Determine which statements are consistent with Daltons atomic theory

The balanced equation for the given chemical reaction can be written as 3CsCl + K[tex]_3[/tex]PO[tex]_4[/tex]→ Cs[tex]_3[/tex] (PO[tex]_4[/tex]) + 3KCl.

An equation per a chemical reaction is said to be balanced if both the reactants plus the products have the same number of atoms and total charge for each component of the reaction. In other words, each component of the reaction have an equal balance of mass and charge.

The components and outcomes of a chemical reaction are listed in an imbalanced chemical equation, but the amounts necessary to meet the conservation of mass are not specified. The balanced equation for the given chemical reaction can be written as 3CsCl + K[tex]_3[/tex]PO[tex]_4[/tex]→ Cs[tex]_3[/tex] (PO[tex]_4[/tex]) + 3KCl.

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The enthalpy change for the reaction is 443.5 kJ/mol, this indicates that the reaction is exothermic, meaning that heat is released during the reaction.

The enthalpy change of a reaction can be calculated using the following equation:

ΔH = ΣΔH(products) - ΣΔH(reactants)

where ΔH is the enthalpy change, Σ is the sum, and the subscripts refer to the enthalpy of the products and reactants.

Using the data provided, we can look up the standard enthalpy of formation (ΔHf°) for each substance involved in the reaction:

ΔHf°(CO(g)) = -110.5 kJ/mol

ΔHf°(H₂(g)) = -285.8 kJ/mol

ΔHf°(CH₃OH(l)) = -238.6 kJ/mol

To calculate the enthalpy change of the reaction, we can plug in these values into the equation:

ΔH = [ΔHf°(CH₃OH(l))] - [ΔHf°(CO(g)) + 2ΔHf°(H₂(g))]

ΔH = [-238.6 kJ/mol] - [-110.5 kJ/mol + 2(-285.8 kJ/mol)]

ΔH = [-238.6 kJ/mol] - [-682.1 kJ/mol]

ΔH = 443.5 kJ/mol

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Answer:

Gold is the most malleable and ductile metal. It is soft and usually alloyed to give it more stability as it is easily bent. It is a great conductor of heat and electricity, but its greatest strength comes from the fact that does not react with oxygen. It is found that gold is unaffected by air, water, bases and most acids.

Explanation:

Humidity levels are high, averaging around 82% due to the warm moist trade winds that flow through the archipelago, as well as sea surface temperatures, a rich and vibrant vegetative cover and abundant rainfall.

The absorbance of this solution at this wavelength would be 0.287.

We can use the relationship between percent transmittance (%T) and absorbance (A) :

% T = 10 ^ ( - A )

Rearranging this equation, we can solve for A:

A = - log (%T / 100 )

Substituting the given value, we get:

A = - log ( 51. 6 / 100) = - log (0. 516) = 0. 287

Therefore, the absorbance of this solution at 550 nm is 0.287 .

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The molarity of the ascorbic acid ([tex]C_6H_8O_6[/tex]) solution is 0.622 M.

To find the molarity of solution, we need to first calculate number of moles of ascorbic acid present in solution, using the formula:

moles = mass / molar mass

The molar mass of ascorbic acid is:

6(12.01 g/mol) + 8(1.01 g/mol) + 6(16.00 g/mol) = 176.12 g/mol

So, the number of moles of ascorbic acid present in the solution is:

moles = 5.48 g / 176.12 g/mol = 0.0311 mol

Next, we need to calculate the volume of the solution in liters, using the conversion:

[tex]1 mL = 1 * 10^{-3} L[/tex]

50.0 mL x 1 L / 1000 mL = 0.0500 L

Finally, we can calculate the molarity of the solution:

molarity = 0.0311 mol / 0.0500 L = 0.622 M

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The mass of butane, C₄H₁₀ needed to produce 70.8 g of carbon dioxide, CO₂ is 23.3 g

First, we shall write the balanced equation for the reaction. Details below:

