For the chemical reaction H₂ (g) + F₂ (g) → 2 HF (g) ∆H° = -79.2 kJ/mol. What is the molar enthalpy (in kJ/mol) for the reaction 3 H₂ (g) + 3 F₂ (g) → 6 HF (g)

Answer:

1.268 mol CO2

Explanation:

1. Convert 18.1 g C8H18 to moles.

Divide 18.1 g by C8H18's molar mass. C8H18 has a molar mass of (8 x 12.0107) + (18 x 1.008) because there are 8 carbon atoms (which each have a molar mass of 12.0107 g/mol) and 18 hydrogen atoms (which each have a molar mass of 1.008 g/mol).

Molar mass of C8H18: (8 x 12.0107) + (18 x 1.008) = 114.23 g

18.1 g/114.23 g = 0.1585 mol

2. Use the balanced equation to find moles of CO2.

Multiply 0.1585 mol C8H18 by the ratio of moles from the balanced equation. For every 2 moles of C8H18, there are 16 moles of CO2. You can divide moles of C8H18 by 2, its coefficient, and multiply by 16, CO2's coefficient.

0.1585 x 16/2 = 1.268 mol CO2

Option D is correct. DNA contains the bases adenine (A), cytosine (C), guanine (G), and thymine (T) (T). These bases come in particular pairs (A with T, and G with C).

Deoxyribose sugar, a phospate molecule, and one nitrogenous base from adenine, guanine, thymine, and cytosine are all components of the nucleotides that make up DNA strands. Uracil never makes up a DNA nucleotide. A sugar (deoxyribose or ribose), a phosphate, and a nitrogen base make up a nucleotide (uracil, adenine, thymine, guanine, or cytosine). In eukaryotes, histones are utilized to structure DNA; they are not a part of nucleotides. The main form of linkage found in nucleic acids, such as DNA and RNA, is phosphodiesterase linkage. With no phosphodiester connections tying the phosphate to the nearby 3'OH sugar molecule.

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Answer:

The number of methane molecules (CH4) is equal to the number of carbon dioxide molecules (CO2),

Explanation:

Avogadro's number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 10^23. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction (if any).

Therefore, the number of methane molecules (CH4) is equal to the number of carbon dioxide molecules (CO2), which is 6.02214076 × 10^23

A natural resource found in nature that humans use may be coal, which is a non-renewable fossil fuel obtained from the earth's crust.

A natural resource can be defined as any material and or energy obtained from the environment and available to be used to achieve a particular objective.

Natural resource bay be finite such as occurs with fossil fuels (i.e., coal, sedimentary rocks from the earth's crust, natural gases, etc) or also they can be obtained in reversible ways and therefore in an infinite amount (e.g. the energy from the sun or the eolic energy, which are renewable sources of energy)

Therefore, with this data, we can see that a natural resource is any type of piece of matter or also different types of energies that can be renewables and not renewables such as occur with eolic energy and coal, respectively.

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Answer:5

Explanation:

Options b) and d) are correct . In these two cases equilibrium constant is greater than 1.

What hard and soft acids?

Hard acid means which are Small, highly charged (the charge criterion mostly applies to acids, to a lesser extent to bases), and poorly polarizable. Soft applies to species which are big ,have low charge states and are strongly polarizable.

a)  In case of first reaction BF3 is harder acid than BBr3 , so K<1

b) HOC(CH3)3 is harder acid ,so K>1

c) reaction will shift towards reactants side ,so K<1

d) Reaction will shift towards right ,so K>1

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The pressure of the gas is now obtained as 32.7 atm.

We know that the reaction has been shown in the question and we have been asked to be able to obtain the final pressure of the system. We need to obtain the limiting reactant so that we can be able to get the amount of the product that is formed.

If 1 mole of phosphorus reacts with 6 moles of chlorine

0.351 moles of  phosphorus reacts with 0.351 moles * 6 moles/1 mole

= 2.1 moles

Thus chlorine is the limiting reactant.

6 moles of chlorine produces 4 moles of phosphorus trichloride

1.17 moles of chlorine produces 1.17 moles * 4 moles/6 moles

= 0.78 moles

We would now apply the ideal gas equation;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

Then

P = nRT/V

P = 0.78 * 0.082 * 572/1.12

P = 32.7 atm

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Due to the gas within cooling off due to the low temperature, the balloon's volume shrinks.Because helium is lighter than the same volume of air at room temperature, the helium balloon rises.

