see photo please I have 5 mins !!

a.) The pH of a solution made by dissolving 450 mg of HBr in enough water to make 100 ml of solution is 1.68. b.) The pH of a solution made by dissolving 525 mg of Ba(OH)₂ in enough water to make 75 ml of solution is 13.17.

a) HBr is a strong acid, meaning it dissociates completely in water to produce H⁺ ions and Br⁻ ions. The concentration of H⁺ ions in a solution of HBr can be calculated using the formula pH = -log[H⁺], where [H⁺] is the concentration of H⁺ ions in moles per liter (M).

To calculate the concentration of H⁺ ions in the given solution, we first need to convert the mass of HBr to moles using its molar mass. The molar mass of HBr is 80.91 g/mol, so 450 mg of HBr corresponds to 0.00556 moles. The volume of the solution is 100 ml or 0.1 L.

Using the formula for concentration, we can calculate the concentration of H⁺ ions as [H⁺] = moles of HBr / volume of solution = 0.00556 moles / 0.1 L = 0.0556 M.

Finally, we can calculate the pH of the solution as pH = -log(0.0556) = 1.68.

b) Ba(OH)₂ is a strong base that dissociates completely in water to produce Ba²⁺ ions and OH⁻ ions. The concentration of OH⁻ ions in a solution of Ba(OH)₂ can be calculated using the formula pOH = -log[OH⁻], where [OH⁻] is the concentration of OH⁻ ions in moles per liter (M).

To calculate the concentration of OH⁻ ions in the given solution, we first need to convert the mass of Ba(OH)₂ to moles using its molar mass. The molar mass of Ba(OH)₂ is 171.34 g/mol, so 525 mg of Ba(OH)₂ corresponds to 0.00306 moles. The volume of the solution is 75 ml or 0.075 L.

Since Ba(OH)₂ dissociates into two OH⁻ ions per formula unit, the concentration of OH⁻ ions in the solution is twice the concentration of Ba(OH)₂, or [OH⁻] = 2 × moles of Ba(OH)₂ / volume of solution = 2 × 0.00306 moles / 0.075 L = 0.0816 M.

Finally, we can calculate the pOH of the solution as pOH = -log(0.0816) = 1.08. To convert this to pH, we use the relationship pH + pOH = 14, giving us pH = 14 - 1.08 = 13.17.

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The bonding that occurs between the atoms of a P4O10 molecule is covalent bonding. The correct option is a. This type of bonding involves the sharing of electrons between atoms.

In the case of P4O10, each phosphorous atom shares electrons with two oxygen atoms to form a double bond, resulting in a tetrahedral shape with four phosphorous atoms and ten oxygen atoms.

Covalent bonding is a common type of bonding in organic compounds, as it allows atoms to share electrons and form stable molecules. In the case of P4O10, the covalent bonding allows for the molecule to act as a dehydrating agent, meaning it can remove water molecules from other compounds in organic synthesis reactions.

Overall, the covalent bonding in P4O10 is essential for its function as a dehydrating agent in organic synthesis reactions and demonstrates the importance of understanding different types of chemical bonding in order to manipulate and control chemical reactions.

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If ΔGo for a reaction is equal to 0, then the reaction is in equilibrium and the equilibrium constant (K) must be equal to 1.

Hi, if ΔGo for a reaction is equal to 0, the equilibrium constant (K) for the reaction must be equal to 1. This means that the rate of the forward reaction is equal to the rate of the reverse reaction, resulting in no net change in the concentrations of the reactants and products over time.

This is because the relationship between ΔGo and K is given by the equation:

ΔGo = -RT ln(K)

Where:
ΔGo = standard Gibbs free energy change
R = gas constant (8.314 J/mol·K)
T = temperature in Kelvin
ln(K) = natural logarithm of the equilibrium constant

When ΔGo is equal to 0, the equation becomes:
0 = -RT ln(K)

To solve for K, we can rearrange the equation:
ln(K) = 0

Taking the inverse natural logarithm (exponential) of both sides:
K = e^0

Since e^0 is equal to 1, K must be equal to 1. This means that the reaction is at equilibrium, with the concentrations of reactants and products remaining constant over time.

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No, an optically inactive compound cannot rotate plane-polarized light.

