose molecules, sugar dissolves in water.
The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the pure solute and solvent. When sugar dissolves in a liquid, the sugar molecules take up the space between the water molecules. As a result, they don't contribute any extra room. Thus, the volume of the solution does not change. Sugar dissolves more quickly in hot water than it does in cold water because hot water has more energy. The molecules of water move more swiftly and energetically when it is heated.
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Macmillan Learning A balloon filled with helium has a volume of 20.5 L at 281 K. What volume will the balloon occupy at 249 K? 11
The volume the balloon will occupy at 249 K, given it occupied 20.5 L at 281 K is 18.2 L
How do I determine the volume the balloon will occupy?We know that volume temperature relationship is given by the following formula:
V₁ / T₁ = V₂ / T₂
Where
V₁ and V₂ are the initial and new volumeT₁ and T₂ are the initial and new temperatureWith the above formula, we can obtain the volume of the balloon at 249 K as follow:
Initial volume (V₁) = 20.5 LInitial temperature (T₁) = 281 KNew temperature (T₂) = 249 KNew volume (V₂) =?V₁ / T₁ = V₂ / T₂
20.5 / 281 = V₂ / 249
Cross multiply
281 × V₂ = 20.5 × 249
281 × V₂ = 5104.5
Divide both side by 281
V₂ = 5104.5 / 281
V₂ = 18.2 L
Thus, we can conclude that the volume at 249 K is 18.2 L
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The average kinetic energy of the molecules in a gas sample depends only on the temperature, . However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed
rms speed=3ℳ⎯⎯⎯⎯⎯⎯⎯⎯⎯√
where =8.314 J/(mol⋅K) and ℳ is molar mass in kilograms per mole. Note that a joule is the same as a kilogram‑meter squared per second squared (kg·m2/s2).
What is the rms speed of O2 molecules at 371 K?
rms speed:
m/s
What is the rms speed of He atoms at 371 K?
rms speed:
m/s
The rms speed of O₂ and He molecules at 371 K are 384.8m/s and 192.4m/s respectively.
What is the Root mean square (rms) speed?This refers to the way to calculate a single velocity value for the particles. The average velocity of a gas particle can be calculated using the root mean square velocity formula.
rms speed =[tex]\sqrt{3RTM}[/tex]
Where,
Root Mean Square speed, rms speed
Universal gas Constant,R =8.314 J/(mol⋅K)
Absolute Temperature,T =371 K
Molar mass of substance,M
From the question:M of O₂= 2*8
=16
M of He = 2*2
= 4
rms speed O₂ =[tex]\sqrt{3RTM}[/tex]
= [tex]\sqrt{(3*8.314* 371*16)}[/tex]
=384.8m/s
rms speed He =[tex]\sqrt{3*8.314 *371*4}[/tex]
=192.4m/s
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