What volume does 0.20 g methane gas (CH4) occupy at 312 K and 2.00 atm?
• Your answer should include two significant figures (round your answer to two decimal places).

The molality of a solution is determined by the amount of solute (in moles) and the mass of the solvent (in kilograms). To convert the mass of NaCl to moles, the molar mass of NaCl is 58.44 g/mol. The number of moles of NaCl is 25 g / 58.44 g/mol = 0.427 mol. The molality of the solution is 0.213 mol/kg.

The amount of a solute dissolved in a solvent is indicated by the chemical term "molality," which is commonly defined in terms of moles of solute per kilogramme of solvent. Because it takes into account variations in the volume of the solution owing to temperature and pressure, it differs from molarity, which quantifies the quantity of a solute in moles per litre of solution.

To calculate the molality of a solution, we need to know the amount of solute (in moles) and the mass of the solvent (in kilograms).

In this case, we are given:

Mass of solute (NaCl) = 25 g

Mass of solvent (water) = 2.0 kg

To calculate the amount of solute in moles, we need to convert the mass of NaCl to moles using its molar mass:

Molar mass of NaCl = 58.44 g/mol

Number of moles of NaCl = (25 g) / (58.44 g/mol) = 0.427 mol

Now we can calculate the molality of the solution:

Molality = (number of moles of solute) / (mass of solvent in kg)

Molality = (0.427 mol) / (2.0 kg) = 0.213 mol/kg

Therefore, the molality of the solution is 0.213 mol/kg.

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The heat released is 1600 joules, so the correct option is the first one.

To calculate the heat released when 60.0 g of ethanol cools from 70 °C to 43 °C, we can use the formula for heat transfer:

q = m * C * ΔT

where:

Given:

Mass of ethanol (m) = 60.0 g

Specific heat capacity of ethanol (C) = 1.0 J/(g°C) (at constant pressure)

Change in temperature (ΔT) = Final temperature - Initial temperature = 43 °C - 70 °C = -27 °C

Note that the negative sign in ΔT indicates that heat is being released (i.e., the substance is cooling).

Plugging in the given values into the formula:

q = 60.0 g *1.0 J/(g°C) * (-27 °C)

q ≈ -1600 J

The negative sign is for notation, here we can see that the amount of heat is 1600 joules, so the correct option is the first one.

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The above is about the movement of lithospheric plates. See explanation and attached image for details.

The movement of lithospheric plates is driven by convection currents in the Earth's mantle, which are caused by heat generated from the Earth's core. These currents cause the lithospheric plates to move, and the motion can result in a variety of geological phenomena, including earthquakes, volcanic activity, and the formation of mountain ranges and oceanic trenches.

There are three main types of plate boundaries, and each one results in a different type of movement of lithospheric plates:

Divergent Boundaries: At divergent boundaries, lithospheric plates move away from each other. This movement is caused by the upwelling of hot material from the mantle, which pushes the plates apart. As the plates move away from each other, magma rises up to fill the gap between them, creating new crust. Divergent boundaries are where new oceanic crust is formed.

Convergent Boundaries: At convergent boundaries, lithospheric plates move towards each other. There are three types of convergent boundaries: oceanic-oceanic, oceanic-continental, and continental-continental. At oceanic-oceanic and oceanic-continental convergent boundaries, one plate is forced beneath the other, creating a subduction zone. This movement is caused by the sinking of a denser plate beneath a less dense plate. As the denser plate sinks, it melts and can trigger volcanic activity. At continental-continental convergent boundaries, the plates are too buoyant to subduct, so they instead buckle and push up, forming mountain ranges.

Transform Boundaries: At transform boundaries, lithospheric plates move past each other. This movement is caused by the lateral movement of the convection currents in the mantle. Transform boundaries can create large faults, which can lead to earthquakes.

Overall, the movement of lithospheric plates is a complex and dynamic process, driven by the movement of material within the Earth's mantle.

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When sodium carbonate is titrated against HCl in the presence of the indicator phenolphthalein, it is transformed to NaCl.

To decolorize phenolphthalein, 50 mL of a combination of NaOH and Na2CO3titrated with N10 HCl using phenolphthalein indicator required 50 mL of HCl. At this point, methyl orange was added, and the acid addition was continued. The second endpoint was obtained when another 10 ml of N10 HCl was added.

