Answer:
[tex]\boxed{\sf no.\ of \ molecules = 7.13 \times 10^{22} \ molecules}[/tex]
Explanation:
Given data::Mass in g = m = 5.68 g
Molar mass = M = (16)3 = 48 g/mol
Avogadro's number = [tex]N_A[/tex] = 6.023 × 10²³
Required:No. of molecules = ?
Formula:[tex]\displaystyle no.\ of \ molecules = \frac{m}{M} \times N_A[/tex]
Solution:Put the givens in the above formula
[tex]\displaystyle no. \ of \ molecules =\frac{5.68}{48} \times 6.023 \times 10^{23}\\\\no. \ of\ molecules = 0.12 \times 6.023 \times 10^{23}\\\\no. \ of \ molecules = 0.713\times 10^{23}\\\\no.\ of \ molecules = 7.13 \times 10^{22} \ molecules\\\\\rule[225]{225}{2}[/tex]
Determine what type of compound is shown below:
A. Metallic
B. Electrostatic
C. Ionic
D. Polar
Answer:
Polar
Explanation:
Methanol is not electrostatic
It's not metallic as it has no metals in it
It's not ionic as coordinate bonding is made.
It's polar as a lone pair is present over OH-
Need help, I'm kinda panicking!
Answer:
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The equilibrium constant for the following equation:
PCl5(g) <--> PCl3(g) + Cl2(g) is 1.05 at 250 degrees Celsius. If the equilibrium partial pressures of PCl5 and PCl3 are 0.875 atm and 0.463 atm respectively, what is the equilibrium partial pressure of Cl2?
Group of answer choices
A. 1.05 atm
B. 1.98 atm
C. 0.463 atm
D. 0.054 atm
From the calculation, the partial pressure of Cl2 is 1.98 atm. Option B
What is the equilibrium constant?The term equilibrium constant refers to the value that shows us the extent to which reactants are converted into products. We know that the equilibrium constant can only be obtained by the use of the equilibrium partial pressures of each of the species.
Thus we have;
K = p PCl3 . pCl2/pPCl5
p PCl3 = partial pressure of PCl3
pCl2 = partial pressure of Cl2
pPCl5 = partial pressure of PCl5
K = equilibrium constant
Substituting values;
1.05 = 0.463 * pCl2/0.875
pCl2 = 1.05 * 0.875/0.463
pCl2 = 1.98 atm
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The equilibrium constant for the following reaction:
Ca(HCO3)2(s) <--> CaO(s) + 2 CO2(g) + H2O(g)
would be:
Group of answer choices
A. K = [Ca(HCO3)2] / [CaO][CO2]2[H2O]
B. K = [CaO][CO2]2[H2O] / [Ca(HCO3)2]
C. K = [CO2]2[H2O]
D. K = [CO2]2[H2O] / [Ca(HCO3)2]
Answer:
C.) [tex]K = {[CO_{2} ]^{2} [H_2O] }[/tex]
Explanation:
The general equilibrium expression looks like this:
[tex]K = \frac{[B]^b[C]^{c} [D]^{d} }{[A]^{a}} }[/tex]
In this expression,
-----> K = equilibrium constant
-----> uppercase letters = formulas
-----> lowercase letters = balanced equation coefficients
Solids are not included in the expression, so Ca(HCO₃)₂(s) and CaO(s) should be left out. The products should be in the numerator and the reactants are in the denominator. This makes the expression:
[tex]K = \frac{[B]^b[C]^{c} [D]^{d} }{[A]^{a}} }[/tex] <----- Equilibrium expression
[tex]K = {[CO_{2} ]^{c} [H_2O]^{d} }[/tex] <----- Insert gaseous formulas
[tex]K = {[CO_{2} ]^{2} [H_2O] }[/tex] <----- Insert coefficients
Arrange the events In the Ilfe of a star In the correct order.
The events in the life of a star in the correct order is as follows: F, B, C, D, E and A.
