The statements correctly describe resonance structures is The actual molecule is an average of the Lewis structure. Therefore, option B is correct.
What is Lewis structure ?The representations known as Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
The electronic bonding of a single polyatomic species, including fractional bonds and fractional charges, is described by resonance structures, which are a collection of two or more Lewis structures.
In comparison to separate resonance structures, the resonance hybrid is more stable. The movement of a charge between two or more atoms is frequently represented by resonance structures. These atoms have a more evenly distributed charge, which makes it more stable.
Thus, option B is correct.
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What are the 3 goals of fire prevention?.
The three goals of fire prevention include to lessen the risk of ignition, to enable quick emergency response, and to guarantee safe emergency evacuation of residents.
The objectives of fire-prevention programs are avoiding fatalities, property loss, and building inactivity. It is common for fires to disrupt corporate operations, destroy important records, reduce employee productivity, and result in liability claims if the fire spreads to nearby premises. These are the goals of fire prevention.
Your fire prevention strategy must at the very least include: The types of fire protection equipment required to control each major hazard, a list of all major fire hazards, safe handling and storage practices for hazardous materials, potential ignition sources and their control measures.
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Is an electronegativity difference of 0. 4 polar or nonpolar?.
A bond is considered nonpolar if the electronegativity difference is less than about 0.4.
A bond is considered polar if the electronegativity difference of the atoms in the bond is greater than 0.4. If the electronegativity difference is less than 0.4, the bond is essentially nonpolar. If there are no polar bonds, the molecule is non-polar. To determine whether a molecule is polar or nonpolar, it is often useful to look at the Lewis structure.
Nonpolar compounds are symmetrical. That is all sides around the central atom are identical. That is, they have no unshared pair of electrons and are bonded to the same element. Bonds with an electronegativity difference between atoms of 0.5 to 2.1 are called polar covalent bonds. A polar covalent bond is a covalent bond whose shares are unequal because atoms have unequal attractive forces on electrons.
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the student is now told that the four solids, in no particular order, are aluminum chloride ( alcl3 ), sugar ( c6h12o6 ), butanoic acid ( c3h7cooh ), and potassium bromide ( kbr ). assuming that conductivity is correlated to the number of ions in solution, rank the four substances based on how well a 0.20 m solution in water will conduct electricity.
In order of conductivity, calcium bromide, potassium bromide (KBr), benzoic acid, and sugar are the least conductive materials. Benzonic acid, Ca2Br KBr C6H5COOH, and C6H12O6 (sugar).
How is electrical conductivity tested?You can test a material by inserting something between the wire's two free ends. Put the free end of the wire on one side of the object and the other end on the other side. The substance is conductive if the bulb illuminates; otherwise, it is an insulator.
How can copper wire's conductivity be determined?The opposite of resistivity, which is defined as resistance times cross-section area divided by length, is conductivity. Consequently, measure the length and resistance using a micro-ohmmeter.
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What are the adaptations of the gas exchange system?.
Moist walls: Gases dissolve in the moisture, which makes it easier for them to cross the gas exchange surface. Gases can travel through walls that are permeable.
Describe what gas is.A gas is a sample of matter that, in spite of gravity and independent of the volume of the container in which it is held, conforms to the shape of the container in which it is held and generates a uniform density inside the container.
What is the reason behind the increase in petrol prices?According to major oil-producing countries Saudi Arabia and Russia, there will be a 2 million barrel per day decrease in oil production. Americans will eventually pay for that decision when they fill up their petrol tanks.
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suppose you had molecular oxygen (o2) chilled enough so that it was in liquid form. which of the following best describes the phase changes that would occur as you heated the liquid oxygen to high temperature?
It would evaporate into a gas, then the molecules would dissociate into individual oxygen atoms, then the atoms would become increasingly ionized as you continued to raise the temperature.
What ionize?Converting (an atom, molecule, or substance) into an ion or ions, typically by removing one or more electrons is known as ionize.
What is an ion?An ion is an atom or group of atoms that has an electric charge. Ions with a positive charge are called cations. Ions with a negative charge are called anions. Many normal substances exist in the body as ions.
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What is a Type 1 ion?.
Compounds having type I cations should be named accordingly; type I cations only have one potential charge. Type I cations are formed by each member of the first two groups.
