2,259.675kj/mol
10.16g of pentane is burned in a calorimeter, 9.87kg of water are heated from 21.6(degree) to 33.7(degrees), the molar heat of reaction for carbon dioxide will be
From the above statement , we have found
pentane C5H12 = 10.16g
H2O = 9.87kg
TI = 21.6°C T2 = 33.7°C
C5H12+8O2=5CO2+6H2O
as per the reaction, one mole of pentane gives 5 mole of carbon dioxide
now:
molar heat of CO2 = ncΔt ,
here n is number of mole, c is specific heat, t is temperature
Q = 5 ×37.35× 12.1
Q= 2,259.675kj/mol
The molar specific heat is the specific heat equivalent to one mole of a material. The quantity of a material, the temperature change, and the type of the substance all affect how much heat must be supplied to a substance to raise its temperature or removed from a substance to reduce it.To know more about molar specific heat visit : https://brainly.com/question/27181520
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A student burnt a metal A
Answer:
Wait what, howd he do that
A 101.96 g sample of a solid is broken down into 53.96 g of aluminum and an unknown amount of
oxygen. if a chemist wants to make 1,937 grams of that solid without any leftovers, how much aluminum
and oxygen should she react together?
1025 g of aluminum with 912.0 g of oxygen should she react together.
What do aluminum and oxygen have in common?Aluminum oxide, with the chemical formula Al₂O₃, is a chemical compound composed of aluminum and oxygen.Aluminum oxide or Alumina (Al2O3) is formed when aluminum (Al) is exposed to air. Aluminum turns silver white and greyish in appearance. Answer: It simply reacts with atmospheric oxygen to form a protective aluminum oxide sheath that prevents corrosion.Aluminum has a strong affinity for oxygen. When a new aluminum surface is exposed to air or another oxidizing agent, a thin, hard film of aluminum oxide forms quickly (or hydrated oxide in non-stagnant water). This oxidation of aluminum is precisely what makes aluminum corrosion resistant.Only trace amounts of aluminum that you may inhale, ingest, or come into contact with on your skin will enter your bloodstream. Aluminum exposure is usually not harmful, but excessive exposure can be harmful to your health.To learn more about aluminum and oxygen refer to
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Which of the following scenarios accurately describes magnitude and direction? (1 point)
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 10
O
kN.
A force of equal magnitude that also travels northward would not stop a force traveling the same
direction.
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5
KN.
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5
kg.
O
Answer:
Explanation:
1.) Which statement best describes force?
answer: Force is a vector quantity that measures both direction and magnitude of a push or pull on an object.
2.) A soccer ball is traveling downfield with a force of 1.2 kN and strikes another soccer ball that is stationary. Which of the following describes the result of the collision?
answer: The stationary soccer ball will begin moving downfield and the ball that struck it will slow down.
3.) Which of the following scenarios accurately describes magnitude and direction?
answer: A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN.
4.) What is force directly proportional to?
answer: the acceleration and mass of an object
5.)Two ropes are being used to suspend a box. Each rope is exerting 5 N of upward force. If the forces are balanced and the box is stationary, how much force is being exerted by the box itself and in which direction?
answer: The box exerts 10 N of force downward.
Hope this helps :)
A car traveling northward with 5 kN of force could be brought to a stop by a southward force of 5 kN is accurate scenario to explain magnitude and direction.
Force is a vector quantity that measures both direction and magnitude of a push or pull on an object . It can also be explain as , force is an external agent capable of changing a body’s state of rest or motion. It has a magnitude and a direction.
The direction towards which the force is applied is known as the direction of the force, It is represented by F and unit is Newton & S.I. unit is kg ·m/s².
F = ma
Where, m is the mass of body and a is the acceleration of the body .
Acceleration of a body or an object is given as, the rate of change of the velocity of an object with respect to time. The unit of acceleration is m/s².
a = Δv/Δt
Where , Δv is the change in acceleration and Δt change in time .
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need some help with people problems anybody up for it?
The Covid-19 pandemic has raised awareness of a situation that can be surprisingly unpleasant for many people: asking for help. From practical difficulties, like finding someone to do your food shopping, to emotional ones, like dealing with anxiety and sadness alone.
Problems with mental health do not resolve themselves. Treatment and recovery may be more challenging the longer an illness lasts. When anxiety and trauma are not addressed, they can both worsen and result in panic episodes and post-traumatic stress disorder. an incapacity to handle issues or regular tasks. a sense of detachment or disconnect from daily activity imaginative or unusual thinking. excessive worry persistent melancholy, depression, or apathy.