What is the life of a star?The life of a star refers to the the events that occur in a star from when it formed newly until when it finally dies off.
When stars are newly formed, they are formed from star dust, and when just before they die, the form supernovas.
The several events in the life of a star can be arranged thus:
The temperature increases in the center of a nebula, and nuclei begin to fuse.As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.The star stays in the main sequence stage for a long time.The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.Heavy elements are created when the supernova explodes.All that remains of the star now is the core. In some cases, the star turns into a black holeIn conclusion, the life of a star is the period of its formation to its burning out or death.
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Note that the complete question is given below:
Arrange the events in the life of a star in the correct order.
A. All that remains of the star now is the core. In some cases, the star turns into a black hole
B. As the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.
C. The star stays in the main sequence stage for a long time.
D. The star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.
E. Heavy elements are created when the supernova explodes.
F. The temperature increases in the center of a nebula, and nuclei begin to fuse.
The _____ is the attraction of the electrons of one atom to the protons of the other atom, leading to a bond.
a. oxidation reaction
b.electron orbital
c.gravitational pull
d.electrostatic force
Answer:
d
Explanation:
The + charge of the proton and the - charge of the electron create a electrostic force of attraction ( opposites attract)
If the pressure of 1.5 moles of a gas is 2 atm and the temperature is 27°C, what is the volume of the gas?
Group of answer choices
A. 9.25 L
B. 5.0 L
C. 37.0 L
D. 18.5 L
Answer:
9.25l
Explanation:
9.25l was correct answer
The ideal gas law is a fundamental equation that describes the behavior of an ideal gas. It relates the pressure (P), volume (V), temperature (T), and number of moles (n) of an ideal gas using the ideal gas constant (R). The volume of the gas is 18.5 L. Hence option D is correct.
We can use the ideal gas law to solve this problem:
PV = nRT
where:
P is the pressure of the gas (in atm)
V is the volume of the gas (in L)
n is the number of moles of the gas
R is the ideal gas constant (0.08206 L·atm/mol·K)
T is the temperature of the gas (in K)
Plugging in the values from the problem, we get:
2 atm * V = 1.5 mol * 0.08206 L·atm/mol·K * 300 K
V = (1.5 mol * 0.08206 L·atm/mol·K * 300 K) / 2 atm
V = 18.5 L
Therefore, the volume of the gas is 18.5 (option D).
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12.2 g of N₂ gas at 1132 torr and 91°C has a volume of
Answer:
8.73 L
Explanation:
First, you need to convert grams to moles using the molar mass.
Molar Mass (N₂): 2(14.009 g/mol)
Molar Mass (N₂): 28.018 g/mol
12.2 grams N₂ 1 mole
---------------------- x ------------------------ = 0.435 moles N₂
28.018 grams
To find the volume, you need to use the Ideal Gas Law:
PV = nRT
In this equation,
-----> P = pressure (torr)
-----> V = volume (L)
-----> n = moles
-----> R = Ideal Gas constant (62.36 torr*L/mol*K)
-----> T = temperature (K)
After converting the temperature from Celsius to Kelvin, you can plug the given values into the equation.
P = 1132 torr R = 62.36 torr*L/mol*K
V = ? L T = 91 °C + 273.15 = 364.15 K
n = 0.435 moles
PV = nRT
(1132 torr)V = (0.435 moles)(62.36 torr*L/mol*K)(364.15 K)
(1132 torr)V = 9888.015
V = 8.73 L
if .709 j of heat is added to water and cause the temperature to go up by .036 degrees C what mass of water is present
Answer:
0.00471 grams H₂O
Explanation:
To determine the mass, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = energy/heat (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = temperature change (°C)
The specific heat capacity of water is 4182 J/g°C. You can plug the given values into the equation and simplify to isolate "c".
Q = 0.709 J c = 4182 J/g°C
m = ? g ΔT = 0.036 °C
Q = mcΔT <----- Equation
0.709 J = m(4182 J/g°C)(0.036 °C) <----- Insert values
0.709 J = m(150.552) <----- Multiply 4182 and 0.036
0.00471 = m <----- Divide both sides by 150.552
How many isomers does propane have?
