I need some chemistry help
Thank u

I Need Some Chemistry Help Thank U

Answers

Answer 1

H2(g) + Cl2(g) = 2 HCl (g) AH-184.6 kJ where the mathematical notation for "is equivalent to" is. However, we also have a quantity called energy change in our thermochemical equation

What is a thermochemical equation mean?

Thermochemical equations are symmetric chemical equations that take into account both the energy change and the physiological state of all products and reactants. When energy is a reactant, a reaction is endothermic; whereas, when energy is a product, a reaction is exothermic.

How is a thermochemical process expressed in writing?

A balance empirical formula with its heat per reaction is known as a thermochemical equation. They appear to be equal to A+B+C+H=Xjoules. You are already proficient at creating and balancing chemical equations. Therefore, all we must do is add either H or U values.

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Related Questions

Which of these is not a property of the intracellular fluid (ICF)?The concentration of chloride ion is lower than that of interstitial fluid. The concentration of potassium ion exceeds that of sodium ion. The concentration of sodium ion exceeds that of potassium ion. The protein concentration is higher than that of interstitial fluid.

Answers

The protein concentration is higher than that of interstitial fluid. The intracellular fluid (ICF) is the fluid inside cells, and is composed of water, electrolytes, and organic molecules.

The intracellular fluid (ICF) is the fluid inside cells, and is composed of water, electrolytes, and organic molecules. Common properties of ICF include high concentrations of potassium ions and low concentrations of chloride ions compared to interstitial fluid. The protein concentration of ICF is lower than that of interstitial fluid.

The protein concentration is higher than that of interstitial fluid.

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Select the correct answer. what is the name of a system that converts thermal energy into a form of useful mechanical or electrical energy?
a. incubator
b. heat engine
c. centrifuge
d. vacuum column
e. spectrophotometer

Answers

Heat engine is a system that converts thermal energy into a form of useful mechanical or electrical energy.

In thermodynamics, the heat engine is a system which is able to convert the heat or thermal energy into mechanical or electrical energy which can be used in order to perform mechanical work. This is achieved by bringing the a particular working substance to a lower state temperature from a higher state temperature.

There are a different types of heat engines in which the Carnot engine possesses the maximum efficiency. Some examples of heat engines are firearms, thermal power station etc.

Hence, the correct option is b. heat engine.

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A student standardized a solution of NaOH and found that the concentration was 0.544 M. They then used it to titrate a monoprotic acid. If 45.50 mL of the base was used, how many moles of acid were neutralized? (Do not report your answer in scientific notation)

Answers

The number of moles of a monoprotic acid neutralized is equal to 0.025 mol.

What is a neutralization reaction?

A neutralization reaction can be defined as a reaction in which reaction of an acid and base generates salt and water. When a strong acid and a strong base react the salt can be neither acidic nor basic.

When monoprotic acid HA reacts with NaOH (a strong base), the resulting salt is NaA and water.

HA    +    NaOH   →   NaA  +   H₂O

Given, the concentration of NaOH = 0.544 M

The volume of the NaOH = 45.50 ml = 45.50 × 10⁻³

The number of moles of NaOH, n = M × V = 0.544 × 45.50 × 10⁻³ = 0.025 mol

The number of moles of HA monoprotic acid = moles of NaOH = 0.025 mol

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The pressure of hydrogen sulfide gas in a container is 35,650Pa. What is this pressure in torr (1 atm = 101,325 Pa = 760torr)?A. 46. 91 torrB. 267. 4 torrC. 351. 8 torrD. 3612torrE. 27,090 torr

Answers

In a container, the pressure of hydrogen sulfide gas is 267.4 torr.

What is pressure?

The force of all gas particle/wall collisions divided by the area of the wall is defined as pressure (P): Pressure is one of the primary observable quantities of this phase of matter; it is exerted by all gases. The amount of force exerted per area is described as pressure. Pressure is defined as force divided by area. The pressure from snow on a roof, for example, would equal the weight of the snow divided by the area of the roof. In chemistry, pressure is often generated by gases. When you blow up a balloon, you fill it with gas.

Here,

pressure of hydrogen sulfide gas= 35650 Pa

1 torr=133.33 Pa

=35650/133.33

=267.38 torr

The pressure of hydrogen sulfide gas in a container is 267.4 torr.

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How many of the carbons in the following compound are chiral center(s)? A) 0 B) 1 C) 2 D) 3 E) 4 or more

Answers

Answer:

3 (e

Explanation:

If the actual yielsd of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.

Answers

If the actual yield and percent yield are 51.4g and 77.0%, respectively, calculate the theoretical yield. We predicted a theoretical yield of 13 grams for the reaction of Na with Cl2.

