assuming that the copper and lead are pure, determine the relative amounts of each kind of bb. the density of copper is 8.96 g/cm3g/cm3 . the density of lead is 11.4 g/cm3g/cm3 . express your answers in percent to two significant figures separated by a comma.

The molar heat of the combustion of methane in j/mol is 5267.52 J/mol.

Given,

m = 10 g of CH₄

mol = mass/MW = 10/16 = 0.625 mol

C = 18 J/C

m = 150 g o water

dT = 30.3 - 25.5 = 4.8°C

Calculate molar combustion of methane,

calculate heat,

Q(empty) = C × dT = 18* (30.3-25.2) = 91.8 J

Q(water) = m × Cp(dT) = 150*4.184*(30.3-25.2) = 3200.76 J

Total q= 91.8 +3200.76 = 3292.2 J

This is done for 10 g of methane

Therefore,

If n = 0.625  present

Then,

H(rxn) = Q/n = 3292.2 / 0.625 = 5267.52 J/mol

Hence, the molar heat of the combustion of methane in j/mol is 5267.52 J/mol.

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The instrument used to measure atmospheric pressure specifically in the area of meteorology is Barometer.

A barometer is a scientific instrument used to measure atmospheric pressure, also called barometric pressure. The atmosphere is the layers of air wrapped around Earth. That air has a weight and presses against everything it touches as gravity pulls it to Earth. Barometers measure this pressure. Atmospheric pressure is an indicator of weather. Changes in the atmosphere, including changes in air pressure, affect the weather. Meteorologists use barometers to predict short-term changes in the weather. A barometer measures atmospheric pressure in units of measurement called atmospheres or bars. An atmosphere (atm) is a unit of measurement equal to the average air pressure at sea level at a temperature of 15 degrees Celsius (59 degrees Fahrenheit).

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The number of liters of acid needed for all of the hot tubs is the total volume of muriatic acid, which is 31, 155 ml.

Volume refers to the space occupied within the boundaries of an object in three-dimensional space. It is also called as the capacity of the object. In an object is filled with a liquid complete, there volume is the same.

In the given case that total volume of the acid would be the product of volume of each hot tub and number of hot tub containers. Hence, it is given by:

Total volume = Volume of each hot tub x number of hot tub containers

According to the given data:

Volume of each hot tub = 115 ml

Number of hot tub containers = 297

Hence,

Total volume = 115 x 297 = 31, 155 ml

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Following is the nuclear equation for the spontaneous fission of ₉₅Am²⁴3 , which results in the formation of ₅₃I¹³⁴ + ₄₂Mo¹⁰⁷ and three neutrons:

₉₅ Am²⁴3 -----> ₅₃I¹³⁴ + ₄₂Mo¹⁰⁷ + 3 ₀n¹

The neutron is a subatomic particle that has a neutral charge, the sign n or n0, and only a little bit more mass than a proton. The atom's nucleus is made up of protons and neutrons. All other nuclei require neutrons to remain stable, with the exception of the hydrogen atom, which has a single proton. Large numbers of neutrons are produced by both nuclear fusion and fission. They are crucial to the fission, fusion, and neutron capture processes that result in the nucleosynthesis of chemical elements in stars.

Two subatomic particles known as neutrons and protons are found in the nucleus of every atom. The only exception is hydrogen, which has one proton in its nucleus. Neutrons are somewhat heavier than positively charged protons and have an electric charge that is neither positive nor negative.

• ₉₅ Am²⁴3 -----> ₅₃I¹³⁴ + ₄₂Mo¹⁰⁷ + 3 ₀n¹

• From the above reaction, three neutrons are produced.

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The answer is 1687.74 L.

Solution:

PV = nRT

Divide both sides by P

V = nRT / P

V = (68.25 × 62.363 × 297) / 749

V = 1687.74 L.

Heating ammonium nitrate NH4NO3 produces nitrous oxide N2O and water H2O. The above equation is the balanced chemical reaction for the decomposition of ammonium nitrate when heated. 1 mol of ammonium nitrate breaks down into 1 mol of nitrous oxide and 2 mol of water molecules.