A compound's capacity to rotate the plane of plane-polarized light is known as optical activity. This happens as a result of the compound's chiral core, which means that its mirror image cannot be superimposed. Enantiomers are the mirror images of chiral compounds that rotate plane-polarized light in opposing directions. The type of chemical and the light's wavelength affect how much spinning occurs.

A compound that is optically inactive, on the other hand, either lacks a chiral center or has an equal number of chiral centers with opposing configurations, making it possible to superimpose the molecule with its mirror copy. Optically inert substances do not spin plane-polarized light because there is no distinction between the substance and its mirror image.

It is significant to remember that some substances, despite having chiral centers, may look optically inactive. This is due to the possibility that the compound contains an equal amount of both enantiomers, whose competing optical activities cancel one another out. These substances, often known as racemic mixes or racemates, don't rotate plane-polarized light.

In conclusion, optically inactive chemicals lack chiral centers or have an equal number of chiral centers with opposing configurations, which prevents them from rotating plane-polarized light.

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Collagen is both intramolecularly and intermolecularly linked by covalent cross-links.

A fibrous protein known as collagen is made up of three polypeptide chains that are entangled in a triple helix configuration. Between the amino acid residues in each chain, hydrogen bonds hold these chains together intramolecularly.

The structural stability and tensile strength of collagen fibres are provided by covalent bonds, specifically by crosslinks originating from lysine, which are formed between collagen molecules. Enzymatic crosslinking, which involves the oxidation of lysine residues by enzymes like lysyl oxidase, is the process by which these crosslinks are produced.

For tissues like skin, bones, and cartilage to remain intact, covalent interactions between adjacent collagen molecules form a solid, insoluble network of fibres.

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For each reaction in Model 2, predict the number of electrons that must be involved in the reaction to make the charges in the reaction balance. Two electrons are required to balance the +2 charge on the reactant's side of the equation.

Reaction balance refers to the balancing of the number of reactant and product species in a chemical reaction, such that the total charge and total mass are conserved. This is achieved by adjusting the stoichiometric coefficients of each species in the chemical equation. In addition to balancing the mass of the species, it is also important to balance the charge in the reaction.

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The correct structure for lithium hypochlorite is A) LiClO. Lithium hypochlorite is an ionic compound composed of the Li⁺ cation and the ClO⁻ hypochlorite anion.

The ClO⁻ anion is formed by the combination of a Cl⁻ anion (chloride ion) and an O²⁻ anion (oxide ion), with one additional electron transferred from Cl to O.

The formula for lithium hypochlorite is LiClO, indicating that there is one Li⁺ cation and one ClO⁻ hypochlorite anion in the formula unit.

The structure of LiClO can be represented as follows:

O

│

Li ── Cl

where the Li⁺ ion is bonded to the ClO⁻ hypochlorite anion via ionic bonds. The ClO⁻ hypochlorite anion has a bent molecular geometry, with the Cl-O bond angle slightly less than 120° due to the lone pair on the O atom

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In redox reactions, the [tex]^G[/tex] (change in Gibbs free energy) value can be related to the reduction potential [tex](E^o)[/tex] through the following equation:

[tex]^G = -nFE^o[/tex]

where n is the number of electrons transferred, F is the Faraday constant, and [tex]E^o[/tex] is the standard reduction potential.

The reduction potential is a measure of the tendency of a species to undergo reduction (gain of electrons). More specifically, it is the tendency of a half-reaction to occur as a reduction half-reaction, as compared to a standard hydrogen electrode (SHE) under standard conditions. The reduction potential is usually reported in volts (V).

The sign of the [tex]^G[/tex] value and the reduction potential are related. If the [tex]^G[/tex] value is negative, the reaction is spontaneous, and the reduction potential will be positive. Conversely, if the [tex]^G[/tex] value is positive, the reaction is non-spontaneous, and the reduction potential will be negative.

In summary, the [tex]^G[/tex]  values and the reduction potentials are related through the equation [tex]^G = -nFE^o.[/tex]The sign of the [tex]^G[/tex]  value and the reduction potential are related, where a negative [tex]^G[/tex] value corresponds to a positive reduction potential, indicating a spontaneous reaction, and vice versa.

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SO[tex]_3[/tex] has dipole-dipole forces. Dipole-dipole interactions are the electrostatic interactions that occur between permanent polar molecules. Therefore, the correct option is option D.