Yield is determined by dividing the principal amount by the net realized return. Gains and returns on stock investments, for instance, can take one of two kinds. On the basis of the chemical equation's stoichiometry, theoretical yield is computed. Experimental data are used to determine the real yield. Calculating the ratio of actual yield to theoretical yield yields the percent yield. The % ratio of the theoretical yield to the actual yield is known as the percent yield. It is calculated as the theoretical yield multiplied by 100% divided by the experimental yield.

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how many grams of KNO3 that should be placed in the airbag to fully react with the Na.
10 Na + 2KNO3 > 1K20 + 5Na2O + 1 N2 (g)

Answers

The first time you have a chance at the top is the second one you get a free pass and you can go on your way back and then go. 10 Na+ 2kno3 is not that because of its popularity and the popularity it is a popular choice to be a member in a country that has a large number and is a member state in a world where there is a huge amount to choose between a country

What is the measurement of expired CO2 that typically provides a numeric display of the partial pressure of CO2 in torr or mmHg

Answers

The measurement of expired CO₂ that typically provides a numeric display of the partial pressure of CO₂ in torr or mmHg is the capnometry.

The capnometry measurement of the  CO₂ , carbon dioxide is the measurement in the expired air and it provides the clinician with the noninvasive measurement of systemic metabolism and the ventilation. it is used to determine the correlation in between the tidal CO₂  and the partial CO₂  in the non intubated breathless patents.

Thus, the measurement if the expired CO₂  that shows the partial pressure of the CO₂  is the capnometry.

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A(n) ____________________ has more hydrogen ions than hydroxide ions and has a pH ____________________ 7.

Answers

An acidic solution has a pH over 7 and contains more hydrogen ions than hydroxide ions. Any aqueous solution with a pH lower than 7.0 ([H+] more than 1.0 x 10-7M) is said to be acidic.

A  acidic solution that uses water as its solvent is said to be aqueous. Acidic solutions are sour in contrast to alkaline solutions, yet it's never a good idea to taste an unidentified solution. Any solution that contains more hydrogen ions per volume of solution than water is an acidic solution; contrasted with acidic solutions are basic or alkaline solutions. Atomic number 1 and the letter H stand for the chemical element hydrogen. The element hydrogen is the lightest.

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which of the following is a testable hypotheses?
O A. if I brush my teeth, I will get fewer cavities than if i don’t brush my teeth.
O B. it’s wrong not to brush your teeth before you have an important conversation with someone.
O C. Green toothpaste taste better than blue toothpaste or red toothpaste.
O D. smart, careful, healthy people always brush their teeth.

Answers

I would say C. because that’s the only one you can actually test.

Answer:

A

Explanation:

because its the only one that can be tested

How is water an exmaple of an molecule and a compound

Answers

Answer:

Water is a compound because it is made up of water molecules. There is no such thing as water atoms. Water molecules are made of hydrogen and oxygen atoms, in the definite proportion of two hydrogens for one oxygen.

Explanation:

The difference between a molecule and a compound is this:

A molecule consists of two or more atoms joined by a chemical bond.

A compound consists of two or more different atoms joined by chemical bonds.

Water (H2O) is both a molecule and a compound.

Hydrogen gas (H2) and oxygen gas (O2) are molecules but because the atoms of which they are made are not different, they do not qualify as compounds.

How many times more acidic is a solution with a pH of 2 compared with one with a pH of 5 Explain.

Answers

Using a logarithmic scale with 7 as neutral, lower values are more acidic and higher values are more alkaline, the acidity or alkalinity of a solution is expressed. where c is the number of moles of hydrogen ions present per litre. So pH 2 is 1000 times stronger than pH 5, and vice versa.

A pH of 2 is how much more acidic than a pH of 5.

For instance, a pH of 2 is 10,000 times more acidic than a pH of 3 and a pH of 5 is 10,000 times more acidic. Ten times as alkaline as a pH of 10 is a pH of 11.

How many times more acidic is a pH 2 solution compared to a pH 9 solution?

Each whole pH value is ten times more acidic than the next higher value since the pH scale is logarithmic.

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There are 4 wavelengths that are emitted from a Hydrogen atom that can be seen by the human eye. Two of the wavelengths are the same color. What colors are they

Answers

Answer:

a) red, blue, and violet

b) orange, yellow, and green

C) red, orange, and yellow

D) blue, indigo, and violet​

PLS HELP ASAP PLSSSS

Answers

i think a because the percentages are different

A compound is found to contain 59.94 % carbon, 13.44 % hydrogen, and 26.62 % oxygen by mass. What is the empirical formula for this compound

Answers

The empirical formula for this compound containing 59.94 % carbon, 13.44 % hydrogen, and 26.62 % oxygen by mass is C3H8CO.