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explain breifly why the 1st ionization energy of "B" is less than of "Be" less than of the atomic number of "B" is greater than that of "Be"
Explanation:
B → Boron → Atomic number 5
Be → beryllium → Atomic number 4
B - Hybridization → 1S² 2S² 2P¹
[tex] \sf Boron - \boxed{↿↾} \: \boxed{↿↾} \: \boxed{ \small↾ }\huge\boxed{ }\huge\boxed{ }[/tex]
Be - Hybridization → 1S² 2S²
[tex] \sf Beryllium →\boxed{↿↾} \: \boxed{↿↾} \: \huge\boxed{ }\huge\boxed{ }\huge\boxed{ }[/tex]
from above data we can see that the outermost orbital of Beryllium i.e. 2S is fully filled & that of boron have 1 electron in 2P orbital. It will require more energy to remove one electron from beryllium Because it will disturb the stability, on other hand the boron will lose one electron easily to attain full filled outermost electron hence it will require less energy for 1st ionization.
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An average sample of lithium contains 7.5% lithium-6 and 92.5% lithium-7. Lithium-6 has an atomic mass of 6.015 amu and lithium-7 has an atomic mass of 7.016 amu. What is the average atomic mass of a sample of lithium? A B C D 6.09 amu 6.49 amu 6.52 amu 6.94 amu
The average atomic mass of Lithium is found to be 6.94 amu. Thus, (d) is the correct answer.
Atomic mass is the total number of protons and neutrons present in the nucleus of the atom when it is at rest. On comparison with protons and neutrons, electrons have negligible mass and thus atomic mass is the total sum of protons and neutrons.
Given:
% abundance of Li-6, Li6 = 7.5%
% abundance of Li-7, Li7 = 92.5%
Atomic mass of Li-6, m6 = 6.015 amu
Atomic mass of Li-7, m7 = 7.016 amu
To find:
Average atomic mass = ?
Formula:
Average atomic mass, [tex]Avg = \frac{(Li6 * m6) + (Li7 * m7)}{100}[/tex]
Avg = [tex]\frac{(7.5 * 6.015) + (92.5 * 7.016)}{100}[/tex]
Avg = (45.1125 + 648.98) / 100
Avg = 694.0925 / 100
Avg = 6.940 amu
Result:
Therefore, 6.94 amu is the average atomic mass of Lithium.
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how many moles of tin are in 2.01 x 10^23 atoms of tin?
Using Avogadro’s number, 0.33 moles of tin are present.
The number of particles (atoms or molecules) in each mole of a material is known as the Avogadro’s number. It's represented with a symbol [tex]N_A[/tex].
Avogadro's number of molecules of that substance make up one mole of an atom, according to the mole concept.
1 mole = 6.02 x [tex]10^2^3[/tex] atoms
Given:
No. of atoms of tin = 2.01 x [tex]10^2^3[/tex]
Avogadro’s number, [tex]N_A[/tex]= 6.02 x [tex]10^2^3[/tex]
To find:
No. of moles, n = ?
Formula:
n = No. of atoms of tin / Avogadro’s number
Calculations:
n = 2.01 x [tex]10^2^3[/tex] / 6.02 x [tex]10^2^3[/tex]
n = 2.01 / 6.02
n = 0.33 moles
Result:
The number of moles present in 2.01 x [tex]10^2^3[/tex] atoms of tin is 0.33 moles
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The ocean floor is largely made of______ formed by magma from earth’s mantle that cools and hardens
The ocean floor is largely made of Volcanic rock formed by magma from earth’s mantle that cools and hardens.
What is ocean floor called?The ocean's bottom is referred to as the seabed, seafloor, ocean floor, and ocean bottom. All oceanic floors are referred to as "seabeds." The various types of sediment that make up practically the whole ocean floor include mud, sand, and gravel.
What materials compose the ocean floor?Deposits of minerals we need every day, such copper, zinc, nickel, gold, silver, and phosphorous, can be found on the seafloor. These deposits are nodules on silt from the abyssal plain that are typically 3 to 10 centimetres (1 to 4 inches) in diameter and appear as crusts on volcanic and other rocks.
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Which sentence describes an item that would help this geologist make better observations about the rocks while in the field?
