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The mass of carbon monoxide that has been used in the reaction is 5.296 g.

To solve this problem, we need to use stoichiometry which deals with the quantitative relationships between reactants and products in chemical reactions.

The balanced chemical equation for the reaction is:

Fe₂O₃ + 3CO → 2Fe + 3CO₂

This equation tells us that for every 2 moles of Fe₂O₃ and 3 moles of CO that react, we get 2 moles of Fe and 3 moles of CO₂.

We are given the mass of iron that was recovered, and the percentage yield of the reaction. The percentage yield is a measure of how much product is actually obtained compared to the theoretical yield, which is the amount of product that would be obtained if the reaction proceeded to completion.

To calculate the theoretical yield of iron, we need to use stoichiometry and the given amount of carbon monoxide used in the reaction. We can use the following equation to calculate the amount of carbon monoxide used:

n = m/M

where n is the number of moles of carbon monoxide used, m is the mass of iron recovered, and M is the molar mass of iron.

Using the given values, we get:

n = 15.88 g / 55.845 g/mol = 0.2838 mol

This is the number of moles of iron that would be produced if the reaction proceeded to completion.

To calculate the theoretical yield of iron, we can use the stoichiometry of the balanced chemical equation. For every 3 moles of carbon monoxide used, 2 moles of iron are produced. So, the number of moles of carbon monoxide used is:

nCO = (2/3) × n = (2/3) × 0.2838 mol = 0.1892 mol

To calculate the mass of carbon monoxide used, we can use the following equation:

mCO = nCO × MCO

where mCO is the mass of carbon monoxide used, and MCO is the molar mass of carbon monoxide, which is 28.01 g/mol.

Using the given values, we get:

mCO = 0.1892 mol × 28.01 g/mol = 5.296 g

Therefore, the mass of carbon monoxide used in the reaction is 5.296 grams.

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Answer:

number of protons and neutrons

Explanation:

Answer:

o responsible for digestion in the cell

o found outside of the membrane

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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Answer:

2000\(cm^{3}\)

Explanation:

So the equation of volume of a rectangular solid is:

V= l * w * h

Where l is length w is width and h is height

To find the volume:

V= 40 * 10 * 5

V= 400 * 5 ( multiply 40 and 10 to get 400)

V= 2000 \(cm^{3}\) ( multiply 400 and 5 to get 2000)

The unit for volume is \(cm^{3}\) in this case.

HOPE THIS HELPED

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

\(volume = \frac{mass}{density} \\ \)

From the question we have

\(volume = \frac{1.20}{0.879} \\ = 1.365187713...\)

We have the final answer as

Hope this helps you

When a glass rod is held over a burning candle, physical change as well as chemical change occurs in the glass rod as well as the candle wax respectively.

Physical and chemical changes occur while a candle burns. Physical changes occur in a burning candle when the candle wax melts and forms liquid wax when heated. It is a bodily transformation. Because it solidifies again when cooled. This is also a change that may be reversed. Chemical Changes in a Burning Candle When you burn the candle, the wax around the wick melts. The wick of the candle is absorbed by liquid wax. The heat created by the flame causes the liquid wax to evaporate. This wax vapor burns near the flame, producing new chemicals such as carbon dioxide, carbon soot, water vapors, heat, and light. This is a permanent alteration.

A chemical change is illustrated by the burning of a candle. Two reactants unite to generate new products in chemical reactions. Wax is a kind of hydrocarbon. When hydrocarbons burn, they react with oxygen to produce carbon dioxide and water vapor.

A candle wick transports fuel by a method known as capillary action. Through the wick, liquid fuel (wax) reaches the flame, vaporizes, and burns. The candle wicks devour themselves before the wax is eaten. The wicks are coated with wix to supply the initial fuel source, and when consumed, the wicks are transformed to \(CO_2\) and water vapor through the chemical process known as burning.

The blackening of a glass rod is only a physical change. Glass rod's chemical structure will not have altered. Soot has accumulated on the glass rod. The rod has no effect on anything.

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Answer:

Powering society: Energy is essential for powering homes, businesses, industries, and transportation systems. It enables the functioning of modern society by providing electricity, heating, cooling, and mechanical power.

Economic growth: Reliable and affordable energy sources contribute to economic growth and development. Industries rely on energy to manufacture products, operate machinery, and provide services. Access to energy supports job creation, increases productivity, and drives economic competitiveness.

