Please fill out blanks
Formula
A. Na₂CO3
B. Na₂CO3
C. Na₂CO3
D. H₂C₂O4
E. H₂C₂O4
Molar mass (g/mol)
A. _____
B.______
C._______
D._______
E._________
# of particles
A.1.204*10^24
B.8.62*10^23
C. ____*10^____
D. ____*10^____
E. ____*10^____
# of moles
A._____
B._____
C.0.750
D._____
E.4.82
Mass(g)
A._____
B._____
C.______
D.225
E._____

The units of the rate constant for the reaction are determined by analyzing the rate law equation. Since the given rate law is rate = [tex]k[NO2]^2[/tex], the units of the rate constant (k) can be calculated by considering the units of concentration and time.

In the given rate law, the concentration of NO2 ([NO2]) is squared. Therefore, the units of the rate constant (k) must compensate for this. By analyzing the rate law equation, we can deduce the units of k.

Let's consider the units of concentration first. The concentration of NO2 is typically expressed in units of mol/L or M (molarity). In this case, since [tex][NO2]^2[/tex] appears in the rate law, the units of concentration become [tex](mol/L)^2[/tex] or [tex]M^2[/tex].

The rate is typically expressed in units of mol/(L·s) or M/s. To make the units of rate (M/s) compatible with the units of concentration (M^2), the units of the rate constant (k) should be (1/s) or [tex]s^-1[/tex].

Therefore, the units of the rate constant (k) for the given reaction with the rate law rate = [tex]k[NO2]^2[/tex] are [tex]s^-1[/tex] or 1/s. This indicates that the rate constant represents the rate of reaction per unit time.

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So, there are approximately [tex]1.8 * 10^{-5[/tex] grams of water produced from the decomposition of 75.5 grams of iron(III) hydroxide.  

The number of water molecules produced from the decomposition of 75.5 grams of Iron (III) hydroxide [tex](Fe(OH)_3)[/tex] can be calculated using the following formula:

Number of water molecules = Mass of iron(III) hydroxide x Decomposition constant for iron(III) hydroxide

The decomposition constant for iron(III) hydroxide is typically given as [tex]2.3 * 10^{-6,[/tex] which means that for every 100 grams of iron(III) hydroxide, [tex]2.3 * 10^{-6,[/tex]   grams of water are produced through decomposition.

Therefore, the number of water molecules produced from the decomposition of 75.5 grams of iron(III) hydroxide can be calculated as follows:

Number of water molecules = 75.5 grams * [tex]2.3 * 10^{-6,[/tex] grams/100 grams =  [tex]1.8 * 10^{-5[/tex] grams

So, there are approximately  [tex]1.8 * 10^{-5[/tex] grams of water produced from the decomposition of 75.5 grams of iron(III) hydroxide.  

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The part of the nephron responsible for maintaining the hypertonic environment and facilitating the reabsorption of water by osmosis is the Loop of Henle, specifically the descending limb and the ascending limb.

The Loop of Henle plays a crucial role in the concentration and dilution of urine. It consists of a descending limb, a hairpin turn called the thin segment, and an ascending limb.

The descending limb of the Loop of Henle is permeable to water but not to ions, meaning water can passively diffuse out of the tubule into the surrounding interstitial fluid due to the increasing osmolarity of the medulla (the inner region of the kidney). As the filtrate descends through the descending limb, water is reabsorbed, leading to concentration of the filtrate.

The ascending limb of the Loop of Henle, specifically the thick ascending limb, is impermeable to water but actively transports ions, such as sodium (Na+), out of the tubule and into the interstitial fluid. This creates a high concentration of ions in the medulla, leading to a hypertonic environment. Since the filtrate in the ascending limb is not permeable to water, it remains dilute.

This hypertonic environment in the medulla, created by the active transport of ions in the ascending limb, establishes an osmotic gradient that allows for the reabsorption of water in subsequent parts of the nephron, such as the distal convoluted tubule and collecting duct, by osmosis. The reabsorption of water in these regions is regulated by the hormone antidiuretic hormone (ADH), also known as vasopressin, which acts on the collecting duct to increase water permeability and further concentrate the urine.

Therefore, the Loop of Henle, particularly the descending and ascending limbs, is responsible for creating and maintaining the hypertonic environment necessary for water reabsorption by osmosis.

