A 1.000 g sample of decane, C10H22, is ignited in a bomb calorimeter. The temperature of the calorimeter increases from 20.0 to 78.8 C. If the heat capacity of the calorimeter is 810.1 J/ C, determine delta E for the combustion of decane.


This is the question, and I solved the q (decane) but don't know how to solve the delta E

The enthalpy change for the given reaction is -802.3 kJ/mol, indicating that the reaction is exothermic, i.e., it releases energy in the form of heat.

To find the enthalpy change for the given reaction, we need to use the standard enthalpy of formation values for the compounds involved.

The balanced chemical equation for the reaction is:

CH4(g) + 2O2(g) → CO2(g) + 2H2O(g)

The enthalpy change (ΔH) for the reaction can be calculated as follows:

ΔH = ΣnΔHf(products) - ΣnΔHf(reactants)

where n is the number of moles of each compound and ΔHf is the standard enthalpy of formation of the compound.

Using the standard enthalpy of formation values from a reference table, we can calculate the enthalpy change as follows:

ΔH = [ΔHf(CO2) + 2ΔHf(H2O(g))] - [ΔHf(CH4) + 2ΔHf(O2(g))]

ΔH = [(−393.5 kJ/mol) + 2(−241.8 kJ/mol)] - [−74.8 kJ/mol + 2(0 kJ/mol)]

ΔH = −802.3 kJ/mol

Therefore, the enthalpy change for the given reaction is -802.3 kJ/mol, indicating that the reaction is exothermic, i.e., it releases energy in the form of heat.

What is enthalpy change?

Enthalpy change is the amount of heat released or absorbed in a chemical reaction at a constant pressure. It is a measure of the difference in enthalpy (the heat energy of a system at constant pressure) between the products and the reactants of a chemical reaction.

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The energy of a photon emitted when an electron in a hydrogen atom transitions from the third to the first energy state can be calculated using the Rydberg formula. For the given transition, the energy equates to approximately 1.63 x 10^-18 Joules.

In quantum physics, the energy of a photon emitted when an electron moves from one energy level to another in a hydrogen atom can be calculated using the Rydberg formula. The formula is E = R_H *(1/ni^2 - 1/nf^2), where R_H is the Rydberg constant for hydrogen (approximately 2.18 x 10^-18 Joules), ni is the initial energy level (3 in this case), and nf is the final energy level (1 in this case).

Plugging these into the equation, we get E = 2.18 x 10^-18 Joules *(1/3^2 - 1/1^2). Then, we find that the energy of the photon is about 1.63 x 10^-18 Joules. This energy corresponds to the energy difference between the two energy levels.

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The energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from n=3 to n=1 can be calculated using the Rydberg formula for hydrogen and the formula for the energy of a photon.

The energy of a photon emitted during an electron transition in a hydrogen atom can be calculated using the formula for the energy of a photon: E = hf, where 'E' is energy, 'h' is Planck's constant, and 'f' is frequency. Moreover, when an electron in a hydrogen atom undergoes a transition from n=3 to n=1, the energy difference between these two energy levels can be calculated using the Rydberg formula for hydrogen: ΔE = RH (1/n1² - 1/n2²), where 'RH' is the Rydberg constant for hydrogen, 'n1' and 'n2' are the initial and final energy levels respectively. By substituting the values, we get ΔE = RH (1/1² - 1/3²). So, this is the energy of the emitted photon when an electron undergoes a transition from n=3 to n=1.

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These substances C6H1203 don't already exist in their empirical formula.

The empirical formula is CH for both C2H2 and C2H6, as it represents the simplest whole number ratio of the various atoms in a molecule. The compound's molar mass is 314 g/mol, and the empirical formula mass is (2 X 12) + 1 + 80 = 105g. Hence, C6H3Br3 is the molecular formula.

Glucose has the chemical formula C6H12O6 = 6 x CH2O c.The molecular weight of glucose is 180 g/mol.. The empirical and molecular formulas are identical because it equals 6 x 30 g/mol.

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The detail from the passage that could be used to support the idea that people need to conserve mineral resources is: B. "the resources are steadily and forever diminishing."

