Chemistry..... HELP PLEASE :)))

The correct abbreviation for each metric unit is:

Kilogram - kg, Milliliter - ml, Kilometer- Km, Meter- m, Millimeter - mm, Centimeter - cm, Gram - g,  Liter - L, and Milligram - mg.

The metric system can be described as a system of measurement that succeeded the decimalized system based on the meter.  Each of the fundamental dimensions can be expressed by a single base unit of measure.

For quantities derived from the base units of the system, units derived from the base units are used such as the square meter being the derived unit for the area, a quantity derived from length.

Metric units can be described as units based on the meter, gram, or second and decimal multiples or sub-multiples of these. The units of the International System of Units (SI). By extension, they involve units of electromagnetism from the CGS units and SI units systems.

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The percent yield of the reaction between ammonia gas with oxygen gas is 90.52%.

A chemical reaction between ammonia gas (NH3) with oxygen gas (O2)

NH₃ + O₂ → NO₂ + H₂O

The balanced reaction 4NH₃ + 7O₂ → 4NO₂ + 6H₂O

Calculate the number of moles from the reactant

According to stoichiometry, the number of moles NO₂ with the number of moles O₂ has the ratio with the coefficient in reaction.

The percent yield NO₂ is the ratio of the actual number of moles NO₂ with the theoretical number of moles NO₂ times 100%.

P = (1.35 ÷ 1.49) × 100%

P = 0.9052 × 100%

P = 90.52%

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PCC is a selective oxidizing agent and oxidize the Alcohol to aldehyde and ketone.

CrO3 is a strong oxidizing agent and oxidize the Alcohol to Carboxylic acid.

Claisen condensation reaction gives beta keto ester.

Last reaction is an example for intramolecular Aldol condensation.

What are the applications of cyclopentanol?

(1) Cyclopentanol is used in medicines, dye preparations and spices, and can also be used as a solvent for medicines and spices.

(2) Used in organic synthesis intermediates, used in the production of medicines, dyes and spices, also used as a solvent for medicines and spices.

Therefore,

PCC is a selective oxidizing agent and oxidize the Alcohol to aldehyde and ketone.

CrO3 is a strong oxidizing agent and oxidize the Alcohol to Carboxylic acid.

Claisen condensation reaction gives beta keto ester.

Last reaction is an example for intramolecular Aldol condensation.

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if you were to run a control experiment to confirm the results of a back titration, we will be removed from the experiment is the titrant.

The back titration is different to the direct titration. in the back titration the analyte directly reacts with titrant. the back titration is the indirect titration the is used when the reaction is is too slow for the direct titration. During the back titration the reagent B is added with the analyte A . The amount of reagent B is chosen in the excess and after the titration the excess reagent then titrated to titrant T.

The amount of analyte calculated by the difference between the added reagent and the remaining excess reagent.

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140 mg of Pb are present in 0.14 ml of water, which is the amount of anything per unit volume, area, or length.

What is density, for instance?

How much "stuff" is contained in a specific quantity of space is determined by its density. For instance, a brick of the harder, light element gold (Au) would be denser than a block of a heavier element led (Pb) (Au). Styrofoam blocks are less dense than bricks. Weight per unit volume is how it is defined.

Is water a good illustration of density?

Density is essentially the mass of a substance per unit volume. Water has a density of about 1 gram per milliliter, however this might vary depending on temperature or the things that are dissolved in it.

Briefing:

density = mass / volume      (i)

Given mass of the Pb in milligram ( mg ) = 140 mg

Given mass of the Pb in gram ( g ) = 140 ×  = 0.14 gram

Given density = 1.0 g/ml

We have to find volume of water in milliliter ( ml ) .

Equation I gives us the amount of water in milliliters when we enter the mass of the Pb, lead, and density ( ml ).

density = mass / volume

1.0 g/ml  =  0.14 gram / volume

volume =  0.14 gram / 1.0 g/ml = 0.14ml

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The gas that would have a density of 1.21 g/l at 7.0°c and 0.987 atm is N₂.

