2. calculate the temperature in oc when 2.50 moles of argon occupy 25.0 l at 1.20 atm. write the ideal gas equation and give the units for each term.

Answer:

C) the law of conservation of matter

Explanation:

The law of conservation of matter, also known as the law of conservation of mass, states that matter cannot be created or destroyed in a chemical reaction. This means that the total mass of the reactants in a chemical reaction must be equal to the total mass of the products.

In the context of recycling, this law means that the materials used to make a product can be reused or transformed into new products, rather than being discarded as waste. When materials are recycled, they are not destroyed or eliminated, but rather they are converted into new forms or combined with other materials to create something new. By recycling materials, we are able to reduce the amount of waste that goes into landfills or is incinerated, and we can also conserve natural resources by using fewer raw materials to make new products. Overall, the law of conservation of matter provides a scientific basis for the practice of recycling, and highlights the importance of sustainable resource use and waste reduction.

For a weak acid dissociating in water the rates of the forward and reverse reactions will be equal. Option c is the correct choice.

In the context of weak acid dissociation, equilibrium refers to the point where the rate of the forward reaction, which is the dissociation of the acid into its ions, is equal to the rate of the reverse reaction, which is the recombination of the ions to form the original acid molecule.

At equilibrium, there is no net change in the concentration of the acid or its ions. The position of equilibrium, which is determined by the acid's equilibrium constant, depends on the strength of the acid and the conditions of the reaction. Understanding the behavior of weak acids at equilibrium is important in various fields such as biochemistry, environmental science, and industrial processes.

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A model can be used to visually represent the chemical reaction occurring at station 1, which can help to understand the reaction mechanism and the role of each reactant in the reaction.

A chemical reaction is a process in which one or more substances (known as reactants) are transformed into new substances (known as products) through the breaking and formation of chemical bonds.

A model can be used to represent a chemical reaction by showing the reactants and products involved and the changes that occur during the reaction. Specifically, for station 1, a model can illustrate the chemical reaction by depicting the reactants (such as hydrogen and oxygen) and the products (such as water) involved in the process.

One way to create a model of this chemical reaction is through a chemical equation, which uses chemical formulas to represent the reactants and products and shows the chemical changes that occur during the reaction. The chemical equation for the reaction at station 1 is:

2 H2 + O2 → 2 H2O

This equation shows that two molecules of hydrogen (H2) react with one molecule of oxygen (O2) to form two molecules of water (H2O). The coefficients in front of each molecule indicate the number of molecules of each substance involved in the reaction.

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Complete question:

Can you explain how a model can be used to illustrate the chemical reaction at station 1?

It is likely that they would choose the ion exchange system as the most cost-effective option for water purification, provided it meets their specific water quality requirements.

Based on the student question, it appears that the city council is considering two water purification systems, reverse osmosis and ion exchange, with cost being the primary criterion for their decision.

In this scenario, the most likely result of the debate would be the selection of the water purification system with the lowest overall cost, taking into account both initial investment and ongoing operational expenses. To determine this, the city council would need to conduct a thorough cost analysis of each system.

Reverse osmosis is a process that uses pressure to force water through a semi-permeable membrane, removing contaminants and impurities. It is an effective method for purifying water, but the process can be energy-intensive and may require significant infrastructure investments, such as high-pressure pumps and specialized membranes. Additionally, ongoing costs can be high due to membrane replacement and energy usage.

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As a lead-acid battery is discharged, the pH of the solution in the battery decreases.Additionally, the voltage of the cell decreases as the battery discharges.

As a lead-acid battery is discharged, the pH of the solution in the battery decreases. This is because the overall reaction of the battery results in the production of hydrogen ions (H+) at the negative electrode and the consumption of hydrogen ions at the positive electrode. The accumulation of H+ ions at the negative electrode causes the pH to decrease.

Additionally, the voltage of the cell decreases as the battery discharges. This is because the availability of reactants decreases as the reaction progresses, resulting in a decrease in the driving force for the reaction. The voltage of a lead-acid battery is directly proportional to the concentration of sulfuric acid (H2SO4) in the electrolyte. As the battery discharges, the concentration of sulfuric acid decreases, leading to a decrease in voltage.
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The combination [tex]H_2CO_3(aq)[/tex]  and [tex]KHCO_3(aq)[/tex]  is a buffer system.

