It is important to know the different apparatus in the laboratory and how to do it because these apparatus are handled carefully, and the experiment is done very carefully to avoid any mistakes.
What is a laboratory?A laboratory is a place where all scientific apparatus and instruments are put and experiments are done. These places are kept safe and hygienic and all experiment is done precisely to get results.
Thus, knowing the various lab equipment and how to utilize it is crucial because errors might happen during experiments because of how carefully this equipment must be handled.
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Suppose you are trying to find the volume of a box based on the given measurements for the length, width, and height of the box, where the height was measured in two parts. length, 1 = 2.20 in width, w = 3.71 in height, h = 10.4 in + 1 in Calculate the height, h, of the box, first keeping all digits, then rounding to the proper number of significant figures. unrounded h= 11.4 in V = rounded h = Calculate the volume (V) of the box using V = 1 · w. h. Round to the proper number of significant figures. . in ³ 11 in
The Volume of the box is 93.0 in³ to three significant figures.
What is the volume of the box?The volume of the box is the amount of space that the box contains or occupies.
The volume of the box is determined using the following formula:
Volume of box = length * width * height
The length of the box, l = 2.20 in
The width of the box, w = 3.71 in
The height of the box, h = 10.4 in + 1 in
The height of the box, h = 11.4 in
Volume of the box = 2.20 * 3.71 * 11.4 in³
Volume of the box = 93.0 in³
In conclusion, the volume of the box is calculated from the product of the height and width and length of the box.
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What volume of a 0.35 M NaCl solution would contain 23.0 grams of NaCl?
With 25 grams of sodium chloride, 1.2 liters of a 0.35 M solution of sodium chloride may be created.
The quantity of solute dissolved in one liter of solution is known as molarity (M).
Molarity (M) is defined as the number of moles of a solute divided by the volume of the solution in litres.
M = n / v where
M stands for molarity, n for moles, and V for volume of solution.
NaCl's molar mass is 23 g/mol plus 35.5 g/mol.
= 58.5 g/mol
Now,
Given mass/molar mass equals the number of moles (n).
= 0.427
We must now determine the solution's volume.
M = 0.35 = 0.427 / v
V is 1.2 liters
Thus, 25 grams of sodium chloride might be used to create 1.2 liters of sodium chloride solution at 0.35M.
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A chemist wants to make 5,748 mL of a solution with a concentration of 2.55 M.
How many liters of a 10.40 M solution should be used to make this solution?
1409.36ml
chemist wants to make 5,748 mL of a solution with a concentration of 2.55 M. How many liters of a 10.40 M solution should be used to make this solution
from the above statement, we have got
[tex]M_1[/tex]= 2.55 M. [tex]M_2[/tex]=10.40 M
[tex]V_1[/tex]= 5,748 mL [tex]V_2[/tex]=?
now, from the formula,
[tex]M_1V_1=M_2V_2[/tex], In this M is molarity and V is Volume
now put the values in the equation,
2.55×5748=10.40×[tex]v_2[/tex]
[tex]V_2[/tex] = 2.55×5748÷10.40
[tex]V_2[/tex]= 14,657.4÷10.40
[tex]V_2[/tex]=1409.36ml
.The number of moles of solute dissolved in one liter of solution is known as the molarity, which is the concentration of a solution. it's unit is mole per litre. it is temperature dependent concentration.
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Chloroform has a density of 1.48 g/mL. What is the
mass of 0.503 L of chloroform in g? Round your final
answer to the ones place.
Answer: 744 g
Explanation:
1 L=1000 ml
1.48 g/ml=
1.48*1000 g/L=1480 g/L
1480 g/L * 0.503 L=
744.44=744 g
A contest asks entrants to guess how many tennis balls can fit in a rectangular swimming pool that is 4 feet deep. The pool is 98 feet long and 35 feet across. Each tennis ball takes up 8 cubic inches of space. Which of the following would make the best scale model of the pool?