You can use more than one indicator since the interaction between sodium carbonate and hydrochloric acid occurs in two phases. The first stage is better served by phenolphthalein, whereas the second is best served by methyl orange.

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The decay constant for this process is

The decay constant (λ) is related to the half-life (t1/2) by the following equation:

λ = ln(2) / t1/2

where

ln(2) is the natural logarithm of 2, which is approximately 0.693.

Substituting the given half-life of 3.1 min into the equation, we get:

λ = ln(2) / (3.1 min) ≈ 0.223 min^(-1)

Therefore, the decay constant for the β decay of Tl-208 is approximately 0.223 min^(-1).

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The claim that paraffin wax would float in ethanol (d = 789 kg/L) is accurate.

A 40–50% aqueous solution would have a density that could be adjusted to be just below that of paraffin wax, while regular alcohol (ethanol) has a density of roughly 0.8. The wax would then begin to sink. Warming causes the wax's density to significantly decrease (more than ethanol does), causing it to float.

Even with your lungs completely expanded, you cannot float in 80-proof (or 40%) alcohol since your body weighs more than the booze and will sink if you stop swimming.

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3.0 moles of [tex]Al[/tex] can fully react with hydrogen chloride to produce 4.5 moles of [tex]H_{2}[/tex]. Thus, 0.93 moles will be produced by 0.62 moles of [tex]Al[/tex].

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40 grams of KCl are dissolved in 100 mL of water at 45C. 5g of  additional grams of KCI are needed to make the solution saturated at 80 C as the solubility of KCl is 45g/ml

A uniform combination of a number of solutes within a solvent is referred to as a solution. One frequent illustration of a Solution is adding sugar cubes into your cup of tea and coffee. Solubility is the quality that makes sugar molecules more soluble.

In water, potassium chloride (KCl) dissolves. Its water solubility, like that of all other solutes, depends on temperature. The solubility of a salt increases as the solvent's temperature rises. This is fairly simple to experience with sugar. 40 grams of KCl are dissolved in 100 mL of water at 45C. 5g of  additional grams of KCI are needed to make the solution saturated at 80 C as the solubility of KCl is 45g/ml.

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Answer silver chloride (AgCl) and lead chloride (PbCl2).

Explanation:

Two salts that have the same solubility at approximately 23°C are silver chloride (AgCl) and lead chloride (PbCl2).

Both AgCl and PbCl2 have very low solubilities in water at room temperature, and their solubilities are similar at around 23°C. They are both sparingly soluble salts, meaning they dissolve only to a limited extent in water to form a saturated solution.

It's important to note that solubility can vary depending on the specific conditions, such as temperature, pressure, and presence of other substances. The solubility of salts can also be affected by factors such as pH and the presence of other ions in solution. Therefore, it's always best to consult reliable sources, such as reference tables or experimental data, for accurate solubility information at a given temperature.

To solve this problem, we can use the following equation that relates the pH of a solution to the acid dissociation constant (Ka) and the concentration of the acid:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution.

(a) To find the Ka of the unknown acid, we need to first find the concentration of hydrogen ions in the solution. We can do this by taking the inverse of the pH and converting it to a concentration:

[H+] = 10^(-pH) = 10^(-3.56) = 2.17 × 10^(-4) M

The acid dissociation constant (Ka) can then be calculated using the equation:

Ka = [H+][A-]/[HA]

where [A-] is the concentration of the conjugate base of the acid and [HA] is the concentration of the undissociated acid. Since we don't know the values of these concentrations, we need to use the fact that the solution is 0.500 M to make an assumption about the degree of dissociation (α) of the acid:

α = [A-]/[HA]

Since the solution is not extremely dilute, we can assume that the degree of dissociation is small and that the concentration of the undissociated acid is approximately equal to the initial concentration of the acid. Therefore, we can write:

[A-] ≈ 0.500α

[HA] ≈ 0.500 - 0.500α

Substituting these expressions into the equation for Ka, we get:

Ka = [H+][A-]/[HA] ≈ ([H+][A-])/0.500α

≈ ([H+]/Ka)(0.500α)/(1-α)

Solving for Ka, we get:

Ka ≈ H+/0.500α

Substituting the values we have calculated, we get:

Ka ≈ (2.17 × 10^(-4))(1-α)/(0.500α) = 4.37 × 10^(-5)

Therefore, the acid dissociation constant of the unknown acid is approximately 4.37 × 10^(-5).