As mentioned earlier, potassium nitrate decomposes into metallic nitrites and oxygen gas. Potassium nitrate can be said to not produce nitrogen dioxide when heated. However, at sufficiently high temperatures, ammonium nitrate itself can violently decompose. This process produces gases such as nitrogen oxides and water vapor. It is this rapid release of gas that causes the explosion.

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In the two outermost orbitals of magnesium atoms, there are two electrons. In order to become Mg2+, an atom can shed two electrons.

Dots of electrons are represented as Lewis structures, sometimes known as Lewis symbols. In order to create the magnesium ion, or Mg2+, two electrons are supplied by the Mg atom.

As opposed to Mg2+, whose electronic configuration was discovered to be 1s2 2s2 2p6, which has the electron density of Mg as 1s2 2s2 2p6. Magnesium has a 12 atomic number.

Create a Lewis electronic band diagram by picturing the sign for mg inside a box that contains all of the core electrons. The valence electrons are then positioned so that the greatest energy level orbital on each of the box's sides corresponds to their placement.Eight electrons from the Mg2+ ion occupy the empty space in the second orbital.

Here, it should be noted that this ion possesses 8 electrons and a 2 valence shell. As a result, the Lewis structure includes eight points, and because it is a charged molecule, it is also necessary to mention the net charge. Consequently, Mg2Lewis +'s structure.

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The molar mass of the acid: 65.36 g/mol

Calculate the molar mass of given acid?

Balanced chemical equation is:

HA + NaOH ---> NaA + H2O

let's calculate the mol of HA

volume , V = 22.5 mL

= 2.25×[tex]10^{-2}[/tex] L

using:

number of mol, n = Molarity×Volume

= 0.51×2.25×[tex]10^{-2}[/tex]

= 1.147×[tex]10^{-2}[/tex] mol

According to balanced equation:

mol of NaOH reacted = (1/1) × moles of HA

= (1/1)×1.147×[tex]10^{-2}[/tex]

= 1.147×[tex]10^{-2}[/tex] = number of moles of NaOH.

using:

number of mol = mass / molar mass

1.147×[tex]10^{-2}[/tex] mol = (0.75 g)/molar mass

molar mass = 65.36 g/mol

Therefore, The molar mass of the acid: 65.36 g/mol.

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There will be variances between isotopes, however by ignoring these and using the avg mol wt of N2 = 28 and Xe = 132; Rate(N2)/Rate(Xe) = sqrt (132/28) = 2.17

Isotopes are atoms with the same quantity of protons but differing numbers of neutrons. They differ in mass, which affects their physical characteristics even if they have nearly identical chemical makeup.

There are three known one-proton nuclei that have 0 neutrons, 1 neutrons, and 2 neutrons, respectfully. They are known as hydrogen isotopes (first from Greek isos, which means "same," and topos, which means "place") since they all occupy the same location in the periodic chart that is designated for atomic number 1.

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If the density of carbon tetrachloride is 0. 793 g/ml, and a sampl.e has a volume of 9. 29 ml the mass is 7.367 g

For CCl4

Density of carbon tetrachloride = 0.793 g/ml

Volume of sample = 9.29ml

mass = density * volume = 0.793 × 9.29 = 7.367 g

The chemical name for carbon tetrachloride, sometimes referred to as tetrachloromethane and recognized by the IUPAC, carbon tet in the cleaning business, Halon-104 in firefighting, and Refrigerant-10 in HVACR, is CCl4. It is an organic compound. It has an indistinct color and a just perceptible "sweet" odor. At lower temperatures, it is almost incombustible. Prior to being phased out because to environmental and safety concerns, it was frequently used in fire extinguishers, as a predecessor to refrigerants, and as a cleaning agent. The central nervous system can be impacted as well as the liver and kidneys when exposed to high amounts of carbon tetrachloride, particularly its vapor. An extended exposure risk can be lethal.

