when 70.0 g of li3n(s) reacts with excess h2(g), 8.0 g of linh2 (s) is produced. the percent yield is closest to

it false john weighs 85 pounds. jeff weighs 105 pounds. jake weighs 115 pounds. two of them standing together on the same scale could weigh 200 pounds.

A pounds is defined as 16 ounces, 7,000 grains (or 0.45359237 kg) of avoirdupois weight and 12 ounces, 5,760 grains (or 0.37324171216 kg) of troy and apothecaries' weight. The letter lb comes from the Roman libra, which was the forerunner of the modern pound. The pound, also known as pound-mass, is a unit of mass that is used in both the British imperial and American customary measurement systems.

Balance Analytical These are most frequently discovered in laboratories or other locations where weighing items requires a high level of sensitivity. In analytical balances, mass is measured. Chemical analysis is always based on mass, so the results are never based on localized gravity, which would have an impact on the weight.

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8 acetyl-CoA molecule, 7 NADH molecules, with 7 FADH2 molecules are produced as a result of this.

Coal, gasses, and hydrocarbons are all utilized as fuels.  It is used to create a variety of products, including plastic and steel alloys (a combination of carbon and iron). Even black ink for computers and painting is produced with it.

The nucleus of a carbon atom is made up of six protons and six neutrons, and it is encased in six electrons. According to quantum physics, the first excited elements must occupy the innermost atomic orbit, while the wavefunctions of the following four electrons only partially fill the ii standard and 2 minute primary orbitals.

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According to the given statement The solubility product Ksp of the salt at 25 °c is 6.31 x 10–6 .

The equilibrium characteristic for the dissolution of a solid into an aqueous solution is known as the solubility product constant, abbreviated KSP or the Product In a particular. It is represented by Ksp. The solubility product, a sort of equilibrium variable, varies in value with temperature.

Since 1.0 mol of the solid salt creates 1.0 mol of A+3 ion (cation) after dissolving in water, 0.022 mols of the salt will result in 0.022 mols of A+3 (direct proportion). [A+3] = 0.022 mols/liter, or 0.022 M, follows.

On the other hand, 3 mols of the B- anion will be produced from 1 mol of the solid salt. As a result, also by direct proportion, 3 x 0.022 = 0.066 mol of B- will be produced from 0.022 mols of the solid salt. Consequently, [B-] = 0.066 M

The Solubility Product, Ksp will finally be:

Ksp = [A+] [B– ]^3 = [0.022] [0.066]^3

So, Ksp = 6.31 x 10–6

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Molecular solid is a covalent bond and  Ionic solid is an electronic bond.

We employ the octet rule, which states that all atoms in a compound are expected to comply by, to confirm the accuracy of any chemical structure. Every atom in the carbon IV oxide model precisely complies with the octet rule. The valence shell of each atom in the molecule is surrounded by eight electrons. We can therefore conclude that this structure is accurate given the total number of bonds and electrons, as well as the fact that CO2 has sixteen valence electrons.

Its negative charge, which is 1.602176634 coulombs, the basic unit of electric charge, is comparable to its own negative charge. The rest mass of an electron is 9.1093837015 10-31 kg, or 1/1,836 the mass of a proton.

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4-Dimethylaminopyridine is the extended form of DMAP in chemistry. It boils at a temperature of roughly 162 degrees Celsius. A very little over 122 g/mol is the molecular weight.

What is nucleophilic substitution reaction?

When an electron-rich nucleophile replaces a leaving group by coming into touch with a positively charged electrophile, the process is known as a nucleophilic substitution reaction.

Explanation:

Step 1: DMAP and acetic anhydride initially react in a state of pre-equilibrium.

Acetate and acetyl pyridinium ion pair are produced in the first step of the reaction. They both have high resonance stabilization.

Highly electronegative oxygen delocalizes in a structure with equal resonance energy.

Step 2:

DMAP is removed in the second stage when the alcohol that is present combines with the acyl carbon of the acetyl pyridinium to form the ester.