A buffer system is a solution that can resist changes in pH when small amounts of an acid or a base are added to it. A buffer is usually composed of a weak acid and its conjugate base or a weak base and its conjugate acid. A buffer system works by absorbing any added acid or base with its weak acid or weak base components.

[tex]H_2CO_3(aq)[/tex] and [tex]KHCO_3(aq)[/tex]  is a buffer system because [tex]H2CO_3[/tex] is a weak acid, and [tex]KHCO_3[/tex] is its conjugate base.

Therefore, this combination of [tex]H_2CO_3(aq)[/tex]  and [tex]KHCO_3(aq)[/tex] is capable of acting as a buffer system.

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Atomic nuclei's unstable arrangement leads to radioactivity. Atoms with unstable nuclei can spontaneously go through a process known as radioactive decay where they release electromagnetic radiation and/or particles to attain a more stable configuration.

Radiation is the general term used to describe the particles and energy released during radioactive disintegration.

Alpha, beta, and gamma decay are the three kinds of radioactive decay. The center releases an alpha particle during alpha decay, which is made up of two protons and two neutrons.

The atomic number is decreased by two, and the mass number is decreased by four. The nucleus releases a beta particle, either an electron or a positron, during beta decay. The amount of protons and/or neutrons in the nucleus is altered as a result.

Radioactivity can be created intentionally, as in the case of nuclear reactions in nuclear power plants and nuclear weapons, or it can occur naturally, as in the case of radioactive isotopes like uranium and thorium found in the earth's crust.

Depending on the radiation type, dose, and length of exposure, the effects of radiation exposure can vary from no harm to severe health effects like radiation sickness, cancer, and genetic damage.

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The volume, in l, of 10.0 m hcl needed to make 2.00 l of 2.00 m hcl solution by dilution with water is 0.400 L. The correct answer is option b (0.400 L).

To make a 2.00 M HCl solution by diluting 10.0 M HCl, we can use the formula:

M1V1 = M2V2 ,where M1 is the initial concentration (10.0 M), V1 is the initial volume (unknown), M2 is the final concentration (2.00 M), and V2 is the final volume (2.00 L).

Rearranging this equation to solve for V1, we get:

V1 = (M2V2) / M1

Plugging in the values, we get:

V1 = (2.00 M x 2.00 L) / 10.0 M

V1 = 0.400 L

Therefore, the volume of 10.0 M HCl needed to make 2.00 L of 2.00 M HCl solution by dilution with water is 0.400 L.

Dilution is defined as the process of adding more solvent to a solution. When diluting a solution, the concentration of the solute is reduced. It's important to note that when diluting a solution, the number of moles of the solute remains the same.

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Answer:

What is the question?

Explanation:

Answer: the one thats not there because you didnt put any pictures

Answer:

The two such half field atomic orbitals compbine to from a molecular orbital which contains both these electrons. But helium (Z=2) has already a filled orbital (1s2). Therefore, the atomic orbitals of the helium atoms donot combine. Thus, a molecule of H2 exists while that of He2 does not.

The correct reagent needed to convert [tex]CH3CH2COOCH2CH2CH3 to CH3CH2CHO[/tex] is c. LiAlH4.

Reagent refers to the substance or compounds which help in detecting or measuring some other substances by taking part in chemical reactions.

A reagent is often used to detect or determine the presence of a substance, to cause a reaction, or to serve as a standard for comparison.

LiAlH4 is a strong reducing agent that is commonly used for chemical reductions. Lithium aluminum hydride (LiAlH4) is a reducing agent used in organic chemistry.

It is mainly used for the reduction of esters, carboxylic acids, and amides to alcohols, aldehydes, and amines, respectively. Therefore, LiAlH4 is required to convert [tex]CH3CH2COOCH2CH2CH3 to CH3CH2CHO[/tex].

The reaction is as follows:[tex]CH3CH2COOCH2CH2CH3 + 4[H] → CH3CH2CHO + CH3CH2CH2OH + HCOOCH2CH2CH3[/tex]

Thus, the correct answer is option c.

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We can predict that magnesium would not react with KCl solution.