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missing curved arrows to show the preparation of this product from the hydrochlorination of a conjugated diene. Then in part two select the common elementary steps.

Two double bonds and a single bond are what distinguish conjugated diene. Conjugated diene, notably butadiene, play a crucial role in the creation of rubber and, consequently, in the creation of the tires on our automobiles. hydrochlorination In order to chlorinate an unsaturated hydrocarbon, hydrogen chloride must be added across its numerous bonds. Alkyne (triple-bonded) reactants are the focus of Johnson Matthey's DAVYTM hydrochlorination technology. A chlorinated alkene results from this exothermic reaction.

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Its pressure distribution (in kpa) for 65 °C is P=13.32atm after 18.7 l n2 with 41. 9 l o2 and 25 °C and 125 kpa was transported to a container with such a capacity of 7. 00 l.

A physical force applied to an object is known to as pressure. For unit area, a perpendicular force is delivered to a surface of the objects. T r is the fundamental formula for pressure. Phases of project are a unit of pressure (Pa). Absolute, ambient, differential, and gauge pressures are different types of pressure.

That number of molecules of N2 is now determined

P₁.V₁=n₁.R.T₁

1.233×16.3=n₁×0.0821×298

n₁=0.822 mol

In a similar manner, we determine the quantity of O2 moles.

P₂.V₂=n₂.R.T₂

1.233×32.3=n₁×0.0821×298

n₂=1.628mol

The total number of moles of gas that must be pumped into the vessel with the dimensions of V = 4.50 L and T = 298 K equals

n=n₁+n₂

=0.822+1.628mol

=2.45mol

Let P represent the gas's final pressure,

PV=nRT

P×4.50=2.45×0.0821×298

P=13.32atm

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the lewis structure for the polyatomic hydronium cation is H₃O⁺.

The hydronium ion is written as :

H₃O⁺, to fulfil the octet rule there will be 8 valence electrons.

number of valence electrons are :

number of valence electron for 1st H atom = 1

number of valence electron for 2nd H atom = 1

number of valence electron 3rd H atom = 1

number of valence electron s for O = 6

the + sign show that there is loss of one electron, the more electronegative atom is Oxygen atom that means O atom is the central atom. therefore it has 8 valence electrons. the lewis structure is shown as below :

                 [  H - O : - H ]⁺

                           |

                           H

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The percentage of the compound is potassium is 22.53 %.

given that :

compound contains percentage of chromium = 39.37 %

compound contains percentage of oxygen = 38.10 &

compound contains percentage of potassium = ?

compound contains percentage of potassium = - 100%

                                         (percentage of chromium +  percent of  oxygen )

                                                  = 100 % - (39.37 % + 38.10 %)

                                                  = 100 % - 77.47 %

                                                  = 22.53 %

The percent of potassium in total percent of compound is 22.5 %.

Thus, a compound contains 39.37% chromium, 38.10% oxygen, and potassium. percentage of the compound is potassium is 22.53 %.

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A radioactive source's half-life is 8 hours if 60 g of it drops voluntarily to 15 g in 16 hours.

What are radioisotopes, and how are their radioactivity levels determined?

The number of protons in the atomic nuclei of the constituent atoms of a given chemical is constant, whereas the number of neutrons changes. Radioisotopes are the name for an element's radioactive constituents. They can also be referred to as unstable neutron-proton pairings or atoms with too much electrical energy in their nucleus. The Contributes to the continuing (Bq), the international unit, or the Cobalt (Ci), the official machine in the United States, are used to report actual radiation levels.

Complete life divided by half.

Half-life equals 16/2

8 hours is the half-life.

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The partial pressure of gas B is 5.2 atm.

What do you understand by partial pressure?

When more than one gas is present in a container, each gas exerts pressure, which is known as partial pressure. Its partial pressure refers to the pressure of any gas inside the container.

Let there be n different gases in the mixture, each at a different pressure (P1, P2, etc.)