2C₄H₁₀ + 13O₂ -> 8CO₂ + 10H₂O

From the balanced equation above,

352 g of CO₂ were obtained from 1 16 g of C₄H₁₀

Finally, we shall determine the mass of butane, C₄H₁₀ neeeded to produce 70.8 g of carbon dioxide, CO₂. Details below:

From the balanced equation above,

352 g of CO₂ were obtained from 116 g of C₄H₁₀

Therefore,

70.8 g of CO₂ will be obtain from  = (70.8 × 116) / 352 = 23.3 g of C₄H₁₀

Thus, the mass of butane needed is 23.3 g

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The cell potential (Ecell) at 25°C (298 K) for the given reaction is 1.065 V which means that the reaction is spontaneous because the calculated Ecell is positive

The cell potential (Ecell) for the given reaction can be calculated using the Nernst equation:

Ecell = E°cell - (RT ÷ nF) × ln(Q)

where E°cell = standard cell potential, R = gas constant, T = temperature in Kelvin, n = number of electrons transferred in the reaction, F = Faraday constant, and Q is the reaction quotient.

Since two electrons are transported in the half-reactions, n in this instance equals 2. With the help of the species concentrations, it is possible to determine the reaction quotient Q:

Q = [Fe2+] ÷ [Cu2+]

Q = 0.645 ÷ 0.064

Q = 10.078

Now, we can calculate the Ecell:

Ecell = E°cell - (RT ÷ nF) × ln(Q)

Ecell = (0.337 - (-0.440)) - (8.31 × 298 ÷ (2 × 96500)) × ln(10.078)

Ecell = 1.065 V

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100 mL of 3 M HCl can be neutralized with exactly 200 mL of 1.5 M NaOH. If this reaction is done in a coffee cup calorimeter, temperature would increase.

A chemical reaction known as neutralisation occurs when an acid and a base quantitatively react with one another. Alternate spellings include Neutralisation. The pH in the neutralised solution is determined by the acidity of the reactant.

Have you ever overindulged in spicy food and felt your stomach start to burn? This results from the stomach producing acid. The use of an antacid, which counteracts the effects of acid, can solve this issue; this process is known as a neutralisation response. 100 mL of 3 M HCl can be neutralized with exactly 200 mL of 1.5 M NaOH. If this reaction is done in a coffee cup calorimeter, temperature would increase.

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True. A specific type of dipole-dipole attraction results from the interaction of a hydrogen (H) atom and a weak electronegative atom

A particular kind of dipole-dipole interaction known as a hydrogen bond occurs when a hydrogen atom is covalently connected to an element that is strongly electronegative, such as nitrogen (N), oxygen (O), or fluorine (F), and another weakly electronegative atom that is present nearby. The strongly electronegative atom draws the electrons in the hydrogen-self bond, leaving the hydrogen with a partial positive charge and the electronegative atom with a partial negative charge. As a result, this interaction takes place. A hydrogen bond, a relatively potent attraction, is produced when the hydrogen atom's partial positive charge interacts electrostatically with the surrounding electronegative atom's partial negative charge. Many biological processes, such as the binding of DNA base pairs, protein folding, and cell division, depend on hydrogen bonding.

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Lavoisier has been considered by many scholars to be the father of chemistry. Chemists continued to discover new compounds in the 1800s. The science also began to develop a more theoretical foundation. It was in 1807, John Dalton put forth his atomic theory.

It was not until the era of the ancient Greeks that we have any record of how people explained the chemical changes they observed and used. At that time natural objects were thought to consist of only four basic elements like earth, air, fire and water.

It was in the fourth century BC, two Greek philosophers Democritus and Leucippus suggested that matter was not infinitely divisible into smaller particles but instead consists of the fundamental particles called the atoms. Chemistry took its present form in the 18th century.

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Answer:

1. Ionic Compound

2.Lithium Oxide

3. Li2O

Explanation:

This is an Ionic Compound because (Lithium) the metal or cation is giving away electrons to the oxygen a nonmental or anion so both can have a full valence electron shell or have all the electrons on the outer most shell.