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The washing step with 5% aqueous sodium bicarbonate is commonly used to remove any remaining acidic impurities in the crude mixture.

During the synthesis of banana oil, the reaction produces acetic acid as a byproduct. This acid needs to be neutralized in order to prevent it from reacting with the alcohol and ester products. By washing the crude mixture with sodium bicarbonate, any remaining acetic acid will be converted into sodium acetate which is water-soluble and can be easily removed. Additionally, sodium bicarbonate is a mild base which can help to remove any residual water-soluble impurities in the mixture. Therefore, this washing step is crucial for obtaining a pure product in the banana oil synthesizing experiment.
During the banana oil synthesis experiment, the crude mixture was washed twice with 1 ml of 5% aqueous sodium bicarbonate to remove any impurities and unreacted acidic components. This washing step helps neutralize any remaining acids and facilitates the separation of the desired ester, banana oil, from other byproducts. The sodium bicarbonate reacts with acidic compounds, converting them into water-soluble salts, which can then be easily removed from the organic layer containing banana oil. This washing step improves the purity and overall yield of the final product.

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Most enzymes are deactivated permanently above a temperature of about 50 °C

The correct answer is option  E. 50 °C

Enzymes are generally globular proteins, acting alone or in larger complexes. Like all proteins, enzymes are linear chains of amino acids that fold to produce a three-dimensional structure. The sequence of the amino acids specifies the structure which in turn determines the catalytic activity of the enzyme.

Although structure determines function, a novel enzyme's activity cannot yet be predicted from its structure alone. Enzyme structures unfold (denature) when heated or exposed to chemical denaturants and this disruption to the structure typically causes a loss of activity

Enzymes are biological catalysts that speed up chemical reactions in living organisms. However, they have an optimal temperature range within which they function efficiently. Above this range, enzymes can become deactivated, losing their functionality. Generally, most enzymes are permanently deactivated above a temperature of about 50 °C.

The correct answer is option  E. 50 °C

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The change in entropy for the combustion of ethane is -9.4 J/(mol*K).

Change in entropy for the combustion of ethane, we need to use the standard entropy values of the reactants and products.

The balanced chemical equation for the combustion of ethane is:

C₂H₆ + 7/2 O₂ → 3H₂O(g) + 2CO₂

The standard entropy values for each species involved are:

ΔS°(C₂H₆) = 229.5 J/(molK)

ΔS°(O₂) = 205.0 J/(molK)

ΔS°(H₂O(g)) = 188.7 J/(molK)

ΔS°(CO₂) = 213.6 J/(molK)

The change in entropy for the reaction is given by the difference between the sum of the standard entropies of the products and the sum of the standard entropies of the reactants, multiplied by the stoichiometric coefficients. Therefore:

ΔS° = [3ΔS°(H₂O(g)) + 2ΔS°(CO₂)] - [ΔS°(C₂H₆) + (7/2)ΔS°(O₂)]

ΔS° = [3(188.7 J/(molK)) + 2(213.6 J/(molK))] - [229.5 J/(molK) + (7/2)(205.0 J/(molK))]

ΔS° = 705.9 J/(molK) - 715.3 J/(molK)

ΔS° = -9.4 J/(mol*K)

The negative sign indicates that the reaction leads to a decrease in entropy, which is expected since the reactants have more degrees of freedom than the products.

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Compounds A and D (Al(OH)3 and Mg(OH)2) are insoluble hydroxide compounds.

The solubility of hydroxide compounds can vary, so let's determine the solubility of each compound:

A. Al(OH)3 (aluminum hydroxide): Insoluble (precipitate forms)

B. Ba(OH)2 (barium hydroxide): Soluble

C. KOH (potassium hydroxide): Soluble

D. Mg(OH)2 (magnesium hydroxide): Insoluble (partially soluble, forms a precipitate)

E. NaOH (sodium hydroxide): Soluble

Based on this information, the insoluble hydroxide compounds are:

A. Al(OH)3

D. Mg(OH)2

Therefore, compounds A and D (Al(OH)3 and Mg(OH)2) are insoluble hydroxide compounds.

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There are four d electrons in the valence shell of the Mo2+ cation. There are two unpaired electron spins.

The Mo2+ cation has a total of 42 electrons. Its electronic configuration is [Kr] 4d4 5s0. In the Mo2+ cation, the 4d orbital is completely filled and there are four d electrons in the valence shell.  