Then the total pressure will be:

[tex]P_{total}[/tex] = ∑[tex]P_{1}[/tex] + [tex]P_{2}[/tex] + [tex]P_{3}[/tex]

Now, partial pressure of mixture of gas containing gas A = [tex]P_{A}[/tex]

         partial pressure of mixture of gas containing gas B = [tex]P_{B}[/tex]

Total pressure of gas = 5.60 atm

Pressure of gas [tex]P_{A}[/tex] = 0.40 atm

[tex]P_{total}[/tex] = [tex]P_{A}[/tex] + [tex]P_{B}[/tex]

5.60 atm = 0.40 atm + [tex]P_{B}[/tex]

[tex]P_{B}[/tex] = 5.60 - 0.40 = 5.2 atm

So, the partial pressure of gas B is 5.2 atm.

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Answer:

10 pts

Explanation:

61.1 grams of sodium chloride.

Molar concentration is a unit of measurement for the concentration of a chemical species, specifically a solute, in a solution, expressed as the amount of substance per unit volume of solution. The most commonly used unit for molarity in chemistry is the number of moles per liter, denoted by the unit symbol mol/L or mol/dm³ in SI units.

Molarity (M) is the most commonly used unit of solution concentration and is defined as the amount of solute in moles divided by the volume of solution in liters:

M = moles of solute/liters of solution.

A mole is a unit of measurement for a chemical substance, from which the term "molarity" derives.

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Above 0.115eV from fermi level conduction level is there.

[tex]\begin{aligned}& \eta=3 \times 10^{17} \\& N_c=4.82 \times 10^{15}\left(\frac{m_n}{m}\right)^{3 / 2} T^{3 / 2} \\& N_c=4.82 \times 10^{15} \times(300)^{3 / 2} \quad\left[\because \frac{m n}{m}=1\right] \\& N_c=4.82 \times 10^{15} \times(300)^{3 / n} \quad \\& N_c=250.45 \times 10^{17}\end{aligned}[/tex]

[tex]\begin{aligned}& E_C-E_F=0.026 \ln \left(\frac{250.45}{3}\right) \\& E_C-E_F=0.026 \times 4.42 \\& E_C-E_F=0.115 \mathrm{ev} . \\& E_C=E_F+0.115 \mathrm{VN}\end{aligned}[/tex]

Above 0.115eV from fermi level conduction level is there.

The Fermi Level is the maximum energy level an electron may occupy when it is at absolute zero degrees Fahrenheit. Since the electrons are all in the lowest energy state at absolute zero, the Fermi level is located between the valence band and conduction band.

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If 1.0 l of solution contains exactly 1 molecule of the solute. The concentration in the solution is 1.66x10-24 M.

The quantity of a substance, like salt, that is present in a specific volume of tissues or liquid, like blood, according to science. When there is less water present, the material becomes more concentrated. For instance, when a person will not really drink enough water, the concentration of salt in their urine may increase.

Why is it so crucial to focus? You can use your resources more effectively and address difficulties more effectively when you are focused. It is less probable that you would overlook crucial facts when you are focused. Maintaining focus makes it easier for you to recall information.

1 mole = 6.02x10^23 particles,

((1 mole)/(6.02x10^23 molecules))

(1 molecule)/((1 mole)/(6.02x10^23 molecules))

= 1.66x10^-24 moles

=1.66x10^-24 moles/ volume,

= 1.0L here:

=(1.66x10^-24 moles solute)/(1.0 Liter)

= 1.66x10^-24 molar,

= 1.66x10^-24 M

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The true statements are 1, 3, 4 and 5 for the properties of atom and molecules.

1. The statement is true:

2. The statement is false.

3. The statement is true.

4. The statement is true.

5. The statement is true.

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The equilibrium that eventually results if a solid is placed in an initially evacuated closed container and is maintained at a given temperature: Thermal equilibrium exists because the solid attains the temperature.