This is also Lithium Oxide because the metal goes first then the nonmetal and the ending of the non metal is ending with an ide.

The chemical formula is the periodic table symbols (usually the metal first) and then the charges are switched. E.g  Sample A has charge of 3 and sample B has a charge of 2. The formula would be A2B3. If the charge is 1 then you can leave it blank because it is understood. E.g is sample B had a charge of 1 then it would be AB3

To calculate the molecular weight of a substance from its vapor density, we can use the following formula:

Molecular weight = (RT/P) x d

where:

R is the gas constant (0.0821 L atm/mol K)

T is the temperature in Kelvin

P is the pressure in atm

d is the vapor density (in g/L) of the substance

First, we need to calculate the vapor density of the substance using the given information. We can use the ideal gas law to find the number of moles of the substance in the flask:

PV = nRT

where:

P is the pressure (687 mmHg = 0.903 atm)

V is the volume (100 mL = 0.1 L)

n is the number of moles of gas

R is the gas constant (0.0821 L atm/mol K)

T is the temperature in Kelvin (45°C = 318 K)

Solving for n, we get:

n = PV/RT = (0.903 atm)(0.1 L)/(0.0821 L atm/mol K)(318 K) = 0.00372 mol

Next, we can use the mass and volume information to find the density of the substance:

density = mass/volume = 1.22 g/0.1 L = 12.2 g/L

Since the vapor density is half of the density of the substance in the liquid state, we can calculate the vapor density:

vapor density = density/2 = 6.1 g/L

Finally, we can use the formula above to find the molecular weight:

Molecular weight = (RT/P) x d

Molecular weight = (0.0821 L atm/mol K)(318 K)/(0.903 atm) x 6.1 g/L

Molecular weight = 92.2 g/mol

Therefore, the molecular weight of the substance is 92.2 g/mol.

Answer:

Explanation:

The total mark for this paper is 60.

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The electrode indicated is the cathode

The contents of the beaker are the electrolyte

Electrons flow from the cathode  to the anode

Dilute sulfuric acid will give colorless gases at both electrodes

The electrodes used could be made from platinum since they are inert.

Electrolysis is a process of using an electric current to drive a non-spontaneous chemical reaction.

This involves the use of an electrolytic cell, where an external power source is used to drive a chemical reaction that would otherwise not occur.

During electrolysis, positive and negative ions move toward the electrodes (positively charged anode and negatively charged cathode) where they undergo oxidation and reduction reactions respectively.

The process is commonly used in the production of metals, such as aluminum, and in the purification of copper and other metals. It is also used in various industrial and laboratory applications, including electroplating, electrorefining, and the production of hydrogen and oxygen gas.

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[tex]a. \: Ca + Cl _{2} → CaCl _{2} \\

\\ b. \: Cl _{2}+H _{2} O+ NaOH → \\ NaCl+ H _{2}O \\ \\

c. \: \: \: H _{2} SO _{4} +CaCO _{3} → \\ CaSO _{4} +H _{2}O+CO _{2} \\ \\

d. \: \: Fe+Cu(NO _{3}) _{2} → \\ Fe(NO _{3} ) _{2}+Cu[/tex]

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The container received 15.7 moles of gas.

Volume is a unit used to describe how much space an object or substance occupies. It is a physical quantity that, depending on the situation, is typically measured in measures like liters, cubic meters, or cubic feet.

The ideal gas law can be used since the gas's temperature and pressure are constant:

PV = nRT

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

The following equation can be used to link the initial and final volumes because the pressure and temperature are constant.

V1 / n1 = V2 / n2

where V1 and n1 represent the beginning volume and molecular count, and V2 and n2 represent the ultimate volume and molecular count.

To solve for n2 we can rearrange this equation as follows:

n2 = (V2 / V1) * n1

Plugging in the values we are familiar with yields:

n2 = (17.1 L / 3.10 L) * 3.51 mol.

n2 = 19.2 mol

As a result, the container was filled with the following amount of gas:

n2 - n1= 19.2 mol - 3.51 mol = 15.7 mol

As a result, the container received 15.7 moles of gas.