Acetate acts as a base to remove the proton from the alcohol by nucleophilically adding to the activated acyl pyridinium. The catalyst and the ester are produced as a result of the acetyl group's break with the catalyst. The resulting acetic acid will subsequently protonate the DMAP.

Step 3:

In the final stage of the catalytic cycle, the auxiliary base (unusual triethylamine Et N:or pyridine) deprotonated the protonate DMAP, reforming catalysis. The idea of a DMAP-dependent reaction rate is defined by catalepsies.

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We use for fuel are hydrocarbons that burn easily in the presence of oxygen, Hydrogen and Carbon elements are found in these substances. These fossil fuels are found in the Earth’s crust and contain carbon and hydrogen, which can be burned for energy.

What is fossil fuel?

Fossil fuel is a hydrocarbon-containing substance formed naturally in the Earth's scab from the escapes of dead plants and animals that is liquid and burned as fuel. The major fossil fuels are coal, oil, and natural gas.

What is energy?

Energy is the quantitative possession that is changed to a body or to a physical system, identifiable in the performance of work and in the form of heat and light.

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Answer:

650cm

Explanation:

1m = 100cm

6.50m = 650cm

The carbonic hardness is 131.1475 mg/L, non carbonic hardness is 243.442 mg/L and total hardness is 345.833 mg/L.

Anions - they're shaped when non-metal profits the electrons. They benefit one or a couple of electron. consequently, they own a net poor price. a few examples of anions are Iodide (I–), chloride (Cl–), hydroxide (OH–).

Calculation:-

Total hardness - is sue to multivalent cations.

The multivalent cations in the given questions are Ca²+ and Mg ²+.

= 237.5 + 108.33

= 345.833 mg/L of CaCo3.

Carbonceous hardness - is due to HCO3-

Therefore carbonaceous = 160/60/1 (100/2) as CaCO3

= 131.1475 mg/L

Non carbonaceous hardness - is due ti cl- and SO4- anions.

= 135/96/2 × 100/2

= 243.442 mg/L as CaCo3.

Carbonate is a polyatomic anion with the components CO2−3 and has a trigonal planar molecular shape which includes a carbon atom surrounded via 3 oxygen atoms. The carbonate ion is a reasonably sturdy base, so through definition of a Lewis base, it draws protons in aqueous solutions.

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Aqueous solutions of sodium sulfate ( Na₂SO₄ ) and barium chloride are mixed, then the precipitate formed is barium sulphate ( BaSO₄ ). Therefore, option 4 is correct.

The inorganic substance having the chemical formula BaSO4 is called barium sulfate. It is a tasteless, crystalline white substance that is insoluble in water. The main commercial source of barium and the materials made from it is the mineral barite, which is where it naturally occurs.

Barium sulfate and sodium chloride are created when barium chloride (BaCl2) and sodium sulfate (Na2SO4) react. The above-mentioned reaction produces a white precipitate as a result of the creation of barium sulphate.

Thus, option 4 is correct,

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It is acidic shampoo. Not basic, but in between acidic and neutral. Because basic shampoo would be harmful in this situation. The basic ph of soap is incorrect.

Once or twice will not harm your hair when you wash it with soap, but frequent washings with bar soap can lead to serious issues including roughness and severe tangles. Choose a shampoo instead to clean your hair. Dry shampoo is an excellent option for your hair if you wish to forgo shampoo.

You can wash your hair with soap, but if you're used to using liquid shampoo, the results will probably not be satisfactory.

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The conditions that cause hail to fall are unstable air that move water droplets through layers of warm and freezing air repeatedly. Therefore, option A is correct.

The temperature determines whether water vapor will condense into droplets. The dew point is the temperature at which droplets begin to form. The atmospheric water vapor condenses to create tiny droplets on the surface when the temperature of the surface falls until it eventually reaches the dew point.

When a water droplet is lifted by an updraft from a thunderstorm over the freezing point of the atmosphere, hail is created. The super-cooled water or water vapor that the frozen water droplet accretes later freezes when it comes into contact with it. A hailstone grows as a result of this process.

Thus, option A is correct.