Equilibrium does no longer necessarily imply that reactants and merchandise are present in the same amounts. It approaches that the response has reached a factor in which the concentrations of the reactant and product are unchanging with time due to the fact the ahead and backward reactions have identical charges.

The equilibrium rule says that if a system is in equilibrium then the sum of all of the forces or the net pressure appearing at the machine is 0 due to which the system does now not reveal any linear acceleration and stays at relaxation or moves with a steady velocity. we can write it down as ∑F=zero.

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The aromatic compound benzene, with the chemical formula C6H6, is one of the most well-known ones.

Benzene has a mass average of roughly 78.112, and its chemical formula is C6H6, meaning it comprises six carbon atoms and six hydrogen atoms. Three double bonds and a six-carbon ring, symbolized by a hexagon, are present in the structure. A corner that is bonded to other atoms represents the carbon atoms.

Structure of Benzene

Benzene is typically depicted structurally as a six-carbon ring with three double bonds (shown by a hexagon). Every carbon atom that a corner represents is also connected to one other atom. These are hydrogen atoms that are present in benzene. We can identify the arrangement as including conjugated double bonds since the double bonds are separated by single bonds.

An alternative representation of the six pi electrons employs a circle inside a hexagon. These symbols all have positive and negative qualities. The three double bond symbol will be used simply because it is frequently used in the text.

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When two oxygen atoms form a chemical bond in a system its energy decreases and stability increases.

When two atoms join together to form a chemical bond, they either transfer or share electrons to create a new molecule. The negatively charged particles known as electrons are found in various energy levels around the atomic nucleus.

The outer electrons of two oxygen atoms are drawn in by the nuclei of both atoms when they are in close proximity to one another. Two electrons from each atom are shared in this situation. An example of this is a double bond. Each oxygen atom contains a total of eight valence electrons because they share two pairs of them. Its outer energy level is filled, providing it the most stable configuration of electrons. In its simplest form, oxygen is a diatomic molecule. Since each oxygen only contains six electrons, it must share them with another oxygen to form two bonds. An example of this is a double bond.

Thus, When two oxygen atoms form a chemical bond in a system its energy decreases and stability increases.

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The percent yield of HCl is 85.0%.

In chemistry, yield, also referred to as reaction yield, is a measure of the quantity of moles of a product formed in relation to the reactant consumed, obtained in a chemical reaction, usually expressed as a percentage.

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

The presence of impurities lowers the actual yield, which lowers the percentage yield. The purity of the reactants influences the percentage yield. Highly pure reactants tend to increase actual yield and, as a result, percentage yield.

A percentage yield greater than 100 percent is only possible if the product is contaminated with impurities or if all of the solvent from the reaction mixture has not been dried off.

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When S is negative, entropy falls The entropy change during the suggested synthesis of solid nitrogen can be predicted.

What is entropy, in the simplest possible terms?

Lower entropy can be viewed as an approximate measure of energy quality, with higher quality being associated with lower entropy. Lower entropy energy is structured for storage (the efficient library). Energy is chaotically stored in the random-pile library, which has a high entropy.

What Does Entropy Mean in Real Life?

Every aspect of daily life is impacted by entropy, which measures disorder. Actually, you might think of it as nature's tax. If left uncontrolled, disorder worsens over time. Chaos results from energy dissipation in systems. As something becomes more disorderly,

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The list the addition reactions of alkenes and alkynes are as follows:

Addition Reactions of Alkenes:

1. Halogenation: Alkenes react with halogens to form halohydrins.

2. Hydration: Alkenes react with water to form alcohols in the presence of an acid catalyst.

3. Hydrohalogenation: Alkenes react with hydrogen halides to form alkyl halides.

4. Hydrogenation: Alkenes react with hydrogen in the presence of a metal catalyst to form alkanes.

5. Hydroboration-Oxidation: Alkenes react with borane to form alcohols.

Addition Reactions of Alkynes:

1. Halogenation: Alkynes react with halogens to form dihalides.

2. Hydration: Alkynes react with water to form ketones in the presence of an acid catalyst.

3. Hydrohalogenation: Alkynes react with hydrogen halides to form alkyl halides.

4. Hydrogenation: Alkynes react with hydrogen in the presence of a metal catalyst to form alkanes.

5. Hydroboration-Oxidation: Alkynes react with borane to form aldehydes.

Similarities: Both alkenes and alkynes undergo the same types of addition reactions.