To determine the number of unpaired electron spins, we need to apply Hund's rule. According to Hund's rule, electrons in orbitals with the same energy level will occupy empty orbitals singly before they pair up. Therefore, the four d electrons will occupy the four degenerate orbitals singly, resulting in two unpaired electron spins.

In summary, the Mo2+ cation has four d electrons in the valence shell and two unpaired electron spins.

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The formation of a positive ion by lithium is characteristic of alkali metals, which generally have low ionization energies, making it easier for them to lose electrons and acquire a stable configuration.

Lithium (Li) is located on the periodic table in Group 1, Period 2. Group 1 elements are known as the alkali metals, which are found in the first column on the left-hand side of the table. Period 2 refers to the second horizontal row from the top. Lithium is the first element in this row and has an atomic number of 3.

In terms of ion formation, lithium will typically form a positive ion, or cation, by losing one electron. The electronic configuration of lithium is 1s² 2s¹, meaning it has two electrons in the first energy level (K shell) and one electron in the second energy level (L shell).

In order to achieve a stable electron configuration, lithium will readily lose its single valence electron in the 2s orbital to attain the electron configuration of helium (1s²) with a completely filled K shell. As a result, lithium forms the Li+ ion, which has a charge of +1 due to the loss of the negatively charged electron.

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The percentage of salt in the saturated solution would be approximately 26.31%.

Percentage of salt = (mass of salt/mass of solution) * 100

= (35.7 g / (35.7 g + 100 g)) * 100

= (35.7 g / 135.7 g) * 100

≈ 26.31%

A saturated solution refers to a solution in which the maximum amount of solute has been dissolved in a given solvent at a particular temperature and pressure. In simpler terms, it is a solution where no more solute can dissolve. At this point, the solution is said to be in equilibrium because the rate of dissolution of solute particles is equal to the rate of precipitation or crystallization of solute particles.

To achieve a saturated solution, one typically adds solute to a solvent while continuously stirring until no more solute can dissolve, or until some undissolved solute remains in the solution. The solubility of a substance is influenced by factors such as temperature, pressure, and the nature of the solute and solvent.

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(a) To ionize a He+ ion in its ground state, you need a photon with energy greater than or equal to the ionization energy of He+.

The ionization energy of He+ is 24.59 eV (electron volts), which is equivalent to 3.94 × [tex]10^{-18}[/tex] J (joules).

The minimum frequency of the photon required to ionize He+ can be calculated using the formula:

E = hf

where E is the energy of the photon, h is Planck's constant (6.626 × 1[tex]0^{-34}[/tex] J·s), and f is the frequency of the photon.

Rearranging the formula to solve for f, we get:

f = E/h

Substituting the ionization energy of He+ for E, and Planck's constant for h, we get:

f = (24.59 eV) / (6.626 × [tex]10^{-34[/tex] J·s) = 3.69 × [tex]10^{15[/tex] Hz

Therefore, the minimum frequency of a photon required to ionize a He+ ion in its ground state is 3.69 × [tex]10^{15[/tex] Hz.

(b) To ionize a Li2+ ion in its first excited state, you need a photon with energy greater than or equal to the energy difference between the first excited state and the ionization energy of Li2+.

The ionization energy of Li2+ is 122.45 eV, and the energy of the first excited state is 11.18 eV higher than the ground state. Therefore, the energy required to ionize the Li2+ ion in its first excited state is:

E = 122.45 eV + 11.18 eV = 133.63 eV

This is equivalent to 2.14 × [tex]10^{-17[/tex] J.

Using the same formula as before, we can calculate the minimum frequency of the photon required to ionize the Li2+ ion in its first excited state:

f = E/h = (2.14 × [tex]10^{-17[/tex] J) / (6.626 × [tex]10^{-34[/tex] J·s) = 3.23 × [tex]10^{16[/tex] Hz

Therefore, the minimum frequency of a photon required to ionize a Li2+ ion in its first excited state is 3.23 × [tex]10^{-17[/tex] Hz.

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The characteristics that are used to differentiate among stars is  temperature and size.

option A.

Stars are self-luminous as they radiate heat and light energy. Stars use hydrogen gas as fuel. Stars rotate about their own galaxy. Stars rotate about the center of a galaxy.

The main characteristics of stars include the following;

The  stars seem to be made up of similar chemical elements, the characteristics that are used to differentiate among stars is  temperature and size.