The correct option is A.

The density of a substance is given as the ratio of the mass and the volume of a substance.

In order to determine the gas, we must first calculate the molar mass of the gas.

The molar mass of the gas is determined using the Ideal gas equation.

Molar mass = mass/moles

The Ideal gas equation is given below:

PV = nRT

where,

Data given:

P = 0.987

T = 273 + 7 K or 280 K

density = 1.21 g/L

Hence, mass = 1.21 g, volume = 1 L

Solving for n;

n = PV/RT

n = 0.987 * 1 / 0.082 * 280

n = 0.043 moles

Molar mass = 1.21 / 0.043

Molar mass = 28.1 g/mol

This is the molar mass of N₂.

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Complete question:

Which of the following would have a density of 1.21 g/L at 7.0°C and 0.987 atm?

N₂

Ar

Xe

Ne

CO₂

If the heat of fusion of the frozen veggies is the same as the heat of fusion of water (79.8 kcal/kg), then 41.9 Kcal are needed to defrost them.

Heat is indeed an indicator of change, not a quality that an item or system possesses. It is categorized as a variable as a result. Temperature can be expressed in Fahrenheit (°C), Kelvin (K), Celsius (°F), or Rankine units and represents the kinetic energy average for molecules inside a substance or system (R).

Mass of frozen vegetable , m = 0.525 kg

The heat of fusion , Lf = 79.8 Kcal /kg

The necessary heat, Q = m * Lf

Q = 0.525 * 79.8 Kcal

Q = 41.9 KCal

The necessary heat is 41.9 Kcal.

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The complete question is-

Suppose you have a 0.525 Kg package of frozen vegatables at 0°C. How much heat, in kilocalories, is required to thaw the frozen vegetables if their heat of fusion is the same as that of water (79.8 kcal/kg)?

Answer:

Water is a compound, and is made up of one Hydrogen atom and two Oxygen atoms, even though water is so common, it’s made of multiple elements so it couldn’t be one.

The time required for a 100 g sample of nitrogen-16 to decompose into 12 g of nitrogen-16 in 21. 6 s is 7.2 seconds.

Initial weight  N₀=100  g

Final weight  N=12.5  g

Time  t=21.6  sec

[tex]t_{1/2}[/tex]=?

Solution:

t=n∗[tex]t_{1/2}[/tex]

N/N₀=(1/2)ⁿ

12.5/100=(1/2)ⁿ

1/8=(1/2)ⁿ

(1/2)³=(1/2)ⁿ

Thus,

n=3

[tex]t_{1/2}[/tex]=t/n

[tex]t_{1/2}[/tex]=21.63/3

[tex]t_{1/2}[/tex]=7.2  sec

Consequently, the sample's above half-time is 7.2 sec.

A sample is described as a smaller set of data that a researcher selects from a larger population using a predetermined selection procedure. Observations, sample points, or sampling units are terms used to describe these components. An effective way to carry out research is to create a sample. The majority of the time, it is either difficult, expensive, or time-consuming to conduct a population-wide study. Insights are thus gained by studying the sample that the researcher can then extrapolate to the overall population.

For instance, suppose a cell phone maker wanted to survey US university students about their favorite features. An extensive research study is necessary if the researcher wants to find out the features that students utilize, the features they would want to see, and the price they are prepared to pay.

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Utilizing a calorimeter, it is possible to determine the heat of combustion.

A calorimeter is a device that is thermally isolated from the environment and used to measure the amount of heat exchanged between two bodies of different temperatures.

It is possible to experimentally quantify the levels of the heat emitted or absorbed by a specific material in chemical processes using a calorimeter.

Since some water is heated by the energy produced, it is possible to monitor the temperature variation and determine the amount of heat.

Water serves as the benchmark ingredient for the calorimeter studies since its specific heat is known.