This detail indicates that mineral resources are finite and will eventually be depleted if they are not conserved. It implies the need for people to use mineral resources more efficiently and find ways to conserve them for future generations.

What is mineral?

A mineral is a naturally occurring inorganic solid substance with a specific chemical composition and a crystalline structure. Minerals are formed through geological processes and are typically found in rocks, ores, and mineral deposits in the earth's crust. They have a wide range of physical and chemical properties and can be identified by their characteristic properties. Examples of common minerals include quartz, feldspar, calcite, and mica.

What is diminishing?

Diminishing refers to the process of becoming smaller, weaker, or less in quantity or importance. It is a gradual decrease in size, quantity, or intensity over time. For example, the diminishing population of a species indicates that the number of individuals in the population is decreasing over time, whereas diminishing natural resources indicate that the amount of those resources is gradually decreasing due to depletion.

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Answer: The amount of heat absorbed for the reaction of 25 mL of 1.0 M H₂SO4 and 50 mL of 1.0 M NaOH, resulting in a temperature increase from 25°C to 33.9°C, is 10.14 kJ.

Explanation:

5.0 moles of calcium will produce 5.0 moles of calcium carbonate.

Ca + CO2 → CaCO3

Therefore, for every 1 mole of calcium, 1 mole of calcium carbonate will be produced.

Given: 5.0 moles of calcium

Therefore, 5.0 moles of calcium carbonate will be produced.

The reaction of calcium and carbon dioxide produces calcium carbonate. For every 1 mole of calcium, 1 mole of calcium carbonate will be produced. In this case, 5.0 moles of calcium will result in the production of 5.0 moles of calcium carbonate.

This reaction is used in a variety of applications, such as the production of cement, lime, and mortar. Calcium carbonate is also used in the production of medicines and supplements, as well as in the food industry to increase calcium levels in foods. Calcium carbonate is also used in water treatment to remove heavy metals and other contaminants. In conclusion, 5.0 moles of calcium will produce 5.0 moles of calcium carbonate.

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Metals do not hold energy because they can conduct or store energy in various forms, means the electrical or kinetic energy. Different metals have different conductivity and storage capacity for different forms of energy.

Electric energy is a form of energy that results from the flow of electric charge through a conductor. It is used to power many devices and systems, from home appliances to industrial machinery.

Electric energy is measured in units of joules or kilowatt-hours.This is the example of electric energy.

Kinetic energy is an object possesses due to its motion. It is dependent on the mass and velocity of the object and is expressed as 1/2 mv^2, where m is the mass of the object and v is its velocity. Kinetic energy is a scalar quantity and is measured in joules.This is the fine example of kinetic energy.

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Metals can hold different amounts of energy depending on the specific metal and the form of energy like thermal energy, electrical energy and mechanical energy.

1. Thermal energy: Metals are good conductors of heat, so they can absorb and hold a significant amount of thermal energy. The specific amount of thermal energy that a metal can hold depends on factors such as its specific heat capacity and mass.

2. Electrical energy: Metals are also good conductors of electricity, so they can hold and transport electrical energy. The amount of electrical energy that a metal can hold depends on factors such as its conductivity and the amount of current flowing through it.

3. Mechanical energy: Metals can also store mechanical energy in the form of elastic or plastic deformation. The amount of mechanical that a metal can hold depends on factors such as its elasticity and strength.

In the context of electricity and physics, a conductor is a material or substance that allows the flow of electrical current or heat through it. Conductors are typically materials with low electrical resistance or high thermal conductivity, or both.

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Answer:  2.536 M

Explanation: To calculate the molarity of NaOH in the solution, we need to first calculate the number of moles of NaOH present in the solution.

The formula for calculating the number of moles is:

moles = mass / molar mass

The molar mass of NaOH is 40 g/mol (23 g/mol for Na + 16 g/mol for O + 1 g/mol for H). Therefore, the number of moles of NaOH present in the solution is:

moles of NaOH = 36.5 g / 40 g/mol = 0.9125 mol

The volume of the solution is 360 mL, which is equivalent to 0.360 L. Therefore, the molarity of the NaOH solution is:

Molarity = moles / volume = 0.9125 mol / 0.360 L = 2.536 M

Therefore, the molarity of the NaOH solution is 2.536 M.