So the total volume is 1035 cubic meters. A tennis ball, according to the International Tennis Federation (ITF), has the official diameter of 6.54–6.86 cm.
What is International Tennis Federation?The International Tennis Federation (ITF) is the organization in charge of wheelchair tennis, beach tennis, and international tennis. The International Lawn Tennis Federation was established in 1913 by twelve national tennis associations. The ITF has 211 national associations and six regional associations as of 2016.
The ITF's governance duties include upholding and implementing tennis regulations, overseeing global team events, marketing the game, and protecting the integrity of the sport through anti-doping and anti-corruption initiatives. The Women's Tennis Association (WTA) and the Association of Tennis Professionals (ATP) are partners with the ITF in governing professional tennis.
The ITF coordinates annual team tournaments for men's (Davis Cup), women's (Billie Jean King Cup), and mixed teams (Hopman Cup) as well as the Grand Slam events.
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A sample of seawater from a tidal estuary was found to contain a concentration of 825 mg of chloride ion per kg of seawater. If the density of the sample was 1.035 g/mL, what is the molarity of the chloride ion?
The molarity of the chloride ion in the sea water is 0.024 M
We'll begin by obtaining the volume of the sea water. This can be obtained as follow:
Mass of water = 1 Kg = 1000 gDensity = 1.035 g/mLVolume of water = ?Density = mass / volume
Thus,
Volume = mass / density
Volume of water = 1000 / 1.035
Volume of water = 966.18 mL
Next, we shall determine the mole of the chloride ion. This is illustrated below:
Mass of chloride ion = 825 mg = 825 / 1000 = 0.825 gMolar mass of chloride ion = 35.5 g/molMole of chloride ion =?Mole = mass / molar mass
Mole of chloride ion = 0.825 / 35.5
Mole of chloride ion = 0.0232 mole
How to determine the molarityMole of chloride ion = 0.0232 moleVolume = 966.18 mL = 966.18 / 1000 = 0.96618 LMolarity = ?Molarity = mole / volume
Molarity = 0.0232 / 0.96618
Molarity = 0.024 M
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How many moles of chlorine gas at 120.0°C and 26.1 bar would occupy a vessel of 18.5 L? R = 0.08314 L･bar/mol･K.
PV= nRT, The total number of moles of chlorine gas are 140.09.
What is the mole?
PV= nRT,
T = 120 C = 120 + 273= 393 K
R = 0.08314 L . bar/ mol
P= 26.1 bar
The volume of the vessel= 18.5 L.
PV= nRT, on substituting the value of
26.1 * 18.5 = n * 0.08314 * 393 K
482.85= n* 3.24
482.85/ 3.24= n
149.0 =n
Therefore, PV= nRT, The total number of moles of chlorine gas are 140.09.
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1.) How many atoms are in 6.72 x 10^4 moles of silver?
Answer:
How many atoms are in a mole of silver?
From Avogadro's number, we know that one mole of silver atoms is equal to 6.02 times 10 to the 23rd silver atoms
Explanation:
According to the article, elements are named by the number of protons in the nuclei.
Which paragraph BEST supports the idea outlined above?
A
The periodic table is getting a little bit longer, thanks to the addition of four super-heavy elements.
B
The discoveries of elements 113, 115, 117 and 118 were confirmed recently by the International Union of Pure and Applied Chemistry. The group vets the man-made elements seeking a permanent spot on the periodic table, a chart listing all the elements that hangs in science classrooms around the world.
C
Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus.
D
The new elements are known as super-heavy elements. Element 118, for example, is the heaviest element to date, with 118 protons alongside 176 neutrons.
The correct answer is: Atoms are the building blocks that make up elements. At the center of each atom is a nucleus composed of small particles called protons and neutrons. Nuclei is the plural of nucleus; option C.
What is atomic number of an element?The atomic number of an element is the number of protons present in the nucleus of the atom of the element.
