What mass of oxygen reacts with 12 grams of magnesium

143.25 grams of Fe2O3 will be produced.

Mole is an SI unit used to measure the amount of any substance.

First we can use the stoichiometry of the reaction to find the amount of Fe2O3 that will be produced if a certain amount of SO2 is produced.

From the balanced equation, it can be seen that for every 4 moles of FeS2 that react, 2 moles of Fe2O3 are produced, and for every 8 moles of SO2 that are produced, 2 moles of Fe2O3 are also produced.

Since 3.5861 moles of SO2 are produced, we can calculate the number of moles of Fe2O3 produced by dividing by 8 and multiplying by 2:

3.5861 moles SO2 / 8 moles Fe2O3/8 moles SO2 * 2 moles Fe2O3/2 moles SO2 = 0.8965 moles Fe2O3.

Finally, to convert moles of Fe2O3 to grams, we multiply by its molar mass (159.69 g/mol).

0.8965 moles Fe2O3 * 159.69 g Fe2O3/1 mole Fe2O3 = 143.25 g Fe2O3.

So, 143.25 grams of Fe2O3 will be produced.

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Answer:

the percentage is 1 every 5

Explanation:

When sodium acetate is dissolved in water, it is hydrolyzed into ions.

When a salt of weak acid or base is dissolved in water, this salt hydrolysis in it. Water ionises into hydroxide and hydrogen due to addition of sodium acetate. In water, sodium acetate splits into sodium and acetate ions.

So we can conclude that when sodium acetate is dissolved in water, it is hydrolyzed into ions.

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Answer:

The protons are located in the nucleus and have a positive charge

Explanation:

Answer:

The energy released from food was once energy from the sun that was captured by plants in the chemical process that forms plant matter (from air and water). Food provides animals with the materials they need for body repair and growth and the energy they need to maintain body warmth and for motion.

Answer:

Explanation: That energy inanimals food, used for body repair,growth, motion .It maintain body warmth, once energy from the sun.

Answer:

Endothermic animals are those that must generate their own heat to maintain an optimal body temperature.

Explanation:

Answer:

There

Explanation:

Endothermic animals are those that must generate their own heat to maintain an optimal body temperature. In ordinary language, these animals are commonly referred to as "warm-blooded." The term endotherm comes from the Greek endon, meaning within, and thermos, which means heat

The mass ratio of oxygen gas to carbon dioxide gas in the mixture will be equal, with a ratio of 1:1. This is because equal volumes of gases under the same conditions contain an equal number of particles.

When 1 liter of oxygen gas is mixed with 1 liter of carbon dioxide gas under the same conditions of temperature and pressure, the mass ratio of the gases in the mixture will be 1:1. This is because gases behave ideally, according to Avogadro's Law, which states that equal volumes of gases, under the same conditions of temperature and pressure, contain an equal number of particles. In other words, the number of moles of each gas in the mixture will be the same.

The molar mass of oxygen (O₂) is 32 g/mol, while the molar mass of carbon dioxide (CO₂) is 44 g/mol. Since both gases have the same volume and contain an equal number of moles, the mass ratio can be calculated using their molar masses.

Let's assume the volume of the gases is 1 liter each. In 1 liter of oxygen gas, there will be (1 mole of O₂). The mass of 1 mole of O₂ is 32 g. Therefore, the mass of oxygen gas in the mixture will be 32 g.

Similarly, in 1 liter of carbon dioxide gas, there will be (1 mole of CO₂). The mass of 1 mole of CO₂ is 44 g. Hence, the mass of carbon dioxide gas in the mixture will be 44 g.

Therefore, the mass ratio of oxygen gas to carbon dioxide gas in the mixture will be 32 g : 44 g, which simplifies to 8 g : 11 g or 1:1.

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Answer:

1.37cm

Explanation:

It's less than 1.4cm but more than 1.3cm. It's also more than 1.35cm so I guess the best answer would be 1.37cm or round up to 1.4cm

The degree of polymerization is 785.

Polymerization, or polymerization, is a manner of reacting monomer molecules together in a chemical response to form polymer chains or three-dimensional networks. there are numerous kinds of polymerization and specific systems exist to categorize them.

Calculation:-

A. M = Σ Xi Mi = 33040 g/mol

The number average molecular weight (Mw) = 33,040 g/mol

B. The weight average molecular weight

Mw  =  Σ Xi Mi = 240 + 2000 + 5600 + 10800 + 11880 + 5720

⇒ 36240 g/mol

The weight average Molecular weight Mw = 36240 g/mol

C. The degree of polymerization

Given,

At a weight of C = 12.01 g/mol

At a weight of H = 1.008 g/mol

For polypropylene, the repeat unit molecular weight is

m = 3(Ac) + 6(Ah)

3(12.01) + 6(1.008)

= 36.03 + 6.048

= 42.07 g/mol

So the Degree of polymerization is = Mn/m

                                                     = 33040/42.07

                                                     = 785

A polymer is a huge unmarried chain-like molecule wherein the repeating devices derived from small molecules referred to as monomers are sure collectively. The system by which monomers are converted into a polymer is known as polymerization. for example, ethylene polymerizes to form polyethylene.