Dipole-dipole forces and dipole-dipole interactions are the electrostatic interactions that occur between permanent polar molecules. Typically, the positive end of one molecule will draw the negative side of another. As a result, the two molecules get closer to one another, boosting the stability of the material. This interaction is not an ordinary ionic or covalent connection because it involves no transfer as well as exchange of electrons.  SO[tex]_3[/tex] has dipole-dipole forces.

Therefore, the correct option is option D.

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So, Na (Z=11) has the largest atomic radius among the given elements in the third period.

The element with the largest atomic radius among the given compounds is Na (Z=11) which is a group 1 element and has only one valence electron, leading to a larger atomic radius compared to the other elements in the third period.

1. List the elements given: Al (Z=13), Na (Z=11), Si (Z=14), and Cl (Z=17).
2. Understand that atomic radius generally decreases across a period from left to right due to an increase in effective nuclear charge.
3. Since Na is the farthest left element among the options provided, it has the largest atomic radius.

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The expression for the solubility product constant are

a) Ksp = [Ca²⁺][F⁻]² b) Ksp = [Ag⁺]²[SO₄²⁻]

To write the expression for the solubility product constant (Ksp) for a) Calcium fluoride (CaF2) and b) Silver sulfate (Ag2SO4), you'll need to consider the balanced chemical equations for the dissolution of these compounds in water.

a) For Calcium fluoride (CaF2):
CaF2 (s) ⇌ Ca²⁺ (aq) + 2F⁻ (aq)
The solubility product constant expression for Calcium fluoride is:
Ksp = [Ca²⁺][F⁻]²

b) For Silver sulfate (Ag2SO4):
Ag2SO4 (s) ⇌ 2Ag⁺ (aq) + SO₄²⁻ (aq)
The solubility product constant expression for Silver sulfate is:
Ksp = [Ag⁺]²[SO₄²⁻]

In these expressions, the brackets denote the molar concentrations of the ions at equilibrium, and the exponents correspond to their stoichiometric coefficients in the balanced chemical equation.

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The maximum amount of strong base that can be added to the buffer without significantly changing the pH is 0.35 mol.

What is Sodium Carbonate?

Sodium carbonate ([tex]Na_{2}[/tex][tex]CO_{3}[/tex]) is a white, odorless powder that is commonly used in various applications such as in the manufacture of glass, soaps and detergents, water softening, and as a food additive. It is an ionic compound made up of sodium cations (Na+) and carbonate anions ([tex]CO_{3}[/tex] 2-). It is also known as washing soda, soda ash, or sal soda.

Number of moles of NaH[tex]CO_{3}[/tex] = 0.35 mol

To calculate the initial pH of the buffer, we need to use the Henderson-Hasselbalch equation:

pH = pKa + log([A-]/[HA])

where pKa is the acid dissociation constant of the weak acid in the buffer (in this case, carbonic acid, [tex]H_{2}[/tex][tex]CO_{3}[/tex]), [A-] is the concentration of the conjugate base (in this case, bicarbonate ion, H[tex]CO_{3}[/tex]-), and [HA] is the concentration of the weak acid (in this case, carbonic acid, [tex]H_{2}[/tex][tex]CO_{3}[/tex]).

The pKa of carbonic acid is 6.35, and the concentrations of H[tex]CO_{3}[/tex]- and [tex]H_{2}[/tex][tex]CO_{3}[/tex] can be calculated using the initial amounts of NaH[tex]CO_{3}[/tex]  and Na2[tex]CO_{3}[/tex]and the stoichiometry of the reaction:

[H[tex]CO_{3}[/tex]-] = [NaH[tex]CO_{3}[/tex]] = 0.35 mol / (0.35 mol + 0.50 mol) = 0.411 M

[[tex]CO_{2}[/tex] = [[tex]H_{2}[/tex][tex]CO_{3}[/tex]] = [NaH[tex]CO_{3}[/tex]] - [H[tex]CO_{3}[/tex]-] = 0.35 M - 0.411 M = -0.061 M

(Note: The negative concentration of [tex]CO_{2}[/tex] is due to the fact that it is in equilibrium with dissolved carbon dioxide gas, which can escape from the solution.)

Plugging these values into the Henderson-Hasselbalch equation, we get:

pH = 6.35 + log(0.411 / (-0.061))

pH = 9.17

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The Tollens test is positive in the presence of an aldehyde because aldehydes can be converted to silver ions (Ag+) when they interact with the Tollens reagent. This reaction forms a silver mirror on the inside of the test tube, indicating the presence of an aldehyde.