Definition and examples of cations.They emerge from the loss of an elemental metal's electrons. Several electrons, if not all of them, are lost. Protons outnumber electrons in it. Their net charge is positive as a result. The cations calcium (Ca2+), potassium (K+), and hydrogen (H+) are a few examples.
definition of cations and anionsPositively charged cations are ions. The negatively charged ions are known as anions. Molecular or atomic charges are known as ions. A balanced atom becomes a positive charge cation if one or more electrons are lost from it. Positively charged anion is what happens to a balanced atom if it gains one or even more electrons.
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What does you sound like you are somnolent mean?.
somnolence mean you're feeling sleepy or drowsy.
Informally referred to as food coma, postprandial sleep, the after-dinner dip, or the itis[1] in African-American Vernacular English, somnolence is a common state of sluggishness or lethargy after a meal. Postprandial somnolence consists of two parts: a general state of low energy associated with activation of the parasympathetic nervous system in response to mass in the gastrointestinal tract, and a specific state of sleepiness.[2] While there are many theories explaining this behavior, including decreased blood flow to the brain, neurohormonal modulation of sleep through digestive coupled signaling, or vagal stimulation, very few have been explicitly tested. Human studies have only hazily looked at postprandial sleep behavior so far, showing probable changes in EEG spectra and self-reported sleepiness[3]. The only clear animal study on postprandial sleep behavior so far is that of the rat.
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eukaryotic dna is located in the (fill the blank), and its message reaches the ribosome by passing through the (fill the blank).
Eukaryotic DNA is located in the nucleus and its message reaches the ribosome by passing through the nuclear pore.
What is meant by eukaryotic DNA ?Eukaryotic DNA has telomeres at each end to prevent degradation and is linear, compacted into chromosomes by histones. Circular DNA and smaller, transferrable DNA plasmids are both found in prokaryotes. Nuclear DNA and mitochondrial DNA are both present in eukaryotic cells.
Eukaryote refers to any cell or organism with a separate nucleus. A nuclear membrane encircles the nucleus of a eukaryotic cell, which contains the distinct chromosomes (bodies that hold the genetic material).
Each chromosome's DNA molecule, which has the shape of a double helix, is first wound around histone protein clusters. The smallest unit of DNA packing structure is a nucleosome, which is made up of about 200 base pairs of DNA wrapped around eight histone proteins.
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table sugar (sucrose) can be dehydrated to make activated carbon. assuming the collection of the activated carbon is in 100% yield, what mass of sugar is needed to make 733.2 g of carbon.
To make 733.2 g of carbon we need 1710g of sucrose.
For the dehydration of 1 mol of sucrose we get 144 gram of sucrose thus to get 733.2 g of carbon we need [tex]\frac{733.2}{144}[/tex] mol = 5 mol of sucrose, and 1 mol of sucrose = 342 g of sucrose so 5 mol means 5*342= 1710 mol.
Dehydration: Simply meaning is the removal of water molecule from the compound. [tex]C_{12} H_{22} O_{11}[/tex]→12C+11[tex]H_{2} O[/tex]
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How long is the Texas TABC course?.
The seller/server programme must cover two hours time of material, according to TABC.
You may, however, work through the material at your own pace. TABC is obtained in 45 to 60 days. This time can vary depending on the type of license or permit you've applied for and the certification required by the city and county of the proposed location's local governing authorities.
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Are there 18 nonmetals in the periodic table?.
There are 18 nonmetals on the Periodic table. All these nonmetals are located in the upper right corner of the Periodic table (Hydrogen is located in the left top corner).
The nonmetal elements are the least efficient heat and electric current conductors and have the highest degree of fragility. They are above the broken line connecting groups 14 to 17 to the right of the periodic table, and they include hydrogen. In the accompanying illustration, they were highlighted in yellow. Only a small percentage of the elements on the periodic table are non-metallic. Non-metals are located on the periodic table to the right of the zigzag line that connects the elements astatine, boron, silicon, arsenic, tellurium, and tellurium. Hydrogen is a non-metal that is situated to the left of metalloids.
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a 2.20 sample of the of the diprotic acid h2x reacts completely with 44.2 ml of 0.450 m naoh solution. what is the molar mass of h2x?
