Calculate a missing equilibrium concentration Question For the following equilibrium: 2A+B=C+ 2D = 0.80 M, and D = 0.25 M, and Kc = 0.22, what is the If equilibrium concentrations are B] = 0.44 M, C equilibrium concentration of A? . Your answer should include two significant figures (round your answer to two decimal places).
Answers
In this case, the equilibrium concentration of A is found to be 0.077 M.
How to calculate equilibrium concentration of A?The equilibrium constant expression for the given reaction is:
Kc = ([C][D]²) / ([A]²[B])
Substitute the given equilibrium concentrations:
0.22 = (C²) / ([A]²(0.44))
Rearrange the equation to solve for [A]:
[A]² = (C²) / (0.22(0.44))
[A]² = 0.059[C]
Substitute the given equilibrium concentration of D to find [C]:
0.25 = 2(0.80) + C + 2(0.25)
C = 0.10 M
Substitute [C] into the equation for [A]²:
[A]² = 0.059(0.10)
[A]² = 0.0059
Take the square root to find [A]:
[A] = 0.077 M
We have found that the equilibrium concentration of A is 0.077 M.
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Related Questions
6.00g of gold was heated from 20.0c to 22.0c. How much heat was applied to the gold
Answers
q = mass x specific heat x delta T.
Hydrogen bromide (HBr) is a strong, highly corrosive acid. What is the pOH of a 0.0375M HBr solution?
A. 12.574,
B. 12.270,
C. 1.733,
D. 1.433.
Answers
The pOH of a 0.0375M HBr solution is approximately 12.574, and the corresponding answer choice is A. This value is obtained by considering the autoionization of water and calculating the hydroxide ion concentration.
To determine the pOH of a 0.0375 M hydrobromic acid (HBr) solution, we need to first find the hydroxide ion concentration ([OH-]). Since HBr is a strong acid, it dissociates completely in water, forming H+ ions and Br- ions. However, HBr is not a base, so there is no direct contribution of OH- ions from the acid itself. Instead, we need to consider the autoionization of water.
The autoionization of water involves the generation of H+ and OH- ions in equal amounts. At 25 degrees Celsius, the concentration of H+ and OH- ions in pure water is 1.0 x 10^-7 M each. In an acidic solution like HBr, the H+ concentration is significantly higher, but the OH- concentration will still be affected.
To calculate the OH- concentration, we can use the equation Kw = [H+][OH-] = 1.0 x 10^-14. Rearranging the equation, we find [OH-] = Kw / [H+].
Given that HBr is a strong acid, we can assume that it dissociates fully, resulting in [H+] = 0.0375 M. Plugging these values into the equation, we get [OH-] = (1.0 x 10^-14) / (0.0375).
Calculating this gives us [OH-] ≈ 2.67 x 10^-13 M.
Now that we have the [OH-] concentration, we can find the pOH using the formula pOH = -log[OH-]. Taking the negative logarithm, we get pOH ≈ -log(2.67 x 10^-13).
Calculating this value yields pOH ≈ 12.574.
Therefore, the correct answer is A. 12.574.
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pOH determination.
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the sodium-22 nuclide radioactively decays by positron emission. write a balanced nuclear chemical equation that describes this process.
Answers
A balanced nuclear chemical equation describes this process is:
Na-22 → Ne-22 + e+ (or β+)
To write a balanced nuclear chemical equation for this process, follow these steps:
1. Identify the initial nuclide: Sodium-22 (Na-22) has an atomic number of 11 (protons) and a mass number of 22 (protons + neutrons).
2. Identify the emitted particle: Positron emission involves the release of a positron, which has the symbol e+ or β+ and has an atomic number of -1 and a mass number of 0.
3. Determine the resulting nuclide: In positron emission, a proton in the nucleus is converted into a neutron, decreasing the atomic number by 1.
Thus, the resulting nuclide will have an atomic number of 10 and a mass number of 22, which corresponds to neon-22 (Ne-22).
Now, we can write the balanced nuclear chemical equation for this process:
Na-22 → Ne-22 + e+ (or β+)
This equation shows that sodium-22 decays by positron emission to form neon-22 and a positron.