The Tollens reagent is made up of silver nitrate (AgNO3) and ammonia (NH3), and the reaction involves the reduction of Ag+ ions to metallic silver (Ag) by the aldehyde. This reaction is used to distinguish aldehydes from ketones, as ketones do not react with the Tollens reagent.

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The molecule XeBr₂Cl₂, which is a compound formed by the noble gas Xenon, is polar or not.

The molecule XeBr₂Cl₂ is polar.

1. Determine the molecule's geometry. XeBr₂Cl₂ has a total of 4 atoms bonded to the central Xenon (Xe) atom. Considering the 4 bonded atoms and the lone pair of electrons on Xenon, the molecule has a trigonal bipyramidal geometry.
2. Identify the electronegativity of each atom. Bromine (Br) and Chlorine (Cl) have different electronegativities.
3. Assess the polarity of individual bonds. Due to the difference in electronegativity between Bromine and Chlorine, the Xe-Br and Xe-Cl bonds are polar.
4. Evaluate the overall polarity. Since the molecule is not symmetrical and the individual bonds are polar, XeBr₂Cl₂ is a polar molecule.

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The most abundant nonanthropogenic greenhouse gas is (A) H2O, also known as water vapor. While (B) CO2, (C) CH4, (D) O3, and (E) CCl2F2 are all greenhouse gases, water vapor is the most abundant and naturally occurring greenhouse gas in the Earth's atmosphere.

The most abundant greenhouse gas overall, water vapor differs from other greenhouse gases in that changes in its atmospheric concentrations are linked not to human activities directly, but rather to the warming that results from the other greenhouse gases we emit. Warmer air holds more water.

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The elements are the present in this mixture is the A and D. The correct option is 1.

The bright line spectrum that is produced by the four elements with the are in the below picture. The bright line spectrum is the spectrum when created is when the beam of the light passes through the sample that is analyte sample that is some of the wavelengths of the light that are absorbed through the atoms with the sample. Thus, the electrons in the atoms will get to the excited state.

Therefore, the bright line spectrum of the mixture formed by the two elements are A and the D. The option 1 is correct.

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After the spectator ions are eliminated, the species should be used when we balancing the equation for the redox reaction is H₂O (l), CO₂, Mn²⁺(aq), MnO₄⁻ (aq), C₂O₄²⁻, H⁺.

The chemical equation is as :

KMnO₄ (aq) + Na₂C₂O₄ (aq) + H₂SO₄ (aq) → MnSO₄ (aq) + K₂SO₄ (aq) + Na₂SO₄ (aq) + CO₂ (g)+ H₂O (l)

For the oxidation-reduction reactions that is the redox reaction in the acidic conditions, after the balancing the atoms and the oxidation numbers, the one will then need to add the H⁺ ions and to balance the hydrogen ions that is in the half reaction.

The spectators ions are the ions that do not participate in the chemical reactions and it will present the same that is on the both sides of the reactions.

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This question is incomplete, the complete question is :

After spectator ions are eliminated, which of the listed species should be used when balancing the equation for the following redox reaction? Select all that apply.KMnO4 (aq) + Na2C2O4 (aq) + H2SO4 (aq) → MnSO4 (aq) + K2SO4 (aq) + Na2SO4 (aq) + CO2 (g)+ H2O (l).

H₂O (l), CO₂, Mn²⁺(aq), MnO₄⁻ (aq), C₂O₄²⁻, H⁺.

This means that in one molecule of magnesium oxide, there is one magnesium cation with a charge of +2 and one oxygen anion with a charge of -2.

In a chemical formula, numbers written after the symbol of each element indicate number of atoms of that element present in one molecule of the compound. To determine the overall charge of the compound, we need to take into account the charges of the individual atoms.

In the case of magnesium oxide (MgO), magnesium is metal and tends to lose two electrons to form cation with a charge of +2 and oxygen is a nonmetal and tends to gain two electrons to form anion with charge of -2. This means that in one molecule of magnesium oxide, there is one magnesium cation with charge of +2 and one oxygen anion with a charge of -2.

If we were to write chemical formula as Mg⁺² and O₂⁻², this would imply that there are two oxygen anions, each with a charge of -2. However, in magnesium oxide, there is only one oxygen atom, and therefore, we need to write the chemical formula as MgO to correctly represent the composition of the compound.