The molar mass of h2x is 222.22 g/mol
H2X + 2NaOH → Na2X + 2H2O
Mole NaOH = concentration × volume
= 0.450 × 44.2 × [tex]10^{-3}[/tex]
= 0.01989mol
Mole H2X = 0.01989 / 2 = 0.0099mol
H2X and NaOH has 1 : 2 molar ratio
Molar mass = mass / mole =2.20/0.0099 = 222.22 g/mol
A chemical compound's molar mass is calculated by dividing its mass by the number of moles measured in moles that make up the sample of that compound. In contrast to molecular properties, a substance's molar mass is a bulk property. The comp0und is present in many different forms, each with a different mass as a result of the isotopes. The mlar mass represents the average of these masses. The molar mass is most frequently calculated from the standard atomic weights and is a function of the relative abundance of the constituent atoms' isotopes on Earth. It is thus a terrestrial average. The conversion betwen a substance's mass and amount can be done using the molar mass.
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Calculate the solubility of PbCO3 in water at 25 degree C. You'll find Ksp data in the ALEKS Data tab. Round your answer to 2 significant digits.
The solubility of PbCO3 in water at 25 degree C. You'll find Ksp data in the ALEKS Data tab is 0.726 x10^-four g/L.
Here Ksp = 7.four x 10-14s^2 = 7.four x 10-14s= 2.seventy two x10^-7 mole/Ls =267.20 x 2.seventy two x10^-7 g/L = 0.726 x10^-four g/LSolubility is the new bond formation between the solute molecules and solvent molecules. In terms of quantity, solubility is the maximum concentration of solute that dissolves in a known concentration of solvent at a given temperature.
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calculate and record the following data in the table. name propane butane methane molar volume (l/mol) average molar volume (l/mol)
Name Molar volume(L/mol) Average Molar volume(L/mol)
Propane 22.045 987.6
Butane 23.43 1303.8
Methane 22.37 359.3
How is the Molar volume calculated ?Molar volume is directly proportional to molar mass and inversely proportional to density. The formula for molar volume is expressed as:
[tex]Vm = \frac{Molar mass}{Density}[/tex]
where,
[tex]Vm[/tex] is the molar volume of the substance
For Propane : The molar mass of propane is 44.09 g/mol
The Density of propane is 2 kg/m³
Therefore,
[tex]Vm = \frac{Molar mass}{Density}[/tex]
[tex]Vm[/tex] = 44.09 / 2
Hence, Molar volume is 22.045 L/mol
For Butane :
The molar mass of butane is 58.12 g/mol
The Density of butane is 2.48 kg/m³
Therefore,
[tex]Vm = \frac{Molar mass}{Density}[/tex]
[tex]Vm[/tex] = 58.12 / 2.48
Hence, Molar volume is 23.43 L/mol
For Methane :
The molar mass of methane is 16.04 g/mol
The Density of methane is 0.717 kg/m³
Therefore,
[tex]Vm = \frac{Molar mass}{Density}[/tex]
[tex]Vm[/tex] = 16.04 / 0.717
Hence, Molar volume is 22.37 L/mol
How to calculate average molar volume ?Average molar volume is given by ,
1 mole of gas = 22.4 L volume
For propane:
average volume is 22.4 × 1 mole
average volume is = 22.4 × 44.09
Therefore , Average volume is 987.6 L/mol
For butane:
average volume is 22.4 × 1 mole
average volume is = 22.4 × 58.12
Therefore , Average volume is 1301.8 L/mol
For methane:
average volume is 22.4 × 1 mole
average volume is = 22.4 × 16.04
Therefore , Average volume is 359.3 L/mol
What is molar volume ?At standard temperature and pressure (STP), molar volume (Vm) is the volume occupied by one mole of a chemical element or compound. It can be calculated by dividing the molar mass (M) by the mass density (ρ). A molar gas volume is one mole of any gas at a given temperature and pressure has a constant volume.Can learn more about molar volume from https://brainly.com/question/28141239
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What are the problems with chemicals exposure?.
The problem with chemical exposure is the weakening of the immune system, cancer, asthma, etc.
Accidents or improper use of chemicals can have immediate health effects like burns, irritation of the skin or eyes, or poisoning.
Chemicals can also have long-term health effects. These typically occur as a result of prolonged exposure to particular chemicals.