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Would outer space be an ideal spot for a concert? Why or why not? List, write, or draw your response.
Answers
Answer:
No.
Explanation:
Outer space would not be an ideal spot for a concert for many reasons. One of which, is that there is no sound in space. On Earth, sound travels through air molecules. In outer space there are no air molecules for the sound vibrations to bounce off of.
For many reasons, holding a concert in outer space would not be a good idea. One of them is that sound does not exist in space. Sound moves through air molecules on Earth. There are no air molecules for the sound waves to bounce off of in space.
What is called outer space?The term outer space is defined as the region beyond a planet's atmosphere. It has far few molecules, with lots of empty space between them so, it's called as outer space.
The sound travels through the vibration of particles, and space is a vacuum. On Earth, sound mostly travels to our ears by way of vibrating air molecules, but in near-empty regions of space there are no particles to vibrate therefore, there is no sound.
Thus, Sound moves through air molecules on Earth. There are no air molecules for the sound waves to bounce off of in space.
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maladaptive or dangerous use of a chemical substance is referred to as
Answers
Maladaptive or dangerous use of a chemical substance is referred to as Drug Abuse.
What is Drug AbuseMisusing or using a dangerous chemical substance in a harmful way is often called substance abuse or substance misuse. Substance abuse means using drugs or alcohol too much and in a bad way.
This can harm your body, mind, relationships, and how you function in general. If you or someone you know is having trouble with drugs or alcohol, it's really important to ask for help. There are many different ways to get help and support for this problem.
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Balance the following chemical equations.
a) Ba Cl2 + H2SO4 BaSO4 + HCl.
b) Calcium hydroxide + Carbon dioxide Calcium carbonate + Water.
c) Aluminum + Copper chloride Copper + Aluminum chloride
d) Sulphur dioxide + Oxygen Sulphur trioxide
e) NH3+ CuO Cu + N2 + H2O
Answers
Answer:
See the explanation
Explanation:
In this question we have to take into account that we have to get the same amount of atoms on both sides, so:
Reaction 1
\(BaCl_2~+~H_2SO_4~=>~BaSO_4~+~2HCl\)
We have 1 Ba, 2 Cl, 2 H and 4 O on both sides
Reaction 2
\(Ca(OH)_2~+~CO_2~=>~CaCO_3~+~H_2O\)
We have 1 Ca, 2O, 2 H and 1 C on both sides
Reaction 3
\(2Al~+~3CuCl_2~=>~2 AlCl_3~+~3Cu\)
We have 2 Al, 3 Cu, and 3 Cl on both sides
Reaction 4
\(2SO_2~+~O_2~=>~2SO_3\)
We have 2 A and 6O on both sides
Reaction 5
\(2NH_3~+~3CuO~=>~3Cu~+~N_2~+~3H_2O\)
We have 2 N, 3 H, 3 Cu and 3O on both sides.
I hope it helps
predict the effect of change in temperature and pressure of the dissociation of PCL5
Answers
Answer:
Ps5
Explanation:
Answer:
well the answer to that is climate change
Explanation:
because with climate change the temperature and hot and cold it is depending on where you live
Which of the following is NOT a product of photosynthesis?
A. glucose
B. energy
C. oxygen
D. carbon dioxide
Answers
B is the answer..............
Answer:
D. Carbon Dioxide
Explanation:
Carbon is what enters the plant. It isn't a product of the plant.
What is the net ionic equation when agno3 and nh4cl are mixed?
Answers
The net ionic equation for the reaction between AgNO3 and NH4Cl is: Ag+(aq) + Cl-(aq) → AgCl(s)
When AgNO3 (silver nitrate) and NH4Cl (ammonium chloride) are mixed, a white precipitate of AgCl (silver chloride) is formed.
AgNO3 is a soluble salt that dissociates in water to form Ag+ and NO3- ions, while NH4Cl also dissociates in water to form NH4+ and Cl- ions. When these two solutions are mixed, the Ag+ ions react with the Cl- ions to form an insoluble precipitate of AgCl, which is a white solid. The ammonium ion (NH4+) and the nitrate ion (NO3-) are spectator ions and do not participate in the reaction.
