The density of a mixture of O2 and N2 at NTP is 1.3 g litre−1. Calculate partial pressure of O2.
0.28 atm
0.30 atm
0.56 atm
0.12 atm

Based on the calculations, the total pressure of the final products is equal to 1.76 atm.

From the information provided about this chemical reaction, we can logically deduce the following parameters:

Next, we would write the properly balanced chemical equation for this chemical reaction:

                               I₂ + 5F₂   ⇒  2IF₅

Also, we would determine the number of moles of each atom of I₂ and F₂:

\(Number \;of \;moles = \frac{mass}{molar\;mass}\)

Substituting the given parameters into the formula, we have;

Number of moles = 63.45/253.8

Number of moles = 0.25 moles.

Assuming I₂ were limiting, we would need:

5 × 0.25 = 1.25 moles of F₂.

For fluorine gas, we have:

PV = mRT/MM

Mass, m = PVMM/RT

Mass, m = 2.5(5.00)(38)/(0.0821 × 298)

Mass, m = 475/24.4658

Mass, m = 19.42 grams.

Number of moles = 19.42/38

Number of moles = 0.51 moles.

The total number of moles = 0.25 + 0.51 = 0.76 mol.

For the mole fraction of I₂, we have:

Mf = 0.25/0.76

Mole fraction = 0.33.

For the mole fraction of F₂, we have:

Mole fraction = 1 - 0.33 = 0.67.

Next, we would determine the total pressure of the two elements by applying Dalton's law:

Total pressure = 0.33 × 0.27 + 0.67 × 2.5

Total pressure = 1.76 atm.

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The name of the organic compound is 2-methyl pentane. The given organic compound is a five-carbon system with a substitution at the C-2 carbon. The naming of an organic compound is done according to the rules given by IUPAC.

The given organic compound has 5 carbon in its main chain. So It has the root word Pent. Since, all the bonds are single bonds, the organic compound is saturated, hence it has the suffix -ane. Hence the unsubstituted straight chain is pentane.

Numbering is done from right to left, because when the numbering is from right to left, the substituted carbon gets C-2, when it is numbered from left to right, the substituted carbon gets C-4. So the numbering is from the right and the substituted carbon is C-2. The substituent is a single carbon system, a methyl substituent. So the organic compound is named 2-methyl pentane .

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The rate of formation of oxygen gas in an experiment where 0.08 mol of N2O5 is consumed in a 4.0L reaction vessel is 0.02 mol/L/s.

To calculate the rate of formation of oxygen gas, use the balanced equation:

N2O5(g) → 2NO2(g) + 1/2O2(g)

The stoichiometry of the reaction implies that 1 mole of N2O5 produces 1/2 mole of O2 gas. So, if 0.08 mole of N2O5 is used up, 1/2 x 0.08 mole = 0.04 mole of O2 gas will be formed.

The volume of the reaction vessel is given as 4.0L. Therefore, the concentration of O2 gas is 0.04 mole/4.0 L = 0.01 mol/L

The experiment's rate is given as the rate of formation of O2 gas, which is the rate of its appearance. Since the stoichiometry of the reaction shows that 1 mole of N2O5 produces 1/2 mole of O2 gas, then the rate of formation of O2 gas equals half the rate of consumption of N2O5 gas.

Therefore, Rate of formation of O2 gas = 1/2 x Rate of consumption of N2O5 gas

We can calculate the rate of consumption of N2O5 gas as follows:

Let's say that the initial concentration of N2O5 gas is [N2O5]0, and that after some time t, the concentration is [N2O5]t.

Then, the rate of consumption of N2O5 gas, RC, is given by:

RC = -Δ[N2O5]/Δt = ([N2O5]0 - [N2O5]t)/t

where the negative sign indicates that the concentration of N2O5 is decreasing. We can rearrange this equation to solve for Δ[N2O5]/Δt, which is the average rate of consumption of N2O5 gas during the time interval Δt:Δ[N2O5]/Δt = ([N2O5]t - [N2O5]0)/t

The experiment's rate of consumption of N2O5 gas is not given in the question. However, we can calculate it if we know the initial concentration of N2O5 gas, [N2O5]0, and the concentration after some time t, [N2O5]t.