Answer:
Magnifying glass or a special device that resembles a handheld microscope, used to observe ink placement of printers
Explanation:
Suppose naoh standardization of khp determined that a volume of 25. 00 ml naoh has a concentration of 0. 049 m. Suppose 22. 20 ml of khp was used to get to the endpoint in this standardization. What is the mass of khp dissolved in 50. 00 ml of the standardization khp titrant?.
Standardization titrant was made by dissolving 0.5634 g of potassium hydrogen phthalate (KHP) in 50.00 mL of water.
1 mol of KHP will react with 1 mol of NaOH to form 1 mol of mixed salt and 1 mol of water. Based on this molar ratio, the number of moles of NaOH will be equal to the number of moles of KHP in the standardization titrant.
c = n/V, so n = c * V = 0.049 M * 0.025 L = 0.001225 mol of NaOH and KHP
This result can help us calculate the amount of KHP present in the whole 50.00 mL of the titrant:
22.20 mL : 0.001225 mol = 50.00 mL : X
X = 0.001225 mol * 50.00 mL / 22.20 mL = 0.002759 mol
Following that, we can use the KHP molar mass (204.22 g/mol), to get to the mass of it (in grams) dissolved in the sample:
n = m/M, so m = n * M = 0.002759 mol * 204.22 g/mol = 0.5634 g
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using standard electrode potentials, calculate δg∘ and use its value to estimate the equilibrium constant for each of the reactions at 25 ∘c. part a pb2 (aq) mg(s)→pb(s) mg2 (aq)
The equilibrium constant can be obtained using ΔG°rxn = -RT lnK.
On the basis of this, 2H+ + 2e- → H2(g) reduction.
Therefore E° = 0V
Pb2+ + 2e- ⇄ Pb(s) - 0.126
Mg2+ + 2e- ⇄ Mg(s) -2.372
For total E°cell potential,
E°cell = Ered - Eoxd
Eoxd = -Ered of the one being oxidised
E°cell = -2.372 - (-0.126) = -2.246
E°cell = -2.246 V
Thus, calculating dG:
dG = -n x F x E°cell
dG = -2*96500*(-2.246)
=433478 J/mol
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Put these steps of solar system formation in order.
X
A solar nebula forms.
Intro
The solar nebula flattens
into a disk.
Gravity pulls the solar
nebula upon itself.
Gas becomes hot and
dense and forms a star.
The solar nebula spins
faster and faster.
Done
Order of solar system :
1. A solar nebula develops.
3. The solar nebula is pulled in on itself by gravity.
5. The solar nebula continues to rotate quickly.
2. The solar nebula becomes flat and forms a disk.
4. Gas turns hot and dense and develops into a star.
What are the features of Solar Nebula?It is a cloud with a disc shape.
It is made up of the gas and dust left over after the sun forms.
The following are the steps involved in the creation of the solar system:
A solar nebula first appears after the sun is formed.
In the subsequent stage, gravity uses its force to pull the nebula toward it.
This force causes the nebula to travel too swiftly.
Gravity causes the nebula to spin quickly, giving it the appearance of a disc.
Finally, this disc-shaped nebula's temperature rises, making the gases inside it hot and heavy.
This results in a "star" (ball of fire) being produced in the end.
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The complete question is:
Put these steps of solar system formation in order.
1) A solar nebula forms.
2) The solar nebula flattens into disk
3) gravity pulls the solar nebula upon itself
4) gas becomes hot and dense and forms a star
5) the solar nebula spins faster and faster
The table shows the solubility of two substances in water at 20 °C.
Solubility of Substances
Mass
(kg) Solubility of Sodium Chloride
(g per 100 g of water) Solubility of Lead Nitrate
(g per 100 g of water)
100 L K
200 36 54
Part 1: What will be the values of L and K for 100 kg of each substance?
Part 2: Explain your answer for Part 1.
K and L values for each substance are 108g and 18g, respectively.
What is solubility?Solubility is the formation of a new bond between solute molecules and solvent molecules. Solubility is the maximum concentration of solute that dissolves in a known concentration of solvent at a given temperature in terms of quantity.
We calculated the solubility of NaCl in 100g of water to be 36g.
Lead Nitrate solubility in 100g water = 54g
Determine the value of L:-
200Kg sodium chloride solubility = 36g
100kg Sodium chloride Solubility = [tex]\frac{36g}{100kg} *200kg[/tex] = 18g
Determine the value of K:-
100Kg Lead Nitrate Solubility = 54g
200kg Lead Nitrate Solubility = [tex]\frac{54g}{100kg} *200kg[/tex] = 108g
Solubility difference = solubility of K - solubility of L
Solubility difference = 108g - 18g = 90g
Thus, the 108g and 18g, are the values for K and L respectively.