The following is the heat of combustion formula:

ΔH=−mCΔT

Where,

H is the heat of combustion, expressed in KJ;

The calorimeter's water mass is measured in grams (g), its specific heat is 4.2 J/g/C, and the water's temperature change is measured in degrees (T) (variation between final water temperature and initial water temperature)

Despite the fact that the heat of combustion value must be negative, the heat of combustion equation is still multiplied by 1.

This is due to the fact that combustion releases heat because it is an exothermic reaction. The molar heat of the combustion equation can also be said to be this.

Divide the heat of combustion by the quantity of moles in the sample being studied, though, in order to get the molar heat of combustion.

The sample's molar mass and sample size must be known for this. The water molar mass and the starting and stopping temperatures for the mass are additional crucial factors to consider when utilizing a calorimeter.

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Due to Sp3d2 hybridization, the KrF4 Lewis structure has a square planar form. has four fluorine atoms and the central krypton atom. The form of the krypton tetrafluoride molecule matches the VSEPR theory.

Is the structure of KrF4 square-planar?

Krypton possesses two lone pairs compared to 3 for all Fluorine atoms. The KrF4 has a bond angle of 900 and a square planar shape.

krf4: Is it tetrahedral?

By doing so, krypton and fluorine will both form a stable octet, resulting in a tetrahedral structure as opposed to the square planar one seen in the preceding image. Detail the section of the ridding of electron pairs.

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The density of a solution of hydrochloric acid in relation to the density of water is 1.18 g/mL. If 13.7 mL of hydrochloric acid solution is used, the mass of the hydrochloric acid solution is 13.7 mL x (1.18 g/mL) = 16.2 g.

HCl has how many moles?

The mole amount of HCl equals the mole quantities of hydrogen and chlorine in the sample because each molecule of HCl contains one mole of hydrogen and one mole of chlorine.

How many moles of HCl are there in 1 mL?

However, in order to get a trustworthy response, you need to know the density of that solution if you meant a volume of that solution that included 1 mole of HCl. In response, 1 mol of HCl will be present in 88.6 mL of a 35%m/m solution.

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The conclusion that is consistent with the explanation is that substance C is a mixture because it contains 2 different compounds. Option C.

Mixtures are substances that contain two or more different substances mixed together. These mixed substances do not react together but maintain their chemical identities such that each can be recovered by physical means.

Thus, when a mixture is examined, it can be found to contain more than one compound. These mixtures are separatable by physical separation methods such as filtration, evaporation, decantation, etc.

Thus, the conclusion that goes with the right explanation is that substance C is a mixture because it contains 2 different compounds.

Option A is incorrect because mixtures do not require running an electric current through them for separation. B is incorrect because a substance being consistent does mean that it is pure. D is incorrect because a substance being pure does not mean it won't react.

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Barium nitrate(BaNO3)+sodium sulfate(Na2SO4)---> Barium sulfate(BaSO4)+ sodium sulphate(Na2SO4).Thus 1 mole of Barium nitrate will yield one mole of Barium sulfate ;

Total Volume= 1L

Concentrarion in Molarity=1.55(M)

Now we know Molarity=Moles of Solute/Volume of solution in L

Therefore,no of moles=1.55 moles

Now,No of moles= grams of barium sulfate taken/Molecular Mass

MM=233.40g/mol(given

Thus,grams of barium sulphate taken=No o moles x MM =1.55 x 233.40=361.77 g,which is the required grams of barium sulfate.

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Propanol burns with a chemical equation of 2 C3H7OH + 9 O2 + 6 CO2 + 8 H2O.

Chemical equations are given in the form of symbols with chemical formulas, and they serve as a symbolism of chemical reactions. Reactants are located on the left, and products are located on the right.

Chemical equations are used to depict how reactants change into  For instance, the combination of ferrous (Fe) and sulfide (S) results in iron sulfide (FeS). The plus symbol indicates that sulfur and iron react to form FeS.