The overall balanced chemical equation for the reaction is:
AgNO3(aq) + NH4Cl(aq) → AgCl(s) + NH4NO3(aq)
The net ionic equation shows only the species that are involved in the reaction and excludes spectator ions. Therefore, the net ionic equation for the reaction between AgNO3 and NH4Cl is:
Ag+(aq) + Cl-(aq) → AgCl(s)In the net ionic equation, the ammonium ion (NH4+) and the nitrate ion (NO3-) are not shown since they do not participate in the reaction.
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Synergistic effects of toxicants that are mixed together ________.
are not numerous in the natural environment
typically have simple additive effects
often are multiplicative (the mixed toxicants may multiply each other's effects)
always involve synthetic toxicants
have effects that tend to cancel one another out
Answers
often are multiplicative (the mixed toxicants may multiply each other's effects).
When toxicants are mixed together, they can exhibit synergistic effects, which means that the combined effect of the toxicants is greater than the sum of their individual effects. Synergistic effects are characterized by an enhancement or multiplication of the toxicity when two or more toxicants are present together. This can result in a more significant impact on organisms or systems than would be predicted based on the effects of each toxicant alone.
Synergistic effects are not uncommon in the natural environment and can occur with a variety of toxicants, including both natural and synthetic substances. It is important to note that while synergistic effects are often observed, the specific interactions between different toxicants can vary, and not all combinations will result in synergy.
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the pka of acetic acid is 4.76. what is the ratio of [ch3cooh] to [ch3coo−] at ph = 4.76?
Answers
The ratio of [CH₃COOH] to [CH₃COO⁻] is 1:1 at pH 4.76, meaning that equal amounts of acetic acid and its conjugate base are present in the solution.
To find the ratio of [CH₃COOH] to [CH₃COO⁻] at pH = 4.76, we can use the Henderson-Hasselbalch equation, which is:
pH = pKa + log ([A⁻]/[HA])
In this case, the pKa of acetic acid is 4.76, and the pH is also 4.76. Plugging these values into the equation, we get:
4.76 = 4.76 + log ([CH₃COO⁻]/[CH₃COOH])
Since both sides of the equation are equal, it means the logarithmic term must be equal to 0:
0 = log ([CH₃COO⁻]/[CH₃COOH])
To find the ratio, we can take the antilog of both sides:
1 = [CH₃COO⁻]/[CH₃COOH]
This indicates that the ratio of [CH₃COOH] to [CH₃COO⁻] is 1:1 at pH 4.76, meaning that equal amounts of acetic acid and its conjugate base are present in the solution. This pH value represents the buffering capacity of the acetic acid/acetate system, as the solution can effectively resist changes in pH when small amounts of acids or bases are added.
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To express very large or very small numbers, scientists use what
Answers
How many moles of atoms are in 50 atoms Ba
Answers
moles of atoms in 50 atoms of barium are 301.15 × 10^23
We may determine how many chemicals or particles are included in one mole using Avogadro's number.Chemistry's fundamental building block is an atom. It is the smallest fraction of matter into which electrically charged particles cannot be released. It is also the smallest piece of substance with chemical element-like characteristics.A mole of any substance is equal to 6.023 x 10^23, or Avogadro's number. Additionally, it is employed to express concentrations in terms of moles per litre or molecular weight.The number of atoms in exactly 12 grammes of pure carbon-12 is the value of a mole.Chemical element barium has the chemical symbol Ba and atomic number 56. In group 2, it is the fifth element.1 mole of substance = 6.023 x 10^23
so in 50 atoms of Ba = 50 × 6.023 × 10^23
= 301.15 × 10^23
Therefore, moles in 50 atoms of Ba is 301.15 × 10^23.
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Which statement describes proper conduct in the laboratory?
Select one:
O a. Eating snacks in the laboratory is allowed.
O b. In order to identify things they should be tasted.
O c. Colorless fumes should be identified by direct smelling.