Given the % of carbon = 59.94%

The % of hydrogen = 13.44%

The % of oxygen = 26.62%

If a percentage is provided, we will assume that the entire mass is 100 grams. As a result, each element's mass is equal to the percentage indicated. Then

the mass of carbon (m1) = 59.94g

The mass of hydrogen (m2) = 13.44g

The mass of oxygen (m3) = 26.62g

We know the molar mass of C = 12 g/mole

The Molar mass of H = 1 g/mole

The Molar mass of O = 16 g/mole

The moles of carbon = 59.94/12 = 4.995

The moles of hydrogen = 13.44/1 = 13.44

The moles of oxygen = 26.62/16 = 1.664

Divide each mole value by the lowest computed mole number to get the mole ratio.

For C = 4.995/1.664 = 3 , For H = 13.44/1.664 = 8 and For O = 1.664/1.664 = 1. Then the empirical formula = C3H8CO

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How many moles of MgCO3 are present in 252. 939 grams of MgCO37

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Answers

The number of moles of MgCO3 that is present in the given mass of magnesium carbonate is 2.99 moles.

The number of moles can be defined as the ratio of given mass over molar mass. The chemical that is given is magnesium carbonate having molar mass of 84.314 g/mol and the given mass of the same is 252.939 grams.

The formula for number of moles that is 'n' can be given as follows:

n= m/M where m is the given mass and M is the molar mass.

Substituting the values,

n= 252.939 grams /84.314 grams/mol

n=2.99 moles

Therefore, the number of moles of MgCO3 is 2.99 moles.

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Select the correct answer. which gas is the most abundant greenhouse gas?
a. ozone
b. chlorofluorocarbon
c. carbon dioxide
d. methane
e. water vapor

Answers

E) The most significant and prevalent greenhouse gas is water vapor. Ozone, carbon dioxide, methane, nitrous oxide, and other gases are also present.

Which major source of greenhouse gases is it?

Over the past 150 years, almost all of the rise in atmospheric greenhouse gases has been caused by human activities. Burning fossil fuels for transportation, electricity, and heating is the primary human activity in the United States that contributes to the emission of greenhouse gases.

Which four greenhouse gases have the greatest impact?

The greenhouse gases on Earth warm the planet by storing heat in the atmosphere. Carbon dioxide, methane, nitrous oxide, and water vapor—all of which are found naturally—as well as fluorinated gases—which are made—are the main gases that cause the greenhouse effect.

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Which one of the following statements is not correct about MSDS?


Select one:


a.

It does not contain information on physical and chemical properties of the material, potential hazards of the material and how to work safely with these materials.



b.

It provides single reference for all information about hazardous chemicals.



c.

Material Safety Data sheet forms the important elements of effective Chemical Hazards Communication System.



d.

It is a document prepared by the manufacturers/suppliers of the chemical

Answers

Option B. It provides a single reference for all information about hazardous chemicals.

MSDS does not provide a single reference for all information about hazardous chemicals, but it does provide information on physical and chemical properties, potential hazards, and safe work practices.

Understanding the Role of MSDS in Chemical Hazard Communication

The Material Safety Data Sheet (MSDS) is a document prepared by the manufacturer or supplier of a hazardous chemical which provides information about the physical and chemical properties of the hazardous chemical, potential hazards associated with it, and how to work safely with it. The MSDS is an important element of an effective chemical hazard communication system as it provides information on how to identify and protect against potential health hazards, proper storage and handling procedures, and proper disposal methods.

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Darwin observed how farmers and breeders produced many kinds of farm animals and plants. These plants and animals had traits that were desired by the farmers and breeders. He also noticed how the study of similar body structures and vestigial organs could add to the evidence of evolution. After performing several breeding experiments, he came to certain conclusions and formulated some theories. His theory of evolution and natural selection is the most accepted one.

What is the reason behind the acceptance of Darwin's theory?
Responses
A It is based on the practical example of Lamarck’s theoryIt is based on the practical example of Lamarck’s theory
B It is supported by its harmonizing with other views.It is supported by its harmonizing with other views.
C It is based on the ideas of earlier hypothesis and laws.It is based on the ideas of earlier hypothesis and laws.
D It is supported by practical evidence and examples.

Answers

The reason behind the acceptance of Darwin's theory is D It is supported by practical evidence and examples.

What is the theory of evolution proposed by Charles Darwin?