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The molar mass of NaCl is 58.44 g/mol, which means that one mole of NaCl contains 6.022 x 10^23 formula units (Avogadro's number).

To determine the number of formula units in a teaspoon of salt, we need to first determine how many moles of NaCl are present in 5.0 g of salt. This can be done using the following formula:

moles = mass / molar mass

moles = 5.0 g / 58.44 g/mol = 0.0854 mol

Next, we can use Avogadro's number to convert moles of NaCl to formula units:

formula units = moles x Avogadro's number

formula units = 0.0854 mol x 6.022 x 10^23 formula units/mol = 5.14 x 10^22 formula units

Therefore, there are approximately 5.14 x 10^22 formula units of NaCl in a teaspoon of salt.

The specific heat capacity of the metal can be calculated to be 2.03 J/g･ °C. This result can be explained by the fact that the heat lost by the metal is equal to the heat gained by the ethylene glycol, since no other source of heat is present.

Specific heat capacity is the amount of heat energy needed to raise the temperature of a unit mass of a substance by 1 degree Celsius. It is measured in joules per kilogram Kelvin (J/kg K).

The specific heat capacity (c) of the metal can be calculated using the following equation:

Q = mc∆T

Where Q is the heat lost by the metal, m is the mass of the metal, and ∆T is the change in temperature of the metal.

Q = (115.0 g)(c)(165.0 °C - 25.8 °C)

On the other hand, the heat gained by the ethylene glycol can be calculated using the following equation:

Q = (265.0 g)(2.43 J/g･ °C)(41.5 °C - 25.8 °C)

By equating the two equations, we can solve for the specific heat capacity of the metal:

(115.0 g)(c)(165.0 °C - 25.8 °C) = (265.0 g)(2.43 J/g･ °C)(41.5 °C - 25.8 °C)

c = 2.03 J/g･ °C

Therefore, the specific heat capacity of the metal can be calculated to be 2.03 J/g･ °C.

This result can be explained by the fact that the heat lost by the metal is equal to the heat gained by the ethylene glycol, since no other source of heat is present.

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Eruption triangulation is a method for locating an earthquake's epicenter.

The area right above the spot in the Earth's crust where an earthquake originates or begins is known as the epicenter. It marks the spot on the Earth's surface where the earthquake's seismic waves first touchdown.

The distance between the earthquake's epicenter and a number of seismograph stations is calculated using seismograms, which are records of the ground motion brought on by an earthquake.

The following are the steps to find an earthquake's epicenter:

A minimum of three separate seismograph stations should have data collected. The epicenter's distance from each station is determined by keeping track of the time the earthquake waves arrived at each station.

Map out the positions of each seismograph station.

Draw circles with an equal radius around each seismograph station using the distance information. Each circle's radius is equal to how far away the station is from the epicenter.

At the place where the circles converge, there is an epicenter.

It is crucial to keep in mind that determining the epicenter of an earthquake is not an exact science, and the precision of the position will vary depending on a number of variables, such as the caliber of the seismograms and the distance between the earthquake and the seismograph stations.

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In the year 2000, the population of Arctic foxes reached its peak.

A region's population is the total number of people living there. Typically, it is expressed as the number of persons in a given volume or region. A census is typically performed to estimate population in order to ascertain its size, density, and distribution. The term "population" can also refer to the variety of species present in a region. Population growth is the gradual rise in a species' number of individuals in a particular area.

At that time, the total number of Arctic foxes in their habitat, which stretches from northern Europe and Asia over the tundra of the Arctic Circle, was believed to be 745,000. Based on the International Union for Conservation of Nature's most recent estimations, this population figure.

The Arctic fox is a very tough species that can endure some of the world's harshest environments. They can also adjust to their surroundings and eat a range of foods, such as grass, eggs, carrion, small mammals, and carrion.