Differences: The products of the addition reactions are different depending on the type of compound being reacted. For example, alkenes form alcohols when reacted with water, while alkynes form ketones.

What do you mean by Alkynes?

Alkynes are a group of hydrocarbons that contain at least one triple bond between two carbon atoms. They are also known as acetylenes and are unsaturated hydrocarbons with the general chemical formula of CnH2n-2.

What do you mean by Alkenes?

Alkenes are a class of hydrocarbons characterized by a carbon–carbon double bond. They are typically colorless, flammable, gases or liquids with a sweet odor. Alkenes are a major component of gasoline and are used in the manufacture of plastics and other industrial materials.

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Determine the number of moles of NaOH present, then the number of moles of H2SO4 required to react with 7.97 g of NaOH, and finally, write the correct balanced equation for the reaction. Lastly, determine how much H2SO4 is required to produce 0.25 moles of H2SO4.

you add 100 ml of concentrated H2SO4 to 900 ml of ordinary water. Once you've combined everything, you'll have 2 moles of H2SO4 in 1L of the solution, or 2M H2SO4.

1. To determine how many moles of NaCl you need, multiply the concentration (0.5 mols/Liters) by the desired volume of solution (0.5 Liters). 2. To determine how many grams of solute are required, multiply the moles of NaCl by their molar mass (58.44 g/mol).

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9.35 grams of oxygen can be produced when 15.6g of sulfur trioxide are decomposed.

2SO₃ → 2S + 3O₂

15.6gSO₃ ˣ 1molSO₃ / 80.07gSO₃ ˣ 3molO₂/2molSO₃ˣ32.00gO₂/1molO₂

= 9.35181716g O₂

=9.35g O₂

For a method that chemists employ to quantify quantities in reactions, stoichiometry is a huge word. To connect the reactants and products in reactions, it makes use of the coefficient ratio established by balanced reaction equations.

Calculating the amounts of reactants and products in a chemical process is called stoichiometry. A balanced solution is required!

• Examples of reaction stoichiometry questions concern quantities in reactions. The resources needed to answer this question are currently at our disposal.

We simply need to learn a new approach to put skills like writing chemical formulas, figuring out formula masses, and putting mass, particles, and gas volume into moles into use.

• Mole to Mole Conversions: The Mole Ratio is required.

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The CS₂ molecules has bond order has two and has diamagnetic behaviours.

A volatile liquid with the chemical name carbon disulfide, CS₂ is an organosulfur compound. It is also known as methanedithione, disulfidocarbon, and carbon bisulfide.Sulfur, bromine, lipids, rubber, phosphorus, asphalt, selenium, iodine, and resins can all be dissolved in carbon disulfide. It is frequently employed in the production of flotation agents as well as the purification of single-walled carbon nanotubes. Carbon disulfide is a toxic, combustible, colourless to light yellow, volatile liquid with a pungent odour. It is insoluble in water and has a flash point of -22°F. It sinks because it is denser than water.

Hence, carbon covalently bond with Sulphur to carbon disulphide.

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The structure of 1-methyl cyclohexanol is: shown in Fig 1

The reactions for the preparation of 1-methyl cyclohexanol are summarised as: Fig 2

Here In Fig 2, 1-methyl cyclohexene reacts to give 1-methyl cyclohexanol in the presence of water. It proceeds through acid catalysed hydration.

In the Fig 3 reaction, methylene cyclohexane reacts with water to give 1-methyl cyclohexanol. It proceeds through acid catalysed hydration.

Thus, the possible structures of alkene are depicted as: Fig 4

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