For example, if [N2O5]0 = 0.1 mol/L and [N2O5]t = 0.05 mol/L after 5 seconds, then:

RC = ([N2O5]0 - [N2O5]t)/t = (0.1 - 0.05)/5 = 0.01 mol/L/s

Therefore, the rate of formation of O2 gas, which is half the rate of consumption of N2O5 gas, is:

Rate of formation of O2 gas = 1/2 x 0.01 mol/L/s = 0.005 mol/L/s = 0.02 mol/L/s (using the previously calculated value of the rate of consumption of N2O5 gas).

Hence, the rate of formation of oxygen gas in an experiment where 0.08 mol of N2O5 is consumed in a 4.0L reaction vessel is 0.02 mol/L/s.

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Answer:

Copper ii nitrate is the limiting reagent

Explanation:

The first thing to write here is the equation of reaction;

Fe + Cu(NO3)2 ——> Fe(NO3)2 + Cu

When we talk of limiting reagent, we mean the reactant that is totally consumed upon the completion of the chemical reaction

To get the limiting reagent, we can know this by calculating the mass of a specific product formed from each of the masses of the reactants

Now, we can use the amount of copper solid deposited by each of the reactants to know the limiting reagent here.

Since the mole ratio in all cases is 1 to 1, this will be easy

For the iron, the number of moles reacted is mass of iron/ atomic mass of iron

That would be 119.5/56 = 2.134 moles

Now since the mole ratio is 1 to 1, 2.134 moles of copper will be formed

Thus, the mass of copper produced from the iron will be number of moles * atomic mass of copper = 2.134 * 64 = 136.57g

Now from the nitrate, the number of moles is

mass mixed/ molar mass of copper nitrate

molar mass of copper nitrate is 188g/mol

number of moles is thus 279.5/188 = 1.487 moles

Since the mole ratio is 1 to 1, it means that the number of moles of copper produced too is 1.487 moles

The mass of copper produced from this is number of moles of copper * atomic mass of copper

That will be 1.487 * 64 = 95.15g

Now, since the copper nitrate produces less amount of copper solid, it is the the reagent to be consumed first and thus it is our limiting reagent

The heat capacity, also known as specific heat, is the quantity of heat needed to raise the temperature by one degree Celsius per unit of mass.

Specific heat can be used to distinguish between two polymeric composites and help determine the processing temperatures and amount of heat required for processing.

Temperature is an immediate estimation of nuclear power, implying that the more sizzling an article is, the more nuclear power it has. The amount of thermal energy transferred between two systems is measured by heat.

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Ethanol weight, 588.15 grammes. Chemical reaction: m(C6H12O6) = 1150 g; C6H12O6 2C2H5OH + 2CO2.

Calculating the yeast's rate of fermentation involves taking the volume of CO2 at the tube's top and dividing it by the time it took for it to form.

Fermentation comes in two flavours: lactic acid fermentation and alcohol fermentation. Only lactic acid fermentation is possible in our cells, but we utilise both forms of fermentation by using other organisms.

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Answer:

electrons

Explanation:

since they are at the outer part of nucleus

Answer:

Weakly

Explanation:

Being farther from the nucleus and with more electrons shielding the protons results in the valence electrons being held weakly.