(b) To find the percentage of acid that is ionized in the solution, we can use the equation:

α = [A-]/[HA] = 10^(-pKa + pH)/(1 + 10^(-pKa + pH))

where pKa is the negative logarithm of the acid dissociation constant. Substituting the values we have calculated, we get:

α = 10^(-(-4.36) + 3.56)/(1 + 10^(-(-4.36) + 3.56)) ≈ 0.008

Therefore, the percentage of acid that is ionized in the solution is approximately 0.8%.

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To solve this problem, we can use the following equation that relates the pH of a solution to the acid dissociation constant (Ka) and the concentration of the acid:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in the solution.

(a) To find the Ka of the unknown acid, we need to first find the concentration of hydrogen ions in the solution. We can do this by taking the inverse of the pH and converting it to a concentration:

[H+] = 10^(-pH) = 10^(-3.56) = 2.17 × 10^(-4) M

The acid dissociation constant (Ka) can then be calculated using the equation:

Ka = [H+][A-]/[HA]

where [A-] is the concentration of the conjugate base of the acid and [HA] is the concentration of the undissociated acid. Since we don't know the values of these concentrations, we need to use the fact that the solution is 0.500 M to make an assumption about the degree of dissociation (α) of the acid:

α = [A-]/[HA]

Since the solution is not extremely dilute, we can assume that the degree of dissociation is small and that the concentration of the undissociated acid is approximately equal to the initial concentration of the acid. Therefore, we can write:

[A-] ≈ 0.500α

[HA] ≈ 0.500 - 0.500α

Substituting these expressions into the equation for Ka, we get:

Ka = [H+][A-]/[HA] ≈ ([H+][A-])/0.500α

≈ ([H+]/Ka)(0.500α)/(1-α)

Solving for Ka, we get:

Ka ≈ H+/0.500α

Substituting the values we have calculated, we get:

Ka ≈ (2.17 × 10^(-4))(1-α)/(0.500α) = 4.37 × 10^(-5)

Therefore, the acid dissociation constant of the unknown acid is approximately 4.37 × 10^(-5).

(b) To find the percentage of acid that is ionized in the solution, we can use the equation:

α = [A-]/[HA] = 10^(-pKa + pH)/(1 + 10^(-pKa + pH))

where pKa is the negative logarithm of the acid dissociation constant. Substituting the values we have calculated, we get:

α = 10^(-(-4.36) + 3.56)/(1 + 10^(-(-4.36) + 3.56)) ≈ 0.008

Therefore, the percentage of acid that is ionized in the solution is approximately 0.8%.

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The direction of the reaction, as written, spontaneous at 25 ∘C and standard pressure is reverse.

To calculate the value of Δ∘rxn at 25.0 ∘C, we can use the equation:

Δ∘rxn(T2) = Δ∘rxn(T1) + ΔH∘(products) - ΔH∘(reactants)

where;

Using the data from the table of thermodynamic properties, we can look up the enthalpy change of formation values for C2H4(g), H2O(l), and C2H5OH(l):

ΔH∘f(C2H4(g)) = 52.26 kJ/mol

ΔH∘f(H2O(l)) = -285.83 kJ/mol

ΔH∘f(C2H5OH(l)) = -277.69 kJ/mol

Substituting these values into the equation, we get:

Δ∘rxn(25.0 ∘C) = -44.2 kJ + (-277.69 kJ/mol) - (-52.26 kJ/mol)

Δ∘rxn(25.0 ∘C) = -44.2 kJ - (-277.69 kJ/mol) + 52.26 kJ/mol

Δ∘rxn(25.0 ∘C) = -44.2 kJ + 277.69 kJ/mol + 52.26 kJ/mol

Δ∘rxn(25.0 ∘C) = 233.23 kJ/mol

So the value of Δ∘rxn at 25.0 ∘C is 233.23 kJ/mol.

In which direction is the reaction, as written, spontaneous at 25 ∘C and standard pressure?

Since the value of Δ∘rxn at 25.0 ∘C is positive (233.23 kJ/mol), the reaction as written is not spontaneous at this temperature and standard pressure. The correct answer is "reverse."