O d. Be aware of the location of safety and first aid equipment.
Answers
Answer:
D.
Explanation:
I mean. It's logic for sure
Answer:
Its D and pls mark brainliest
Explanation:
Which one of the following exhibits dipole-dipole attraction between molecules?
a. co2
b. br2
c. ph3
d. c10h22
e. ccl4
Answers
The correct answer is (c) ph3.
Phosphine (PH3) exhibits dipole-dipole attraction between molecules.
Dipole-dipole attraction occurs between polar molecules that have a positive end and a negative end. This happens when there is a significant difference in electronegativity between the atoms in the molecule, causing a separation of charges. In the case of phosphine (PH3), the electronegativity difference between phosphorus and hydrogen atoms creates a dipole, with the phosphorus atom being slightly more negative and the hydrogen atoms being slightly positive.
This dipole-dipole attraction between phosphine molecules contributes to its higher boiling point compared to nonpolar molecules like carbon dioxide (CO2), bromine (Br2), and tetrachloromethane (CCl4). These molecules lack a dipole moment because their bonds are nonpolar or symmetrical, so they do not exhibit dipole-dipole attractions.
It's important to note that although molecules like CO2 and CCl4 contain polar bonds, their overall molecular shape results in a cancellation of the individual bond dipoles, making them nonpolar overall. This means they do not exhibit dipole-dipole attraction between molecules.
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Scientist discovered a species that doesn’t have any organelles. what organism could it be?
A. Grass
B. Yeast
C. Slime mold
D. Bacteria
Answers
Scientist discovered a species that doesn’t have any organelles. organism could it be Bacteria.
Organelles are the tiny organs of the cell. organelles have one or more than one jobs to perform. The most important cell organelles is nuclei. Bacteria is single cell organism having cellular DNA and no organelles. Bacteria belongs to prokaryotic cells. Prokaryotic cells are smaller than the eukaryotic cells. Prokaryotic cell do not have nucleus and do not have organelles. You can find bacteria in almost everywhere in earth. some bacteria can survive in extreme temperature and pressure.
Thus, Scientist discovered a species that doesn’t have any organelles. organism could it be Bacteria.
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An object's mass is a measure of how much matter makes it up. An object's weight is a measure of the gravitational force that acts
on it. An object's mass is always its weight
OA
equal to
ОВ.
proportional to
C.
double
OD
half of
Answers
Answer:
its a
Explanation:
Answer:
c
Explanation:
****************************************************************
Answers
******************* ijustwantthepoints *************************
for benzene, ae=30 and ne = 38, look up the structure of benzene in your textbook, explain how th e8 electron deficciency is eliminated by the structure of the molecule
Answers
Benzene is a molecule with the chemical formula C6H6. According to the textbook, the structure of benzene is a six-membered ring with alternating double bonds and single bonds.
Each carbon atom in the ring is bonded to one hydrogen atom. The structure of benzene can be represented as follows:
The ae (atomic electrons) of benzene is 30, and the ne (number of electrons needed for a full octet) is 38. This means that benzene has an 8-electron deficiency.
However, the structure of the molecule eliminates this deficiency by having alternating double bonds and single bonds in the ring.
The double bonds provide extra electrons to the carbon atoms, allowing them to have a full octet.
Additionally, the double bonds are delocalized, meaning that the electrons are spread out over the entire ring, further eliminating the electron deficiency.
This delocalization of electrons also gives benzene its characteristic stability and aromaticity.
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3. When aqueous solutions of sodium phosphate (Na3PO4) and chromium(III) chloride (CrCl3) react, chromium(III) phosphate forms as a
precipitate.
Identify the spectator ions and write a balanced net ionic
equation for this reaction.
The ions Cr3+ and PO,?-combine to form the precipitate.
Which two ions are spectator ions?
The net ionic reaction is Cr3+ + PO42 ..
Answers
The four ionic species initially in solution are Na⁺, PO₄³⁻, Cr³⁺, and Cl⁻. Since the precipitate is composed of Cr³⁺ and PO₄³⁻ ions, the spectator ions must be Na⁺ and Cl⁻.
