The height of water in a water barometer is 883 cm at 20˚c. The density of water at 20˚c is 0. 998 g•cm-3. What is the pressure?.

By ideal gas approximation, the molar mass is 9.84 x 10¯³.

We need to know about the ideal gas theory to solve this problem. The ideal gas is assumed that there is no interaction between particles in a gas. It can be determined by the equation

P . V = n . R . T

where P is pressure, V is volume, n is the number of moles gas, R is the ideal gas constant (8.31 J/mol.K) and T is temperature.

From the question above, we know that

ρ = 0.862 g/l

T = 298 K

P = 2.14 atm = 216835.5 Pa

Find the molarity of gas

P . V = n . R . T

P / (R. T) = (n/V)

M = P / (R. T)

M = 216835.5  / (8.31 . 298)

M = 87.56 M

Find the molar mass

M = (gr/Mr) / lt

M = (gr/lt) x 1/Mr

M =  ρ / Mr

87.56 = 0.862 / Mr

Mr = 9.84 x 10¯³

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A0 is the initial activity, AT is the activity at time T, and H is the half-life, expressed in units of T, where AT = A0 e(-T/H).

What we know when we replace it produces...

0.71 = (1) e(-T/5730)

Calculate T: loge(0.71) = -T/5730

T = -loge(0.71) (5730)

For all aboriginal charcoal,

T = 1962 (conservatively rounded to T = 2000).

0.28 = (1) e(-T/5730)

Find T by solving for loge(0.28) = -T/5730.

T = -loge(0.28) (5730)

For a mayan headdress,

T = 7294 (conservatively rounded, T = 7000) 0.89 = (1) e(-T/5730)

Calculate T by using loge(0.89) = -T/5730.

T = -loge(0.89) (5730)

T = 667 for neanderthals

(roughly rounded to T = 700). 0.05 = (1) e(-T/5730)

Find T by solving loge(0.05) = -T/5730.

T = -loge(0.05) (5730)

(Conservatively rounded, T = 17000; T = 17165)

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One kilogram over 1000 grams is the valid conversion factor. So the correct option is D.

Unit conversion is the expression of the same feature in a different unit of measurement. Time, for example, can be stated in minutes rather than hours, and distance can be translated from miles to kilometers, feet, or any other length measurement.

Measurements are frequently stated in one set of units, such as feet, but need alternative units, such as chains. A conversion factor is a numerical equation that allows for the equal exchange of feet and chains.

The AA conversion factor is a number that is used to multiply or divide one set of units into another. When converting to an equivalent value, the proper conversion factor must be utilized. To convert inches to feet, for example, the suitable conversion value is 12 inches equal to 1 foot. The suitable conversion value for minutes to hours is 60 minutes = 1 hour.

Therefore, the correct option is D.

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Answer:

one kilogram over 1,000 grams

Explanation:

I got it right on the test.

The presence or absence of double bonds between the carbon atom and other atoms determines whether a carbon atom's covalent bonds to other atoms are in a tetrahedral configuration or a planar configuration.

The condition of electronic configuration is the one that determines the kinds as well as the number of bonds that a carbon atom will form with other atoms. When two carbon atoms are bonded by a double bond, the particular atom which is joined to the carbon exists in the same plane as the place of carbons. The organic molecules called hydrocarbons consists of only hydrogen and carbon.

Because reason of having four electrons by carbon in its valence shell, it is capable of forming four covalent bonds with that of other atoms. Whenever carbon forms four bonds with other atoms, the resulting molecule thus formed has a shape of tetrahedral. Generally, there are three basic types of covalent bonds which include single bonds, double bonds as well as triple bonds.

A carbon atom's covalent bonds to other atoms are in a planar configuration with the presence or absence of double bonds.

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Answer:

Metallic character of the element

Explanation:

The second law of thermodynamics states that energy conversions result in energy lost in a nonuseful form like heat.