01
02
03
05
Answer:
A.) 1
Explanation:
Propane only exists in one conformation. It does not have enough carbons to form branches, and there are only hydrogens attached to each carbon. Furthermore, there is no way to twist the carbon or change its orientation (ex. cis- and trans-) to result in a different structure of propane. There is no other way to represent the molecule without drawing a different molecule.
Which of the following sets of elements could replace the generic "X" symbol with their own to produce a valid dot notation for the element(s)?
Select one:
a.
carbon, silicon, and germanium
b.
oxygen, sulfur, and selenium
c.
boron, aluminum, and gallium
d.
nitrogen, phosphorus and arseni
Answer:
a
Explanation:
Because of their valence electron
Carbon, Silicon and germanium has 4 as their valence electron
Nitrogen, phosphorus, and arsenic can replace the generic "X" symbol as they have five valence electrons in their outer shell.
What is a dot notation?A Lewis electron-dot symbol or dot notation is a way of representing the valence electrons of an atom using dots around the symbol of the element. The dots are equivalent to the valence electrons in an atom These dots are arranged on the left and right and above and below the symbol No more than two dots are arranged on a sideWhat are the valence electrons?Valence electrons are the electrons that are positioned in the outermost shell of an atomThey are the farthest from the nucleus and hence least tightly held electrons by the nucleusValence electrons of an atom participate in the bond and reaction and hence, they determine the reactivity of an element.Thus, nitrogen, phosphorus, and arsenic replace the X symbol as they 5 valence electrons in their outermost shell and produce a valid dot notation.
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: Which of the following sets of elements could replace the generic "X" symbol with their own to produce a valid dot notation for the element(s)?
Select one:
a. carbon, silicon, and germanium
b. oxygen, sulfur, and selenium
c. boron, aluminum, and gallium
d. nitrogen, phosphorus, and arsenic
How much heat is needed to melt 10.0 grams of ice at -10°C until it is water at 10°C?
Group of answer choices
A. +83.6 J
B. +3963 J
C. -3963 J
D. -83.6 J
The heat needed to melt 10.0 grams of ice at -10°C until it is water at 10°C is 3,969.5 J. (approx= 3963J).
What is Sensible heat?Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state.
Q= c×m×∆T
What is Latent heat?Latent heat is defined as the energy required by a quantity of substance to change state.
When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.
In this case, the heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to
Q= m×L
Where,
L is the latent heat
-10°C to 0 °CC= specific heat capacity of ice= 2.108 J/gK
M= 10 g
ΔT= T(final)– T(initial) = 0 °C – (-10 °C)= 10 °C= 10 K
Sensitive heat Q(1) = 2.108×10×10
= 210.8J
Heat needed to melt iceThe specific heat of melting of ice is 334 J/g, the heat needed to melt 10 grams of ice is
Q(2) = 10× 334
= 3340J
0°C to 10 °CC= specific heat capacity of liquid water is 4.187 J/gK
M= 10 g
ΔT= T(final) – T(initial) = 10 °C – 0 °C= 10 °C= 10 K because being a temperature difference, the difference is the same in °C and K.
Q(3) = 4.187×10×10
= 418.7 J.
Total heat required= Q1 + Q2 + Q3
Total heat required= 210.8 J + 3,340 J + 418.7 J
= 3969.5J
Thus, the heat needed to melt 10 gram of ice from temperature-10°C to 10°C is 3969.5. Therefore, option B is correct option.
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Machines have moving parts and electronics that can overheat in some situations. Engineers use metal heat sinks to help the heat escape from the machine. A heat sink is made of metal and usually has fins, which give the heat sink a large surface area. Why is it important for heat sinks to be made of metal and have a large surface area?
Answer:
to reduce friction and increase efficiency of the machime
Answer:
to reduce friction and increase efficiency of the machime
Explanation:
Round to 3 significant figures 78.6500
Answer:
78.7
Explanation:
The number has 4 significant figures: 7,8 6 and 5.