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Explanation:

The species with a positive charge over it, which means lack of electrons are called cations. Whereas the species with negative over it, meaning it has an excess of electrons with it are called anions.

From the list given the cations are

H+, Ba2+, Hg2+, Li+, Ca2+ and Fe2+

Whereas anions from the list are

O-2, Br-5, F-, S-2.

A Combination of cation and anions make an ionic compound in which cation is written first and then anion.

1. B, the energy associated with the motion of an object

2. C, 12.4 g/mL

3. C, 5

1) B) Kinetic energy is energy associated with the motion of an object.

2) B) Density equals mass divided by volume: 1.38 g/mL

3) C) There are 5 significant figures in 20.300

4) A) 80 is the atomic number for mercury on the periodic table.

5) E) The formula for copper (II) sulfate pentahydrate is CuSO4•5H2O

So in summary:

• Kinetic energy is the energy of a moving object due to its motion.

• Density is calculated by dividing an object's mass by its volume.

• Significant figures refer to the known precision of a measurement based on the digits reported.

• Atomic symbols represent elements on the periodic table.

• Chemical formulas use symbols of the elements to show the proportions of atoms in a compound.

Answer:

Computer.

Explanation:

The computer is moving more than the floor, at least, it's moving when people are typing on it.

35g

Noting the mass of scientific tools such as beakers can help us take the mass of liquids and other samples that cannot be measured on their own.

Mass of the Liquid

To find the mass of the liquid, we have to know the mass of the beaker. Then, we can subtract the mass of the beaker from the mass of the liquid and beaker combined. This will leave the mass of the liquid.

The liquid has a mass of 35g.

Significant Figures and Units

Whenever doing scientific calculations, it is important to include significant figures and units.

Significant figures show the accuracy of a measurement. When, subtracting numbers, round to the smallest number of decimal places. Neither measurement has decimal points, thus the answer also should not have a decimal point. Thus the answer is just 35.

Then, make sure you have units. Since the original measurements are in grams, the answer should also be in grams. So, the final answer is 35 grams.

Answer:

No picture :(

Explanation:

Answer:

it is a chemical process

Explanation:

rusting is the formation of reddish-brown ferric oxides on iron by low-temperature oxidation in the presence of water.

The chemical formula for rust is Fe2O3 and is commonly known as ferric oxide or iron oxide. The final product is a series of chemical reactions simplified below as- The rusting of the iron formula is simply 4Fe + 3O2 + 6H2O → 4Fe(OH)3. The rusting process requires both the elements of oxygen and water.

Answer:

The forum user pointed out that energy began transferring into the lake as ... How can you use the information from the Sim to respond to the blogger

Explanation:

Insulin resistance is a key factor in the development of T2DM, leading to elevated fasting blood glucose, sustained OGTT, and elevated blood fatty acid levels.

Insulin resistance occurs when the body's cells become less responsive to insulin, which is needed to move glucose from the bloodstream into cells for energy. As a result, glucose accumulates in the bloodstream, leading to elevated fasting blood glucose levels. Sustained OGTT (oral glucose tolerance test) occurs when the body is unable to properly regulate blood glucose levels after consuming a high-carbohydrate meal, which is a hallmark of T2DM.

Insulin resistance also causes the body to release more fatty acids into the bloodstream, leading to elevated blood fatty acid levels. This can further exacerbate insulin resistance by interfering with insulin signaling pathways. Therefore, addressing insulin resistance is key to managing T2DM and preventing its complications.

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c. Solution A, with a pH of 4, has 100 times more hydrogen ions (H+) than solution B, which has a pH of 6.

The pH scale is a logarithmic scale that measures the concentration of hydrogen ions in a solution. Each unit on the pH scale represents a tenfold difference in hydrogen ion concentration. Therefore, a pH of 4 indicates a concentration of hydrogen ions that is 100 times greater than a pH of 6. This means that solution A has 100 times more hydrogen ions than solution B.

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Answer:

The pH indicates how acidic or basic a solution is.

Explanation:

i just took the test and got it right.

pH of a solution is the measure of how acidic or basic the solution is. It is determined based on the H+ ion concentration in the solution. Hence, option C is correct.

pH of a solution is the measure of the H+ ion concentration in a solution. It determines the acidity or basicity of the solution. Mathematically it is the negative logarithm of H+ ions concentration.

pH = - log [H+]

A pH scale can be used to determine the acidity or basicity of a solution. If the basicity is 7, then the solution is neutral. If the pH is less than 7 then the solution is acidic and a pH above 7 is basic solution.

Red- green color in pH scale represent the acidic solution where green is neutral and cyan to dark blue color is given by bases. Using a litmus paper the acidity can be checked based on these color change.

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the production of carbon dioxide is one of the causes of exercise-induced ph de crease. since co2 is a gas and can be eliminated by the lungs, it is often referred to as a(n) Acid.

The production of carbon dioxide (CO2) during exercise contributes to a decrease in pH, leading to exercise-induced acidosis. CO2 is a gas produced as a byproduct of cellular respiration. When CO2 dissolves in water, it forms carbonic acid (H2CO3), which dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3-).