The nucleus is the center of the atom and is the heaviest part of the atom.
Another sub-atomic particle fund in the nucleus is the neutron.
Elements are named according to the number of protons in the nuclei.. This is because the number of protons in the nucleus of any given atom whereas the neutron number may vary, Also, electrons are easily removed from atoms of elements.
In conclusion, the number of protos in atom is used to name the atom.
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Specify the formal charges (both sign and magnitude) on the atoms labeled a-c.
The formal charges that the atoms bear in the compounds are;
1)
a - zero
b - plus half
c- zero
2)
a - zero
b - zero
c - plus one
What is the formal charge?The formal charge has to do with the charge that an atom appears to have in a compound. We could often decode the formal charge that compound might posses just by an intent look at the compound.
We know that the outermost shell of all the atoms in a compound ought to have eight electrons. This implies that all the atoms of elements in a compound must obey the octet rule. The atoms that do not obey the octet rule must bear a formal charge.
The formal charges that the atoms bear in the compounds are;
1)
a - zero
b - plus half
c- zero
2)
a - zero
b - zero
c - plus one
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Calculate the mass of camphor (C₁0H₁60) that contains a billion (1.0 × 10°) carbon atoms.
Be sure your answer has a unit symbol if necessary, and round it to 2 significant digits.
Mass of camphor is 252.47 g and mass is a measure of the amount of matter in a substance or an object
Camphor, an organic compound of penetrating, somewhat musty aroma, used for many centuries as a component of incense and as a medicinal. Modern uses of camphor have been as a plasticizer for cellulose nitrate and as an insect repellent, particularly for moths and the molecular formula is C₁₀H₁₆O
Here given data is camphor (C₁₀H₁₆0) that contains a billion (1.0 × 10°) carbon atoms
So, 1.0×10⁰ carbon atom×1 molecule of camphor/1 carbon atom
1 molecule of camphor×1 mole of camphor/Avogadro's number
1 molecule of camphor×1 mole of camphor/6.06×10²³ molecule
= 1.661 mole of camphor
1.661 mole of camphor ×152 g camphor = 252.47 g camphor
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which reaction condition can't be used for the following transformation
The reaction condition making use of hydrazine (NH₂-NH₂) and hydroxyl ions cannot be used for the mentioned transformation.
Which catalysts are used for conversion of nitro compound to aniline?
Catalysts used for the reduction of nitro compound to aniline are palladium catalysts ,although iron and nickel along with HCl can also be used as they all belong to d-block of the periodic table, which are well-known for their properties to be used as a catalyst.
Hydrazine cannot be used as a catalyst for the conversion of nitro compound to aniline as it is expensive as well as poisonous. Catalysts which are to be used for such conversions must be cost effective and safe to handle.
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What are chemical changes that take place in the creation of a s’more
Answer:
The marshmallow goes through a chemical change called combustion
Explanation:
Dont know if this helps but
chemical fomular of the compound formed between boron and oxygen
The compound formed is Boric/Boron Oxide B2O3
One of the boron oxides is boron oxide. It has the chemical formula B2O3 and is white, glassy, and solid. It usually always exists in the vitreous (amorphous) form, but with sufficient annealing, it can crystallize. One of the most challenging chemicals to crystallize is this one. Boron oxide is a highly insoluble, thermally stable source of the element that can be used in ceramic, glass, and optical applications.
Oxide compounds are not electrically conductive. Some perovskite structured oxides, on the other hand, are electronically conductive and find use as the cathode in solid oxide fuel cells and oxygen production systems. They are mixtures with at least one metallic cation and one oxygen anion. reactions.
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A 132.0 g sample of a nonvolatile compound was dissolved in 4.300 mol of cyclohexane (P° = 100.0 mmHg). The vapor pressure of the solution was determined to be 85.00 mmHg. What is the molar mass of the compound?