Here are some examples of balanced chemical equations for reactions that might have occurred:

a) Zinc + Hydrochloric acid → Zinc chloride + Hydrogen gas

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

b) Magnesium + Nitric acid → Magnesium nitrate + Hydrogen gas

Mg(s) + 2HNO3(aq) → Mg(NO3)2(aq) + H2(g)

c) Copper + Silver nitrate → Copper nitrate + Silver

Cu(s) + 2AgNO3(aq) → Cu(NO3)2(aq) + 2Ag(s)

To list the metals in order of increasing activity based on experimental data, we need to observe and compare their reactivity towards a certain reaction or set of reactions. For example, we can immerse different metals in the same solution and observe which ones react and which ones don't, or we can compare the rate or extent of their reactions.

Assuming that we have data from an experiment involving different metals and a solution or compound, we can rank the metals in order of increasing activity as follows:

copper

Zinc

Magnesium

The order is based on the observation that copper did not react with the solution, while zinc and magnesium did. Zinc reacted faster and more vigorously than magnesium, indicating that it is more active.

Based on the ranking of metals in question 2, we can predict that zinc would react with KCl solution, while magnesium would not. Zinc is more active than magnesium, so it can displace magnesium from its compounds. KCl is a soluble salt, so we can write the balanced chemical equation for the reaction between zinc and KCl as:

Zn(s) + 2KCl(aq) → ZnCl2(aq) + 2K(s)

This reaction releases metallic zinc and forms zinc chloride, while the potassium ions in KCl remain in solution. Magnesium, on the other hand, is less active than zinc, so it cannot displace zinc from its compounds. Therefore, we can predict that magnesium would not react with KCl solution.

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The correct option is A, the pH value of 1.2 would correspond to the highest concentration of hydronium ions.

pH is a measure of the acidity or basicity (alkalinity) of a solution. It is defined as the negative logarithm of the hydrogen ion concentration in a solution. The pH scale ranges from 0 to 14, with 7 being neutral. Solutions with a pH below 7 are considered acidic, while solutions with a pH above 7 are considered basic or alkaline.

The pH value of a solution affects the chemical and biological processes that occur within it. For example, enzymes, which are proteins that catalyze chemical reactions in living organisms, have an optimal pH range in which they function best. Changes in pH can also affect the solubility and stability of drugs and other chemicals. Measuring pH is important in many fields, including chemistry, biology, medicine, and environmental science. Common methods for measuring pH include pH meters and litmus paper

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If the initial concentrations of Pb2+ and Cu2+ are 3.0 M and 0.5 M, respectively, the voltage will decrease.

However,let's consider the most common type of reaction, which is a redox reaction.A redox reaction occurs when electrons are transferred between reactants. Electrons are gained by the oxidizing agent, whereas electrons are lost by the reducing agent. A galvanic cell uses a redox reaction to create electrical energy through the transfer of electrons from a reducing agent to an oxidizing agent.As a result, the direction of the electron flow establishes the voltage of the galvanic cell. So, the voltage is directly proportional to the strength of the reducing agent and inversely proportional to the strength of the oxidizing agent. As a result, the greater the difference between the two half-reactions' standard electrode potentials, the greater the voltage.

The Nernst equation is used to calculate the voltage of a galvanic cell. The equation is as follows: E = E° - (RT/nF) ln(Q)Where E is the voltage of the cell,E° is the standard voltage of the cell,R is the universal gas constant,T is the temperature in Kelvin,n is the number of moles of electrons transferred,F is Faraday's constant,Q is the reaction quotient.

For a redox reaction, the cell voltage may be calculated using the following formula: E°cell = E°red,cathode - E°red,anode = E°red,oxidized - E°red,reducedIn the absence of reaction specifics, it is impossible to determine whether the voltage will increase or decrease. The initial concentrations of Pb2+ and Cu2+ are irrelevant because the reaction's enthalpy, entropy, and activation energy are critical in determining the voltage of a galvanic cell.

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The following elements are in the noble gas column of the periodic table of elements; helium, neon, argon, krypton, xenon, and radon.

Noble gases are a group of non-reactive chemical elements on the periodic table. Noble gases are also known as inert gases since they are inert, monatomic gases under normal conditions in their standard states. Noble gases have a completely filled outermost shell, which is why they are inert, as no other electrons are required to complete them

.The following elements are in the noble gas column of the periodic table of elements:Helium,Neon,Argon,Krypton,Xenon&Radon. The elements in the noble gas column have their valence electron configuration completed; hence, they don't require or donate electrons from other atoms to complete their outer shell. Therefore, these elements do not have the ability to bond with other elements, making them inert.