The complete ionic equation is 3Na⁺(aq) + PO₄³⁻(aq) + Cr₃⁺(aq) + 3Cl⁻(aq) → 3Na⁺(aq) + 3Cl⁻(aq) + CrPO₄(s).
So the balanced net ionic equation for this reaction would be Cr³⁺(aq) + PO₄³⁻(aq) → CrPO₄(s).
Answers:
Which two ions are Spectator Ions?
Na+
Cl-
The net ionic reaction is Cr2+PO42...
Cr2(PO4)3
3.Which of the following isotopes should be expected to be radioactive?Select one:a. Ab. Bc. Cd. D
Answers
Explanation:
To find the isotope that is expected to be radioactive we have to compare the given isotopes with the ones that we find the in the periodic table.
(A) Ti:
Isotope ----> atomic mass = 48 atomic number = 22
Periodic table ---> average atomic mass = 47.9 atomic number = 22
(B) Sr:
Isotope ----> atomic mass = 88 atomic number = 38
Periodic table ---> average atomic mass = 87.6 atomic number = 38
(C) Os:
Isotope ----> atomic mass = 192 atomic number = 76
Periodic table ---> average atomic mass = 190.2 atomic number = 76
(D) Pu:
Isotope ----> atomic mass = 244 atomic number = 94
Periodic table ---> average atomic mass = 244 atomic number = 94
If we take a look at them we will see that the only one that is different is osmium. The atomic mass of the isotope is 192 amu, that means that this isotope has 2 more neutrons than the average atom of the element. So we can expect that it could be radioactive.
Answer: C. Os
Different elements have different numbers of:
Subatomic particles.
Protons.
Electrons.
All of the above.
Answers
What does the host mean when he says that the acid has "donated a proton" to the water?
A.
When hydrochloric acid is dissolved in water, a proton disappears in the chemical reaction.
B.
When hydrochloric acid dissociates, a positive hydrogen atom is accepted by water to form H₃O+.
C.
When hydrochloric acid dissociates, a negative hydrogen atom is accepted by water to form H₃O-.
Answers
Answer:
Option B
Explanation:
As Brønsted-Lowry theory states, acids are the ones that can donate protons.
When a proton is donated, it is released to become medium more acidic.
HCl is a strong acid.
HCl (l) + H₂O (l) → H₃O⁺ (aq) + Cl⁻(aq)
These always reffers to strong acid where the dissociation is 100% completed.
In a weak acid, dissociation is not 100% complete, that's why we have an equilibrium.
HA (l) + H₂O (l) ⇄ H₃O⁺ (aq) + A⁻(aq) Ka
Which element has 47 protons?silver
Answers
Answer:
The answer is Silver
Numbers of Protons in Silver: The element Silver (Symbol Ag) has the Atomic Number of 47. Any atom that contains exactly 47 protons in its nucleus is an atom of silver.
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sam is trying to mix up some chemicals all the chemicals are in a flask and all he needs to do is shake them up prior to shaking the flask the chemicals weighed 300g how much will it weigh when he is done shaking the flash
Answers
It should still weigh 300g.
Explanation:
If I'm right, the Law of Conservation of Mass simply means the weight of whatever goes in will be the same when it comes out.
HELP PLEASE!!! i really need help to solve this:(
Answers
\(\\ \sf\longmapsto F_{net}=5N-5N+10N-10N\)
\(\\ \sf\longmapsto F_{net}=0+0=0N\)
No force appliedThe object will not change the position .
No directionBalanced forceif 50.0 ml of 0.100 m naoh is added to the tablet, how many ml of the hcl (molarity found in question 1) will be required to react with the excess naoh
Answers
25.0 mL of HCl is required to react with the excess NaOH.