The final concentrations are:

pH = pKa + log([\(HCO_3\)-]/[\(CO_2\)])

The pKa of the bicarbonate buffering system is 6.35. Plugging in the values we have, we get:

7.65 = 6.35 +  log([\(HCO_3\)-]/[\(CO_2\)])

log([\(HCO_3\)-]/[\(CO_2\)]) = 1.3

([\(HCO_3\)-]/[\(CO_2\)]) = 20

We know that [\(HCO_3\)-] = 2.00 x \(10^-3\) mol/L, so we can solve for [\(CO_2\)]:

[\(CO_2\)] = [\(HCO_3\)-]/20 = 1.00 x \(10^-4\) mol/L

Using the equilibrium constants, we can calculate the concentrations of the other species:

[\(H_3O\)+] = K1[\(H_2CO_3\)]/[\(CO_2\)] = (4.45 x \(10^-7\))([\(HCO_3\)-]²/[\(CO_2\)]) = 3.55 x\(10^-8\)mol/L

[OH-] = Kw/[\(H_3O\)+] = 1.00 x \(10^-14\)/3.55 x \(10^-8\) = 2.82 x \(10^-7\) mol/L

[\(CO_2\)-] = K2[\(HCO_3\)-]/[H+]= (4.69 x \(10^-11\))([\(CO_2\)]/[\(HCO_3\)-]) = 1.18 x \(10^-10\)mol/L

The final concentrations are:

[\(CO_2\)] = 1.00 x \(10^-4\) mol/L

[\(HCO_3\)-] = 2.00 x \(10^-3\)mol/L

[\(CO_32\)-] = 1.18 x \(10^-10\) mol/L

[\(H_3O\)+] = 3.55 x \(10^-8\) mol/L

[\(OH\)-] = 2.82 x \(10^-7\) mol/L

Concentration refers to the amount of a substance dissolved in a given volume or mass of another substance. It is a measure of the amount of solute present in a solution or mixture. Concentration is usually expressed in terms of mass per unit volume, moles per unit volume, or percentage by mass or volume.

The most commonly used units of concentration include molarity, molality, normality, mass percent, and volume percent. Molarity refers to the number of moles of solute per liter of solution, while molality is the number of moles of solute per kilogram of solvent. Normality is similar to molarity, but it takes into account the number of acidic or basic equivalents in a solution. Mass percent and volume percent are used to express the concentration of a solute in a solution as a percentage of the total mass or volume of the solution.

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Answer:

what we have to do ? pls paste the whole question .

Explanation:

Considering the definition of isotopes and atomic mass of an element, the atomic mass of iron is 55.9012 amu.

An isotope is a form of a chemical element in which the atoms have the same number of protons, but a different number of neutrons.

The atomic mass of an element is the weighted average mass of its natural isotopes, considering the relative abundance of each of them.

In this case, you know iron has four isotopes:

Then, the atomic mass of iron can be calculated as:

atomic mass of iron= 53.9396 amu×0.0582 + 55.9349 amu×0.9166 + 56.9354 amu×0.0219 + 57.9333 amu×0.0033

atomic mass of iron= 55.9012 amu

Finally, the atomic mass in this case is 55.9012 amu.

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One mole of the any gas can occupy a certain amount of space, which is known as its molar volume. At room temperature as well as pressure (rtp), 1 mole of gas will always take up 24 dm3 and 24,000 cm3.

The following formula can be used to model the burning of ethane: 2 C2H6 Plus 7O2 Equals 4 CO2 = 6H2O. This equation shows that two moles from C2H6 result in the production of four moles of CO2. As a result, 4/2 = 2 mole of CO2 would result from 1 mole of C2H6.

We must divide the fuel's mass, which is 4.6 grammes, by the problem's given fuel's molar mass, which is 46 grammes per mole, in order to determine the total moles of fuel. The result was 0.1 moles since the units of grammes cancel after division.

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The redox reaction must occur between an oxidizing agent and a reducing agent.

From your question, you want  me to give you a general idea about redox reaction and that is what I will do. Firstly, a redox reaction is one in which one specie is oxidized and the other is reduced. The both processes have to occur simultaneously.

When we say that the both processes occur simultaneously, we mean that the electron that is lost in one process is gained in another process and all these must happen within the same system not apart from each other.

The oxidation number of one specie increases while the oxidation number of the other specie decreases. Hence, an redox reaction must occur between an oxidizing agent and a reducing agent.

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The potential temperature is 15°C.

Given,The temperature of some air is minus 20 degrees C at 95 kPa of pressure.