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The major organic product of the mentioned reaction is tetralin with an alkoxy functional group and the diagram is attached below:

In organic chemistry, a functional group is a specific group of atoms or bonds within a compound that are responsible for the characteristic chemical reaction of that compound. The same functional group will behave in similar ways and undergo similar reactions regardless of the compound it is part of.

Alkoxy groups are functional groups based on oxygen, carbon, and hydrogen. A functional group is a chemical substituent attached to an organic backbone. It is a characteristic substituent of various molecules attached to an organic carbon skeleton.

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The complete question is as follows:

hope this helps

Part 1

Define matter, and an atom

Ans: An atom is the smallest unit of matter that retains all of the chemical properties of an element. matter is any substance that has mass and takes up space by having volume. Atoms are combine to form matter.

Define Protons, Neutrons, and Electrons

Ans: . Electrons are a type of subatomic particle with a negative charge. Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom's nucleus as a result of the strong nuclear force. Neutrons are a type of subatomic particle with no charge (they are neutral)

Identify the location of protons, neutrons, and electrons within an atom

Ans:Atoms are made of extremely tiny particles called protons, neutrons, and electrons. Protons and neutrons are in the center of the atom, making up the nucleus. Electrons surround the nucleus.

What is the mass and charge of a proton, neutron, and electron?

Ans: Protons, neutrons, and electrons: The nucleus contains protons and neutrons, each of which has a mass of one amu. Protons, on the otheAnsr hand, have a charge of +1, whereas neutrons are uncharged. Electrons have a charge of -1 and have a mass of around 0 amu. They orbit the nucleus and have a mass of approximately 0 amu

Define a cation and anion.

Ans:Cations are ions that are positively charged. Anions are ions that are negatively charged

Ans:Cations are ions that are positively charged. Anions are ions that are negatively chargedDraw the stable, Cation, and Anion versions of lithium and boron

How do you determine the mass and charge of an entire atom?

Ans: The mass of an atom is a weighted average that is largely determined by the number of its protons and neutrons, whereas the number of protons and electrons determines its charge. Each atom of an element contains the same number of protons, known as the atomic number (Z).

How do we use the periodic table? Identify periods and groups in a periodic table

Ans:The periodic table is arranged in order of atomic number. A period is a horizontal row of the periodic table. A group is a vertical row of the periodic table

What is the chemical symbol of an element? Atomic mass?

Ans: The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D).

Why is the atomic number of an element important? What information does the atomic number

provide us with?

Ans: The atomic number (Z) of an element is the number of protons in the nucleus of each atom of that element. This means that the number of protons is the characteristic which makes each element unique compared to all other elements.

sorry can't fit part 2

I should get 100 points for this

The main chain, regardless of bends, is the second longest carbon chain when designating an alkane. Isomers share a same molecular structure.

One or even more atoms make up molecules. If they include more than one atoms, the atoms may be the same (a molecule of water has hydrogens and one oxygen atom, for example) or distinct. An oxygenation molecule has two particles. Biological molecules like DNA and proteins can include thousands of atoms.

Molecules are inorganic entities that are composed of different molecules. Examples include typical substances like water (H2O) and co2 (CO2). When compared to ionic compounds like table salt, these chemicals are very different (NaCl).

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When 4.9 g of phosphoric acid and 7.45 g of ammonia combine, 7.45 g (NH4)3PO4 of ammonium phosphate is created.

Further assisting growth and root development is the supply of nitrogen to the surrounding soil, which is frequently accomplished using fertilizers containing ammonium phosphate. Because of its solubility, it can be quickly released into the soil, helping young plants and plants in need of revival.

The inorganic chemical with the formula (NH4)3PO4 is called ammonium phosphate. It is the orthophosphoric acid ammonium salt.

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Co2(SO4)3 is the chemical formula for cobalt(III) sulfate. The Co symbol stands for cobalt, the S for sulfur, and the O for oxygen. Sulfate is made up of one sulphur atom and four oxygen atoms.