80 mL of 0.25 M Pb(NO₃)₂ solution are needed to react with 0.40 L of 0.10 M NaCl solution according to the given reaction.

Double displacement reactions, also known as double replacement reactions or metathesis reactions, are chemical reactions in which two ionic compounds react with each other and exchange ions to form two new compounds.

First, we need to determine the limiting reagent in the reaction between NaCl and Pb(NO₃)₂ . The balanced equation shows that the mole ratio of NaCl to Pb(NO₃)₂ is 2:1, so we can calculate the number of moles of each reactant:

moles NaCl = 0.10 M x 0.40 L = 0.04 moles

moles Pb(NO₃)₂  = 0.25 M x V

where V is the volume of Pb(NO₃)₂  solution needed in litres.

To react completely with the NaCl, we need 2 moles of Pb(NO₃)₂  for every 1 mole of NaCl. So, we can set up an equation to solve for V:

0.04 moles NaCl / 2 x (1 molePb(NO₃)₂  / 1 mole NaCl) = 0.25 M x V

Simplifying, we get:

V = (0.04 / 2) / 0.25 = 0.08 L = 80 mL

Therefore, 80 mL of 0.25 M Pb(NO₃)₂ solution are needed to react with 0.40 L of 0.10 M NaCl solution

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Answer:

make me brainalist

Explanation:

The core of the transformer works to direct the path of the magnetic field between the primary and secondary coils to prevent wasted energy. Once the magnetic field reaches the secondary coil, it forces the electrons within it to move, creating an electric current via electromotive force (EMF).

Answer:

centrifugation

Explanation:

Centrufugal force is used to separate the components of blood red blood cells,platelets and plasma from each other,The result is that particles with different densities precipitate in layers

The order in which the ions would be precipitated is; Carbonate > Bromide > Iodide > Oxalate

Precipitation of ions refers to the process by which two aqueous solutions containing dissolved ionic compounds are mixed, resulting in the formation of an insoluble ionic compound that falls out of solution as a solid precipitate.

This occurs when the cations and anions of the two compounds combine to form an insoluble compound, which is not soluble in water and falls out of solution as a solid. The precipitation of ions is commonly used in chemistry to isolate, identify, or quantify different types of ions in a solution.

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Answer: I would suggest blue light glasses also go to a doctor because your eye veins are bullging and thats making it worse also Im not a doctor so i cant be sure but this is my tip also be careful looking under microscopes or anything with light.

Explanation:

Helium is depicted in orbital diagram A. (atomic number 2). It has one s orbital with two electrons in it.

The first to be filled will have a maximum of two electrons. The maximum of two electrons will then be placed in position 2s. The maximum number of six electrons will then be transferred to 2p.

A maximum of two electrons with the opposite spin can fit in any orbital. One 1s orbital and two electrons are contained within the first shell. 8 electrons are located in the second shell, with 2 in a 2s orbital and 6 in three 2p orbitals. There are 18 electrons in the third shell, with 2 in the 3s orbital and 6 in the three 3p orbitals.

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Absolute magnitude, on the other hand, is a measure of how bright a star would appear if it were located at a standard distance of 10 parsecs (32.6 light-years) away from Earth.

What is Magnitude?

Magnitude is a measure of the brightness of a celestial object, such as a star, planet, or galaxy. It is based on the amount of light that is emitted by the object and is typically expressed using a numerical scale. The lower the magnitude value, the brighter the object appears.

Apparent magnitude is a measure of how bright an object appears to an observer on Earth, while absolute magnitude is a measure of how bright an object would appear if it were located at a standard distance of 10 parsecs (32.6 light-years) away from Earth.

Apparent magnitude is a measure of how bright a star appears to an observer on Earth. It is determined by the amount of light that reaches Earth from the star, as well as the distance between the star and Earth. As humans travel away from our solar system and to other solar systems, the distance between them and the stars will change, which will affect how bright the stars appear to the travelers. As they move closer to a star, its apparent magnitude will increase, and as they move away, its apparent magnitude will decrease.