Improved quality of life: Energy plays a crucial role in improving the quality of life for individuals and communities. It enables access to clean water, sanitation, healthcare services, education, and information technology. Energy-powered devices and appliances enhance comfort, convenience, and entertainment.

Sustainable development: Renewable energy sources such as solar, wind, hydro, and geothermal offer advantages in terms of environmental sustainability. They help reduce greenhouse gas emissions, mitigate climate change, and decrease dependence on finite fossil fuel resources. Renewable energy also promotes energy diversification and enhances energy security.

Innovation and technology: The energy sector drives innovation and technological advancements. Research and development in energy technologies lead to more efficient, cost-effective, and environmentally friendly solutions. Advancements in energy storage, grid infrastructure, and smart systems contribute to a more resilient and flexible energy supply.

Environmental benefits: Transitioning to cleaner energy sources helps mitigate environmental issues. Renewable energy generation produces minimal air and water pollution, reducing the negative impact on ecosystems and human health. Decreased reliance on fossil fuels reduces carbon dioxide emissions, combating climate change.

Energy independence: Diversifying energy sources and reducing dependence on imports enhances energy security for countries. By developing domestic energy resources and investing in renewable energy, nations can reduce vulnerability to price fluctuations, geopolitical tensions, and supply disruptions.

Rural electrification: Energy access is crucial for rural areas where many people lack electricity. Reliable energy supply promotes economic opportunities, improves healthcare and education services, and enhances overall living conditions in rural communities.

Answer:

8,95

Explanation:

Density is equal to mass/volume

\(D=\frac{m}{v} \\D= \frac{1668g}{186.2} \\D = \frac{8,95g}{cm^3} \\\)

approximately

Curiosity:

Did you knew that is because of his low density that ships can fluctuate?

Despite their big mass, their volume are far greatter, so the Buoyancy Force acts heavily on them.

Answer:

the answer I suggesting B

131 mL of the original volume should be diluted with 131 mL - 49.0 mL = 82.0 mL of water to obtain the desired concentration.

What is volume?

Volume is a measure of the amount of space occupied by a three-dimensional object or substance. It is typically measured in cubic units, such as cubic centimeters (cm^3), cubic meters (m^3), or milliliters (mL).

To solve this problem, we need to first calculate the amount of CuCl2 in 49.0 mL of the original solution, and then determine the volume that should be added to dilute the solution to this concentration.

First, let's calculate the amount of CuCl2 in 49.0 mL of the original solution. Using the concentration of the solution (7.95 mM), we can calculate the number of moles of CuCl2 in 49.0 mL of the solution:

(7.95 mM) * (49.0 mL) * (10^-3 L/mL) = 0.388 moles CuCl2

Next, we can use the moles of CuCl2 to calculate the mass in grams:

0.388 moles * (134.45 g/mol) = 51.99 g

So, 49.0 mL of the original solution contains 51.99 g of CuCl2.

Next, we want to find the volume that should be added to dilute the solution to a concentration such that 49.0 mL of the diluted solution contains 4.56 g of CuCl2. We can use the formula:

C1V1 = C2V2

where C1 is the concentration of the original solution, V1 is the volume of the original solution, C2 is the concentration of the diluted solution, and V2 is the volume of the diluted solution. Rearranging the formula to solve for V2:

V2 = (C1V1) / C2

Plugging in the known values:

V2 = (7.95 mM * 49.0 mL) / (4.56 g / (49.0 mL))

Converting the concentration from mM to g/mL:

V2 = (7.95 mM * 49.0 mL) / (4.56 g / (49.0 mL)) = (7.95 * 10^-3 * 49.0) / (4.56 / 49.0)

V2 = 49.0 mL * (7.95 * 10^-3) / (4.56 / 49.0 g/mL) = 49.0 mL * (7.95 * 10^-3) * (49.0 g/mL) / 4.56 g

V2 = 49.0 mL * 7.95 * 10^-3 * 49.0 / 4.56 = 49.0 mL * 3.52

So, 131 mL of the original volume should be diluted with 131 mL - 49.0 mL = 82.0 mL of water to obtain the desired concentration.

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Answer:

O A. The electrons orbit the protons at the atom's center

Explanation:

It was proved by Bohr that electrons are revolving in orbits which creates magnetic fields around the atom.

To determine when the conversion of 1-bromobutane to 1-butanol is complete, infrared (IR) spectroscopy can be used.