At normal temperature, Co2(SO4)3 is a blueish green crystal. It melts at a temperature of 35 °C (95 °F). It breaks down at its melting point and will also break down in water. Co2(SO4)3 is an effective oxidizer. The Co symbol stands for cobalt, the S for sulfur, and the O for oxygen. Sulfate is made up of one sulphur atom and four oxygen atoms. In addition to being utilised in storage batteries and the electrochemical industries, cobalt 3 sulphate is also employed as a vitamin B12 supplement and as a drier in paints and inks. Cobalt 3 sulphate exposure irritates the skin, eyes, and respiratory system and has negative effects on the thyroid, lungs, heart, and kidneys.

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The empirical formula for the compound is [tex]PCl_{3}[/tex]

The empirical formula of a compound is the formula in which the atoms of all the elements are present in their simplest whole-number ratio. It's possible that a compound's empirical formula and molecular formula are different.

Given Information:

P = 10.15 mg

Cl = 34.85 mg

Convert mg to moles

                                 31 mg of P ----------------- 1 mmol

                                 10.15 mg  ------------------   x

                                 x = 0.327 mmol of P

                                  35.5 mg of Cl ------------  1 mmol

                                   34.85 mg -----------------  x

                                 x = 0.982 mmol of Cl

Divide by the lowest number of mmoles:

For P = [tex]\frac{0.327}{0.327}[/tex] = 1

For Cl = [tex]\frac{0.982}{0.327}[/tex] = 3

So the empirical formula for the compound will be [tex]PCl_{3}[/tex]

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Molecular geometry of given compound is Trigonal Bipyramidal

Number of valence electrons in sulfur is 6.

On taking an electron, valence electron in sulfur is 7 making it [tex]S^{-}[/tex]

Out of these 7 valence electrons, three will get bonded with three monovalent chlorine making three covalent S-Cl bonds.

And 2 lone pairs.

Which makes clear that [tex]S^{-}[/tex] will make 5 electron systems, out of which two re lone pairs and three are bonds with chlorine.

So, the ionic molecule will undergo the hybridization of [tex]sp^{3}d[/tex]

And the molecular geometry will be Trigonal Bipyramidal.

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H₃O⁺ = 3.09 * 10⁻². the number of aqueous ions in a concentration of hcl with a pH reading of 7.910.

A amount pf solute present in a certain solution is the product's concentration. To express concentrations, we utilize the molarity, which is the amount of solvent per 100 milliliters of solution. Qualitative units of concentration include molality, volume proportion, parts per thousand, parts per million, and parts per billion.

When you are concentrated, you can just use your assets more wisely and deal with problems more successfully. It happens less frequently when you are preoccupied to forget important details. Focusing on the task at hand makes it easier for you all to memorize knowledge.

The connection among pH and H₃O⁺ is Ph = -log H₃O⁺

Ph = -log H₃O⁺

H₃O⁺ = 10⁻Ph

H₃O⁺ = 10 ⁻⁷°⁹¹⁰

H₃O⁺ = 3.09 * 10⁻²

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A precipitate will be formed when 0.1 l of 0.00001m agno3 is added to 0.01 l of 0.001m NaCl, as Qsp > Ksp

Firstly calculating concentration of Ag+

M1V1=M2V2

where, M1 = 0.00001 M and V1= 0.1 L

While M2= ? and V2= 0.11 L

0.00001×0.1 = M2 ×0.11

M2= 9 × 10^-6 M

Calculating the concentration of Cl-

M1V1=M2V2

where, M1 =0.001  M and V1=0.01 L

Substituting the value in the equation

While M2= ? and V2= 0.11 L

0.001×0.01 = M2 ×0.11

M2= 9 × 10^-5

Qsp = [Ag+] × [Cl-]

Substituting the value in the equation

Qsp=  9 × 10^-6 × 9 × 10^-5

Qsp= 8.1 × 10^-10

Here, Ksp of AgCl= 1.5 xx 10^(-10)

Qsp>Ksp

Therefore precipitate will form.