The theory of evolution proposed by Charles Darwin is a well sustained model that explains how animals change in order to adapt to an ever-changing enviroment, which is supported by scientific evidence and observations.

Therefore, with this data, we can see that the theory of evolution proposed by Charles Darwin is well sustained by evidence obtained from experimentation and also observations of the natural world.

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Identify the phrases that generally apply to molecular compounds. A. Contains metals and nonmetals B. Are often fades or liquids C. Have low melting points D. Contain ionic bonds E. Use covalent bonding

Answers

Answer is option C) Have low melting points.

Explanation:

As is common knowledge, small molecules make up molecular compounds, and these small molecules are held together by an intermolecular force. The intermolecular tensions in this situation are incredibly weak and simple to overcome when breaking it. Therefore, molecular compounds have low melting and boiling points because of weak intermolecular interactions.

What are molecular compounds?

Chemical substances known as molecular compounds assume the shape of distinct molecules. Examples include common substances like carbon dioxide and water. These substances differ significantly from ionic substances like sodium chloride. When metal atoms give up one or more of their electrons to nonmetal atoms, ionic compounds are created. The resultant cations and anions are drawn to one another electrostatically.

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What is the evidence for Darwin's theory of evolution?

Answers

The evidence for Darwin's theory of evolution is the consistency of the sequence of fossils from early to recent.

Changing populations and species of organisms are at the heart of biological evolution. The British naturalist Charles Darwin is most likely the first individual that comes to mind today when we discuss evolution. The biological evolution via natural selection theory was put out by British biologist Charles Darwin. Darwin believed that species change over time, give rise to new species, and descended from a single ancestor through the process of evolution. Charles Darwin's theory of evolution is known as natural selection. Animals with heritable qualities that aid in survival and reproduction will often generate more offspring than their contemporaries due to the limited resources in nature, increasing the frequency of such traits through subsequent generations.Populations change throughout time through natural selection, becoming increasingly adapted to their surroundings. Natural selection is reliant on the environment and necessitates the presence of heritable variation within a population.

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How many moles of H3PO4 form from 9 mol P4O10

Answers

According to the given chemical equation and stoichiometry of it , 36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.

What is stoichiometry?

It is the determination of proportions of elements or compounds in a chemical reaction. The related relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

As per the reaction, 1 mole of P₄O₁₀ produces 4 moles of  H₃PO₄, thus 9 moles of  P₄O₁₀ will produce 9×4=36 moles of H₃PO₄.

Thus,36 moles of H₃PO₄ are formed from 9 moles of P₄O₁₀.

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Answer:36

Explanation:

taking the class just got it right

Which supports the idea that conservation of mass is a scientific law instead of a hypothesis?

A- It is an educated guess.

B- It has been tested and supported once or twice.

C- It has been examined, tested and supported over centuries.

D- It has been tested many times and sometimes is true and sometimes isn’t.

Answers

Answer:

C- It has been examined, tested and supported over centuries.

Explanation:

The conservation of mass is a scientific law that states that matter cannot be created or destroyed, only transformed from one form to another. This law has been extensively tested and supported over centuries of scientific investigation, and it is considered to be a fundamental principle of chemistry and physics.

If there are 6 atoms of hydrogen on the products side, how many molecules of H2 are on the reactants side?

Answers

If there are 6 atoms of hydrogen on the products side, then there would be 6 atoms of hydrogen also on the reactants side. That would be 3 molecules of [tex]H_2[/tex].

Law of conservation of atoms

According to the law of conservation of atoms or matter, atoms can neither be destroyed nor created during the course of chemical reactions. However, atoms can change forms during reactions.

Going by this law, it means the number of atoms of a particular element must remain constant before and after chemical reactions. Otherwise, we will say the chemical equation of such reactions are not balanced.

Thus, if there are 6 atoms of hydrogen on the products side of a reaction, 6 atoms of hydrogen must also be on the reactants side of the reaction. A molecule of hydrogen, [tex]H_2[/tex], has 2 atoms of hydrogen. This means 3 molecules of hydrogen must be on the reactants side in order to have a total of 6 hydrogen atoms.

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Write a introduction base on the topic reproduction, male an female reproduction system​

Answers

The ma le repr0 ductive system includes made up of internal organs such as the prostate gland, vas deferens, as well as ure thra as well as external geni talia like the pe nis, tes tes, as well as scrot um.

The health of something like the male reproductive system and the hormo nes secreted by the brain determine a man's fertility as well as sexual characteristics.

The human reproductive system would be the organ system primarily charged of creating and fertilizing gametes (eggs but rather sperm) as well as carrying a fetus. The gonads of both se xes create gametes.