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The tennis ball has a kinetic energy of around 56.8 J. The aircraft has a kinetic energy of around 4.43 x 10⁹ J. The hot air balloon travels at a speed of around 9.0 m/s.

How much effort must be put into slowing down a 750 kg automobile from 100 km/h to 50 km/h. We know that the of this automobile at 50.0 km/h is 72,300 Joules from the last example problem.

Ek = 0.5 x 0.058 kg x (46 m/s)²

Ek = 0.5 x 0.058 kg x 2116 m²/s²

Ek = 56.8468 J

Ek = 0.5mv²

Ek = 0.5 x 2.15 x 10⁵ kg x (255 m/s)²

Ek = 0.5 x 2.15 x 10⁵ kg x 65025 m²/s²

Ek = 4.433 x 10⁹ J

Ek = 0.5mv²

v = √(2Ek/m)

v = √(2 x 76550 J / 1890 kg)

v = √(81.011 J/kg)

v = 9.0 m/s (approx.)

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To draw the two circles, we would need to draw a smaller circle with a diameter of 2,532.5 miles (representing the moon) and a larger circle with a diameter of 75,974.4 miles (representing the Earth) that is 30 times larger than the smaller circle.

If we assume that the larger circle represents the Earth, then the diameter of the Earth would be 30 times the diameter of the smaller circle representing the moon. Let's say that the diameter of the smaller circle is x. Then the diameter of the larger circle (Earth) would be 30 times x or 30x.

To find the correct distance from Earth to the moon at this scale, we need to know the actual distance from Earth to the moon, which is approximately 238,855 miles or 384,400 kilometers. If we divide this distance by the scale factor of 30, we get:

238,855 miles / 30 = 7,961.8 miles

Therefore, the diameter of the smaller circle (moon) would be approximately 7,961.8 miles / π = 2,532.5 miles (rounded to one decimal place). And the diameter of the larger circle (Earth) would be 30 times that or 75,974.4 miles

So, to draw the two circles, we would need to draw a smaller circle with a diameter of 2,532.5 miles (representing the moon) and a larger circle with a diameter of 75,974.4 miles (representing the Earth) that is 30 times larger than the smaller circle.

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Answer:NH3: 4.00 moles

F2: 4.00 moles

Explanation:The balanced equation for the given chemical reaction is:

NH3(g) + F2(g) → NF3(g) + HF(g)

According to the balanced equation, 1 mole of NH3 reacts with 1 mole of F2 to produce 1 mole of NF3 and 1 mole of HF.

To produce 4.00 moles of HF, we need to determine how many moles of NH3 and F2 are required. Since the mole ratio between NH3 and HF is 1:1, we would need 4.00 moles of NH3. Similarly, since the mole ratio between F2 and HF is also 1:1, we would need 4.00 moles of F2 as well.

So, the answer is:

NH3: 4.00 moles

F2: 4.00 moles

The standard change in Gibbs free energy of the reaction at 25 ∘C is -1.69 kJ/mol.

What is standard change?

To find the standard change in Gibbs free energy of the reaction, we need to use the following equation:

ΔG° = -RT ln(K)

where ΔG° is the standard change in Gibbs free energy, R is the gas constant (8.314 J/mol·K), T is the temperature in Kelvin (25 °C = 298 K), and K is the equilibrium constant.

To find K, we need to use the equilibrium partial pressures:

K = (PC × PD) / (PA × PB²)

where PA, PB, PC, and PD are the equilibrium partial pressures of A, B, C, and D, respectively.

Substituting the values, we get:

K = (5.47 atm × 5.63 atm) / (5.63 atm × (5.00 atm)²)

K = 0.6176

Now we can calculate the standard change in Gibbs free energy:

ΔG° = -RT ln(K)

ΔG° = -(8.314 J/mol·K) × (298 K) × ln(0.6176)

ΔG° = -1,690 J/mol or -1.69 kJ/mol

Therefore, the standard change in Gibbs free energy of the reaction at 25 ∘C is -1.69 kJ/mol.

What is free energy?

Free energy, also known as Gibbs free energy, is a thermodynamic quantity that represents the amount of energy in a system that is available to do work at a constant temperature and pressure. It is denoted by the symbol G and is expressed in units of joules (J) or calories (cal).