To round off to 3 significant figures, the target digit is the third significant figure in the number.The determining digit is the fourth significant figure in the number; it is 5 hence the target digit will go up by 1 and any digits to the right of it will be rounded down to 0.
Jon's equation ____ support his claim that matter is conserved during the chemical reaction because the reactants contain ____ ___ atom(s) compared to the products and the reactants contain ____ atom(s) compared to the products.
Answer:doesn't one more. chlorine. one fewer. hydrogen
Explanation:
Jon's equation does support his claim that matter is conserved during the chemical reaction because the reactants contain the same number of atoms compared to the products.
In a balanced chemical equation, the total number of atoms of each element in the reactants must be equal to the total number of atoms of the same element in the products.
This is known as the law of conservation of mass, which states that matter cannot be created or destroyed during a chemical reaction.
As long as the equation is balanced, showing the same number of atoms on both sides, it confirms that matter is conserved throughout the reaction, supporting Jon's claim.
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Convert the following measurement
Answer:
9.9 x 10^-2 g*cm²/s²
Explanation:
9.9 × 10^-9 kg*m²/s² = g*cm²/s²
1 kg*m²/s² = 1 joule(s)
1 g*cm²/s² = 1 erg(s)
britannica
1 kg = 1000g = 1x10^3 g
1 m²= 10000 cm² = 1x10^4 cm²
add the exponents 3 and 4 which = 7
-9 + 7 = -2
9.9 × 10^-9 kg*m²/s² = 9.9 x 10^-2 g*cm²/s²
Given the following reaction:
2 HCl(aq) + Mg(s) <--> MgCl2(aq) + H2(g) + heat
When the temperature is decreased what changes occur?
Group of answer choices
A. In order to restore equilibrium, the reaction shifts right, towards reactants.
B. In order to restore equilbrium, the reaction shifts left, towards products.
C. In order to restore equilibrium, the reaction shifts left, towards reactants.
D. In order to restore equilibrium, the reaction shifts right, towards products.
Answer:D. In order to restore equilibrium, the reaction shifts right, towards products
Explanation:
3. Consider the following
energy levels of a hypothetical atom:
E4_-1.0 x 10-19.
-5.0 x 10-19 J
-10 x 10--193
E1
.-15 x 10-19
(a) What is the wavelength of the photon needed to excite an electron from E1 to E4? (b)
What is the energy (in joules) a photon must have in order to excite an
electron from
E2
to E3? (c) When an electron drops from E3 level to the E1, the atom is said tO undergo
emission. Calculate the wavelength of the photon emitted in this process.
a)λ = 1.43 x 10⁻⁷ m, b)λ =5 x 10⁻¹⁹ and, c)λ = 1.99 x 10⁻⁷ m.
What is an atom?A chemical element is uniquely defined by its atoms, which are tiny pieces of substance. A core nucleus, often surrounded by one or more electrons, makes up an atom. The charge of every electron is negative. The positively charged nucleus has one or more protons and neutrons, relatively heavy particles.An atom is referred to any elementary particle of matter with at least one proton. Examples of atoms are neon (N) and hydrogen (H) (Ne).Protons, which have a positive charge, and neutrons, which have no charge, make up its structure. All regular, naturally occurring atoms contain the long-lived particles protons, neutrons, and the electrons that orbit them.It is difficult to appreciate how little they are until you see how many atoms there are in your body. Around 7 octillion atoms make up one adult.a) The wavelength of the photon needed to excite an electron from E1 to E4:
ΔE = hc/λ
(-1 + 15) x 10⁻¹⁹ = 6.63 x 10⁻³⁴ x 3 x 10⁸ / λ
λ = 1.43 x 10⁻⁷ m
b) The energy (in joules) a photon must have in order to excite an electron from E2:
= (-5 + 10) x 10⁻¹⁹
λ = 5 x 10⁻¹⁹
c) An electron drops the E3 level to the E1 level, and the atom is said to undergo emission:
Change in energy = 10 x 10⁻¹⁹ J
10 x 10⁻¹⁹ = 6.63 x 10⁻³⁴ x 3 x 10⁸ / λ
λ = 1.99 x 10⁻⁷ m
The wavelength of the photon needed to excite an electron from E1 to E4 is 1.43 x 10⁻⁷ m.