The molar mass of the compound is 336.36mol
Molar mass defined as the mass of a sample of that compound divided by the amount of substance
Here given data is mass of sample = 132.0 g
Mass of nonvolatile compound = 4.300 mol = 4.300 mol ×84.16g = 361.88g
Vapor pressure of the solution = 85.00 mmHg
We have to find molar mass of compound = ?
Then we have formula is p⁰-p/p⁰ = W₂M₁/W₁M₂ where,
M2 = molar mass of sample
W1 = molar mass of compound
W2 = weight of compound
Then, 84.00-85.00/84.00 = 361.88×361.88/132.0
M2 = 361.88×361.88×84/132.0
M2 = 336.36mol
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chemistry problem
help!!!!!
Answer:
1+1=2
Explanation:
A liquid solvent is added to a flask containing an insoluble solid. The total volume of the solid and liquid together is 86.0 mL.
The liquid solvent has a mass of 26.0 g and a density of 0.865 g/mL. Determine the mass of the solid given its density is
2.75 g/mL.
Answer:
it's 50.11 trust me I know thank you
According to Le Châtelier’s principle, does the equilibrium
shift in the direction of products or reactants when N2
is
added to the equilibrium mixture of each of the following
reactions? 110.52
a. 2NH31g2 hv 3H21g2 + N21g2
b. N21g2 + O21g2 hv 2NO1g2
c. 2NO21g2 hv N21g2 + 2O21g2
d. 4NH31g2 + 3O21g2 hv 2N21g2 + 6H2O1g2
According to Le Châtelier’s principle or reactions in chemical equilibrium;
2 NH₃ (g) → 3 H₂ (g) + N₂(g) : addition of N₂ shifts equilibrium to the left
N₂ (g) + O₂(g) → 2 NO (g) : addition of N₂ shifts equilibrium to the right
2 NO (g) → N₂ (g) + O₂ : addition of N₂ shifts equilibrium to the left
4 NH₃ (g) + 3 O₂ (g) → 2 N₂ (g) + 6 H₂O (g) : addition of N₂ shifts equilibrium to the left
What is equilibrium in a chemical reaction?Equilibrium in a chemical reaction refers to the point in a chemical reaction in which the rate of the formation of product from the reactants or the forward reaction is equal to the rate of formation of reactants from products or the backward reaction.
For equilibrium to be achieved in a chemical reaction the reaction must occur in a closed or isolated system.
The condition that occur in a reaction in equilibrium are described by Le Châtelier’s principle which states that for a reaction in equilibrium, the equilibrium position will shift to annul any constraint or change imposed on the system.
Considering the given reactions:
2 NH₃ (g) → 3 H₂ (g) + N₂(g) : addition of N₂ shifts equilibrium to the left
N₂ (g) + O₂(g) → 2 NO (g) : addition of N₂ shifts equilibrium to the right
2 NO (g) → N₂ (g) + O₂ : addition of N₂ shifts equilibrium to the left
4 NH₃ (g) + 3 O₂ (g) → 2 N₂ (g) + 6 H₂O (g) : addition of N₂ shifts equilibrium to the left
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Why does the ducks have flat beaks ?why does the ducks have flat beaks ?
When 96.0 g of calcium and 41.7 g of nitrogen gas undergo a reaction that has a 86.7% yield, what mass of calcium nitride forms?
g calcium nitride
Taking into account definition of percent yield, the mass of calcium nitride formed is 102.614 grams.
Reaction stoichiometryIn first place, the balanced reaction is:
3 Ca + N₂ → Ca₃N₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Ca: 3 molesN₂: 1 moleCa₃N₂: 1 moleThe molar mass of the compounds is:
Ca: 40.08 g/moleN₂: 28 g/moleCa₃N₂: 148.24 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Ca: 3 moles ×40.08 g/mole= 120.24 gramsN₂: 1 mole ×28 g/mole= 28 gramsCa₃N₂: 1 mole ×148.24 g/mole= 148.24 gramsLimiting reagentThe limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction.