The second law of thermodynamics states that although heat can do work, it is not always possible to convert heat completely into other types of energy, because in an energy conversion process an amount of energy is useful and other one is not useful due to  the fact that it cannot be transformed.

In general terms, the second law of thermodynamics speaks of the efficiency in the processes of energy conversion and entropy in systems.

Entropy is defined as the degree or amount of disorder or randomness of a system.  

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b.selling print copies of a book after purchasing the digital file

Aloha, I'm here to help you today! <3

Answer:

Option. A  Producing and selling a drug that another company invented

Explanation:

Hope this helps you! <3

Have an Awesome day! :P

Aperture controls the amount of light that passes though the lens of the camera.

The parameter known as aperture determines how much the lens's diaphragm opens to let light enter the camera. In other words, it regulates the amount of light that reaches the sensor or film as well as the size of the opening in the diaphragm. Different lenses have different minimum and maximum values for the aperture.

The ISO, the Aperture, and the Shutter Speed are the three different ways you can regulate how much light your camera captures. The ISO can be compared to your film stock. If you had the good fortune to shoot film, you would be aware that a lower ISO produces clearer images and requires less light.

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Answer:

I hope this helps.

Explanation:

All but one of the halides will produce a precipitate with Silver.

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The proof of a 750-ml bottle of rum is 74.

In the US, alcohol proof is equal to twice the percent of alcohol (ethanol) by volume, so for example, 180 proof alcohol is a 90% ethanol solution by volume.

d = 0.785 g/ml; density of the solution

n(ethanol) = 4.73 mol; amount of the alcohol

m(ethanol) = 4.73 mol × 46 g/mol

m(ethanol) = 217.58 g; mass of ethanol

V(ethanol) = 217.58 g ÷ 0.785 g/mol

V(ethanol) = 277.17 ml; volume of ethanol

%v/v = 277.17 ml ÷ 750 ml × 100%

%v/v = 37%; the percent of alcohol (ethanol) by volume

the proof = 37 × 2 = 74

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There were many scientific discoveries led to the revision of mendeleev's periodic table.

There were mamy anomalies in Mendeleev's periodic table which were later revised according to the new discoveries.

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Thermal energy transfers occur in three ways: through conduction, convection, and radiation. When thermal energy is transferred between neighboring molecules that are in contact with one another, this is called conduction.

Answer: All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample). Chemical properties describe the characteristic ability of a substance to react to form new substances; they include its flammability and susceptibility to corrosion. All samples of a pure substance have the same chemical and physical properties. For example, pure copper is always a reddish-brown solid (a physical property) and always dissolves in dilute nitric acid to produce a blue solution and a brown gas (a chemical property).

Physical properties can be extensive or intensive. Extensive properties vary with the amount of the substance and include mass, weight, and volume. Intensive properties, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity, and physical state at a given temperature. For example, elemental sulfur is a yellow crystalline solid that does not conduct electricity and has a melting point of 115.2 °C, no matter what amount is examined (Figure 1.3.1). Scientists commonly measure intensive properties to determine a substance’s identity, whereas extensive properties convey information about the amount of the substance in a sample.

All matter has physical and chemical properties. Physical properties are characteristics that scientists can measure without changing the composition of the sample under study, such as mass, color, and volume (the amount of space occupied by a sample). Chemical properties describe the characteristic ability of a substance to react to form new substances; they include its flammability and susceptibility to corrosion. All samples of a pure substance have the same chemical and physical properties. For example, pure copper is always a reddish-brown solid (a physical property) and always dissolves in dilute nitric acid to produce a blue solution and a brown gas (a chemical property).

Physical properties can be extensive or intensive. Extensive properties vary with the amount of the substance and include mass, weight, and volume. Intensive properties, in contrast, do not depend on the amount of the substance; they include color, melting point, boiling point, electrical conductivity, and physical state at a given temperature. For example, elemental sulfur is a yellow crystalline solid that does not conduct electricity and has a melting point of 115.2 °C, no matter what amount is examined (Figure 1.3.1). Scientists commonly measure intensive properties to determine a substance’s identity, whereas extensive properties convey information about the amount of the substance in a sample.