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To calculate the standard cell potential, we use the formula:

ε°cell = ε°(reduction at cathode) - ε°(oxidation at anode)

From the given cell notation, we can see that the reduction half-reaction occurs at the cathode (Ag+ + e- → Ag), and the oxidation half-reaction occurs at the anode (Cu → Cu2+ + 2e-).

The standard reduction potential of the Ag+|Ag half-cell is +0.800 V, and the standard reduction potential of the Cu2+|Cu half-cell is +0.340 V.

So,

ε°cell = ε°(reduction at cathode) - ε°(oxidation at anode)

       = +0.800 V - (+0.340 V)

      = +0.460 V

This is the given standard cell potential (ε°cell).

To calculate the cell potential (ε) at 25°C under non-standard conditions, we use the Nernst equation:

ε = ε°cell - (RT/nF) ln(Q)

Where R is the gas constant (8.314 J/mol*K), T is the temperature in Kelvin (298 K), n is the number of moles of electrons transferred in the balanced cell reaction (2 in this case), F is the Faraday constant (96,485 C/mol), and Q is the reaction quotient.

The reaction quotient (Q) is calculated using the concentrations of the species involved in the cell reaction.

Q = ([Ag+] / [Cu2+]) = (0.17 M / 0.018 M) = 9.44

Plugging in all the values, we get:

ε = ε°cell - (RT/nF) ln(Q)

    = 0.460 V - (8.314 J/mol*K * 298 K / (2 * 96,485 C/mol) * ln(9.44))

    = 0.356 V

Therefore, the cell potential (ε) at 25°C under the given non-standard conditions is 0.356 V.

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The bond angles in a typical carbonyl group are approximately 120°.

The carbonyl group is composed of a carbon atom double-bonded to an oxygen atom, with two other groups attached to the carbon atom. The double bond between the carbon and oxygen atoms is a region of high electron density, causing the two groups attached to the carbon atom to be oriented in a trigonal planar geometry, resulting in a bond angle of approximately 120°. This is a typical example of a polar covalent bond, where there is an unequal sharing of electrons between the carbon and oxygen atoms, resulting in a molecule with an unequal charge distribution.

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The type of intermolecular force between NH₃ molecules is hydrogen bonding ONLY.

NH₃ (ammonia) is a polar molecule due to the presence of a lone pair of electrons on the central nitrogen atom. Each NH₃ molecule contains a nitrogen atom bonded to three hydrogen atoms.

The nitrogen atom is more electronegative than hydrogen, creating a dipole moment where nitrogen carries a partial negative charge (δ-) and each hydrogen carries a partial positive charge (δ+).

Hydrogen bonding occurs when a hydrogen atom is bonded to a highly electronegative atom (such as nitrogen, oxygen, or fluorine) and forms a weak bond with the lone pair of electrons on another electronegative atom. In NH₃, the hydrogen atoms can form hydrogen bonds with the lone pairs of electrons on neighboring NH₃ molecules.

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The compound with the condensed formula C [tex]H3C = O C (C H3)3[/tex] is classified as an ester.

The condensed formula C H3C = O C (C H3)3 represents a compound with the following structure:

    CH3

     |

O = C - C(CH3)3

This compound belongs to the functional class of esters. Esters are organic compounds that are derived from carboxylic acids by replacing the -OH group with an -OR group, where R represents an alkyl or aryl group. In this case, the ester group is represented by the structure -O C (C H3)3, where C represents the carbonyl carbon, and (C H3)3 represents the tert-butyl group (three methyl groups attached to a central carbon atom).

Therefore, the compound with the condensed formula C H3C = O C (C H3)3 is classified as an ester.

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The value of Keq for this reaction is 159.4.

To calculate the value of Keq, we need to use the equilibrium expression: Keq = [HI]^2 / ([H2][I2]). Plugging in the given concentrations, we get:
Keq = (0.55M)^2 / ((0.15M)(0.033M)) = 159.4
Therefore, the value of Keq for this reaction is 159.4. This indicates that the reaction strongly favors the products (HI), as the Keq value is much greater than 1. This means that at equilibrium, there are higher concentrations of products than reactants, and the forward reaction is more favorable. It's important to note that Keq is a constant value for a particular reaction at a specific temperature, and it helps us predict how the reaction will proceed towards equilibrium based on the initial concentrations of reactants and products.