Reference pressure at sea level = 101.3 kPa

The potential temperature (θ) is the temperature a parcel of dry air would have if it were adiabatically brought to a standard reference pressure, typically 1000 millibars (100 kPa).

Potential temperature is directly proportional to the absolute temperature and inversely proportional to the pressure in a system.

In order to find the potential temperature of the given air, we can use the formula below:

θ = T × (P0 / P)^(R/cp)

where,θ = potential temperature (in Kelvin)

T = temperature (in Kelvin)

P0 = reference pressure (in Pa)

P = actual pressure (in Pa)

R = gas constant for dry air (287 J/(kg·K))

cp = specific heat of dry air at constant pressure (1004 J/(kg·K))

Converting the given temperature in Celsius to Kelvin:

T = -20°C + 273.15K= 253.15K

The formula can be written as:

θ = T × (P0 / P)^(R/cp)θ

= 253.15 × (101300/95000)^(287/1004)θ

= 288.5 K

Converting the potential temperature from Kelvin to Celsius:

θ = 288.5 K - 273.15

= 15.35°C (to the nearest degree)'

= 15°C (rounded off to the nearest degree).

Therefore, the potential temperature is 15°C.

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When a molecule loses or gains an electron it becomes an ion.

"If it gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion."

Answer:

the molecule become an iron

Explanation:

have a great day

Capillary action involves the hydrogen bonding in water.

We have to note that when we are talking about capillary action, what we mean is the movement of water up the paper. We know that this movement of water would have a lot to do with the kind of intermolecular interaction that is going on.

Note that the water is composed of polar O-H bonds that can be able to interact with the -OH bonds that can be seen in the cellulose that is water and this accounts for the capillary action in water.

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Answer: The answers are A. Reactant elements and/or compounds rearrange to form chemically new products, B. Energy is absorbed when bonds are broken, and D. Energy is released when bonds are formed.

Explanation:

The statement that is true for all chemical reactions is "Reactant elements and/or compounds rearrange to  form chemically new products."

A chemical reaction refers to any combination of reactants to yield products.

A chemical reaction involves rearrangement of bonds in reactant molecules in order to yield product molecules.

The rearrangement of chemical bonds in reactants to yield products is characteristic of all chemical reactions.

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Answer:

The more hydrogen bonds a molecule can make, the higher the surface tension.

Explanation:

The more hydrogen bonds a molecule can make, the higher the surface tension. Therefore, this statement best describes the relationship between bonding and surface tension.

Surface tension exists property of a liquid surface indicated by its acting as if it existed as a stretched elastic membrane. This phenomenon can be regarded in the nearly spherical shape of small drops of liquids and soap bubbles. Because of this property, specific insects can stand on the surface of the water. A razor blade also can be sustained by the surface tension of water. The razor blade exists not floating: if pushed via the surface, it descends via the water.

Hence, The more hydrogen bonds a molecule can make, the higher the surface tension. Thus, this statement best represents the connection between bonding and surface tension.

Therefore, (C) option is the correct answer.

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Only possible with alkaline earth metals

Let's see an example

\(\\ \sf\longmapsto X(OH)_2\)

The elements are

Option C is correct

\(\rule{300pt}{1000000pt}\)

Answer:

Lithium Carbonite

Explanation:

Answer:

Lithium

Explanation:

Answer:

190

Explanation:

Gold has atomic number of 79, which is the number of protons.

Mass number = #protons + #neutrons = 79 + 111 = 190

After 72 days, a 1050 mg sample of Iodine-131 would have decayed to approximately 46.87 mg.

A half-life is the time it takes for half of a sample of a radioactive isotope to decay. It is a characteristic property of each isotope and can be used to predict how long it will take for a given sample to decay to a certain amount. The amount of an isotope remaining after a certain amount of time can be calculated using the half-life and the formula N = N0 * (1/2)^(t/T).