Long-term health effects may include, depending on the chemical:
cancer.organ harm.Weakening of the immune systemonset of asthma or allergies.problems with reproduction and birth defects.effects on the body, mind, or intellect in the growth of children.Know more about chemical exposure here: https://brainly.com/question/29553597
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if you react a secondary alkyl halide with a reagent that is both a strong base and a strong nucleophile, which reaction(s) are likely to occur? (choose all that apply)
If you react a secondary alkyl halide with a reagent that is both a strong base and a strong nucleophile, the Tertiary alcohols do not require such catalyst as they are more reactive.
What is nucleophile?
Typically, a good nucleophile is a good base. Therefore, strongly nucleophilic compounds have negatively charged O, N, and C atoms, making them strong bases. Examples include NH2, RO, OH, RLi, and RC:C:.
What is secondary alkyl halide?
A type of alkyl halide (haloalkane) in which the halogen atom (F, Cl, Br, or I) is joined to a secondary carbon. The general structure of secondary alkyl halides. X is any atom other than carbon, typically hydrogen.
Alkyl halide is prepared by the reaction of an alcohol with HCl in which -OH group is replaced with Cl.
Primary and secondary alcohols requires catalyst such as anhydrous zinc chloride.
Tertiary alcohols do not require such catalyst as they are more reactive.
Therefore, If you react a secondary alkyl halide with a reagent that is both a strong base and a strong nucleophile, the Tertiary alcohols do not require such catalyst as they are more reactive.
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a 2o amine reacts with a ketone or aldehyde under mildly acidic conditions to give an enamine. organize the steps that follow initial carbinolamine formation in the correct order, starting with the first step at the top of the ilst.
The OH group being protonated Getting rid of water the old alpha carbon atom undergoes deprotonation.
An amine's ingredients:Amines are organic substances that have a lone pair of nitrogen atoms in them. In essence, they are produced by replacing one or even more hydrogen atoms in ammonia (NH3) with an alkyl or aryl group, giving them the names alkylamines and arylamines, respectively.
What sort of substance is an amine?come to m Organic molecules, biologically active aldehydes, trimethylamine, and phenol are examples of essential amines; for such a list of amines, see Class: Amines. Amines are a different name for inorganic ammonia compounds, including monochloramine (NClH2). The amino group is denoted by the substituent -NH2.
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some amount of ideal gas with internal energy u and initial temperature 100 was compressed to half of volume meanwhile absolute pressure
A little amount of an ideal gas that had an internal energy of u and a starting temperature of 100 were compressed to half its original volume while maintaining a constant absolute pressure.
What is temperature explain?Temperature is a unit used to represent hotness or coolness on any of a number of scales, include Fahrenheit and Celsius. According to temperature, heat energy will naturally move from a hotter (body with a temperature higher) to a colder (body with a lower temperature) (one at a lower temperature).
What is the unit of temperature?Under the World System of Units, Kelvin, denoted by the letter K, is really the Si derived unit of temperature. In the fields of science and engineering, the Kelvin scale is commonly acknowledged or utilized.
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Can you store lemonade in a pewter pitcher?.
All of these are not fit for human consumption and shouldn't be used with food, including pewter (which may include some copper, silver, or lead), copper, zinc, and galvanized goods,.
A pewter pitcher is used for what.Elegant pewter pitchers are great for pouring iced coffee, crushed ice, and possibly even wine. Every single one of our handcrafted pewter pitchers is created using traditional techniques. They continue to be lead-free, just like all of your other pewter goods.
Safe pitchers made of pewter.Today's pewter is safe to use and lead-free. It is mostly formed of tin, with perhaps a little amount of copper and antimony. The items have received certification stating that they are fully lead-free and safe to use with any type of food.
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write balanced equations for the thermal decomposition of potassium nitrate under the following circumstances. (o2 is also formed in both cases.) potassium nitrate, nitrite, and oxide are liquids. include the physical states of reactants and products in the equations.
The required balanced thermal decomposition of potassium nitrate chemical equation is:
2KNO 3(s)→2KNO 2(s)+O2 (g)
Heat causes potassium nitrate to break down into potassium nitrite and oxygen. The crystalline solid potassium nitrate has a color ranging from white to dirty gray. soluble in water. Noncombustible but helps combustible things burn more quickly. An explosion could happen if there is a fire that involves a lot of material or if the material is finely divided. may blow up if exposed to heat or fire for a long time. In fires, toxic nitrogen oxides are created. used in fertilizers, explosives, and solid propellants. Strong oxidizer potassium nitrate, or KNO3, is a crystalline salt that is employed in fertilizer, medicine, and the production of gunpowder.