Boyle's Law: The Relationship Between Pressure and VolumeThe volume of a gas reduces as pressure increases because the gas particles are pushed closer together. The ability of a gas to spread its particles farther apart causes its volume to increase as pressure decreases, in contrast.

The air within the balloon contracts because liquid nitrogen, which is -196 degrees Celsius, cools so quickly.

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Hello,

I hope you and your family are doing well!

To solve this problem, you need to use the ideal gas law, which states that the product of the pressure, volume, and temperature of a gas is a constant. This can be written as:

PV = nRT

where P is the pressure of the gas, V is the volume of the gas, n is the number of moles of the gas, R is the gas constant, and T is the temperature of the gas.

Since the temperature and pressure are the same in both situations, the ratio of the volumes is equal to the ratio of the number of moles of gas:

V1/V2 = n1/n2

Plugging in the known values, we get:

V1/102.8 L = 17.8 mol/64 mol

Solving for V1, we find that the volume of 64 mol of Ar gas at the same temperature and pressure as 17.8 mol of Ar gas is:

V1 = (102.8 L) * (17.8 mol/64 mol) = 43.4 L

Since 1 liter is equal to 1000 milliliters, the volume of 64 mol of Ar gas in milliliters is:

V1 = 43.4 L * 1000 mL/L = 43,400 mL

So 64 mol of Ar gas would occupy 43,400 mL under the same temperature and pressure as 17.8 mol of Ar gas. In scientific notation with 3 significant figures, this is:

43,400 mL = 4.34 x 104 mL

This is the volume that 64 mol of Ar gas would occupy under the same temperature and pressure as 17.8 mol of Ar gas.

---

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Explanation:

17.8 Mole = 102.8 L

1 Mole = 102.8÷17.8 L

=5.775 L

so

64 Mol occupy 64× 5.775 L

=369.6 L

we Know,

1L = 1000Ml

369.6 L =. 369.6 × 1000 ML

= 369600

= 369.6 × 10 ^3

a. A compound of the elements hydrogen, carbon, and oxygen, carbonic acid, (H2CO3).

b. In lucidity:

The first stage alone never entirely ionizes carbonic acid (H2CO3).

It splits into H+ and HCO3- ions in part.

It has a low dissociation constant because to its partial dissociation, making it a weak acid.

H2CO3 = H + (+) H CO3-

H+ (+) (CO3)2- = HCO3-

On the product side of these equilibrium processes, [H+] rises. Therefore, according to the Le Chatlier principle, the reaction has a tendency to proceed backward, which prevents the acid from entirely dissociating. Carbonic acid is a weak acid as a result.

c. A polyatomic ion having the formula CO3 is called a carbonate ion (2-). A carbon oxoanion is carbonate. It is a hydrogencarbonate's conjugate base.

[CO3 -2] = K2 [HCO3-] / [H+], where K2 is the second dissociation constant for carbonic acid, is the equation for carbonate concentration.

what is Carbonic Acid?

The chemical compound of hydrogen, carbon, and oxygen is known as carbonic acid (H2CO3). It is created in trace amounts when carbon dioxide (CO2), its anhydride, dissolves in water.

CO2 + H2O = H2CO3.

Simple CO2 molecules that are lightly hydrated are the main species. It is possible to think of carbonic acid as a diprotic acid from which two groups of salts can be produced: hydrogen carbonates, which include HCO3, and carbonates, which contain CO32.

H3O+ + HCO3 = H2CO3 + H2O

H2O+ + CO32 = HCO3 + H2O

However, the varying speeds of certain of the relevant processes as well as their dependency on the system's pH play a role in the acid-base behavior of carbonic acid. For instance, the main reactions and their corresponding relative speeds at a pH lower than 8 are as follows:

CO2 + H2O = H2CO3 (slow)

HCO3 + H2O + H2CO3 + OH (fast)

The following reactions are significant above pH 10:

HCO3 = CO2 + OH (slow)

CO32 + H2O + HCO3 + OH (fast)

All of the aforementioned equilibrium reactions are significant between pH levels of 8 and 10.