Limiting reagent in this caseTo determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 28 grams of N₂ reacts with 120.24 grams of Ca, 41.7 grams of N₂ reacts with how much mass of Ca?
mass of Ca= (41.7 grams of N₂× 120.24 grams of Ca) ÷28 grams of N₂
mass of Ca= 179.07 grams
But 179.07 grams of Ca are not available, 96 grams are available. Since you have less mass than you need to react with 41.7 grams of N₂, Ca will be the limiting reagent.
Mass of Ca₃N₂ formedConsidering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 120.24 grams of Ca form 148.24 grams of Ca₃N₂, 96 grams of Ca form how much mass of Ca₃N₂?
mass of Ca₃N₂= (96 grams of Ca× 148.24 grams of Ca₃N₂)÷ 120.24 grams of Ca
mass of Ca₃N₂= 118.355 grams
Then, 118.355 grams of Ca₃N₂ can be produced from 96.0 g of calcium and 41.7 g of nitrogen gas.
Percent yieldThe percent yield is the ratio of the actual return to the theoretical return expressed as a percentage and it is calculated as the experimental yield divided by the theoretical yield multiplied by 100%:
percent yield= (actual yield÷ theoretical yield)×100%
where the theoretical yield is the amount of product acquired through the complete conversion of all reagents in the final product.
Mass of calciumn nitride formedIn this case, you know:
percent yield= 86.7%actual yield= ?theorical yield= 118.355 gramsReplacing in the definition of percent yields:
86.7%= (actual yield÷ 118.355 grams)×100%
Solving:
86.7%÷ 100%= actual yield÷ 118.355 grams
0.867= actual yield÷ 118.355 grams
0.867× 118.355 grams= actual yield
102.614 grams= actual yield
Finally, the mass of calcium nitride formed is 102.614 grams.
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Which properties cause chemical reactions?
Answer:
reactivity, flammability and the ability to rust
Explanation:
reactivity is the ability of matter to react chemically with other substances
flammability is the ability of matter to burn
What does direct and inverse relationship mean
Direct relationship- ???
Inverse relationship-???
Direct relationship means increase in one variable leads to increase in other variable and vice-versa. inverse relationship means increase in one variable leads to decrease in other variable.
Direct relation defined as when both the variables decreases together or both the variables increases together.
On graph , let one variable is x and other is y , So x increases when y increases or x decreases when y decreases. direct relationship on graph has positive slope.
Mathematically expressed as y = kx ( k is constant)
Inverse relationship defines as when one variable increases while other decrease or when one variable decreases while other increases. inverse relationship has negative slope on graph.
Mathematically expressed as y = k/x
Thus,Direct relationship means increase in one variable leads to increase in other variable and vice-versa. inverse relationship means increase in one variable increases it leads to decrease in other variable.
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How many moles of iron(III) oxide will be produced from 30.2 g of oxygen reacting with excess iron?
(Balanced Equation): 4Fe + 3O2 —> 2Fe2O3
Answer:
3 mol
Explanation:
According to the balanced chemical equation, on the macroscopic scale, 1 mol of Fe2O3 F e 2 O 3 reacts with 3 mol of CO .
Calculate the formula mass of the molecule from its structure.
formula mass: __________ amu
The molecular formula of the given structure is C₁₀H₁₃N₅O₄ and its formula mass is 267 amu.
A molecule's formula mass (also known as formula weight) is the sum of the atomic weights of the atoms in the compound's empirical formula. The formula mass is expressed in atomic mass units (amu).
From the structure of the molecule, we can easily identify the molecular formula of the structure:
Therefore, the molecular formula of the given structure is C₁₀H₁₃N₅O₄.