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Given a reaction between an organic molecule, denoted as a, and nash, we observe the following observations. Using the observations, write a rate law for the reaction.
When [A] concentration is lowered in half and [NaSH] concentration is quadrupled, the rate doubles.
What is molecule and example?The simplest unit of any substance consisting of one or more components that may exist on its own while having each of the material's physical and chemical characteristics is called a molecule. In molecules, more atom division takes place. For instance, the atom and molecule of oxygen are represented by the letters O & O2, respectively.
What is a molecule or atom?Particles are referred to as the "basic building units of matter." The smallest building blocks of a substance are the qualities of the chemical element. Covalent (chemical) bonds hold one or more atoms together to form molecules.
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The pressure on a 5.00 L of N₂O decreases from 1.25 atm to 1.00 atm. If the temperature does not change, what will the new volume be?
identify the variables
put the equation that you use
plug in all of the numbers
answer
Considering the Boyle's law, if the temperature does not change, the new volume will be 6.25 L.
Boyle's lawThe gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.
Boyle's law is one of the gas laws that relates the volume and pressure of a certain quantity of gas kept at constant temperature.
This law states that the pressure of a gas in a closed container is inversely proportional to the volume of the containert. That is, if the pressure increases, the volume decreases; while if the pressure decreases, the volume increases.
Mathematically, Boyle's law states that the product of pressure and volume is constant:
P×V= k
where P is the pressure and V the volume, being k a constant.
Studying two different states, an initial state 1 and a final state 2, it is satisfied:
P₁× V₁= P₂×V₂
New volumeIn this case, you know:
P₁= 1.25 atm V₁= 5 LP₂= 1 atmV₂= ?Replacing in Boyle's law:
1.25 atm× 5 L= 1 atm× V₂
Solving:
(1.25 atm× 5 L)÷ 1 atm= V₂
6.25 L= V₂
Finally, the new volume will be 6.25 L.
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how can we tell the temperature of the substance as it is being heated by the bunsen burner? (a) we already know the temperature of a bunsen burner flame. (b) the temperature is shown on the display at the lower left. (c) we can use the flame color to tell the temperature of the substance being heated.
Answer:
(b) the temperature is shown on the display at the lower left.
Explanation:
What are the 4 types of citation?.
The 4 types of citations are APA, MLA, Chicago, Turabian
Giving credit to others for their creative and intellectual works that you used to support your research can be done through citations. Additionally, it can be used to track down specific sources and prevent plagiarism. A citation typically contains the author's name, the date, the name of the publisher, the name of the journal, or a DOI (Digital Object Identifier).
APA- Education, psychology, and the sciences all use APA (American Psychological Association).MLA -The Humanities employ MLA (Modern Language Association) style.Chicago and Turabian -Business, history, and the fine arts typically use the Chicago/Turabian referencing style.Read more about citations at:
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calculate the volume in liters of a 0.237 molll potassium permanganate solution that contains 175. g of potassium permanganate
volume of 4.672 L of a potassium permanganate solution that contains 175g of potassium permanganate.
Molarity is the measure of the molar concentration of the chemical species defined to be the number of moles of the solute divided by the volume of the solution. solution of potassium permanganate, KMnO4, is said to have a molarity of 0.237 mole/l . This tells you that every 1 L of this solution will contain 0.237 moles of solute.
Now we have to convert the molarity of the solution moles/liter to grams per milliliter. Molar mass of potassium permanganate is 158.034g/mole.
so, 0.237 moles of potassium permanganate is equals to,
= 0.237 moles KMnO4 . 158.034g / 1 mole of KMnO4
= 37.454 g
so the Molarity of the solution equivalent to the concentration of,
0.237moles of KMnO4 / 1 L solution = 37.454 g KMnO4 / 1l
Potassium permanganate solution contains 175g of potassium permanganate.
=175g KMnO4 . 1l solution /37.454g KMnO4
= 4.672 L solution.
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If a molecule has a square planar molecular geometry, what must be its hybridization?.
The hybridization of a molecule with a square planar molecular geometry must be sp3d2.
What is hybridization?Hybridization can be defined as the process of combining two atomic orbitals to create a new type of hybridized orbitals.