The number of mL of HCl required to react with the excess NaOH can be determined using the equation
M1V1 = M2V2,
where M1 is the molarity of NaOH, V1 is the volume of NaOH, M2 is the molarity of HCl, and V2 is the volume of HCl. First, we need to find the moles of NaOH using the given molarity and volume:
Moles of NaOH = M1V1 = (0.100 M)(50.0 mL) = 5.00 x 10^-3 moles NaOH
Next, we use the balanced chemical equation for the reaction between NaOH and HCl to determine the moles of HCl required to react with the excess NaOH:
NaOH + HCl → NaCl + H2O
According to the balanced equation, 1 mole of NaOH reacts with 1 mole of HCl. Therefore, the moles of HCl required to react with the excess NaOH is also 5.00 x 10^-3 moles HCl.
Finally, we use the equation M1V1 = M2V2 to find the volume of HCl required:
Moles of HCl = M2V2
5.00 x 10^-3 moles HCl = (M2)(V2)
V2 = (5.00 x 10^-3 moles HCl) / M2
If the molarity of HCl found in question 1 is 0.200 M, then:
V2 = (5.00 x 10^-3 moles HCl) / (0.200 M)
V2 = 25.0 mL HCl
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A population of Esherichia coli is given time to grow for eight generations. The final population is 1,996,800 cells. What was the initial population in cells?
Answers
Answer:
7800 cells
Explanation:
The number of Escherichia coli cells N after n generations is given by
N = 2ⁿ × N₀ where N₀ = initial population
Now making N₀ subject of the formula, we have
N₀ = N/2ⁿ
Since n = 8 and N = 1,996,800 cells, substituting the values of the variables into the equation, we have
N₀ = N/2ⁿ
N₀ = 1,996,800 cells/2⁸
N₀ = 1,996,800 cells/256
N₀ = 7800 cells
So, the initial population of Escherichia coli cells is 7800 cells.
Which of the following is true of a buffered solution? Group of answer choices All of these are true The solution resists any change in its [H+]. The pH of the solution will not change much even if a concentrated acid is added. Any H+ ions added will react with a conjugate base of a weak acid already in thye solution. The pH of the solution will not change much even if a strong base is added.
Answers
Answer:
All of these are true
Explanation:
A buffer solution in chemistry is a solution that resists changes in pH when an acid or base is added to it. It is a solution that contains a weak acid and its conjugate base (anion) or a weak base and its conjugate acid.
A buffer is able to resist a change in pH due to the conjugate base and conjugate acid of the weak acids and bases contained in them respectively. The conjugate base/acid are present in an equilibrium quantity with their acid/base counterparts and help to neutralize or react with any additional H+ or OH- from an acid or base added to their solution.
However, when a strong acid or base is added to the buffer solution, there is only a slight change which practically does not change the pH of the solution.
Hence, all of the above options about a buffered solution is true.
On seeing the given options, it is clear that all the options are correct.
What is a buffer?A solution, which resists the change in pH upon the supplementation of an acidic or basic components is known as a buffer.
The following are the characteristics of buffer:
It exhibits a definite pH and it sustains it, that is, it prevents the change in pH or hydrogen ion change. A very slight modification in pH takes place at the time of the addition of small concentration of concentrated base or acid. When a small concentration of strong acid is added to the buffer solution, then the concentration of hydrogen ions enhances in the solution and will react with the conjugate base of the weak acid to maintain the concentration of hydrogen ion in the weak acid-salt buffer solution. When a small concentration of strong base is supplemented to a weak acid-salt buffer then hydrogen ions reacts with the hydroxide ions to produce neutral water and to sustain the equilibrium as per the principle of Le-Cha-telier, the dissociation of weak acid takes place in order to sustain the concentration of hydrogen ions in the buffer solution and thus pH is maintained.Thus, all the given statements are true.
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What is the distance traversed by the particle between 0 seconds and 6 seconds
Answers
The distance travelled by the particle between 0 seconds and 6 seconds is 12 m
What is velocity?Velocity is simply defined as the rate of change of displacement with time. Mathematically, it can be expressed as:
Velocity = displacement / time
From the question given above, the following data were obtained:
Time = 6 sVelocity = 2 m/sDisplacement =?Velocity = displacement / time
The displacement of the object between 0 and 6 s is calculated as;
2 = displacement / 6
Cross multiply
Displacement = 2 × 6
Displacement = 12 m
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