Explanation: Read the article and simplify it in your own words.

in order for the wooden to waft in fuel, it needs to have a density much less than the density of fuel and so as for it to sink in ethanol, it must have a greater density than the density of ethanol however ethanol is denser than gasoline therefore if it sinks in ethanol it has to also sink in fuel.

If the wood pressure is much less than the object's weight, the object will sink. So, the piece of timber floats in water whilst located in ethanol it sinks. ethanol is lighter than water so it needs to drift to the floor of the water but this isn't always the actual case. The ethanol in water neither sinks nor floats, alternatively it mixes thoroughly to form a homogenous solution. The purpose of this blending of two solutions is hydrogen bonding between ethanol and water.

Density is a measure of how heavy something is compared to its size. If an item is greater dense than water it will sink while placed in water, and if it's miles much less dense than water it'll float. Density is a functioning asset of a substance and doesn't depend on the amount of substance.

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Answer:

Explanation:

bdbdh

Answer:

it would represent sodium

Explanation:

distance of the star ....

Answer:

number of electrons in the star

98.684 ml of 95% ethanol solution and 26.316 ml of water are required to prepare 125 ml of 75% ethanol solution.

What is a solution?

A solution is a uniform mixture of two or more components with particles smaller than one nanometer.

There are many different types of solutions, such as soda water, salt-and-sugar solutions, and others. In a solution, each component appears as a separate phase. The distribution of the particles is uniform, or there is particle homogeneity. This explains why the full contents of a soft drink bottle have the same flavour.

Let x ml of the 95% ethanol solution be the volume.

According to the law of conservation of mass, the amount of ethanol in x millilitres of 95% ethanol solution is equivalent to the amount in 125 millilitres of 75% ethanol solution.

⟹M1 V1 =M 2 V 2

In this instance: M 1 = 0.95, V 1 = x ml, M 2 = 0.75, V 2 = 125 ml, and V 1 = 98.684 ml.

But [V 2] = 125 ml for the ultimate volume.

Therefore, 98.684 ml of 95% ethanol solution and 26.316 ml of water are required to prepare 125 ml of 75% ethanol solution.

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To make 1 L of citrate buffer (pH 3.0 to 6.2), follow these instructions

A. 800 mL of distilled water should be ready in a convenient container.

B. Add the solution with 25.703 g of sodium citrate dihydrate.

C. Add 2.421 g of citric acid in the mixture.

D. Use HCl or NaOH to adjust the solution's pH to the appropriate level.

E. Add distilled water until there is 1 L in the container.

What is a buffer?

Buffer solution refers to a solution whose pH is not significantly changed by the addition of modest amounts of either an acid or a basic. The solution of reserve acidity or alkalinity that resists pH change upon the addition of a modest amount of acid or alkali is known as a buffer.

Use these directions to create 1 L of citrate buffer (pH 3.0 to 6.2).

A handy container with 800 mL of distilled water should be prepared.

B. Include the sodium citrate dihydrate solution, which contains 25.703 g.

C. Include the mixture with 2.421 g of citric acid.

D. To bring the pH of the solution to the proper range, use HCl or NaOH.

E. Fill the container with distilled water until it measures 1 L.

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AgCN will precipitate first.

Precipitation in chemistry is the formation of an insoluble chemical by the reaction of two salts or through temperature changes that affect the solubility of the compound. Additionally, the solid that results from a precipitation reaction is referred to as "precipitate."

Precipitation can be a sign that a chemical reaction has taken place, but it can also happen when the concentration of a solute is higher than its solubility. The process of small, insoluble particles aggregating with one another or forming an interface with a surface, such as a container wall or a seed crystal, is the precursor to precipitation and is known as nucleation.

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Answer:

Point A, Point B, and Point C

Explanation:

Collinear points means that they share the same line. Points A, B, and C all share the line m.