In simple terms, free energy is the energy that can be used to do work. It is defined by the equation:

ΔG = ΔH - TΔS

where ΔH is the change in enthalpy (heat content) of the system, ΔS is the change in entropy (disorder) of the system, and T is the absolute temperature in Kelvin.

If ΔG is negative, the reaction is spontaneous and can proceed without the input of external energy. If ΔG is positive, the reaction is non-spontaneous and requires energy input to proceed. If ΔG is zero, the system is at equilibrium.

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Since vanadium is a transition metal and sulfate is an anion, we can insist that V(SO4)2

is an ionic compound.

Answer:

V(SO4)2 is ionic

Explanation:

In this compound, Vanadium (V) is a transition metal with an oxidation state of +5, and sulfate (SO4) is a polyatomic ion with a charge of -2. The compound is formed by the transfer of two electrons from each sulfur atom to the vanadium atom. This results in the formation of two V3+ cations and one SO42- anion, which combine to form V(SO4)2.

Ionic compounds are formed by the transfer of electrons between atoms or ions, resulting in the formation of positively charged cations and negatively charged anions. These oppositely charged ions are held together by strong electrostatic forces, forming a crystalline lattice structure.

In conclusion, V(SO4)2 is an ionic compound formed by the transfer of electrons from the sulfate ion to the vanadium ion.

Answer:

acid +metal ----->salt +hydrogen

Answer: three

Explanation:

The mass of diphosphorus pentoxide produced is: 549.47 g

What is mass?

Mass is a measure of the amount of matter in an object. It is typically measured in units of grams (g) or kilograms (kg). Mass is a scalar quantity and is different from weight, which is the force exerted on an object due to gravity and depends on both the mass of the object and the acceleration due to gravity.

The balanced chemical equation for the reaction between phosphorus and oxygen to produce diphosphorus pentoxide is:

[tex]4P[/tex] + [tex]5O_{2}[/tex] → [tex]2P_{4}O_{10}[/tex]

To solve the problem, we need to first calculate the amount of phosphorus required to react with 38.76 grams of oxygen. Since phosphorus is in excess, the amount of diphosphorus pentoxide produced will be limited by the amount of oxygen.

The molar mass of oxygen is 15.999 g/mol. Therefore, the number of moles of oxygen in 38.76 grams is:

38.76 g / 15.999 g/mol = 2.422 mol

According to the balanced equation, 5 moles of oxygen react with 4 moles of phosphorus to produce 2 moles of diphosphorus pentoxide. Therefore, the number of moles of phosphorus required is:

4/5 × 2.422 mol = 1.9376 mol

The molar mass of diphosphorus pentoxide is 283.886 g/mol. Therefore, the mass of diphosphorus pentoxide produced is:

1.9376 mol × 283.886 g/mol = 549.47 g

Rounding to the hundredths of a gram, the answer is:

549.47 g → 549.47

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The correct answer that represents beta decay is

In beta decay, a neutron in the nucleus is converted into a proton, and an electron (or beta particle) and an antineutrino are emitted from the nucleus.

In this case, a neutron in the 164Gd nucleus is converted into a proton, and an electron is emitted from the nucleus, resulting in the production of 164Tb.

Option A is not a valid representation of any known type of radioactive decay.

Option B represents alpha decay, in which an alpha particle is emitted from the nucleus.

Option C represents electron capture, in which an electron is captured by the nucleus.

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The elements that have an outer electron configuration of ms2nd2 are located in the d-block of the periodic table and include some of the transition metals and lanthanides.

To determine which elements in the periodic table have this outer electron configuration, you can look at the position of the d-block elements in the table. The d-block elements are located in the middle of the table and include the transition metals. These elements have partially filled d orbitals, which can accommodate up to 10 electrons.

Elements in the d-block with an atomic number of 21 through 30 (scandium through zinc) have an outer electron configuration of d10s2 and do not fit the ms2nd2 configuration. However, elements in the d-block with an atomic number of 39 through 48 (yttrium through cadmium) have an outer electron configuration of d10s2p1 and can have the ms2nd2 configuration by removing the single electron in the p orbital. Elements in the d-block with an atomic number of 57 through 80 (lanthanum through mercury) also have the possibility of having an outer electron configuration of ms2nd2.