The ov aries, fallopian tubes, uterus, cervix, as well as vagina are all parts of the female repro ductive system. It comprises the pe nis, prostate, as well as tes tes in men.

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How many mole is 1g?

Answers

One gram of a chemical is equivalent to one mole.

A physical characteristic called the molar mass is calculated by dividing the mass of a given substance by the substance's volume. The standard relative atomic mass of an element is multiplied by the molar mass constant, 1 × 10⁻³ kg/mol = 1 g/mol, to determine the molar mass of its atoms. A compound's molar mass is calculated by adding the standard atomic weights of the constituent atoms and multiplying the result by the molar mass constant.

One atom or molecule has the same mass in grams as one mole of a substance does in atomic mass units.

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Mg + _________HCI →
_____ H₂ + _____ MgCh

Answers

Mg + 2HCl → H2 + MgCl2 because The reaction between magnesium and hydrochloric acid produces hydrogen gas and magnesium chloride.

What is molecule?

Molecules are the smallest unit of a chemical compound that can exist independently and remain unchanged in chemical composition. A molecule is composed of two or more atoms that are chemically bonded together. A molecule can be made up of different elements, such as carbon, hydrogen, oxygen, and nitrogen, and can be composed of a variety of combinations of these elements. Molecules are essential components of all living things, as they are important for basic functions such as energy transfer, metabolism, and cell structure.

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An oxide of chromium crystallizes with the following unit cell (chromium = gray; oxygen = red)(Figure 1) .
What is the formula of the oxide?

Answers

An oxide of chromium crystallizes with the following unit cell (chromium = gray; oxygen = red)(Figure 1) --CrO3

In order to determine the formula of the oxide, we need to determine the ratio of chromium to oxygen atoms in the unit cell. From the provided unit cell, we can see that there is one chromium atom (gray) in the center of the unit cell, and four oxygen atoms (red) surrounding it. This gives us a ratio of 1:4 chromium to oxygen, which simplifies to a ratio of 1:4 or 1/5. Therefore, the formula of the oxide is CrO4.An oxide is a chemical compound that contains at least one oxygen atom and one other element. Oxides can be either inorganic or organic, depending on the element that is combined with oxygen. Inorganic oxides are compounds composed of a metal and oxygen. They can be further classified as acidic, basic or neutral depending on the oxidation state of the metal atom. Examples of inorganic oxides include water (H2O), carbon dioxide (CO2), sulfur dioxide (SO2), and nitrogen dioxide (NO2)

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Why are all the elements in group 18 relatively unreactive meaning they do not gain lose or share electrons with other atoms?

Answers

Elements of group 18 belongs to the family of noble gases with a general electronic configuration ns²np⁶,  where the valence shell is completely filled.

The elements of group 18 are considered to be noble because they have a completely filled valence shell due to which they donot have the tendency to gain, lose or share their valence electrons with other atoms. Thus, they are highly unreactive.

The elements belonging to noble gas family are:  Helium (He), Neon (Ne), Argon(Ar), Krypton(Kr), Xenon(Xe), Radon(Rn).

under conditions of standard pressure and temperature, these elements exists as gases with very low chemical reactivity so they are known as inert gases.

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15.0 L of an ideal gas at 298 K and 3.36 bar are heated to 350 K with a new pressure of 4.90 atm. What is the new volume in litres

Answers

The new volume in litres is 13.29 L.

Given,

Temperature 1 (T₁) = 298 K

Volume 1 (V₁) = 15 L

Temperature 2 (T₂) = 383 K

Pressure 1 (P₁) = 3.36 atm

Pressure 2 (P₂) = 4. atm

By Ideal Gas Equation,

P₁V₁/T₁ = P₂V₂/T₂

⇒ (3.36*15)/298 = (4.90*V₂)/383

⇒50.4/298 = 4.90V₂/383

⇒ (50.4*383) / (298*4.90) = V₂

⇒ 19303.2/1460.2 = V₂

⇒13.29 L = V₂

New Volume will be 13.29 L.

Ideal gas law is a precise approximation of the behavioral of several gases under various situations in thermodynamics. The Ideal Gas Equation is a mathematical formula that combines empirical laws such as Charle's law, Boyle's law, Gay-law, Lussac's and Avogadro's law.

The equation characterizing the states of hypothetical gases stated mathematically by combinations of empirical or physical constants is known as the Ideal Gas Equation. It's also known as the universal gas equation. It is defined as follows:

"The ideal gas law seems to be the equation of state for a fictitious perfect gas. It is a decent approximation of the behavioral of various gases under numerous situations, while it has significant limitations".

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