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The name of the given compound is carbonic acid. It is weak acid which does not dissociate completely.

The inorganic substance carbonic acid has the chemical formula H2CO3. Contrary to popular assumption, the molecule is quite stable at room temperature in the absence of water, when it quickly breaks down into water and carbon dioxide.

CO2 + H2O = H2CO3

The predominant species consists of simple, weakly hydrated CO2 molecules. It is feasible to think of carbonic acid like a diprotic acid from which two categories of salts can be created: carbonates, which contain CO32, and hydrogen carbonates, which include HCO3.

[tex]H_{3}O^{+} + HCO_{3} = H_{2} CO_{3} + H_{2}O[/tex]

[tex]H_{2}O^{+} + (CO_{3}) _{2} = HCO_{3} + H_{2}O[/tex]

To answer the given questions-

a) The name of the compound [tex]H_{2}CO_{3}[/tex] is carbonic acid.

b) Carbonic acid is never completely ionized in the first stage alone. It partially separates into H+ and HCO3- ions. Due to its partial dissociation, it has a low dissociation constant, which makes it a weak acid.

[tex]H_{2}CO_{3} = H^{+} + HCO_{3} ^{-}[/tex]

[tex]H^{+} + (CO_{3}) ^{2-} = HCO_{3} ^{-}[/tex]

[H+] increases on the product side of these equilibrium processes. In light of this, the Le Chatlier principle states that the reaction has a propensity to go backward, preventing the acid from completely dissociating. Therefore, carbonic acid can be said as a weak acid.

c) [tex]CO_{3} ^{2-}[/tex] is the carbonate ion. It is the most basic oxocarbon anion that breaks down when heated and is often insoluble in water.

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A radical is a reactive intermediate with a single unpaired electron, formed by homolysis of a covalent bond.

Most organic transformations involve the movement of electron pairs (heterolytic reactions). There are a few important addition reactions, however, in which the electron reconfiguration involves the movement of singleelectrons.

Whereas heterolytic bond cleavage leads to ion pairs,  homolytic bond cleavage results in unpaired electrons – or free radicals.

Some weak bonds have a tendency to fragment homolytically (e.g., peroxides, halogens). Chemists use a slight variation of curved arrow notation to show the movement of single electrons. For single electron  movement, “fishhook” arrows, i.e., single headed arrows are drawn.

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The correct order is: Revolution> Solar day> Rotation> Period of daylight or darkness.

Revolution:

According to the stars, the Earth orbits the sun in 365 days, 6 hours, and 9 minutes, rotating at a speed between 29.29 and 30.29 km/s. Every fourth year, which is known as a leap year, the 6 hours, 9 minutes add up to roughly one extra day. The extra day added is February 29th.

Solar Day:

A solar day lasts roughly 24 hours on Earth. The Earth's orbit is not a perfect circle because it is elliptical. This implies that certain solar days on Earth are somewhat longer than 24 hours and some are slightly shorter.

Rotation:

The Earth has an inclination of 23.45 degrees from the plane of its orbit around the sun, and revolves on its axis in relation to the sun every 24.0 hours mean solar time. The differences brought on by the non-circular orbit of the Earth are averaged out to create mean solar time.

Period of daylight:

At the equator, day and night are always twelve hours long, with the exception of two tiny effects that lengthen day by roughly eight minutes.

Hence the order is Revolution> Solar day> Rotation> Period of daylight or darkness.

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Answer:

If it is elemental gas, the oxidation number is $$0$$.

Explanation:

The oxidation number of an atom in a chemical bond, is the charge left on the atom

There are sixteen lone pairs in the molecule and two bond pairs in the molecule. The compound has a tetrahedral  electron geometry but the shape is bent. The compound is polar.

The compound that is under consideration is selenium dichloride. In this compound, we have one atom of selenium and then two atoms of chlorine. The accurate and correct Lewis structure of the compound have been shown in the image that is attached to this answer.

In that structure, we can see the number of valence electrons that can be found in the compound and some of the electrons are lone pairs while the other valence electrons can be seen to be bond pairs.

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We will be using the q = m*c*(delta T) equation, which is also known as Specific Heat formula. So our answer will be 21,410 Joules or you can say 21.41 kJ kilojoules (amount of heat required by hexane).

q = m*c*(delta T)

We have to convert this temperature, which is given to us in Celsius, into Kelvins by adding 273.15.