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Answer:

Explanation:

unstable air that move water droplets through layers of warm and freezing air repeatedly

Molecular formula=n×(empirical formula)

We take the given empirical formula, work out its mass, and then solve for n.

And thus the molecular formula ≡ (CH)6 or C6H6.

What is a chemical compound?

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Both Na and K use passive diffusion across the plasma membrane to leak channels.

The plasma membrane, also known as the cell membrane, is the membrane that separates the interior of a cell from its external environment. It may be found in all types of cells. A cell wall connects the plasma membrane to the outside of both bacterial and plant cells. The plasma membrane protects the cell from its surroundings while simultaneously controlling cellular mobility and sending signals. The plasma membrane, according to the fluid mosaic model, is a patchwork of phospholipids. Non-gated ion channels are ones that are always open. Because they simply allow ions to pass through the channel without causing any damage.

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The balanced chemical reaction for the complete neutralization between HNO₃ and Ba(OH)₂ is given as,

2 HNO₃ (aq) + Ba(OH)₂ (aq) → Ba(NO₃)₂ + 2 H₂O

Balanced equations

In order to balance the equation, the component atoms in the reactants and products must be the same in terms of number and mass.

Thus, in the above chemical equation, the number atoms of H, N, O, and Ba in the reactants and the products must be equal.

Therefore, the overall equation for the chemical reaction is,

2 HNO₃ (aq) + Ba(OH)₂ (aq) → Ba(NO₃)₂ + 2 H₂O

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According to VSEPR theory the shape of the molecule is trigonal bipyramidal.

The VSEPR theory postulates that the shape of a molecule can be predicted by the electron pairs that surround the central atoms of the molecule. The valence shell electron pair repulsion (VSEPR) uses 3-D molecular geometry.

The VSEPR is a geometry that minimizes repulsion between electrons. The shape of the molecule is "trigonal bipyramidal" because of the presence of 2 single bonds in the X atom atom attached to the Y atom. The 5 main shapes of VSEPR are linear, trigonal planar, tetrahedral, trigonal bipyramidal and octahedral.

The full question is:

A Lewis structure is a two-dimensional representation of a molecule that does not necessarily show what shape that molecule would take in three dimensions. From the given Lewis structure and what you know about VSEPR theory, identify the shape of the molecule. A molecule with atom Y single bonded with 2 X substituents. The Y atom has two lone pairs.

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In part A, the statement that incorrectly describes air masses is option C, Polar air masses form far from the equator where air becomes cool as it loses energy to the cold land or water.

Part B, the option that does not apply to the weather change if a cold front moves into an area at a front is option C, Rain is unlikely.

When boundaries between air masses or cold fronts moves they cause changes to the weather, wind becomes gusty, heavy rain that sometimes come with hails and thunder as well as drop in temperature occurs.

Polar air masses are known to form only in areas with high latitudes and near the equator.

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The molarity of a 97.62 (m/m) % acetic acid solution given that the solution density is 1.05 g/ml is 17.5M.

Reason:

Glacial acetic acid is 100% acetic acid. The MW of acetic acid is 60. The density of acetic acid (100%) is 1.05. So in 1 L we have 1.05 Kg. The number of moles of acetic acid is then 1050 g divided by 60 = 17.5 mol. So the molarity is 17.5 mold/L or 17.5 M.

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Potassium is positively charged inside the cell, sodium is positively charged outside the cell, phosphate is negatively charged inside the cell, and chloride is negatively charged outside the cell.

Blood clotting, muscular movements, acid equilibrium, and fluid control can all be affected when your body is low on electrolytes. Electrolytes aid in the regulation of your heartbeat because your heartbeat is a muscle.

Drinks like isotonic drinks, milk, apple juice, other juice drinks can all help with electrolyte balance and hydration. For the majority of people, maintaining electrolyte levels only necessitates a well-balanced diet and enough water to drink.

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Benzodiazepine is taken for GAD. The least likely description would likely to apply to Ingeborg’s reaction is: C. Therapeutic effects may be no stronger than those obtained with a placebo.