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True, In the given redox reaction, Cu(s) + 2Ag⁺(aq) → Cu²⁺(aq) + 2Ag(s), copper (Cu) is undergoing oxidation.

1. Identify the oxidation states of each element in the reactants and products:
- Cu(s): 0 (elemental state)
- Ag⁺(aq): +1
- Cu²⁺(aq): +2
- Ag(s): 0 (elemental state)
2. Determine the change in oxidation states for each element involved in the reaction:
- Cu: from 0 to +2 (increase in oxidation state)
- Ag: from +1 to 0 (decrease in oxidation state)
3. Analyze the changes in oxidation states:
- An increase in oxidation state indicates that the element has lost electrons and has undergone oxidation. In this case, copper (Cu) has an increase in its oxidation state from 0 to +2, which means it has lost 2 electrons (2e⁻) during the reaction.
- A decrease in oxidation state indicates that the element has gained electrons and has undergone reduction. In this case, silver (Ag) has a decrease in its oxidation state from +1 to 0, which means it has gained 1 electron (1e⁻) during the reaction.
4. Confirm the redox process:
- Oxidation: Cu(s) → Cu²⁺(aq) + 2e⁻
- Reduction: 2Ag⁺(aq) + 2e⁻ → 2Ag(s)

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The Hoffmann product is the elimination product with the least substitution. Option A is correct.

It is obtained when the elimination reaction occurs via a mechanism that involves a cyclic transition state, leading to an anti-periplanar geometry of the leaving groups. This results in the formation of the least substituted alkene as the major product.

The Hoffmann product is often observed when the leaving group is bulky and cannot adopt a conformation that favors the formation of the more substituted alkene.

An elimination product is a product formed by the elimination of a molecule, often a leaving group, from a larger molecule. Elimination reactions are common in organic chemistry and often involve the removal of a proton and a leaving group from an organic molecule to form a double bond between adjacent carbon atoms.

Hence, A. is the correct option.

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--The given question is incomplete, the complete question is

"The Hoffman product is: select answer from the options below A) the elimination product with the least substitution. B) the elimination product with the highest substitution. C) never the major product of an elimination. D) the elimination product with a bridgehead double bond."--

The partial pressure of each gas in the mixture is  294 mm and 455 mm respectively.

[tex]P_{total}[/tex] = 749 mm[tex]H_{g}[/tex]

The Partial pressure of a gas is equals to the mole fraction of that gas x total pressure according to the Raoult's law.

moles Xenon = 16.8 g x 1 mole Xenon / 131 g = 0.128 moles Xenon

moles Nitrogen = 5.54 g N2 x 1 mole N2 / 28 g = 0.198 moles N2

Total moles of gas = 0.128 moles x 0.198 moles = 0.326 moles

Mole fraction of the Xenon = 0.128/0.326 = 0.393

Mole fraction Nitrogen = 0.198/0.326 = 0.607

Partial pressure of Xenon = 0.393 x 749 mm Hg = 294 mm [tex]H_{g}[/tex]

Partial pressure of Nitrogen = 0.607 x 749 mm Hg = 455 mm [tex]H_{g}[/tex]

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The correct question is,

A mixture of xenon and nitrogen gases, at a total pressure of 749 mm Hg, contains 16.8 grams of xenon and 5.54 grams of nitrogen. What is the partial pressure of each gas in the mixture?

Answer:  The purpose of phenolphthalein indicator is to show pink color if the liquid in the flask is titration fully.

Explanation:

The purpose of adding phenolphthalein to your Erlenmeyer flask prior to starting a titration is to serve as an indicator for the endpoint of the titration.

What is titration?

Titration is a laboratory technique used to determine the concentration of a solution of a known volume by reacting it with a solution of known concentration or strength. A titration is a controlled chemical reaction that is conducted by slowly adding one solution to another until the chemical reaction is complete.

Phenolphthalein- Phenolphthalein is a commonly used indicator in acid-base titrations. The color of phenolphthalein changes depending on the pH of the solution being titrated. Phenolphthalein is pink in the presence of a base and colorless in the presence of an acid.

The purpose of adding phenolphthalein to the Erlenmeyer flask before starting a titration is to serve as an indicator for the endpoint of the titration. The endpoint of a titration is the point at which the reaction is complete.

When the reaction is complete, the color of the solution will change from pink to colorless, indicating that the solution has reached the endpoint of the titration.