Unfortunately, a variety of causes are causing the Arctic fox population to decline at the moment. Additionally, human actions like hunting, habitat loss, and fur trapping are lowering their numbers.

The Arctic fox is not now facing extinction, according to the IUCN, which has classified it as a species of Least Concern. However, the species is threatened by a number of factors, and unless conservation efforts are made, its population is likely to keep declining.

Reducing human influences on the Arctic fox's environment is crucial for its protection. This entails restricting hunting and trapping in addition to minimising habitat loss and pollution. The ability of the species to adapt to climate change should also be improved, and their population numbers and trends should be tracked. If these steps are adopted, the number of Arctic foxes may eventually return to its original high.

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The complete question is,

Which year saw the highest arctic fox population? How many people attended?

The net cell reaction is described by the equation: Pb(s) + PbO2(s) + 4H2SO4(aq) 2PbSO4(s) + 2H2O(l). 2.14 V and -0.36 V, respectively, are the standard potentials for the oxidation and reduction half-reactions. The result is that cell = 2.50 V.

The computed value of rxn is 2.50 V, which is the difference between the two standard potentials. The computed cell potential with [H2SO4] = 10.0 M at 25 C is 2.50 V. Six lead-acid cells connected in series make up a 12 V automobile battery.

Six cells are required to obtain 12 V because each cell has a voltage of 2.0 V. Consequently, there are six lead-acid cells in a 12 V automobile battery.

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Answer: 10.51 kg of iron is produced in the reaction.

Explanation: The balanced equation for the reaction between iron III oxide and iron is:

2Fe2O3 + 3C → 4Fe + 3CO2

From the equation, we can see that 2 moles of Fe2O3 react to produce 4 moles of Fe. We can use the molar mass of Fe2O3 to convert the given mass to moles, and then use the mole ratio to calculate the moles of Fe produced. Finally, we can convert the moles of Fe to mass using the molar mass of Fe.

The molar mass of Fe2O3 is:

2(55.85 g/mol Fe) + 3(16.00 g/mol O) = 159.69 g/mol Fe2O3

So, 15 kg (or 15000 g) of Fe2O3 is equal to:

15000 g / 159.69 g/mol = 94.03 mol Fe2O3

According to the balanced equation, 2 moles of Fe2O3 produce 4 moles of Fe. So, 94.03 moles of Fe2O3 will produce:

4/2 x 94.03 = 188.06 moles of Fe

The molar mass of Fe is 55.85 g/mol, so the mass of Fe produced is:

188.06 mol x 55.85 g/mol = 10507.8 g or 10.51 kg

Sublimation and the coma is the only part of the comet that exists when it is further than 5 A.U from the sun.

Generally by the time that the comet comes within about 5 AU of the Sun, sublimation has generally formed a noticeable atmosphere that can easily escape the comet's weak gravity. The coma basically forms as the escaping atmosphere which drags away dust particles that have been mixed with the sublimating ice.

Generally when a comet is at a great distance away from the Sun, it exists as a dirty snowball several kilmometers across. But when it comes closer to the Sun, the warming of its surface causes its materials to melt and vaporize which produces the comet's characteristic tail.

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when a sufficient [tex]FeBr_{2[/tex] solution is introduced to 58.9 mL of 0.505 M [tex]Pb(NO_3)_2[/tex] solution, 5.45 grammes of [tex]PbBr_2[/tex] will precipitate.

We can figure out the amount of lead(II) bromide (PbBr2) that will precipitate by using the stoichiometry of the reaction between lead(II) nitrate [tex]Pb(NO_3)_2[/tex] and iron(II) bromide [tex](FeBr_2).[/tex]

The reaction's chemically balanced equation is as follows:

[tex]PbBr_2(s) + 2 Fe(NO_2)2 = Pb(NO_2)2(aq) + 2 FeBr_2 (aq)(aq)[/tex]

According to the equation, two moles  [tex]FeBr_2[/tex] react with one mole of [tex]Pb(NO_3)_2[/tex] to create one mole [tex]FeBr_2[/tex]. The amount  [tex]PbBr_2[/tex] that will precipitate will therefore be equal to half of the amount of [tex]Pb(NO_3)_2[/tex] that is present in the solution.