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The Ksp for Ag2S is 6.81 × 10-63, which corresponds to option a).

To calculate the Ksp for Ag2S given its molar solubility, we need to follow these steps:

1. Write the balanced chemical equation for the dissolution of Ag2S:
Ag2S (s) ⇌ 2Ag+ (aq) + S2- (aq)

2. Use the molar solubility (1.26 × 10-16 M) to determine the concentration of each ion at equilibrium:
[Ag+] = 2 × (1.26 × 10-16 M) = 2.52 × 10-16 M
[S2-] = 1.26 × 10-16 M

3. Write the expression for the Ksp of Ag2S:
Ksp = [Ag+]^2 × [S2-]

4. Substitute the equilibrium concentrations into the Ksp expression:
Ksp = (2.52 × 10-16)^2 × (1.26 × 10-16)

5. Calculate the Ksp:
Ksp = 6.81 × 10-63

So, the Ksp for Ag2S is 6.81 × 10-63.

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Answer:

The correct answer is:

a) Saturated.

When salt is added to water until no more salt can be dissolved, it forms a saturated solution. A saturated solution is a solution in which the maximum amount of solute has been dissolved at a given temperature and pressure, and no more solute can dissolve. It is in a state of dynamic equilibrium, with solute particles constantly dissolving and precipitating at the same rate.

It is crucial to ensure that the magnesium wire is securely tied to the copper wire to avoid this error and ensure accurate results in the calculation of the molar mass of magnesium.

The common error in this experiment, where the magnesium wire breaks free from the bottom of the buret, can have a significant impact on the final calculated molar mass of magnesium.

This is because the magnesium wire not reacting completely with the acid means that the amount of magnesium consumed is not accurate, which leads to an incorrect value for the molar mass of magnesium.

When the magnesium wire breaks free, it stops reacting with the acid prematurely, resulting in a reduced amount of magnesium being consumed. This means that the calculated molar mass of magnesium will be higher than its actual value, as there is less magnesium consumed than there should be.

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Catalysts increase reaction rates by D) providing an alternate reaction mechanism with a lower activation energy.

Catalysts are materials that can quicken chemical reactions without consuming themselves. To achieve this, they offer a different reaction route with a lower activation energy, enabling more reactant molecules to obtain the required energy for the reaction to occur.

Reduced activation energy makes it simpler for reactant molecules to cross the energy barrier and create products. Activation energy is the amount of energy needed for a reaction to take place. Both the enthalpy of a reaction, which is a measure of the heat absorbed or released during a reaction, and the equilibrium constant of a reaction, which is a gauge of how far a reaction has progressed, are unaffected by catalysts.

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The kilograms of the nickel  be added to the 5.66 kg of the copper to yield the liquidus temperature of 1200 °C is 2.42 kg.

The  liquidus temperature = 1200 °C

The mass of the copper = 5.66 kg

The mass of the nickel = (mass of the copper) × (% of the nickel needed - % of nickel in the copper) / (% of nickel in the nickel - % of nickel in copper)

The mass of the nickel = (5.66 kg) × (30% - 0%) / (30% - 100%)

The mass of the nickel = (5.66 kg) × (0.3) / (-0.7)

The mass of the nickel = 2.42 kg

Thus, the mass of the nickel is 2.42 kg.

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Two-Dimensional Gel Electrophoresis (2DGE) is a gel electrophoresis method that separates proteins on the basis of their relative contents of acidic and basic residues. When a protein is at its pI (isoelectric point), it has a net charge of zero.

The primary technique for proteomics research is two-dimensional gel electrophoresis, or 2D-PAGE. It isolates a complex combination of samples by using two different protein characteristics. Proteins can be separated in the first dimension by their pI value, and in the second dimension by their relative molecular weight.  Proteins were initially visualised using ³²P or ³⁵S labelling. This is now being superseded by more sensitive approaches like SYBRO Ruby. Advances have been made at several phases of the 2D-PAGE technology, which can separate up to a staggering 10,000 proteins in just one single gel. A 2D-PAGE gel picture is recorded and analysed to determine the amount of proteins expressed in a certain tissue.

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The term chemiosmosis is associated with the Electron Transport Chain (ETC).