Kelvin = Celsius + 273.15

Kelvin = 48.1 C + 273.15

(K = 321.25 K).

now, delta T is the change in temp. (final temperature minus the initial temperature). so, delta T will be 321.15k-274.15 K.

combine the values and solve,

q = (0.197 kg)*(2.26J/kg*K)*(321.25 K-274.15 K)

q= 21.41kJ.

Specific heat formula given by, Joseph Black. The Scottish scientist Joseph Black, noticed that equal masses of different substances needed different amounts of heat to raise them through the same temperature interval, and, from this observation, he founded the concept of specific heat.

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The volume (in mL) of 4.67 M solution of nitric acid needed to make 250.0 mL of a 1.10 M solution of nitric acid is 58.9 mL

We understood that the volume of diluted substance can be obtained by using the following formula:

M₁V₁ = M₂V₂

Where

With above formula, we obtain the volume (in mL) of nitric acid needed to make 250.0 mL of a 1.10 M solution of nitric acid. Details below

M₁V₁ = M₂V₂

4.67 × V₁ = 1.10 × 250

Divide bioth sides by 4.67

V₁ = (1.10 × 250) / 4.67

V₁ = 58.9 mL

Thus, we can conclude from the above calculation that the volume (in mL) needed is 58.9 mL

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The heat change (in J) in the reaction is -8403.6 J.

The heat change of a reaction is the heat that is given off or absorbed in the reaction when product molecules are formed by reactant molecules.

In a reaction where heat is absorbed during the formation of products, the heat change is positive and the reaction is said to be endothermic.

On the other hand, in a reaction where heat is given off during the formation of products, the heat change is negative and the reaction is said to be exothermic.

The heat change of the reaction is calculated below:

Heat change = mass * heat capacity * temperature change

mass of mixture = 45. 5 + 55.5

mass of mixture = 100 g

Heat change = 100 * 5.64 * (5.6 - 20.5)

Heat change = -8403.6 J

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The concentration of chloride ion in the sample of seawater in ppm is 1940 ppm.

The concentration of a substance in ppm means concentration in parts per million.

Concentration in parts per million, ppm, is equivalent to a concentration of mg/L.

The concentration of chloride ion in the sample of seawater = 1.94 %

A percentage w/v concentration of 1.94 % = 1.94 g/L of solution.

To convert this concentration in grams per liter to mg per liter, we do the following:

1 g = 1000 mg

Hence, 1.94 g = 1940 mg

Hence, the concentration in parts per million = 1940 mg/L or ppm.

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A radical is a reactive intermediate with a single unpaired electron, formed by homolysis of a covalent bond.

When two or more atoms interchange one or more pair of electrons, a covalent connection is created. These electrons are simultaneously being drawn to the two nuclei. A covalent bond is created when the difference between electronegativity values of the two atoms is too small for an electron transfer to occur and produce ions.

Two atoms share an electron pair in a covalent link, a type of chemical bond. The covalent link is also known as a molecular bond. Covalent bonding is the force of attraction or repulsion between two atoms when they share a pair of electrons or a bonding pair.

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The complete question is -

Select the keyword or phrase that will best complete each sentence.

Key word - paired, unpaired

A radical is a reactive intermediate with a single unpaired electron, formed by homolysis of a covalent bond.

Because the molecules are the same except for the C4 position, D-glucose and D-galactose are epimers. Both structural isomers of glucose and fructose share the chemical formula C6H12O6.

Mannose is a sugar monomer from the aldohexose group of carbohydrates and a C-2 epimer of glucose. Mannose plays a crucial role in human metabolism, notably in ensuring that native proteins are correctly glycosylated.

They belong to a particular class of stereoisomers that feature several stereocenters but vary from one another based on the arrangement of a single stereogenic center. Mannose and glucose differ from one another in terms of their conformation at the C-2 atom. Consequently, they are epimers.

Epimers of D-glucose include D-mannose and D-galactose.

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4.78 × 10^-19 J.