We can use the following formula to get the amount of[tex]Pb(NO_3)_2[/tex] in moles:

moles = volume x concentration

where volume is given as 58.9 mL, which we will divide by 1000 to get litres, and concentration is given as 0.505 M:

[tex]moles of Pb(NO3)2 = 0.505 M x 0.0589 L = 0.0297 moles[/tex]

Therefore, the amount of PbBr2 that will precipitate is:

[tex]PbBr2 moles =0.0297 moles / 2 moles, or 0.01485 moles.[/tex]

Finally, using the molar mass of [tex]PbBr_2[/tex], which is 367.01 g/mol, we can convert the number of moles  [tex]PbBr_2[/tex] to grammes:

[tex]mass of PbBr2 = 0.01485 moles x 367.01 g/mol = 5.45 g[/tex]

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Answer:

reducing it with a reducing agent

The standard reduction potential of Y₃⁺ is +1.97 V.

The cell potential of a galvanic cell is given by the difference between the standard reduction potentials of the two half-cells. In this case, the cell consists of two half-cells:

Y₂O₃(s) + 6H⁺(aq) + 3e⁻ → 2Y³⁺(aq) + 3H₂O(l) E° = +1.97 V

AgBr(s) + e⁻ → Ag(s) + Br⁻(aq) E° = +0.65 V

The cell potential is given as 1.32 V. We know the reduction potential of one half-cell (AgBr/Ag), so we can use it to determine the reduction potential of the other half-cell (Y₂O₃/Y³⁺):

E°cell = E°reduction (Y³⁺) - E°reduction (AgBr)

1.32 V = E°reduction (Y³⁺) - 0.65 V

E°reduction (Y³⁺) = 1.32 V + 0.65 V

E°reduction (Y³⁺) = 1.97 V

Therefore, Y₃⁺ has a typical reduction potential of +1.97 V, which is the reduction potential of Y₃⁺ under standard conditions (1 M concentration, 1 atm pressure, 25°C temperature).

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Answer:

If a solution appears red, it is most likely that green light is being absorbed the strongest. When light passes through a solution, the solution absorbs certain colors of light while allowing others to pass through. The color that we see is the color that is not absorbed and is transmitted through the solution. In the case of a red solution, red light is transmitted while green light is absorbed. This selective absorption of light is due to the specific chemical composition of the solution.

Due to changes in stream temperature, stream flow due to shortages or increased storms, and other stressors which can affect ecosystem health, these aquatic ecosystems are at risk from climate change.

The long-term trend of the weather in a place is called the climate. Hour by hour, day by day, month by month, or even year by year, the weather might change. Due to changes in stream temperature (which results in a corresponding drop in oxygen levels).

Stream flow due to shortages or increased storms, and other stressors (such as increased storm runoff such as nutrients, pollutants, along with sediment) which can affect ecosystem health, these aquatic ecosystems are at risk from climate change.

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The mass, in grams, of SO₃ in 1.00 L of the air sample is 27.48 g.

To determine the mass of SO₃ in 1.00 L of an air sample, we need to use the ideal gas law:

PV = nRT

where P is the partial pressure of SO₃, V is the volume of the sample (1.00 L), n is the number of moles of SO₃, R is the gas constant, and T is the temperature in Kelvin (308 K)

n = PV/RT

n = (8.75 torr) × (1.00 L) ÷ (0.0821 L·atm/mol·K) × (308 K)

n = 0.343 mol

To convert this to mass, we need to use the molar mass of SO₃, which is 80.06 g/mol. Therefore, the mass of SO₃ in 1.00 L of the air sample is:

mass = n × molar mass

mass = 0.343 mol × 80.06 g/mol

mass = 27.48 g

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