Both benzodiazepine and placebo could help in treating GAD and other panic disorders in adults. Their therapeutic effects include anxiety reduction, maintenance of sleep, seizure prevention, and muscle relaxation. However, many authors and researchers agree that benzodiazepines are more effective and have a stronger effect than placebo. Therefore, the correct answer is C.

This question seems incomplete. The complete options of the query are as follows:

“Ingeborg is taking a benzodiazepine for GAD. Which description is least likely to apply to Ingerborg’s reaction?

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Assuming there are no other changes to the system, the change in internal energy is 0 joules.

This is because the internal energy of a system is a measure of the total amount of energy stored within the system. If there are no changes to the system, then the amount of energy stored in the system remains the same and thus the change in internal energy is 0 joules.

Is a unit of measurement used to determine the total amount of energy stored within a system. This amount of energy varies depending on the work done in the system, as well as the transferred between the system and its environment. When dealing with a closed system, i.e., a system that is not affected by any external change, the change in internal energy is zero.

This is because in a closed system, there is no work done and no heat transferred to the system. This means that the total amount of energy stored within the system does not change, so the change in internal energy is zero.

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Carbon Dioxide

Force: London

Sublime: -78.5 C

Hydrogen Fluoride

Force: dipole-dipole

Sublime: 19 C

Calcium Chloride

Force: ionic

Sublime: cannot sublime

Naphthalene

Force: London

Sublime: 80 C

Water

Force: hydrogen bond

Sublime:  0

When the temperature is 5 k and there are 2 molecules per cm3, the pressure is 1.38*1016 Nm2.

What degree of heat is too much for people?

People frequently cite a 2010 study that concluded that the highest limit of safety, above which the human body can no longer cool itself by draining sweat from the body's surface, would be a wet-bulb temperature of 35 C, or 95 F at 100% humidity or 115 F at 50% humidity.

Where on earth is it the hottest?

The world's hottest air temperature was recorded at Death Valley: Temperatures in the California desert's aptly called Furnace Creek region peaked on July 10th, 1913, at

Briefing:

P = nKT/V

 = 2*1.38*10⁻²³*5/10⁻⁶

 = 1.38*10⁻¹⁶ Nm⁻²

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The density of a gas with a molar mass of 28.011gmol at 281 k and 1.90 atm is 2.30 g/l or grams per liter.

The formula for the ideal gas constant is PV= nRT

[tex]\frac{P}{RT}= \frac{n}{V}[/tex] = molarity

[tex]\frac{n}{V}[/tex] = molarity

Using M = molar mass to multiply both sides, we obtain

[tex]\frac{PM}{RT} = \frac{nM}{V}[/tex]

We can write [tex]\frac{PM}{RT}[/tex]= ρ.......equation (i)

since density, ρ = [tex]\frac{mass}{volume}[/tex] and

density, ρ= [tex]molarity*molar mass (\frac{nM}{V})[/tex]

After plugging in all the numbers in equation (i), we get

ρ= [tex]\frac{ 1.90*28.011}{281*0.082}[/tex]

ρ= [tex]\frac{522090}{2304200}[/tex]

ρ= 2.30 g/l.

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If an aqueous solution of lead ( II ) nitrate ( Pb ( NO₃ )₂ ) is mixed with an aqueous solution of potassium chloride ( KCl ) the precipitate is PbCl₂. Therefore, option 5 is correct.

A metal halide salt made of potassium and chlorine is known as potassium chloride (KCl, or potassium salt). It looks like a white or colorless vitreous crystal and has no smell. The material easily dissolves in water, and its solutions taste salty.

Potassium nitrate and lead chloride are produced when aqueous KCl and lead nitrate ( Pb ( NO₃ )₂ ) combine. Because PbCl₂ is soluble in water but precipitates out, the metathesis reaction has taken place.

As a result, option 5 is correct.

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Alkyl bromides are created when an alkene and HBr interact in the presence of factors such as heat, sunshine, or peroxides. A radical intermediate is used in this reaction to progress.

What is Alkene?