To find the energy of the emitted photon, we can use the formula E = hc÷λ. where E is the energy, h is the Planck constant, c is the speed of light, and λ is the wavelength of the radiation. Plugging in the given values ​​gives:

E = (6.626 × 10^-34 Js)(2.998 × 10^8 m/s)/(5.40 × 10^2 nm)

= 4.78 × 10^-19 J

So the energy of the photon being emitted is 4.78 × 10^-19 J.

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A mole is defined as the quantity of a material that includes precisely of the substance's elementary entities.

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Answer: 4

Explanation:

Filter feeders include daphnia.The setose thoracic legs function as sieves to remove detritus, germs, and algae from the water.Before food enters the gut for digestion, daphnia transfer this to the mouth and grind it with their mandibles.Food retention lasts for between one and three hours.

It is well known that high temperatures or anoxic conditions, which result in low oxygen levels, increase the heart rate of daphnia(34) (9).

The rate of physiological processes and chemical reactions inside the organism accelerates as body temperature rises.The rate of cellular respiration accelerates, increasing the need for oxygen and the output of carbon dioxide.This calls for the heart, which pumps blood, to beat more quickly.

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The transition metal coordination complexes [NiCl4]2- and [Co(H2O)]3+ have the highest and lowest d electron counts, respectively. [Fe(OH2)] 3+, [MnO4]-.

An electron is a subatomic particle with a negative charge that can be either free or bonded to an atom (not bound). An atom has three different sorts of constituents, two of which are particles and one of which is an electron that is bound to it.

The parts of an atom with negative charges are referred to as electrons. The charge of an atom's proton in the nucleus is balanced by the total negative charge of the atom's electrons.

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Answer:

can be seperated using filtration then evaporation

Explanation:

By dividing the specified mass by the molar mass of NaCl N a C l, which is: =58.44 g/mol, we may accomplish this.

Molecules per liter, or mol/L, are used to measure molarity. A 0.30 M NaCl solution has 0.30 mol of sodium chloride per liter of fluid. Making solutions is a common task for chemists, thus performing the calculations required to create a specific volume of solution is instinctive. Sodium chloride has a molar mass of 58.5 grams. 0.085 moles of sodium chloride make up one mole. The solution is thought to have a volume of 100mL, or 0.1L. Hence, the 5% saline molarity. Therefore, we must ascertain the NaCl N a C l's equivalent number of moles in order to obtain the molarity.

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All listed options are valid exceptions to the octet rule.

Some elements, such as boron (B) and beryllium (Be), may have incomplete octets.

Some elements, such as aluminum (Al) and chlorine (Cl), can have extended octets if they are in the third period or below in the periodic table.

Hydrogen (H) usually don't follow the octet rule because they usually only want to have two valence electrons.

Carbon (C) can have up to 12 valence electrons under certain circumstances. For instance, When forming aromatic compounds or forming covalent bonds with other elements with high electron demand.

Overall, the octet convention is a general guideline and not strictly followed by all elements. There are many exceptions to this rule, and some elements may deviate from the octet rule to achieve more stable electronic configurations.

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The formal charge of (CH3)3NO by considering its resonance Oxygen, -1; Nitrogen, +1.

How to calculation formal charge?

The hypothetical charge that an atom in a molecule would have if the electrons in the bonds were distributed uniformly among the atoms is known as the formal charge. Another way to state this is that formal charge is created by subtracting the nonbonding electrons from the amount of valence electrons on a neutral atom, followed by the number of bonds that connect that atom to other atoms in the Lewis structure.

As a result, we determine formal charge as follows:

Formal charge:= # electrons in the free valence shell of the atom,- # lone pair electrons, -1/2 # bonding electrons.

By calculating the formal charges for the entire structure, we can double-check our results. The total formal charge of every atom in a molecule must be zero, and the total formal charge of an ion must be equal to the ion's charge.

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He must do to these two numbers to find number of iron atoms in the  sample by multiplying them.

Avogadro's number can be multiplied or divided to convert between molecules and moles: Adding 6.02 x 10²³ o the number of moles will convert it to molecules. Divide the number of molecules by 6.02 x 10²³ to get the equivalent number of moles.

One of the basic constants in chemistry is the Avogadro's number. When the same number of atoms or molecules are being compared, it allows comparison of the various atoms or molecules of the given substances.

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The Magnesium atom with very little electron density attracts the Oxygen side of the water which has a partial negative charge.

What is oxygen?

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