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sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water. the best term to describe this mixture would be . view available hint(s)
Sodas typically contain flavorings, coloring agents, sugar, and carbon dioxide dissolved in water, so the best term to describe this would be aqueous solution.
What are Aqueous solutions?Aqueous solutions are the solutions that contain liquid water in them as the solvent that is used to dissolve the various solutes.
When we mix this sugar, flavorings, coloring agents, and carbon dioxide together, we have the aqueous solution of soda.
The word aqueous, which is derived from the Greek aqua, denotes that it is dissolved in or related to water.
It is shown in chemical equations by adding (aq) to the relevant chemical formula.
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Complete Question
Sodas typically contain sugar, flavorings, coloring agents, and carbon dioxide dissolved in water. The best term to describe this mixture would be _____.
A) an aqueous solvent
B) an aqueous solution
C) a solution
D) a solvent
E) a solute
Nickel forms a square planar complex with that has a charge of. What is the coordination number and oxidation state of the nickel atom?
Answer: 4
Explanation:
please help will give brainlist!!! POINTS: 30
Answer:
Test the water with an actual test or put something that would react to acid in water to test it.
Explanation:
test the water for acidic contents
Claim- the water is acidic
Evidence- the test said it had an acidic composition
conclusion- the water is acidic
How many molecules are in 60 mg of vitamin C: C6H8O6 ?
The number of molecules in 60 mg of vitamin C: C6H8O6 is 2.053 × 10¹⁸ molecules.
How to calculate number of molecules?The number of molecules in a substance can be calculated by multiplying the number of moles in that substance by Avogadro's number.
Firstly, the number of moles in 60mg of vitamin C must be calculated as follows:
Molar mass of C6H8O6 = 12(6) + 1(8) + 16(6) = 176g/mol
number of moles = 0.06g ÷ 176g/mol = 3.41 × 10-⁴moles
Number of molecules = 3.41 × 10-⁴moles × 6.02 × 10²³
Number of molecules = 2.053 × 10¹⁸ molecules
Therefore, the number of molecules in 60 mg of vitamin C: C6H8O6 is 2.053 × 10¹⁸ molecules.
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How many significant figures are in the measurement 0.03802 mL?
Answer:
5
Explanation:
3 6 5 7 0
Put the following elements into the correct order from smallest to largest radius. Al, Ga,
Br, I
From Smallest to Largest:
Br
I
Al
Ga
Circle or underline the correct answer
3- True or false: it is OK to leave your bags in the aisle
4- True or false: horseplay is fine before or after the lab 5- True or false: you do not need goggles or gloves for lab
6- True or false: you do not need to wash your hands after lab
7- True or false: it is OK to eat and drink in a lab class
8- True or false: it is OK to pour chemicals back into the bottle it came from
9-True or false: microscopes can be handled with one hand only
10-True or false: you do not need to read the instructions before lab
11-True or false: respect safety rules and guidelines
Answer:
3- True or false: it is OK to leave your bags in the aisle
4- True or false: horseplay is fine before or after the lab
5- True or false: you do not need goggles or gloves for lab
6- True or false: you do not need to wash your hands after lab
7- True or false: it is OK to eat and drink in a lab class
8- True or false: it is OK to pour chemicals back into the bottle it came from
9-True or false: microscopes can be handled with one hand only
10-True or false: you do not need to read the instructions before lab
11-True or false: respect safety rules and guidelines
Explanation:
I bolded the ones that it's supposed to be. You're teacher gave you a lot of false's though
One gram of sodium chloride will take longer to dissolve in a solution of 2 m glucose than in a solution of pure water. What is the most reasonable explanation for this observation?.
The most reasonable explanation is, Sodium chloride and Water are both polar compounds while Glucose is nonpolar.
Since glucose is a non-polar compound while NaCl is polar, we know that polar compounds will dissolve in polar solvents while non-polar compounds will dissolve in non-polar ones. water also dissolves NaCl but not glucose because it is a polar molecule.
Due to their bonds with elements like nitrogen, oxygen, or sulfur, polar compounds have distinct zones of positive and negative charge.
Non-polar covalent compounds, on the other hand, are those in which there is no change in electronegativity. In these compounds, the electronegativity does not change, preventing the motion of the bond pair's electrons in the direction of the linked atoms.