Chemiosmosis is a process in cellular respiration that involves the movement of ions across a selectively permeable membrane to generate ATP. It is a mechanism by which cells convert energy stored in electrochemical gradients into the energy stored in ATP molecules. During chemiosmosis, electrons flow through the electron transport chain (ETC) and establish a proton gradient across the inner mitochondrial membrane.

This gradient is then used by ATP synthase to generate ATP. The process is found in both eukaryotes and prokaryotes and is essential for the production of ATP in cells. Chemiosmosis plays a crucial role in many physiological processes, including muscle contraction, nerve impulses, and photosynthesis.

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Full Question: The term chemiosmosis is associated with which process?

The chemical reaction in which lithium hydroxide and hydrogen is an example of a single replacement reaction.

A single replacement reaction, also goes by the name "single displacement reaction" and it is a type of a reaction wherein one element in a compound is swapped with another element. For example:

AC + B → A + BC

Because of the production of a new bond in the products, single replacement reactions are often exothermic. This means that single-replacement reactions generate energy rather than consuming it (as in endothermic reactions).

   Only when the more reactive element replaces the less reactive element can single-replacement reactions occur.

The reactivity of the metals can be obtained from the table of activity series of metals.

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The geometry of the hexafluoroaluminate ion (AlF6)^-3 is octahedral. The correct answer is option a.

In this ion, an aluminum (Al) atom is surrounded by six fluoride (F) atoms. The octahedral geometry is a result of the aluminum atom's coordination with six fluoride ions, which distribute themselves symmetrically around the aluminum atom.

In an octahedral arrangement, the central atom forms six bonding pairs with its surrounding ligands, creating six bond angles of 90 degrees between adjacent fluoride atoms. The octahedral shape maximizes the distance between the fluoride ions, minimizing electron repulsion and stabilizing the overall structure of the ion.

This arrangement is distinct from other geometries such as tetrahedral (option b), trigonal bipyramidal (option c), and hexagonal (option d), which involve different numbers of bond pairs and bond angles. The octahedral geometry is a common structure for metal coordination complexes and provides insights into the electronic properties and reactivity of the hexafluoroaluminate ion.

Therefore, option a is correct.

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The statement about mentioned reaction saying the change in entropy is negative is true.

Entropy refers to the disorder or randomness of the system. The concept is related to thermodynamics and finds applications in understanding the properties, existence and movement of gases.

The change in number of moles of reaction can help in finding the change in entropy. The mentioned reaction proceeds with decrease in number of moles, thus entropy is negative. As we see, the Left Hand Side have total of three moles of reactants while products are only two moles.

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The correct answer is (b) scrubbing.

The process of removing sulfur from gases emitted from power plants that burn coal is called scrubbing.

The process of removing sulfur from gases emitted from power plants that burn coal is called ""scrubbing."" Coal is a fossil fuel that contains sulfur compounds, which, when burned, can produce sulfur dioxide (SO2) emissions. These emissions can have negative environmental impacts, such as contributing to acid rain and smog formation.

Scrubbing is a method used to remove these sulfur compounds from the exhaust gases produced by burning coal. The process involves passing the exhaust gases through a chemical solution that reacts with the sulfur compounds, converting them into a solid or liquid form that can be removed from the gas stream.

The most common type of scrubbing used in coal-fired power plants is called ""wet scrubbing."" In wet scrubbing, the exhaust gases are passed through a liquid solution, typically made up of water and a chemical reagent such as limestone or lime. The sulfur compounds react with the reagent, forming solid or liquid byproducts that can be removed from the gas stream.

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Given the following reactions

N₂ (g) + O₂ (g) → 2NO (g) ΔH = +180.7 kJ

2NO (g) + O₂ (g) → 2NO₂ (g) ΔH = -113.1 kJ

the enthalpy of reaction for 4NO (g) → 2NO₂ (g) + N₂ (g) is _135.2_ kJ.

Multiplying the first equation by 2 to match the number of moles of NO in the desired equation, we get:

2N₂(g) + 2O₂(g) → 4NO(g) ΔH = +361.4 kJ

Adding this to twice the second equation, we get:

2N₂(g) + 4O₂(g) → 2NO₂(g) + 4NO(g) ΔH = +135.2 kJ

Finally, cancelling out the common intermediate 2NO from both sides of the equation, we get:

4NO(g) → 2NO₂(g) + N₂(g) ΔH = -135.2 kJ

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