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The statement "Plasmas can change shape" and "Plasmas contain ionized particles" best describe plasmas.

Plasma is a state of matter that is similar to gas but differs in that it contains ionized particles, which are atoms or molecules that have lost or gained one or more electrons. This results in a mixture of positively charged ions and negatively charged electrons, making plasma electrically conductive.

Plasma can be found in many natural phenomena such as lightning, stars, and the aurora borealis, and it is also used in various technological applications such as plasma TVs, fusion reactors, and fluorescent lights. Because of its unique properties, plasma has many interesting and useful applications in fields such as physics, chemistry, and engineering.

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The final temperature is -160°C

We can use the combined gas law, which relates the pressure, volume, and temperature of a gas:

(P₁V₁)/T₁ = (P₂V₂)/T₂

Where

In this case, we can assume that the pressure of the gas is constant, since it is not given in the problem statement. So we can simplify the equation to:

(V₁/T₁) = (V₂/T₂)

Where

We are given that the initial volume (V₁) is 80 L and the final volume (V₂) is twice that, or 160 L. We are also given that the initial temperature (T₁) is -40°C. To find the final temperature (T₂), we can plug these values into the equation:

(V₁/T₁) = (V₂/T₂)

(80 L)/(-40°C) = (160 L)/T₂

Simplifying:

-2 L/°C = (160 L)/T₂

Multiplying both sides by -1°C/2 L (the reciprocal of -2 L/°C):

1/2 = (T₂)/(160 L) x (-1°C/2 L)

1/2 = -T₂/320

Multiplying both sides by -1 to isolate T₂:

-1/2 = T₂/320

T₂ = -160°C

Therefore, the final temperature is -160°C.

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According to the question the standard change in Gibbs free energy is 2818.4 kJ/mol.

The capacity to perform work is energy. It is a characteristic of all matter and can assume many different shapes. It exists in a variety of shapes, including those of light, heat, chemical, electrical, mechanical, and nuclear. Energy is the ability to accomplish work and is measured in joules, which are equivalent to the amount of work completed when one newton of force is applied over a one metre distance.

The following equation can be used to get the reaction's standard change in Gibbs free energy (ΔG°) at 25°C:

ΔG° = [4 ΔG°f ([tex]Co_2[/tex]) + 6 ΔG°f ([tex]H_2o[/tex])] - [2 ΔG°f ([tex]C_2H_6[/tex]) + 7 ΔG°f ([tex]o_2[/tex])]

At 25°C, ΔG°f ([tex]Co_2[/tex]) = -393.5 kJ/mol, ΔG°f ([tex]H_2o[/tex]) = -237.2 kJ/mol, ΔG°f ([tex]C_2H_6[/tex]) = -85.2 kJ/mol, and ΔG°f ([tex]o_2[/tex]) = 0 kJ/mol.

As a result, the typical variation in Gibbs free energy is:

ΔG° = [-393.5 kJ/mol × 4] + [-237.2 kJ/mol × 6] - [-85.2 kJ/mol × 2] - [0 kJ/mol × 7]

ΔG° = -2818.4 kJ/mol.

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2818.4 kJ/mol is  the standard change in Gibbs free energy for the reaction at 25 °C.

What does the name Gibbs free energy mean?

Because it is readily accessible at all times, Gibb's free energy is known as free energy. If necessary, the reaction can obtain this energy without exerting any effort. Enthalpy and the system's product of temperature and entropy are added to determine the change in Gibb's free energy.

Enthalpy and entropy are combined into a single quantity known as Gibbs free energy, or G. The product of the system's temperature and entropy, added to the enthalpy, equals the change in free energy, or G.

2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(g)

ΔG° = [4 ΔG°f (CO2) + 6 ΔG°f (H2O)] - [2 ΔG°f (C2H6) + 7 ΔG°f (O2)]

At 25°C, ΔG°f (CO2) = -393.5 kJ/mol,

ΔG°f (H2O) = -237.2 kJ/mol,

ΔG°f (C2H6) = -85.2 kJ/mol,

and ΔG°f (O2) = 0 kJ/mol.

ΔG° = [-393.5 kJ/mol × 4] + [-237.2 kJ/mol × 6] - [-85.2 kJ/mol × 2] - [0 kJ/mol × 7] = -2818.4 kJ/mol.

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The answer is A --------