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Answer:

1 . ans = five ways activities people did in dry season they are :

i) going to park

ii) playing out doors sports

iii) swimming

iv) mountain hiking

v) go on a picnic

__________________________________________

2 . ans = linen and light cotton fabrics clothes they wears.

hello

the answer is:

NH4NO3 (g) ----> N2O (g) + 2H2O (g)

therefore coefficient for water is 2

The energy of a photon with a frequency of 46.0 MHz is approximately 0.60 eV.

To calculate the energy of a photon in electron volts (eV), you can use the formula:

Energy (eV) = Planck's constant (h) × frequency (ν) / elementary charge (e)

Where:

- Planck's constant (h) = 4.135667696 × 10^-15 eV s

- Frequency (ν) is in hertz (Hz)

- Elementary charge (e) = 1.602176634 × 10^-19 C

For the first frequency, 6.20 × 10^2 Hz:

Energy = (4.135667696 × 10^-15 eV s) × (6.20 × 10^2 Hz) / (1.602176634 × 10^-19 C)

Calculating this expression:

Energy ≈ 25.48 eV

Therefore, the energy of a photon with a frequency of 6.20 × 10^2 Hz is approximately 25.48 eV.

For the second frequency, 3.10 GHz:

Energy = (4.135667696 × 10^-15 eV s) × (3.10 × 10^9 Hz) / (1.602176634 × 10^-19 C)

Calculating this expression:

Energy ≈ 7.64 eV

Therefore, the energy of a photon with a frequency of 3.10 GHz is approximately 7.64 eV.

For the third frequency, 46.0 MHz:

Energy = (4.135667696 × 10^-15 eV s) × (46.0 × 10^6 Hz) / (1.602176634 × 10^-19 C)

Calculating this expression:

Energy ≈ 0.60 eV

Therefore, the energy of a photon with a frequency of 46.0 MHz is approximately 0.60 eV.

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When 0.0050 mol of NaOH is added to a solution while keeping the volume constant, the reaction between NaOH and the existing species in the solution occurs.

Depending on the specific chemical components present, various reactions may take place, leading to changes in the solution's composition.

The reaction could involve acid-base neutralization if there are acidic species present, resulting in the formation of water and a corresponding salt.

Alternatively, if the solution contains metal ions, a precipitation reaction might occur, forming insoluble metal hydroxides.

Additionally, if the solution contains reactive functional groups, such as carbonyl or carboxyl groups, the added NaOH could lead to chemical transformations through nucleophilic addition or deprotonation.

The exact nature of the reaction and resulting changes in the solution will depend on the specific chemical species and their reactivity.

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The correct option is: Glass; viscous liquid; rubbery solid

The correct representation for the sequential change in mechanical state with increasing temperature for an amorphous polymer is:

Glass; viscous liquid; rubbery solid

At low temperatures, the amorphous polymer is in a glassy state, where the molecular motion is restricted, and the material is rigid and brittle. As the temperature increases, the polymer undergoes a transition to a viscous liquid state, where the molecular motion increases, and the material becomes more flowable and less rigid. Finally, at even higher temperatures, the polymer enters the rubbery solid state, where the material is flexible, elastic, and exhibits significant molecular motion.

Therefore, the correct option is: Glass; viscous liquid; rubbery solid

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The final volume of the balloon, when cooled to -39 degrees Celsius, is approximately 853 mL (rounded to the nearest 1 mL).

To solve this problem, we can use Charles's Law, which states that the volume of a gas is directly proportional to its temperature when pressure is held constant. The equation is given as:

V1/T1 = V2/T2

Where V1 and T1 are the initial volume and temperature, and V2 and T2 are the final volume and temperature.

Given:

V1 = 1,090 mL

T1 = 27°C = 27 + 273.15 = 300.15 K

T2 = -39°C = -39 + 273.15 = 234.15 K

Using the equation, we can rearrange it to solve for V2:

V2 = (V1 * T2) / T1

V2 = (1,090 * 234.15) / 300.15

V2 ≈ 852.71 mL

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The disproportionation reaction of the radicals produced by the most energetically favored homolytic bond cleavage in the molecule CH3-CH2-CH-CH2-CH3 would form the alkane-alkene pair CH4 and (CH3)2C=C(CH3)2.                                  