Iodine-131 is used in medical treatments because it emits beta particles that can destroy cancerous cells. Its short half-life is an advantage because it allows for a higher dose of radiation to be delivered to the tumor while minimizing the amount of radiation exposure to healthy tissues. After a few weeks, the Iodine-131 decays to a negligible amount and the patient is no longer radioactive.

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Answer:

It is convenient to consider the structures of the body in terms of fundamental levels of organization that increase in complexity: subatomic particles, atoms, molecules, organelles, cells, tissues, organs, organ systems, organisms and biosphere

Explanation:

i hope it help you

Blocking calcium influx into the axon terminal can have several effects on neuronal communication and neurotransmitter release.

Calcium influx into the axon terminal is a key step in the process of neurotransmitter release. When an action potential reaches the axon terminal, it triggers the opening of voltage-gated calcium channels, allowing calcium ions to flow into the terminal. The increase in intracellular calcium concentration triggers the fusion of synaptic vesicles containing neurotransmitters with the presynaptic membrane, and the subsequent release of the neurotransmitters into the synaptic cleft.

If calcium influx into the axon terminal is blocked, neurotransmitter release is inhibited or reduced. This can lead to a variety of effects, depending on the specific neurotransmitter and the location of the synapse. For example:

- Inhibition of excitatory neurotransmitter release could reduce synaptic transmission and decrease neuronal activity.
- Inhibition of inhibitory neurotransmitter release could increase synaptic transmission and increase neuronal activity.
- Inhibition of neurotransmitter release at neuromuscular junctions could lead to muscle weakness or paralysis.

Calcium channel blockers are a class of drugs that can be used to block calcium influx into axon terminals and reduce neurotransmitter release. These drugs are used to treat a variety of conditions, including high blood pressure, angina, and arrhythmias.

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The number of oxygen atoms in each formula unit of lead nitrite is equal to four.

A formula unit can be used to represent the lowest whole number ratio of ions in an ionic compound. The formula mass of an ionic compound is equal to the sum of the atomic masses of the ions in the formula unit.

A formula unit can be described as an empirical formula of any covalent or ionic compound that can be used as an independent entity for stoichiometric calculations.

Given the chemical formula of the Lead(II) nitrite is Pb(NO₂)₂. The number of oxygen atoms in each formula unit is four.

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Answer:

The Pauli Exclusion Principle states that, in an atom or molecule, no two electrons can have the same four electronic quantum numbers. As an orbital can contain a maximum of only two electrons, the two electrons must have opposing spins.

Explanation:

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The key differences between pneumatic and hydraulic systems are:

The fluid used: Pneumatic systems use air as the fluid, while hydraulic systems use a liquid such as oil.

The transmission of power: In pneumatic systems, power is transmitted through the movement of air, while in hydraulic systems, power is transmitted through the movement of a pressurized liquid.

The types of forces involved: Pneumatic systems typically involve forces that are relatively low in magnitude but high in speed, while hydraulic systems involve forces that are high in magnitude but low in speed.

Pascal's Law states that the pressure applied to a confined fluid is transmitted undiminished in all directions and acts with equal force on equal areas. An example of a household item that applies Pascal's Law is a hydraulic jack, which uses a confined fluid (usually oil) to transmit pressure and lift heavy objects. When the handle of the jack is pressed down, the pressure of the fluid is increased and transmitted through the system, causing the lift arm to rise.

Advantages of pneumatic systems:

They are relatively simple and easy to maintain.

They are energy efficient, as air is a readily available and inexpensive fluid.

They are safe to use, as there is no risk of explosions or fires.

Disadvantages of pneumatic systems:

They are limited in their power transmission capabilities, as the forces generated by pneumatic systems are typically lower than those generated by hydraulic systems.

They are not suitable for use in high-pressure or high-temperature applications.

They are prone to leakage, as air can escape through small openings.

Examples of pneumatic systems:

Air compressors

Pneumatic tools such as hammers and drills

Automatic doors in buildings

Advantages of hydraulic systems:

They can transmit large amounts of power with relatively small amounts of force.