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Why is there no reaction with the following; Aluminium oxide + copper
A substance freezez at -58°C. Therefore, the substance melts at
Answer:58°C
Explanation:
I believe this is the answer
If the average speed of a water molecule at 25°c is 640 m/s, what is the average speed at 100°c?.
The average speed of a water molecules at 25°C is 640 m/s, the average speed at 100 °C is 715.8 m/s.
The average speed of molecules is defined as the average speed of all individual the molecules. this mean it is equal to sum of speed of all the molecule divide by total no. of molecules.
Average speed ( V ) = [tex]\sqrt{8RT / \pi M}[/tex]
given :
Temperature of molecule T1 = 25°C = 298 K
Average velocity of water at 25°C ,V1 = 640 m/s
Temperature T2 = 100°c = 373 K
Average velocity of water at 100°C ,V2 = ?
now, computed the data, we get
V2 / V1 = [tex]\sqrt{T2 / T1}[/tex]
V2 / 640 m/s = [tex]\sqrt{373 K / 298 K}[/tex]
V2 = 715.8 m/s.
Thus,The average speed of a water molecules at 25°C is 640 m/s, the average speed at 100 °C is 715.8 m/s.
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The half-life of cesium-137 is 30.2 years. if the initial mass of a sample of cesium-137 is 1.00kg, how much will remain after 151 years?
0.03125 kg/31.25 g will remain after 151 years.
How long does cesium stay in the body?Cesium-137 is significant due to its prevalence, relatively long half-life (30 years), and potential health effects. As it decays to the barium isotope, Ba-137m (half-life = 2.6 minutes), cesium-137 emits beta particles.Caesium-137 (Cs-137) is a dangerous and toxic radioisotope with a relatively long half-life of 30.17 years that emits beta and gamma rays. Caesium-137 radioisotope can be found in nuclear waste as a fission product in nuclear reactors or as a fallout from nuclear power plantsCs-135 has a half-life of 2,300,000 years, making it primarily a concern for the long-term performance of the disposal system. Cs-137 has a half-life of 30.08 years, making it a concern for storage, transfers, transportation, as well as the preclosure and handling phases of disposal.A reaction's half-life is the time it takes for the reactant concentration to fall to one-half of its initial value. The half-life of a first-order reaction is a constant that is proportional to the rate constant: t1/2 = 0.693/k.The "reserve" contains plutonium-239, which has pollinated a hundred-kilometer zone around the Chernobyl nuclear power plant, according to experts. It has a half-life of 24,000 years.To learn more about cesium-137 refer to
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How many Pa are equivalent to 3.05 atm?
Answer:
309041.2
Explanation:
How are particles in a solid like people sitting in a movie theater?
What is substance in your own words?
Which option describes the particles of water as the liquid water actively boils?
(1 point)
Responses
The particles will have the same average kinetic energy and the same temperature during boiling.
The particles will lose kinetic energy and increase temperature during boiling.
The particles will have the same average kinetic energy and a decrease in temperature during boiling.
The particles will lose kinetic energy and decrease temperature during boiling.
2.
What does temperature measure? (1 point)
Responses
the empty space between the particles
the average kinetic energy of the particles
the heat of the particles
the total energy of the particles
3.
Which is the best interpretation of the two flat portions of the graph?
(1 point)
Responses
These show where kinetic energy is increasing.
These show where changes of state are occurring.
These show where temperature is 0ºC.
These show where thermal energy does not exist.
The particles will lose kinetic energy and increase the temperature during boiling. Temperature measures the heat of particles. The flat portions show where kinetic energy is energy.
What is kinetic energy?
Kinetic energy is a type of energy that a moving object or particle has. An item accumulates kinetic energy when work, which involves the transfer of energy, is done on it by exerting a net force.
A moving object or particle has kinetic energy, which relies on both its mass and its rate of motion. The kind of motion might be vibration, rotation on an axis, translation (or travel along a path from one point to another), or any combination of these.
Therefore the correct options are 1- B, 2-B, and 3-A.
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what would you say to a classmate who said that he wanted to fulfill his science requirement by taking environmental science to get out of chemistry
The most important to know for those who wanted to fulfill science requirements by taking environmental science and avoiding chemistry is that this field is fundamental to understand the real world.
Why Chemistry is fundamental in environmental sciences?Chemistry is fundamental in environmental sciences because we need to know all forces that bond materials, atoms and objects in nature, which can only be achieved by having a real consideration of chemistry.
In conclusion, the most important to know for those who wanted to fulfill science requirements by taking environmental science and avoiding chemistry is that this field is fundamental to understand the real world.
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