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The concentrations of Pb₂⁺ and Cr₂⁺ at equilibrium are 0 M and 0.100 M, respectively. The concentration of Cr₃⁺ at equilibrium is 0.200 M.

To determine the concentrations of the different species at equilibrium, we need to write the balanced chemical equation for the reaction between lead metal and chromium(III) ion:

Pb(s) + 2Cr₃⁺(aq) → Pb₂⁺(aq) + 2Cr₂⁺(aq)

We also need to know the initial concentration of chromium(III) ion, which is given as 0.100 M.

Since lead metal is a solid, it does not have a concentration. Instead, its presence affects the equilibrium concentrations of the other species. We assume that the reaction goes to completion, which means that all the chromium(III) ion will react with the lead metal.

At equilibrium, we can use an ICE table to determine the concentrations of the different species:

Initial:              0.100 M         0 M               0 M

Change:        -0.100 M      +0.100 M     +0.200 M

Equilibrium:     0 M             0.100 M        0.200 M

At equilibrium, the concentrations of Pb₂⁺ and Cr₂⁺ are 0 M and 0.100 M, respectively. At equilibrium, the concentration of Cr₃⁺ is 0.200 M.

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The density of the cube with sides of 2cm and a mass of 100g is 12.5 g/cm³.

How to calculate the density of the cube?

The density of the object is defined as its mass-per-unit volume. In this case, we know the mass of the cube and we can calculate its volume as the cube of the length of its sides.

The volume of the cube is:

V = (2 cm)³ = 8 cm³

Next, The density can be calculated using the following formula:

Density = mass / volume

Density = 100 g / 8 cm³ = 12.5 g/cm³

Therefore, the density of the cube is 12.5 g/cm³.

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The molarity of the LiOH solution is 0.075 M.

To calculate the molarity of the LiOH solution, we need to use the equation for neutralization reactions, which states that the number of moles of acid (HNO₃) is equal to the number of moles of base (LiOH). We can calculate the number of moles of HNO₃ from the volume and concentration given:

Moles HNO₃ = concentration x volume = 0.10 M x 28.50 mL = 2.85 x 10⁻³ moles

Since the reaction is 1:1, this also represents the number of moles of LiOH used in the reaction. We can now calculate the molarity of the LiOH solution using the volume of LiOH used:

Moles LiOH = 2.85 x 10⁻³ moles

Volume LiOH = 18.80 mL = 0.01880 L

Molarity LiOH = moles LiOH / volume LiOH

                       = 2.85 x 10⁻³ moles / 0.01880 L

                       = 0.075 M

Therefore, the LiOH solution has a molarity of 0.075 M..

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The T value of 2-propanol is higher than acetone due to the presence of hydrogen bonding in 2-propanol, which results from its hydroxyl group. This stronger intermolecular force requires more energy to break, leading to a higher boiling point.

The boiling points of acetone and 2-propanol are 56.05°C and 82.6°C, respectively. The T value of 2-propanol is higher than acetone. This difference is caused by the difference in their molecular structures and intermolecular forces.

Acetone is a ketone (CH3COCH3), while 2-propanol is alcohol (CH3CH(OH)CH3). Although both compounds have similar mass values, 2-propanol contains a hydroxyl group (-OH) in its structure, which allows it to form hydrogen bonds with neighboring molecules. Hydrogen bonding is a strong intermolecular force that requires more energy to break and thus, raises the boiling point of the compound.

In contrast, acetone only has a carbonyl group (C=O), and it cannot form hydrogen bonds with itself. It experiences dipole-dipole interactions and London dispersion forces, both of which are weaker intermolecular forces compared to hydrogen bonding.

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Gas chromatography analysis will be used to determine the amount of diene in the eucalyptus oil, and moisture-free conditions must be maintained throughout the entire reaction. Option A and B are thus correct.

In this method, a sample is fed into the gas chromatograph after being combined with a solvent. The sample is transformed from a liquid to a gas by vaporisation. The sample is carried through the column by an inert carrier gas that is also flowing through it.

Here are the correct statements about lab exercise 5:

False: Unreacted maleic anhydride can be separated from the adduct by vacuum filtration.

True: It is necessary to maintain dry conditions during the process.

True: Gas chromatogram analysis will be used to assess how much diene is present in the eucalyptus oil.

False: The melting point of the diene will be used to identify it.