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1) Protons: 4

Neurons: 5

Electrons: 4

2) atomic number: 4

3) isotope

4) Mass: 9.012

Assuming that the student measured the mass of the elements using a balance and the volume using a graduated cylinder, we can use the following formula to calculate the density:

Density = mass / volume

Let's say the masses of the elements were 10.23 grams, 20.0 grams, and 21.5 grams, and the volumes were 10 mL, 20 mL, and 25 mL respectively.

Then, the densities would be:

Density of element 1 = 10.23 g / 10 mL = 1.023 g/mL

Density of element 2 = 20.0 g / 20 mL = 1.0 g/mL

Density of element 3 = 21.5 g / 25 mL = 0.86 g/mL

What is density?

Density is a physical property of matter that describes how much mass is contained in a given volume of a substance. It is defined as the amount of mass per unit volume, and is typically measured in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

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Answer:

Introduction: (5 points)

Before diving into each topic, it's important to understand why alternative energies are important. Fossil fuels are limited resources that produce harmful emissions and contribute to climate change. Therefore, we must turn to alternative energies to reduce our reliance on these resources and mitigate their negative impacts on the environment. In this presentation, we will discuss five alternative energies: Biomass, Geothermal, Hydroelectric, Hydrogen, Solar Power, and Wind Energy.

Biomass: (10 points)

1.

Biomass refers to organic matter, such as wood, crops, and waste, that can be converted into energy. Biomass can be used as a substitute for gasoline to run cars, trucks or buses.

2.

Biomass can be used to heat homes through wood stoves, pellet stoves, and biomass boilers.

3.

Advantages of biomass include its renewability, availability, and its ability to reduce waste. However, it can also lead to deforestation, land-use change, and pollution.

4.

Biomass energy production involves converting potential energy (stored in biomass) into kinetic energy (in the form of steam), which is then used to generate electricity.

Geothermal:

5.

Geothermal energy comes from the heat within the Earth's crust.

6.

Geothermal energy can be used to create electricity through steam turbines.

7.

Geothermal energy can be used directly to heat homes and factories through geothermal heat pumps.

8.

A heat pump is a device that transfers heat from a colder area to a hotter area.

9.

Advantages of geothermal energy include its reliability, low emissions, and its ability to provide heating and cooling. However, it can also lead to land subsidence, water pollution, and seismic activity.

Hydroelectric:

10.

Hydroelectric power is electricity generated from the movement of water.

11.

Moving water turns a turbine, which spins a generator to produce electricity. The dam is used to regulate the flow of water and to control the amount of electricity generated.

12.

Advantages of hydroelectric power include its renewability, efficiency, and ability to provide flood control. However, it can also lead to the displacement of communities, harm aquatic life, and reduce downstream water availability.

13.

The Hoover Dam in Nevada is an example of a hydroelectric power plant.

Hydrogen:

14.

Using hydrogen as a fuel source involves combining it with oxygen to produce energy in the form of electricity and water vapor.

15.

Hydrogen is found in water, fossil fuels, and organic matter.

16.

Advantages of using hydrogen as a fuel source include its renewability, abundance, and its ability to reduce emissions. However, it can also be expensive to produce, transport, and store.

17.

A fuel cell is an electrochemical device that converts hydrogen and oxygen into electricity. It works by passing hydrogen through an anode, where it is oxidized, producing electrons and protons. The electrons flow through a circuit to produce electricity, while the protons pass through a membrane to the cathode, where they combine with oxygen to form water.

Solar Power:

18.

Solar energy is energy from the sun that can be converted into electricity.

19.

A solar cell is made of a semiconductor material, such as silicon, that absorbs photons from the sun and generates electrons. These electrons flow through a circuit to produce electricity.

20.

Advantages of solar energy include its renewability, low emissions, and its ability to reduce dependence on fossil fuels. However, it can also be expensive to install, dependent on weather conditions, and can lead to land-use change.

21.

The Topaz Solar Farm in California is an example of solar energy being used in the U.S.

Wind Energy

22.

