For mercury, the enthalpy of vaporization is 58. 51 kj/mol and the entropy of vaporization is 92. 92 j/k·mol. What is the normal boiling point of mercury?.

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

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Answer:

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

Explanation:

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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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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.

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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The atomic number represents the number of protons, whereas the mass number represents the quantity of protons and neutrons. The number of protons equals the amount of electrons.

The atomic number is the number of protons. The number of neutrons may be calculated by subtracting the number of protons from the atomic mass, which is then rounded to the closest whole number.

For neutrally charged species, the number of electrons in an atom equals the atomic number of an element. This signifies that the number of electrons and protons in an element are equal. As a result, the number of electrons in oxygen is eight.

The number of valence electrons in neutral atoms equals the atom's main group number. A periodic table column can be used to determine an element's main group number. Carbon, for example, belongs to group 4 and contains four valence electrons.

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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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The pka values for the amino acid glycine are: pka,1 = 2.3 and pka,2 = 9.6. at pH = 2.3 and pH 9.6 value.

The term pH, which originally stood for "potential of hydrogen" (or "power of hydrogen"), is used in chemistry to describe how acidic or basic an aqueous solution is. Greater pH values are seen in basic or alkaline solutions than acidic solutions.

Since hydrogen ions are logarithmic, the pH scale shows how many of them are present in a solution in inverse proportion.

M = mol dm3, where. Acidic solutions have a pH under 7, while basic solutions have a pH over 7, at a temperature of 25 °C (77 °F). At this temperature, solutions with a pH of 7 are neutral (i.e., have the same amount of H+ and OH- ions, like pure water), meaning they don't react with one another. Temperature has an impact on the pH's neutral value.

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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.

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.

The net ionic equation for the reaction that occurs when aqueous solutions of sodium hydroxide and hydrocyanic acid are combines is

OH−(aq)+HCN(aq)→CN−(aq)+H2O(l)

What is ionic equation?

A chemical equation known as an ionic equation expresses the electrolytes in aqueous solution as dissociated ions.

Deprotonation of the acid by the hydroxide ion from the base occurs when weak acids like hydrocyanic acid are mixed with strong bases like sodium hydroxide. The conjugate base of the acid and water is created as a result of this reaction.

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Answer: 2 Just to clarify

Explanation:

The dye phenol red turns yellow in the presence of acid products and is included in fermentation broth for some diagnostic tests.

Phenol is an ordinary pH indicator and at a lower pH value i.e >7, Phenol red is a colorless compound. It is used to perform some diagnostic tests in the fermentation process.

The compound exhibits a sudden change in color as a result of a higher ph value.

It is composed of both negatively charged and positive charged particles i.e sulfate and ketone groups.

When it reacts with an acid the pH of phenol solution ranges between 6-8 and shows a quick transition from red to yellow indicating a pH change.

The transition from red to yellow is due to the loss of proton by the ketone group.

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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:

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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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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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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Answer:

1 cl =10 ml

so

4.22cL= 4.22×10= 42.2 mL

The temperature of a 0.137 moles of N₂O gas occupying volume of  846mL at a pressure 2.37atm is 178.48K

An ideal gas equation is :

PV =  nRT

Here: P = pressure of a gas (in atm)

         V =volume of a gas(in Litre)

         n = number of moles of a gas

         R = universal gas constant ( 0.082 [tex]\frac{Latm}{molK\\}[/tex])

         T = temperature of a gas( in kelvin)

calculation:

substitute the given values provided question in the equation.

2.37×0.846 = 0.137×0.082×T

T = 178.48K

Result : The temperature of a given N₂O gas is 178.48K.

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The correct option is option 5 that is 1s²2s²2p³.

Acc to the general electronic configuration of carbon is 1s²2s²2p².

generally the carbon contains the six electrons but with ionic charge of 1 , the carbon contains seven electrons and these electrons are filled in the orbitals acc to the Hund's rule.

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The correct Option is 5 that is 1s²2s²2p³

The atomic number of carbon is six it means the carbon has six electrons and six protons in its valence shell.

Acc to that the general electronic configuration of carbon is 1s²2s²2p ².

since the carbon has four electron in its last shell so it can share their electron with other atom to formed the compound to complete  its octet and become the neutral compound.

The orbitals present in the subshell and to fill the orbitals with electron we follow HUND's RULE.

acc to HUND's rule , every orbital are filled first filled with one electron then filled with second electron so as to make doubly occupied the orbital.

There are fours types of orbitals S,P,D,F.

In the S orbital has capacity to filled only two electrons , 2 S orbital filled 2 electrons The P orbitals has capacity to filled 6 electrons divided into 2px , 2py, 2pz (Each contain two electrons).

Since as per the question one ionic charge are added so the total number of electrons in the carbon is 7 acc to that the electrons are distributed in the orbitals.

1S² = 2 electrons

2S²= 2 electrons

2px = 1 electron

2py= 1 electron

2pz = 1 electron

Generally the carbon contain 6 electron but with ionic charge the total number of electron becomes 7 and the filling of orbital follow the Hund's rule.

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The amount of water that should be taken in order to obtain a 100 ml solution with a final concentration of 2.5 m is: 31.25 ml

To solve this problem, the formula and the procedure that we have to use is:

c1 * v1 = c2 * v2

Where:

Information about the problem:

Applying the dissolution of concentrations formula and clearing the volume of the concentrated solution (v1) we get:

c1 * v1 = c2 * v2

v1 = (c2 * v2)/ c1

v1 = (2.5 m * 100 ml)/ 8 m

v1 = 31.25 ml

In chemistry a solution is known as a homogeneous mixture of two or more components called:

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Answer:

Metallic character of the element

Explanation:

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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The third row element is phosphorus (P).

The ionization energy (Ei) is the minimum amount of energy required to remove the valence electron, when element lose electrons, oxidation number of element grows (oxidation process).

Nonmetals are far right in the main group and they have highest ionization energy, because they have many valence electrons.

Sixth ionization energy is much higher than fifth, atom has five valance electrons. Element in a third row tith five valence electrons is phosphorus.

Electron configuration for phosphorus: ₁₅P 1s² 2s² 2p⁶ 3s² 3p³.

Phosphorus lost five valence electron to form cation with stable electron configuration as noble gas neon (atomic number 10).

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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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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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The % yield of this reaction is 31.95%

Given:

Mass of C = 9.90g

Actual yield of CO2 (AY) = 11.6g

To Find:

% yield = ?

Formula:

% yield = (actual yield / theoretical yield) x 100

Calculations:

C + O2 –> CO2

mols C = mass C (g) / atomic mass C (g/mol)

mols C = 9.90 / 12 = 0.825 mols

mols CO2 = 0.825 since 1 mol CO2 for each mol C.

Theoretical CO2 yield = mols CO2 x molar mass CO2

TY = 0.825 x 44.01

TY = 36.308g

% yield = (AY / TY) x 100

% yield = (11.6 / 36.308) x 100

% yield = 31.95%

Result:

31.95% is the yield of CO2 in this reaction.

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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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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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