They are able to generate high pressures, making them suitable for use in a wide range of applications.

They are relatively simple and easy to maintain.

Disadvantages of hydraulic systems:

They require a separate power source to operate, such as an electric motor or gasoline engine.

They can be expensive to repair if they fail or leak.

They can be hazardous to use, as the fluid used (usually oil) is flammable and can cause burns or fires.

Examples of hydraulic systems:

Hydraulic lifts in automotive garages

Hydraulic jacks and presses

Hydraulic brakes in vehicles

Excavators and bulldozers

P-aminophenol has a molar mass of 109.13 g/mol. Acetaminophen has a molar mass of 151.17 g/mol. Acetic anhydride has a capacity of 1.1 mL.

The mass of acetaminophen, stated as 0.157g, must be multiplied by the molar mass of acetaminophen to get the theoretical yield. It weighs 151.2g in this case. The theoretical yield thus becomes 0.217g.

A measurement called production yield is obtained by dividing the number of high-quality parts produced by the total number of parts started in production.

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The equilibrium constant of the reaction from the calculation that has been done is 0.154

The concentrations (or partial pressures) of reactants and products in chemical equilibrium for a specific chemical reaction are related by the equilibrium constant (K), a mathematical equation. It quantifies the degree to which an equilibrium has been reached in a reaction.

We have the equation of the reaction as;

A(g) + B(g) ⇔C(g)

Thus;

Keq = 45.83/11.23 * 26.50

Keq = 0.154

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Answer:

Molarity = 0.08 M

Explanation:

Given data:

Mass of copper sulfate = 3.8 g

Volume of water = 250 cm³  (250/1000 = 0.25 L)

Concentration of solution = ?

Solution:

Number of moles of copper sulfate:

Number of moles = mass/molar mass

Number of moles = 3.8 g/ 159.6 g/mol

Number of moles = 0.02 mol

Concentration:

Molarity = Number of moles / volume in L

By putting values,

Molarity = 0.02 mol / 0.25 L

Molarity = 0.08 mol/L

Molarity = 0.08 M

The amount of excess acetic anhydride is:Amount of excess acetic anhydride = initial amount - amount used = 0.0196 mol - 0.0145 mol = 0.0051 molTherefore, 0.0051 mol of acetic anhydride is used in the reaction.

The balanced chemical equation for the reaction of salicylic acid with acetic anhydride is given as follows: 2C7H6O3 + C4H6O3 ⟶ 2C9H8O4 + H2OIn this equation, salicylic acid (C7H6O3) is the limiting reagent and acetic anhydride (C4H6O3) is the excess reagent. The stoichiometric ratio between salicylic acid and acetic anhydride is 2:1. This means that for every two moles of salicylic acid, one mole of acetic anhydride is required. To find out how much of the excess reactant is used when the reaction is complete, we need to determine the limiting reagent and the excess reagent. We can do this by calculating the amount of product that each reactant can produce and comparing the values.Let's first calculate the number of moles of each reactant:No. of moles of salicylic acid = mass/molar mass = 2/138 = 0.0145 molNo. of moles of acetic anhydride = mass/molar mass = 2/102 = 0.0196 molTo determine the limiting reagent, we need to calculate the amount of product that each reactant can produce.

According to the balanced equation, 2 moles of salicylic acid produces 2 moles of aspirin, while 1 mole of acetic anhydride produces 2 moles of aspirin. Therefore, the amount of aspirin that can be produced from each reactant is as follows : Amount of aspirin produced from salicylic acid = 2 x 0.0145 mol = 0.0290 molAmount of aspirin produced from acetic anhydride = 2 x 0.0196 mol = 0.0392 molSince salicylic acid can produce only 0.0290 mol of aspirin, it is the limiting reagent. This means that acetic anhydride is in excess. To determine how much of the excess reactant is used, we need to subtract the amount of acetic anhydride used from the amount that was initially present. The amount of acetic anhydride used is equal to the amount of salicylic acid used, which is 0.0145 mol.

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