The most energetically favored homolytic bond cleavage in the given molecule would be the one between the two carbon atoms in the middle of the chain, resulting in two radicals - one with a methyl group and the other with a propyl group. To form an alkene, these radicals need to combine in a way that would lead to the formation of a double bond. Among the given options, only option C has two radicals that can combine to form a double bond between the second and third carbon atoms, resulting in the alkene CH2=CH-CH=CH-CH3. Therefore, the answer is (C) CH3CH2CH2 and CH2=C(CH3)CH=CH2.
The primary carbon radical formed after cleavage will react with a secondary carbon radical, leading to the formation of methane (CH4) and the alkene, 2,3-dimethyl-2-butene [(CH3)2C=C(CH3)2].

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Based on the information provided, it seems there is a missing compound or structure in the question.

The given compound "H H CH" does not specify the complete structure or functional groups involved, making it difficult to determine its behavior in the presence of a base.

Racemization typically refers to the interconversion of enantiomers, which occurs when a chiral compound undergoes a reaction and produces an equal mixture of both the R and S configurations.

However, without a clear understanding of the compound or functional groups involved, it is not possible to accurately determine if racemization would occur.

If you provide more specific information about the compound or its functional groups, I can assist you further in determining whether racemization would occur in the presence of a base.

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To make a phosphate buffer with a pH of 7.40, we need to select an acid and its conjugate base with pKa values that bracket the desired pH. In this case, the pKa values of phosphoric acid (H3PO4) are 2.16, 7.21, and 12.32.

We want the pH to be higher than the pKa of the acid and lower than the pKa of the conjugate base. From the given pKa values, the pH of 7.40 falls between the pKa values of 7.21 and 12.32.

Therefore, we would use the acid with pKa 7.21 and its conjugate base with pKa 12.32.

The correct choice for the acid and conjugate base pair would be:

b) NaH2PO4 (dihydrogen phosphate) and Na2HPO4 (monohydrogen phosphate)

This combination of NaH2PO4 (the acid) and Na2HPO4 (the conjugate base) can be used to prepare a phosphate buffer with a pH of 7.40.

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Avogadro's number can be calculated by dividing the faraday constant by the charge on an electron.

The faraday constant is equal to the charge of one mole of electrons, which is 96,480 coulombs. This means that one mole of electrons contains 96,480 coulombs of charge.

To calculate Avogadro's number, we need to find the number of electrons in one coulomb of charge. This is given by the charge on an electron, which is 1.6022 x 10^-19 coulombs. So, one coulomb of charge contains 1 / (1.6022 x 10^-19) = 6.2415 x 10^18 electrons.

Dividing the faraday constant by the charge on an electron gives:

Avogadro's number = 96,480 / (1.6022 x 10^-19) / 6.2415 x 10^18 = 6.022 x 10^23

Therefore, Avogadro's number is approximately 6.022 x 10^23, which is the number of particles (atoms or molecules) in one mole of a substance.

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Vegetable oil has a higher intermolecular force than acetone. This is due to the difference in the types of molecules present in each substance.

Acetone consists of molecules with only a single carbon-oxygen bond, while vegetable oil consists of molecules with multiple carbon-carbon and carbon-hydrogen bonds. The multiple bonds in vegetable oil create stronger intermolecular forces due to the increased number of electron-pair bonds between each molecule.

This is because more electrons are shared between molecules, creating a stronger attraction. The result is a greater intermolecular force, which is why vegetable oil has stronger intermolecular forces than acetone.

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correct question is :

what molecule has stronger intermolecular forces acetone or vegetable oil? and Why?

The equilibrium constant for the reaction at 298 K is 3.1 x 10^-10.

The equilibrium constant expression for the reaction is given by:

Kc = ([NO]^2)/([N2][O2])

where [NO], [N2], and [O2] are the equilibrium concentrations of the respective species.

At 298 K, the standard free energy change (ΔG°) for the reaction is given by:

ΔG° = -RT ln Kc

where R is the gas constant and T is the temperature in Kelvin.

Using the given values:

ΔG° = 198.4 kJ/mol

R = 8.314 J/mol·K

T = 298 K

ΔG° = -8.314 J/mol·K × 298 K × ln Kc / 1000 J/kJ + 198.4 kJ/mol

-21.95 kJ/mol = ln Kc

Kc = e^-21.95 kJ/mol

Kc = 3.1 x 10^-10

Therefore, the equilibrium constant for the reaction at 298 K is 3.1 x 10^-10.

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