Wind energy is a type of renewable energy that comes from the wind. Wind energy is generated by the movement of air across the earth's surface caused by differences in temperature and pressure. Wind turbines are used to convert wind energy into electrical energy.

23.

Wind energy is converted into electrical energy by wind turbines. The turbines are equipped with blades that capture the wind and spin a rotor. The rotor turns a shaft, which drives a generator that produces electricity.

24.

Advantages of wind energy include:

Disadvantages of wind energy include:

25.

Alta Wind Energy Center in California is an example of a wind energy project in the US. It is one of the largest wind farms in the world, with a total capacity of 1,548 MW.

Answer: click thanks if you like my answer , have a good day !

According to the Ideal Gas Law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

If the number of moles and the temperature are doubled while the pressure remains constant, we can write:

(P)(2V) = (2n)(2R)(T)

Simplifying this equation, we get:

2PV = 4nRT

Dividing both sides by 2, we get:

PV = 2nRT

This equation shows that the new volume is directly proportional to the number of moles and temperature.

If we assume that the initial number of moles and temperature are 1 and T, respectively, and the initial volume is 3.0 L, then the new volume can be calculated as:

V' = (2n)(2R)(2T)/(P)

V' = 8(1)(0.0821)(2T)/P

V' = 1.65T/P

Therefore, the new volume is directly proportional to the temperature and inversely proportional to the pressure. Since the pressure remains constant, the new volume will be directly proportional to the temperature, which is doubled in this case.

Thus, the new volume will be double the original volume, and the correct answer is D: "The new volume is double the original volume."

Explanation:

hope its help <:

Carbon tetrachloride (CCl4) is commonly used as solvent in the preparation of alkynes.

CCl4 is a colorless, heavy, nonflammable liquid that was once widely used as a solvent and fire extinguisher.

It has a tetrahedral molecular geometry and is composed of one carbon atom and four chlorine atoms, which are covalently bonded.

However, due to its toxic and environmentally hazardous properties, carbon tetrachloride is no longer widely used in many applications.

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Based on the image given, scientists identified each type of pollen to study what types of plants were living in the area at different times in the past.

Pond sediment can preserve valuable historical data. Layers of sedimentary information can be used to provide a chronology of the history of a pond site. Allamuchy Pond sediments have been studied for their paleoclimate and paleoenvironmental information. Allamuchy Pond  sediments have been dated to the Pleistocene epoch, which lasted from about 2.6 million to 11,700 years ago. The Pleistocene was characterized by repeated cycles of glaciation and deglaciation, and it is possible that the sediments in Allamuchy Pond contain evidence of these cycles, such as glacial deposits or variations in sediment composition related to changes in climate. Additionally, the sediments may contain information about changes in local vegetation, water levels, or other environmental factors that occurred during the Pleistocene.

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Answer:

Continuous Spectrum, a spectrum that contains all wavelengths of light within a specific range, with no gaps or lines. It is produced by a hot, dense object such as a star or a light bulb.

Emission Spectrum, a spectrum that contains bright lines or bands of specific wavelengths, with dark spaces in between. It is produced when light is emitted from a hot gas or plasma, and the specific wavelengths of the lines or bands depend on the elements present in the gas.

Absorption Spectrum, a spectrum that contains dark lines or bands of specific wavelengths, with bright spaces in between. It is produced when a continuous spectrum passes through a cool gas, and the specific wavelengths of the lines or bands depend on the elements present in the gas.

Answer:

The standard free energy of formation, ΔGf°, of N2 at 25 °C and 1 bar is -16.5 kJ/mol. This means that when one mole of N2 is formed from its constituent elements (N2 in the gas phase at 1 bar and 25 °C), there is a release of 16.5 kJ of free energy. The negative sign indicates that the reaction is exothermic, meaning that it releases heat.

The standard enthalpy of formation of all elements in their standard states are assumed to be zero. The standard free energy of formation, ΔGf°, of N₂ at 25 °C and 1 bar is -16.5 kJ/mol.

The standard enthalpy of formation of a compound is defined as the enthalpy change accompanying the formation of one mole of the compound from its constituent elements.