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Correct question:

Which of the following statements are true/false about lab exercise 5?

A. the amount of diene in the eucalyptus oil will be determined using gas  chromatogram analysis

B. unreacted maleic anhydride can be separated from the adduct by vacuum filtration

C. The diene will be identified by its melting point.

D. moisture-free conditions must be kept at all times during the reaction

The flask contains approximately  1.07 x 10^23 gaseous molecules at STP.

To calculate the number of gaseous molecules in the flask, we need to use the ideal gas law, which relates the number of molecules of a gas to its pressure, volume, and temperature. The ideal gas law is expressed as:

PV = nRT

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

At standard temperature and pressure (STP), the pressure is 1 atm and the temperature is 273.15 K. The gas constant R is 0.08206 L atm/mol K.

So, we can calculate the number of moles of gas in the flask as:

n = PV/RT = (1 atm)(4.50 L)/(0.08206 L atm/mol K)(273.15 K) = 0.178 mol

The number of molecules in the flask can then be calculated by multiplying the number of moles by Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol:

Number of molecules = n x Avogadro's number = 0.178 mol x 6.022 x 10^23 molecules/mol = 1.07 x 10^23 molecules.

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The best reason a writer would use an unreliable narrator is B. Using an unreliable narrator can create excitement and tension.

An unreliable narrator is a literary technique where the narrator's credibility is compromised due to their lack of honesty, mental state, or understanding of events. Using an unreliable narrator can create suspense and tension in a story since the reader is unsure of what is true or false.

In contrast, using a reliable narrator may not create as much tension or intrigue since the reader is more likely to trust the narrator's account of events. However, it is important to note that using an unreliable narrator can also lead to frustration for the reader if the author does not handle the technique effectively.

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The structural difference between eugenol and acetyleugenol is that eugenol has a hydroxyl group (-OH) at the para position of the benzene ring, while acetyleugenol has an acetyl group (-COCH₃) at the same position. This difference in functional groups allows for their separation by acid-base extraction.

Eugenol and acetyleugenol are initially present in the clove oil. In the first step, the clove oil is mixed with aqueous sodium hydroxide (NaOH) and heated to form a mixture. During this step, eugenol and acetyleugenol dissolve in the aqueous phase. Then, the mixture is cooled, and the aqueous phase containing eugenol and acetyleugenol is separated from the organic phase.

In the second step, hydrochloric acid (HCl) is added to the aqueous phase to lower the pH and cause eugenol to separate out as a solid. Acetyleugenol remains dissolved in the aqueous phase. Finally, eugenol is filtered and recovered as a solid, while acetyleugenol is left behind in the aqueous phase.

The reaction of eugenol with NaOH results in the deprotonation of the hydroxyl group to form the corresponding phenoxide ion. The product obtained is sodium eugenolate, which can further react with other reagents to form various derivatives. The reaction can be represented as; Eugenol + NaOH → Sodium eugenolate + H₂O

where sodium eugenolate is the product obtained.

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The change in energy for an electron within a hydrogen atom that undergoes a transition from an initial energy level with principal quantum number n₁ to a final energy level with principal quantum number n₂ is [tex]2.179872 * 10^{-18} J[/tex].

The change in energy for an electron within a hydrogen atom that undergoes a transition from an initial energy level with principal quantum number n₁ to a final energy level with principal quantum number n₂ is given by the formula:

[tex]\Delta E = -Rhc[(\frac{1}{n_2^2}) - (\frac{1}{n_1^2})][/tex]

Where ΔE is the change in energy, R is the Rydberg constant [tex](1.0973731568508 * 10^7 m^{-1})[/tex], h is the Planck constant [tex](6.62607015 * 10^{-34} J*s)[/tex], and c is the speed of light [tex](2.99792458 * 10^8 m/s)[/tex].

Plugging in the values for n₁ and n₂, we can calculate the change in energy:

[tex]\Delta E = -Rhc[\frac{1}{4} - \frac{1}{9} ][/tex]

[tex]\Delta E = -Rhc[(-\frac{5}{36} )][/tex]

[tex]\Delta E = (\frac{5}{36} )Rhc[/tex]

[tex]\Delta E = (\frac{5}{36})*(1.0973731568508 * 10^7 )*(6.62607015 * 10^{-34})*(2.99792458 * 10^8)[/tex]

[tex]\Delta E = 2.179872 * 10^{-18}[/tex] J

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