Alkenes, and ethene in particular, play a crucial role in the chemical industry. They are created during the cracking of the alkanes but are not present in significant amounts in crude oil. Like all hydrocarbons, alkenes burn in the presence of air to produce carbon dioxide and water. Ethene reacts violently in oxygen, making it ineffective as a fuel. Additionally, the alkenes are too useful for the production of plastics and many other compounds to be used as fuels in the chemical industry.

Compound A reacts with HBr to produce 2-bromohexane as a byproduct. 1-Bromohexane is created when component an interacts with HBr and peroxide.

In the absence of light, the carbocation intermediate is used to add HBr. In the presence of light, the radical intermediate is used to add HBr.

The result of component B reacting with HBr is 1-bromo-1-methylcyclohexane. 1-Bromo-2-methylcyclohexane is produced via the reaction of component b with HBr and peroxide.

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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

1.233×18. 7=n₁×0.0821×298

n₁=0.822 mol

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

P₂.V₂=n₂.R.T₂

1.233×41. 9=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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According to the statement you do every time you are setting up glassware for a vacuum filtration are:

1. Check that there are no cracks or defects in the glassware.

2. Ensure that the glassware is designed for use with a vacuum.

3. Inspect the tubing for any holes.

By removing the air beneath the filter paper, vacuum filtration maintains a pressure differential across the filter media. Filtration under a vacuum accelerates the process and exerts a force on the mixture in addition to gravity.

The collection of a particle (bacteria, precipitate, etc.) from with a liquid suspension typically involves vacuum filtration in microbiological and laboratory operations.

Vacuum and gravity filtering differ primarily in their efficiency and mode of operation. The filtration is powered by one technique, which employs a vacuum source, and by the other, which uses gravity. Vacuum filtering becomes quicker and more practical as a result. However, it doesn't apply to all experiments.

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In addition to the London Dispersion Force, which is Cl2, the molecule or compounds CO, HF, and NaCl also possess additional intermolecular forces of attraction.

a material created through the chemical bonding of two or more distinct components. Compounds include things like water, which is a combination of oxygen and hydrogen and salt, which is a combination of sodium and chloride. Table salt, water, and carbon dioxide are a few examples of compounds.

Covalent bonds hold together molecules, ionic bonds hold together ions, metallic bonds hold together intermetallic compounds, and coordinate covalent bonds hold coordination complexes together. Compounds that are not stoichiometric represent a contentious edge case.

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lewis structure for Hydrogen cyanide (hcn)is H-C≡N:  is based electrons present in molecule

Step 1: Determine the total number of valence electrons. Step 2: Write the skeleton structure of the molecule. Step 3: Use two valence electrons to form each bond in the skeleton structure. Step 4: Try to satisfy the octets of the atoms by distributing the remaining valence electrons as nonbonding electrons. Hydrogen cyanide has linear molecular geometry with bond angles of 180 degrees. As hydrogen and nitrogen tend to be far from each other, hydrogen cyanide HCN forms a linear shape.A colorless, quickly lethal vapor or liquid with the odor of bitter almonds, hydrogen cyanide is very deadly.production are a few notable applications.The atom's negatively charged particles are called electrons.

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16.1g mass of WO3 was used.

What is mass?

The quantity of matter in an object is expressed in terms of mass. Grams (g) or kilograms are commonly used to measure mass (kg). Regardless of the object's position in the universe or the gravitational field acting on it, mass measures the amount of matter present.

Weight and mass are frequently conflated terms. Although they measure various things, they are closely related. Weight measures the force of gravity acting on an object, as opposed to mass, which measures how much matter is there in an object.

An object's gravitational pull is determined by its mass as well as the gravitational field's strength. An object's mass and weight are exactly related if the force of gravity is held constant (which it is everywhere on Earth). Therefore, an object with a higher mass will likewise weigh more.

The mass of tungsten obtained (11.4 g) is 89.4% of the theoretical yield. Therefore, to calculate the mass of WO3 used, we need to divide 11.4 g by 0.894 to find the theoretical yield and then multiply it by 1.00 to find the mass of WO3 used.

Therefore, the mass of WO3 used = (11.4 g / 0.894) x 1.00 = 16.1 g

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