The energy (in joules) a photon must have in order to excite an electron from E2 is 5 x 10⁻¹⁹.
An electron drops the E3 level to the E1 level, and the atom is said to undergo emission is 1.99 x 10⁻⁷ m.
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If you do a lab that burns Magnesium in pure Oxygen what would the empirical formula of the compound be if you started with 0.6 g Magnesium and 0.4 g of Oxygen?
Group of answer choices
A. Mg2O2
B. Mg2O3
C. Mg3O2
D. MgO
Answer:
Empirical Formula = MgO
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Explanation:
Elements = Mg O
Mass/ 0.6g/ 0.4g/
RAM 24 16
= 0.025 0.025
Divide by
the smallest = 0.025/ 0.025/
value. 0.025 0.025
Mole ratio = 1 : 1
Empirical Formula = MgO
Given the following equation:
Mg(OH)2 + 2HCI --> MgCl2 + 2H₂O
How many moles of water form from one gram of magnesium hydroxide?
26
58
0.03
116
Question 5 (1 noint)
:
Answer:
0.084 moles of H₂O
Explanation:
RAM of Mg = 24, of H = 1, of O = 16
Mg(OH)₂ + 2HCI --> MgCl2 + 2H₂O
Mole of Mg(OH)₂ = mass/MolarMass
= 1/24 = 0.042mol
From the equation,
1 mole of Mg(OH)₂ = 2 moles of H₂O
0.042mol of Mg(OH)₂ = 2 × 0.042 of H₂O
= 0.084 moles of H₂O
Once balanced, what is the coefficient of HCl in the following reaction:
Mg + HCl → MgCl2 + H2
Group of answer choices
A. 1
B. 2
C. 0
D. 3
Answer:
B. 2
I hope this helps.
Explanation:
Mg + 2HCl → MgCl2 + H2
The pressure on 20 mL of a gas at constant temperature is changed from 4.0 atm to 2.0 atm. What is the new volume?
Answer:
40 ml
Explanation:
boyles law
Pi Vi = PƒVƒ
4 * 20 = 2 * Vƒ
40 ml = Vƒ
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20.0g of H2(g) and 32g of O2(g) are reacted produce H2O(l). The amount of hydrogen left behind after completion of reaction is?
Answer:
8 moles = 16 gm of H2 left over
Explanation:
The balanced equation is
2 H2 + O2 ===> 2 H2 O
20 g H2 = 20 g / 2 gm/mole = 10 moles of H2
32 g O2 = 32g / 32 g / mole = 1 mole O2
From the balanced equation, you can see each 2 moles of H2 requires 1 Mole of O2
you would need 20 moles of O 2 to react withe the 10 moles of H2
but you only have 1 mole of O2 so 8 moles of H2 will be left
Which of the following elements has the largest atomic radius?
Group of answer choices
A. Iron
B. Cobalt
C. Chromium
D. Calcium
The answer is calcium.
Calcium has the largest atomic radius.
If the temperature of a gas increased from 100 K to 200 K and the volume of a gas decreased from 20 L to 10 L, what is the new pressure if the original pressure was 100 kPa?
Group of answer choices
A. 100 kPa
B. 400 kPa
C. 200 kPa
D. 50 kPa
Answer:
B. 400 kPa
Explanation:
the pressure increases, when the temperature increases. and it increases, when the volume decreases.
both cases happen here, each with the factor 2.
so, the pressure increases by the factor 2×2 = 4.
4×100 = 400 kPa
What is included in the study of chemistry?