IR spectroscopy can be used to monitor the reaction by observing the disappearance of the characteristic absorption peak of the C-Br bond in 1-bromobutane at around 600-650 cm^-1. As the reaction progresses, the intensity of this peak will decrease, indicating that the C-Br bond is being broken and replaced by the C-O bond in 1-butanol.

The appearance of a new peak in the IR spectrum at around 1050-1150 cm^-1, which corresponds to the C-O bond in 1-butanol, also confirms the completion of the reaction. Therefore, by monitoring the disappearance of the C-Br peak and the appearance of the C-O peak, IR spectroscopy can be used to determine when the reaction is complete.

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The formula for a compound made from x2 and y- can be predicted using the crisscross method.

X2 has a charge of 2+ while y- has a charge of 1-. To form a neutral compound, the charges must balance each other.

To do this, the charge of x2 will become the subscript of y, and the charge of y- will become the subscript of x2.

Thus, the formula for the compound will be written as X2Y.

This indicates that two atoms of x combine with one atom of y to form the compound.

The compound may have different properties and characteristics depending on the identity of the elements X and Y.

Overall, the crisscross method is an effective way to predict the formula of an ionic compound.

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The steady-state concentration of pollutant in the lake is 3.75 mg/l.

To find the steady-state concentration of the pollutant in the lake, we need to set the input of pollutant from the stream and factory equal to the output of pollutant due to decay and outflow from the lake. The equation for this balance is:

(Inflow from stream + Inflow from factory) - (Outflow + Decay) = 0

Using the given values, we can write:

(5 m3/s x 1.0 mg/l + 0.5 m3/s x 220 mg/l) - (5.5 m3/s x C x 1.2 x 10^6 m3 + 0.20/day x C x 1.2 x 10^6 m3 / 86400 s/day) = 0

where C is the steady-state concentration of the pollutant in mg/l. Solving for C, we get:

C = (5 m3/s x 1.0 mg/l + 0.5 m3/s x 220 mg/l) / (5.5 m3/s x 1.2 x 10^6 m3 / 86400 s/day + 0.20/day x 1.2 x 10^6 m3 / 86400 s/day)

C = 3.75 mg/l

Therefore, the steady-state concentration of the pollutant in the lake is 3.75 mg/l.

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Answer:

0.086

Explanation:

got it on acellus

The mass of the dry solute recovered from the given data is 0.086 g.  Option C

To determine the mass of the dry solute recovered, we need to subtract the mass of the boat from the mass of the boat with the dry solute.

Given the data provided:

Boat Mass: 0.730 g

Boat + Solution: 0.929 g

Boat + Dry: 0.816 g

To find the mass of the dry solute, we subtract the boat mass from the boat + dry mass:

Mass of Dry Solute = (Boat + Dry) - (Boat Mass)

Mass of Dry Solute = 0.816 g - 0.730 g

Mass of Dry Solute = 0.086 g

Therefore, the correct answer is c) 0.086 g.

The mass of the dry solute recovered from the given data is 0.086 g. It is important to note that the mass of the dry solute is obtained by subtracting the mass of the boat from the mass of the boat with the dry solute, as the boat mass represents the weight of the empty boat or container used in the experiment.

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The end of a very long 5-mm-diameter rod is held at 124°C. The surface of the rod is exposed to ambient air at 30°C, with a convective heat transfer coefficient of 100 W/m2K. Determine the temperature at a radial distance of 2.5 mm from the rod's center. The thermal conductivity of the rod is 15 W/mK.b) What is the temperature gradient in the rod at this location?c).

What is the heat flux at this location?The temperature at a radial distance of 2.5 mm from the rod's center is 79.58°C.The solution for this problem can be found by following the steps below:Solution:a) The temperature of the rod, T, can be calculated using the formula for one-dimensional conduction:q/A = -k (d T/d r)whereq is the heat flux,A is the cross-sectional area of the rod,r is the radial distance from the center of the rod,k is the thermal conductivity of the rod,and T is the temperature of the rod.