Now,
Mass of Carbon = 12.011 u
= 10 × 12.011 u
= 120.11 u
Mass of Hydrogen = 1.00784 u
= 13 × 1.00784 u
= 13.10192 u
Mass of Nitrogen = 14.0067 u
= 5 × 14.0067 u
= 70.0335 u
Mass of Oxygen = 15.999 u
= 4 × 15.999 u
= 63.996 u
Formula mass of C₁₀H₁₃N₅O₄ = 120.11 + 13.10192 + 70.0335 + 63.996
= 267.24142 u
Thus, the formula mass of the given structure i.e., C₁₀H₁₃N₅O₄ is 267.24142 u
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Give three examples of how energy is transferred.
pls answer quick
Consider the following claim: Group behavior can increase the chances for an individual and a species to survive and reproduce.
Identify evidence from the lesson that supports this claim. Use specific examples to explain the cause-and-effect relationship between particular group behaviors and an individual’s survival. Then, identify an additional, reputable source that provides evidence to further support this claim. Use this additional evidence to draw a conclusion about the role of group behavior in individual and species’ survival. Provide a link to the source at the bottom of your response.
Group behavior is also known as collective behavior, which increases the chances of species to reproduce and survive because they rely on one another to carry out actions essential for their survival like hunting, migration, and breeding.
Ethologists claim that social organisms rely heavily on other group members to survive.
The basic example of group behavior is a school of fish. These little fish species congregate in huge groups and travel great distances in search of food. When more people joined the group, researchers from Princeton University found that their ability to maintain orientation improved, making them more receptive to their surroundings.
Moreover, there are many pieces of evidence that show orcas (killer whales), which are highly sociable animals, form big pods of 20–30 people and 'plan' their hunting techniques. Younger individuals are also taught essential hunting techniques by older females who swim with them.
Conclusion: Social organisms that travel in groups rely on all members to carry out crucial behaviors that, if they didn't, would cause a significant decline in their populations because they couldn't feed or reproduce as successfully on their own as they could with the group's "help."
The link to the source is:- Couzin, I.D. (2018) Collective animal migration, Current Biology 28(17), R976-980.
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176.5 cm to meters express your answer to four significant figures and include the appropriate units
Answer:
17,650 m
Explanation:
100 cm = 1m so, 176.5 × 100 = 17,650m
How much time did it take Little Debbie to run 15 m if she was running 3 m/s?
Time did it take a little debbie to run 15 m if she was running 3 m/s is 5 sec.
debbie running speed = 3 m/s
so,
in one meter = 1/3 sec
we have to calculate the time taken by little debbie to run 15 meters ,
therefore,
Time = distance / speed
time take by debbie to run 15 m = 15 / 3 sec
= 5 sec.
so, time taken by little dubbie to cover the distance of 15 meter is 5 sec.
Hence, Time did it take a little debbie to run 15 m if she was running 3 m/s is 5 sec.
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(01.05 LC)
Which of the following is a sign a chemical reaction has occurred? (4 points)
Select one:
O
a.A solid dissolves in a liquid.
b.A solid forms when two liquids are mixed.
c.A solid melts to a liquid when it is heated.
d.A solid metal changes shape.
(01.05 LC)
When heat energy is added, two changes are
Answer:
it is A trust me I know thank you
Consider the reaction of cesium metal with gaseous fluorine to produce cesium fluoride. How many cesium atoms are on the product side of the equation?
Based on the equation of the reaction, there are two cesium atoms on the product side of the equation.
What is the equation of the reaction between cesium and fluorine?Cesium is a metallic element that is found in the group 1A of the period table.
Cesium therefore has one valence electro which it can donate to an electronegative element to form a compound wit the element.
Fluorine belongs to the group 7A of the period table known as the halogens.
Fluorine accepts one electro from an electropositive element to form a compound with the element.
The equation of the reaction between cesium and fluorine is given below:
2 Cs + F₂ → 2 CsFThere are two cesium atoms on the product and reactant side of the equation.
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