Select one:
a.
composition and interaction of matter
b.
motion and forces
c.
the economics of manufacturing
d.
forces and technology
Explanation:
composition and interaction of matter included in the study of chemestry
If a chemical is oxidized it is also known as the
Group of answer choices
A. the one that is reduced
B. the product
C. oxidizing agent
D. reducing agent
Answer:
D.) reducing agent
Explanation:
Oxidized chemicals gain electrons. In order to gain these electrons, another chemical must lose electrons. So, the chemical (which will be oxidized) acts as a reducing agent, causing the other chemical to be reduced and lose electrons.
Which metal will spontaneously react with Zn²⁺(aq), but will not
spontaneously react with Mg²⁺ (aq)?
Mn(s) metal will spontaneously react with Zn²⁺(aq), but will not
spontaneously react with Mg²⁺ (aq)
The Eo value of an electrochemical cell determines its spontaneity. Positive Eo electrochemical cells are spontaneous, and vice versa.
The relevant Eo of the half-cell in this instance are as follows for Mn(s) metal
Zn2+/Zn = -0.763v for Eo
2.37v for Eo Mg2+/Mg.
Mn2+/Mn = -1.18v for Eo.
Consequently, the equation for an Eo cell (with Zn as one of the half-cells) is: Eo Zn2+/Zn - Eo Mn2+/Mn = -0.763 - (-1.18) = 0.417v.
On the other hand, the equation for an Eo cell (with Mg as one of the half-cells) is: Eo Mg2+/Zn - Eo Mn2+/Mn = -2.37 - (-1.18) = -1.19v.
As a result, Mn(s) metal will spontaneously react with Zn2+(aq), but not with Mg2+ (aq)
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A sample of carbon dioxide occupies 200 L at 22°C and 1.0 atm. At what temperature will
it expand to 1000 L at 0.90 atm?
Answer:
1328 K or 1055 °C
Explanation:
To find the new temperature, you need to use the Combined Gas Law:
P₁V₁ / T₁ = P₂V₂ / T₂
In this equation, "P₁", "V₁", and "T₁" represent the initial pressure, volume, and temperature. "P₂", "V₂", and "T₂" represent the final pressure, volume, and temperature. After converting the temperature (T₁) from Celsius to Kelvin, you can plug the values into the equation and simplify.
P₁ = 1.0 atm P₂ = 0.90 atm
V₁ = 200 L V₂ = 1000 L
T₁ = 22 °C + 273.15 = 295.15 K T₂ = ? K
P₁V₁ / T₁ = P₂V₂ / T₂
(1.0 atm)(200 L) / 295.15 K = (0.90 atm)(1000 L) / T₂
0.6776 = (0.90 atm)(1000 L) / T₂
(0.6776) x T₂ = (0.90 atm)(1000 L)
(0.6776) x T₂ = 900
T₂ = 1328 K
T₂ = 1055 °C
If the mass of the sun is 2x, at least one planet will fall into the habitable zone if I place a planet in orbits___, ____, ____, and ____, and all planets will orbit the sun successfully.
If the mass of the sun is 2x, at least one planet will fall into the habitable zone. if I place a planet in orbits 84, 1, and 5, and all planets will orbit the sun successfully.
Mass of the sun and motion of planetsThe size of the sun and motion of planets around it is illustrated below;
When the mass of the sun is 1xIf the mass of the sun is 1x, at least one planet will fall into the habitable zone. if I place a planet in orbits 2, 6, and 75, and all planets will orbit the sun successfully.
When the mass of the sun is 2xIf the mass of the sun is 2x, at least one planet will fall into the habitable zone. if I place a planet in orbits 84, 1, and 5, and all planets will orbit the sun successfully.
When the mass of the sun is 3xIf the mass of the sun is 3x, at least one planet will fall into the habitable zone if I place a planet in orbits 672, and 7 and all planets will orbit the sun successfully.
Thus, If the mass of the sun is 2x, at least one planet will fall into the habitable zone. if I place a planet in orbits 84, 1, and 5, and all planets will orbit the sun successfully.
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