Taking the boundary condition into account,T(r=0) = 124°CandT(r=2.5 mm) = 30°C, the solution to the differential equation is:T = T0 + (T1 - T0) (r/R)2whereT0 = 30°CT1 = 124°CR = 2.5 mm/2 = 1.25 mmso,T = 30 + (124 - 30) (r/1.25)2 = 30 + 78 (r/1.25)2at r = 2.5 mm,T = 79.58°Cb) The temperature gradient, d T/d r, is given by the derivative of the above equation:d T/d r = 124 (r/1.25)2 / 1.25where d T/d r = 98.72°C/mat r = 2.5 mmc) The heat flux, q/A, is given by the Fourier's law of heat conduction:q/A = -k (d T/d r)whereq/A = -15 (98.72/1000) = -1.48 W/m2at r = 2.5 mmTherefore, the temperature at a radial distance of 2.5 mm from the rod's center is 79.58°C, the temperature gradient in the rod at this location is 98.72°C/m, and the heat flux at this location is -1.48 W/m2.

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=> 0.25 M

The question is asking us to find the molarity/concentration of the acid (HCl).

We have been provided with;

12.50 mL of 0.20 M NaOH

10.0 mL of HCl

We know that molarity (M) of a solution is contained in 1 L or 1000 mL or 1000 cm³.

This means that;

0.20 M is contained in 1000 mL.

X mol is contained in 12.50 mL

\( x \: mol \: = \frac{12.50 \times 0.20}{1000} \\ = 0.0025 \: moles\)

= 0.0025 moles

These 0.0025 moles is contained in 10 mL of HCl.

To find the molarity of the acid;

0.0025 moles is contained in 10 mL

x mol is contained in 1000 mL

\(x \: mol \: = \frac{0.0025 \times 1000}{10} \\ = 0.25 \: mol\)

= 0.25 M

Therefore the Concentration of the acid (HCl) is 0.25 M

The mass of chloroform that contains 2.36 × 10^15 molecules of chloroform is 2.33 x 10^-7 g. This can be calculated using Avogadro's number, the molar mass of chloroform, and the number of molecules given.

To calculate the mass, first determine the number of moles of chloroform in 2.36 × 10^15 molecules:

2.36 × 10^15 molecules / 6.022 × 10^23 molecules/mol = 3.92 × 10^-9 mol

Next, use the molar mass of chloroform, which is 119.38 g/mol, to convert moles to grams:

3.92 × 10^-9 mol x 119.38 g/mol = 4.67 × 10^-7 g

Therefore, the mass of chloroform that contains 2.36 × 10^15 molecules of chloroform is 2.33 x 10^-7 g.

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The sodium-potassium ion pump found in cell membranes is made of amino acids. Option A is correct option.

The sodium-potassium ion pump is a type of integral membrane protein that actively transports sodium ions (Na+) out of the cell and potassium ions (K+) into the cell.

This pump plays a crucial role in maintaining the electrochemical gradient across the cell membrane, which is necessary for various cellular functions.

Amino acids are the building blocks of proteins, and proteins are composed of one or more polypeptide chains. The sodium-potassium ion pump is a protein, and its structure is formed by a specific arrangement of amino acids.

These amino acids contribute to the pump's ability to bind and transport sodium and potassium ions across the cell membrane.

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Liquid to gas - Boiling: The phase change from a liquid to a gas that occurs when the substance reaches its boiling point, resulting in the formation of vapor.

Solid to gas - Sublimation: The phase change from a solid directly to a gas without going through the liquid state.

Solid to liquid - Melting: The phase change from a solid to a liquid when heat is applied, causing the substance to transition from a rigid to a more fluid state.

Liquid to solid - Freezing: The phase change from a liquid to a solid when the substance loses heat, resulting in the formation of a solid crystal lattice.

Therefore, the correct match would be:

Liquid to gas - Boiling

Solid to gas - Sublimation

Solid to liquid - Melting

Liquid to solid - Freezing

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The H₂0 is molecule with smallest bond angle among other molecules.

The central oxygen atom, which has two lone pairs of electrons, forms two sigma bonds with the two peripheral hydrogen atoms in the Lewis structure of water. According to valence bond theory, H₂O is sp3 hybridized, meaning that the 2s atomic orbital of oxygen and its three 2p orbitals combine to generate four new hybridised orbitals. These new hybridized orbitals then interact with the hydrogen 1s orbitals to form a bond. As a result, sp3 hybridization's expected shape and bond angle are tetrahedral and 109.5°, respectively. This is completely consistent with the actual bond angle of 104.45 degrees. The oxygen atom in the water molecule possesses an extra pair of lone pair electrons, which slightly distorts the bond angle from 109 to 104.5.

Hence, lone pair of oxygen is responsible for decreased bond angle of H₂0.

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Rhombic sulfur and monoclinic sulfur are the two primary allotropes of sulfur.