34g Al(HCO3)3 gives 34/210 moles = 0.1619 moles

0.1619 moles Al(HCO3)3 has 3*0.1619 = 0.4857 moles  HCO3-

0.1619 moles Al(HCO3)3 has 0.1619 moles aluminium ions

0.1619 moles Al(HCO3)3 has 9*0.1619 moles oxygen = 1.4571 moles oxygen

what are moles?

In chemistry, a mole, sometimes spelled mol, is a common scientific measurement unit for significant amounts of very small objects like atoms, molecules, or other predetermined particles. The mole designates 6.02214076 10 23 units, which is a very huge number.

Aluminium bicarbonate has a formula of Al(HCO3)3 and it molecular weight is 210g.

1 mole HCO3- weighs 61 g

1 mole Al(HCO3)3 has 3 moles of  HCO3-

210 g Al(HCO3)3  gives 1 mole

Thus, 34g Al(HCO3)3 gives 34/210 moles = 0.1619 moles

1 mole HCO3- weighs 61 g

1 mole Al(HCO3)3 has 3 moles of  HCO3-

0.1619 moles Al(HCO3)3 has 3*0.1619 = 0.4857 moles  HCO3-

0.1619 moles Al(HCO3)3 has 0.1619 moles aluminium ions

0.1619 moles Al(HCO3)3 has 9*0.1619 moles oxygen = 1.4571 moles oxygen

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Two hydrogen and one oxygen atoms combine to form two hydrogen molecules, or 2H₂O.

The process of evaporation never stops. Water bodies continuously lose water, which builds up in the atmosphere as water vapors.

Later, these vapors precipitate back into water and reach the earth as rain or snow. Hydrogen bonds form between nearby hydrogen and oxygen atoms of adjacent water molecules in the case of water. A bond called a hydrogen bond is produced by the attraction between individual water molecules. A structure made up of two or more atoms that are chemically connected to one another is called a molecule. A compound or elemental molecule could be the structure. An elemental molecule, like ozone (O₃) or chlorine, only contains one type of atom (Cl₂). One or more distinct components combine to form a composite molecule.

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Answer: 2 Just to clarify

Explanation:

Answer:

32.06 amu

Explanation:

(31.972 amu  x 95%) + (32.971 amu x 0.76%) + (33.967 amu x 4.22%) =

(31.972 x .95) + (32.971 x .0076) + (33.967 x .0422) =

30.3734 + .2505796 + 1.4334074 = 32.057387 = 32.06 amu

The unknown element is Sulfur.

0.925 moles aluminium chloride can be prepared with excess chlorine and 25g Al, Al being the limiting element.

What is limiting reagent?

As soon as the first reagent in a reaction is completely used, no other reactions can take place. The material that has been completely consumed when a specific chemical reaction is complete is the limiting reagent, sometimes referred to as the limiting reactant.

Molecular weight of AlCl3 that is aluminum chloride  = 133g

Thus, for one mole of AlCl3 27 g Al is require and 3*35.5g of cl is required.

Now we have only 25 g of Al and excess Cl, thus Al becomes the limiting reagent here,

hence, 1 mole Al = 27 g

25 g Al = 25/27 moles Al = 0.925 mole Al

Thus, 0.925 moles aluminium chloride can be prepared with excess chlorine and 25g Al, Al being the limiting element.

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These are  stereoisomers so option b.

constitutional isomers are structural isomers who have specific type of isomers that share the same molecular formula but different bonding structure and patterns. To identify a constitutional isomer the easy way is to count the number of carbon and the degree.

Isomers that have same composition but have different orientation in space is known as stereoisomers. it is of two types diastereomers and enantiomers.

the non-superimposable mirror images are formed by enantiomers.

diastereomers are not mirror images but they are non-superimposable

Here in this figure the given are stereoisomers and it is diastereomer.

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this question was incomplete and there was no figure. i gave attached a fig accordingly answered the question.