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The order from the weakest to the strongest carbon oxygen bond length is,

       CH3OH < CO3 < CO2 < CO.

In a carbon - oxygen bond,  Carbon and oxygen form terminal double bonds in functional groups  known as carbonyl compounds to which belong such compounds as ketones, esters and carboxylic acids and many more. Bond length is defined as the distance between the centers of two covalently bonded atoms. The length of the bond is determined by the number of bonded electrons that is called bond order. The higher the bond order, the stronger the pull between the two atoms and the shorter the bond length. Generally, the length of the bond between two atoms is approximately the sum of the covalent radii of the two atoms.

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Answer:

The answer should be that a constant pressure is applied to both cylinders and they are balanced chemical equations for the reaction between nitrogen oxygen.

Explanation:

The Valence Shell Electron Pair Repulsion (VSEPR) theory allows us to predict the molecular shapes of molecules by determining the electron pair repulsion around the central atom.

This theory states that electron pairs will repel each other and will attempt to stay as far away from one another as possible, resulting in the most stable arrangement.

The Valence Bond Theory provides additional insight into molecular geometry by looking at the overlap of atomic orbitals in a molecule. The overlap of the orbitals determines the strength of the chemical bonds in the molecule and provides further insight into the molecular geometry.

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Retention times will increase if 90% methanol were used instead of 65%. The amount of solvents completely decides the elution of compounds in HPLC.

The elution order of solutes in HPLC is governed by the polarity. For a normal-phase separation, solute of lower polarity spends less time in the polar stationary phase and elutes before a solute that is more polar.

Polar compounds in the mixture passing through the column will be adsorbed more strongly to the polar silica than nonpolar compounds, which passes more quickly through the column and will be eluted quicker than polar ones.

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Since magnesium ions have a charge that is two times greater than that of lithium and sodium ions, MgF2 has a higher lattice energy than LiF and NaCl. As ion charge rises, lattice energy rises as well.

An inorganic substance with the chemical formula MgF2 is magnesium fluoride. The substance is transparent over a wide spectrum of wavelengths and is a white crystalline salt with industrial uses in optics and space telescopes. Ionic compounds, which are formed of a cation and an anion, include magnesium fluoride as an example.

The hydrogen Lyman-alpha line (121 nm) and beyond are well-transmitted by magnesium fluoride in the VUV range. Magnesium fluoride is ideal for Excimer laser applications and is mostly employed in UV optics.

Fluorine is an electronegative element, whereas magnesium is an electropositive element. Magnesium fluoride is the result of the reaction between these two, which produces an ionic product.

Lattice energy: MgF2(s) → Mg2+(g) + 2 F– (g)

Use Hess’s law: ∆Hº

Mg(s) → Mg(g) 148 kJ

F2(g) → 2F(g) 159 kJ

Mg(g) → Mg+ (g) + e– 738 kJ

Mg+(g) → Mg2+(g) + e – 1450 kJ

2F(g) + 2e–→ 2F– (g) 2(–328) = – 656 kJ

MgF2(s) → Mg(s) + F2 (g) 1123 kJ (Reaction is reversed and the sign of ∆Hº changed.)

MgF2(s) → Mg2+(g) + 2F– (g) 2962 kJ

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The intermolecular forces that are found in carbon disulfide CS2 is two bond diploes.

Intermolecular forces are the forces that are between to of  molecules. And so that's different from an to the relative  intramolecular force, whichever is the force within a molecule.

London dispersion forces supposedly have the least by its  strength out of all the intermolecular forces. But of  CS2, which has only the  dispersion forces, has a higher boiling point (and thus stronger and the  intermolecular forces) than COS, which has dipole-dipole attraction in to the addition to dispersion forces.

I suppose that it had something to do with CS2 having a thicker/more than  inducible electron shell, but it is  then a new question arises: how would you know if the dispersion forces in one molecule are stronger of  that the dipole-dipole forces in another.

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