Allotropes are various versions of the same element that can exist in various crystal shapes or physical states. An element's several allotropes each have different physical and chemical characteristics. For instance, carbon can exist in a variety of allotropes, each with a unique set of properties and applications, such as diamond, graphite, and fullerene.

The most prevalent type of sulfur is rhombic sulfur, which is yellow in hue. It is made up of S8 rings that have been puckered into a chair-like conformation. Rhombic sulfur is insoluble in water and stable at temperatures lower than 96°C. Insecticides, fertilizers, and sulfuric acid are all made with it.

Compared to rhombic sulfur, monoclinic sulfur is less frequent and denser. Although it has golden crystals as well, they resemble needles. Monoclinic sulfur can dissolve in some solvents, such as carbon disulfide, and is stable above 96°C. Both the vulcanization of rubber and the creation of gunpowder use it.

The 58 molecules that make up both types of sulfur are the same, but their crystal shapes and physical characteristics are different. Other allotropes of sulfur, like amorphous sulfur and plastic sulfur, which have different structures and characteristics from rhombic and monoclinic sulfur, can also occur.

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Answer:

Silk! All the others were inventions of the Han period.

Explanation:

Silk fabric was invented in Ancient China. Legend has it that the process for making silk cloth was first invented by the wife of the Yellow Emperor, Leizu, around the year 2696 BC.

- profparis

Answer:

Explanation:

9. You know the total pressure of all the gases is 1.0 atm. You also know the partial pressure of two of the gases:

Partial pressure of He = 0.43 atm

Partial pressure of CO₂ = 0.05 atm

Partial pressure of O = x

0.43 atm + 0.05 atm + x = 1.0 atm

0.48 atm + x = 1.0 atm

Subtract 0.48 atm from both sides of the equation.

x = 1.0 atm - 0.48 atm = 0.52 atm

The partial pressure of O is 0.52 atm.

10. You know the total pressure of all the gases is 32.9 atm. You also know the partial pressure of two of the gases:

Partial pressure of O₂ = 6.6 atm

Partial pressure of N₂ = 23 atm

Partial pressure of CO₂ = x

6.6 atm + 23 atm + x = 32.9 atm

29.6 atm + x = 32.9 atm

Subtract 29.6 atm from both sides of the equation.

x = 32.9 atm - 29.6 atm = 3.3 atm

The partial pressure of CO₂ is 3.3 atm.

11. The volume of the balloon decreases due to the increased pressure at that depth.

It is true that 1,3-butadiene has the chemical formula C4H6 and is a conjugated diene. A popular monomer in the creation of synthetic rubber, polymers, and resins, it is a colourless, flammable gas.

A conjugated diene with the chemical formula C4H6 is 1,3-butadiene. A popular monomer in the creation of synthetic rubber, polymers, and resins, it is a colourless, flammable gas. Because of the butadiene's conjugated double bond system, pi-electrons are delocalized over the whole molecule, giving it special characteristics including high reactivity, a low boiling point, and a propensity for addition reactions. Butadiene is a crucial industrial chemical that is created by the catalytic dehydrogenation of butene or butane. It finds usage in a variety of petrochemical, polymer, and automotive applications.

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Answer:

Geosphere

Explanation:

The sphere that was affected by this transformation is the geosphere.

The geosphere is the solid part of the earth which is made up of rocks and soils.

1.8 moles of nitrogen react with 3 moles of hydrogen to form 2 moles of ammonia.

The chemical equation for the reaction is:

N2 + 3H2 → 2NH3

Therefore, 2 moles of ammonia are formed.

Ammonia is an odourless gas that has a potent scent.. It is the main component of many industrial and household cleaning products, and is also used widely in agriculture as a fertilizer. Ammonia can be hazardous to human health if inhaled, ingested, or if it comes in contact with the skin or eyes. Inhalation of high concentrations of ammonia can cause irritation of the eyes, nose, throat, and lungs. Ingestion of ammonia can cause severe damage to the digestive system.

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A possible solution to solve erosion and/or deposition on a school campus is to replant the surrounding surface with vegetation in order to avoid the loss of soil.

Erosion is a relatively slow geological process associated with the loss of soil material due to environmental factors such as winds that remove the superficial layer in a given area.

The best solution to solve erosion in a school campus is to surround it with plants in order to avoid direct winds that may erode the soil during the dry period.

In conclusion, a possible solution to solve erosion and/or deposition on a school campus is to replant the surrounding surface with vegetation in order to avoid the loss of soil.

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