When one mole of N₂ is formed from its constituent elements (N₂ in the gas phase at 1 bar and 25 °C), there is a release of 16.5 kJ of free energy.

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The balanced equation is 4NH₃ + 6N0 ---- 5N₂ + 6H₂O . The chemical reaction is balanced by hit and trail method  for ammonia reaction with nitric oxide .

A chemical reaction is the chemical transformation of one set of chemical components into another. Chemical reactions are often defined as changes that only affect the locations of electrons in the formation and breaking of chemical bonds between atoms, with no change to the nuclei (no change to the elements present), and can frequently be described using a chemical equation. Nuclear chemistry is a branch of chemistry that studies the chemical reactions of unstable and radioactive materials, which can result in both electronic and nuclear alterations.

The substance (or substances) that initiate a chemical reaction are known as reactants or reagents. Chemical reactions are often characterized by a chemical change and the formation of one or more products with features distinct from the original.

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The volume of the nitrogen oxide gas is 35.2 L

Stoichiometry is the quantitative study of reactants and products in a chemical reaction. It is used to determine the amount of reactants needed to produce a certain amount of product, or to determine the amount of product that will be produced from a given amount of reactant.

To apply stoichiometry;

We know that;

Number of moles of Cu = 150/ 63.5g/mol = 2.36 moles

If 3 moles of Cu produced 2 moles of NO

2.36 moles of Cu will produce 2.36 * 2/3

= 1.57 moles

If 1 moles of NO occupies 22.4 L

1.57 moles of NO will occupy 1.57 * 22.4/1

= 35.2 L

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Answer:

Here are six materials that are good insulators to keep ice from melting for at least twenty minutes:

Styrofoam: This material is often used to make insulated coolers because of its low thermal conductivity, which makes it an excellent insulator.

Fiberglass: This material is often used in insulation for walls and attics because it traps air and reduces heat transfer.

Polyurethane foam: This material is used to insulate refrigerators and freezers because of its excellent thermal insulation properties.

Cellulose insulation: This is a type of insulation made from recycled materials that provides good thermal insulation.

Mineral wool: This is a type of insulation made from natural rock materials that provides good thermal insulation and fire resistance.

Aerogel: This is a highly effective insulator made from a gel-like substance that has been dried to create a material that is more than 95% air. It is often used in scientific applications where extreme temperature control is required.

The balanced equation is:

Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2

To balance this equation using the atom inventory method, we need to make sure that the number of each type of atom is the same on both sides of the equation.

Let's start by looking at the left-hand side of the equation:

Cr(MnO4)3 + Sr(OH)2

We can see that there is one chromium (Cr) atom, three manganese (Mn) atoms, and 12 oxygen (O) atoms on the left-hand side.

Now let's look at the right-hand side of the equation:

Cr(OH)3 + Sr(MnO4)2

Here we have one chromium (Cr) atom, two manganese (Mn) atoms, and 14 oxygen (O) atoms.

So, we need to balance the equation by adding coefficients (numbers in front of each chemical formula) to make sure the number of each type of atom is the same on both sides.

Let's start by balancing the chromium (Cr) atoms:

Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + Sr(MnO4)2

Now we have one chromium atom on both sides.

Next, let's balance the manganese (Mn) atoms:

Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + Sr(MnO4)2

We have three Mn atoms on the left-hand side, but only two on the right-hand side. To balance this, we need to add a coefficient of 2 in front of Sr(MnO4)2:

Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + 2Sr(MnO4)2

Now we have two Mn atoms on both sides.

Finally, let's balance the oxygen (O) atoms:

Cr(MnO4)3 + 3Sr(OH)2 → Cr(OH)3 + 2Sr(MnO4)2

We have 12 O atoms on the left-hand side, but 20 O atoms on the right-hand side. To balance this, we need to add a coefficient of 5 in front of Cr(OH)3:

Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2

Now we have 12 O atoms on both sides.

So the balanced equation is:

Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2

Therefore, the coefficients are:

Cr(MnO4)3 + 3Sr(OH)2 → 5Cr(OH)3 + 2Sr(MnO4)2.

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