Hybridization is primarily carried out by atomic orbitals of the same energy level. However, both fully filled and half-filled orbitals can participate in this process if their energies are equal.
Features of HybridizationHybridization occurs between atomic orbitals with equal energies.The number of hybrid orbitals formed equals the number of atomic orbitals that mix.It is not required for all half-filled orbitals to participate in hybridization. Even orbitals that are completely filled but have slightly varying energy can participate.Hybridization occurs only during bond formation, not in a single gaseous atom.If the hybridization of the molecule is known, the molecule’s shape can be predicted.The larger lobe of the hybrid orbital is always positive, while the smaller lobe on the opposite side is always negative.Types of HybridizationHybridization can be classified as sp3, sp2, sp, sp3d, sp3d2, or sp3d3 based on the types of orbitals involved in mixing.
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a 24.0 g sample contains 14.6 g cl and 9.40 g b. what is the percent composition of chlorine in this sample?
The percentage of chlorine in this 24.0 g sample, which contains 14.6 g of chlorine and 9.40 g of boron, is 60.83%. Chlorine reacts with organic substances and ammonia, according to its chemical properties (Cl 2 ).
resulting in chloramines or chloro-organics. Chloramines are among the chlorine compounds that exhibit disinfectant capabilities and are detected via a chlorine residue test. When present in wastewater, it serves as a reducing agent.
In this sample, boron makes up 39.17% of the total makeup.
Chlorine weighs 14.60 g in total.
Boron weighs 9.400g in total. Boron is indicated by symbol B.
Sample weight is 24.00 g.
Following are the formulas for calculating chlorine percentage composition:
chlorine content as a percentage = 14.60 / 24 100
proportion of boron is equal to 1460/24.
percentage composition of Boron = 60.833
percentage composition of Boron ≈ 60.83 %
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Which of the following molecules is not involved in the maintenance of the resting membrane potential?a. potassium cations
b. ATP
c. voltage-gated ion channels
d. calcium cations
Calcium cations are molecules that do not play a role in preserving the resting membrane potential.
How much membrane potential is present at rest?The inward rectifier potassium channel, also known as an anomalous rectifier potassium channel, is the specific class of potassium channel that controls the resting membrane potential. It is incredibly low when calcium is at rest. The resting membrane potential does not, therefore, include calcium.Depending on their cell type, every cell in the body has a distinctive resting membrane potential. The three types of muscle cells—smooth, skeletal, and cardiac—and neurons, however, are of primary significance.Calcium cations are molecules that do not play a role in preserving the resting membrane potential.To learn more about Resting membrane potential refer to:
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identify the strongest acid. question 26 options: a) 2.00 m hcl b) 2.00 m hclo c) 2.00 m hcn d) 2.00 m c6h5oh e) 2.00 m hf
The strongest acid is 2.00 m hclo
What are the strong acids?Fluoroantimonic acid, a superacid mixture of antimony pentafluoride and hydrofluoric acid, holds the title of being the strongest of them all.
Here is a list of the chemical formulas for each of the seven strong acids:
Acid chloride: HClO3.Acid hydrobromic: HBr.Acid hydrochloric: HCl.Acid hydroiodized: HI.HNO3, or nitric acid.Acid perchloric: HClO4.H2SO4 is sulfuric acid.Element 118, sometimes known as oganesson, is the heaviest element in terms of atomic weight. Osmium or iridium has the highest density of all elements. The most dense element fluctuates depending on the circumstances because density is dependent on temperature and
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based upon the intermolecular forces present, rank the following substances according to the expected boiling point for the substance. n2 hbr hf nacl
Based on the intermolecular forces we can see that N2 will have the least boiling point and NaCl will have the highest boiling point.
An intermolecular force is an attractive force that arises between the positive components or also called as protons, of one molecule and the negative components that is the electrons of another molecule. Various physical and chemical properties of a substance are generally dependent on this force.
These forces are the weak attractive forces that keep the molecules together in a particular physical state.
The strength of these forces depends on the structure of the molecules of the substance and also on the nature of bonding between their atoms.
N2 is having London dispersion forces, NaCl = electrostatic forces, HBr = dipole dipole forces and HF = dipole dipole forces.
Since the boiling point of a substance increases with increasing strength of the intermolecular forces, we can say that N2 molecule has the least boiling point and NaCl has the maximum boiling point.
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