The increase in hydrogen ions lowers the pH of the blood and tissues, resulting in an acidic environment. To maintain homeostasis, the excess CO2 and hydrogen ions are eliminated by the lungs through respiration. This is why CO2 is often referred to as an acid because it contributes to the acid-base balance in the body.

During exercise, the increased metabolic activity leads to higher CO2 production and subsequent acidification. The respiratory system plays a crucial role in removing CO2 from the body, helping to regulate the acid-base balance and maintain physiological function.

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The use of a specialized mixture of gases for breathing, an apparatus for the delivery of the gases,, This is an example of behavioral adjustment .

The use of a specialized mixture of gases for breathing apparatus for the delivery of the gases, protective clothing, and gear to increase visibility for underwater diving is an example of the behavioral adjustment. T he behavioral adjustment is the individuals quality to adjust one's  behavior to environment. this above example is the example of the behavioral adjustment.

the behavioral adjustment is the adjustment such as adopting the sleeping postures, walk at all times, use manners,  become a good listener and allow other to learn, gives respect to other, keep a space neat and clean.

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One 94-pound bag of Portland cement equals 1.12 cubic feet.

The weight of the Portland cement and the volume of space it occupies have a significant relationship when it comes to its uses. Cement bags are normally labelled with the weight of the cement and the volume of space that they occupy when mixed with water and sand to make a paste and applied to the surface. One of the most popular cement types is Portland cement, which is used in the construction of many structures.

For example, Portland cement is used to produce concrete, which is used to construct buildings, bridges, and other structures. The amount of Portland cement required to complete a construction project is calculated by dividing the volume of space required by the quantity of cement in a bag. Portland cement bags come in various sizes, each with a weight-to-volume ratio. The weight-to-volume ratio is the quantity of cement required to fill a certain volume of space. A 94-pound bag of Portland cement, for example, fills 1.12 cubic feet of space.To estimate the amount of Portland cement required for your construction project, calculate the volume of space required, then divide it by the weight-to-volume ratio of a 94-pound bag of Portland cement (1.12 cubic feet).

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The visual indicator that enough of a drying agent , such as anhydrous MgSO4 or CaCl2 has been added to properly dry an organic solution is that the drying agent will move freely like a powder around the solution .

Because the anhydrous form is hygroscopic ( readily absorbs water from the air ).

What is the work of anhydrous magnesium sulphate ?

Magnesium sulphate is frequently used in the laboratory as an indicator, especially after aqueous work-up . aqueous work-up is a common technique in the lab to get rid of residual impurities after completion of a reaction . for this the organic reaction is cooled to room temperature and mixed with water .specific impurities will then diffuse into the aqueous phase and can be separated with a separatory funnel .

unfortunately some residual water will stay in the organic phase and this can have negative impact for characterization of compound . therefore Magnesium sulphate is added ,which is able to catch the residual water in its crystal lattice .after filtration of the solid magnesium sulfate ,the water is reduced to non-significant amount and the compound ready for further investigation.

Similarly , calcium chloride is strongly hygroscopic ( absorbs water from the environment ) , so it removes moisture from the air ,making it dryer . this results in water  in the substance to be dried to evaporate into the drier air and this cycle repeats until the system reaches an equilibrium.

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The radius of a barium atom is 2.68 Å.

Barium is a chemical element that is silvery-white in color and can be found in the periodic table with the symbol Ba.

The density of barium is 3.51 g/cm3, and it has a body-centered cubic unit cell that crystallizes.

Determine the length of the edge of the unit cell. Since barium has a body-centered cubic unit cell, the length of the edge of the unit cell:

Edge length = 4r /√3

Where r is the radius of the atom.

The volume of the unit cell using the formula:

Volume of unit cell = Edge length³

The number of atoms present in the unit cell. Since barium has a body-centered cubic unit cell, the number of atoms present in the unit cell :

Number of atoms in the unit cell = 2

The mass of a single atom of barium using the formula:

Mass of a single atom = Density of barium / Avogadro’s number

Where Avogadro’s number is 6.02 × 10²³ atoms/mol.

The radius of a barium atom using the formula:

Radius of barium atom = (3 × volume of unit cell / 4 × π × number of atoms in the unit cell)¹/³

The radius of the barium atom :

Edge length = 2r√3

r = (Edge length) / 2√3

Volume of the unit cell = (Edge length)³

Number of atoms in the unit cell = 2

Mass of a single atom = Density of barium / Avogadro’s number

Radius of barium atom = (3 × volume of unit cell / 4 × π × number of atoms in the unit cell)¹/³

Therefore, the radius of a barium atom is 2.68 Å.

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Answer:

Element

Explanation:

It's C4 so there are four carbons.

Hope this helped! :))

\(\bold{\huge{\blue{\underline{ Solution}}}}\)

We have given in the question that,

We know that,

Amount of heat required = Mass * specific heat * change in temperature

[ Specific Latent heat of fusion is the amount of heat required to change one mole of substance from solid to liquid phase without changing in temperature .]

But, For complete melting of substance without change in temperature

Amount of heat required = Mass * Specific latent heat of fusion

Subsitute the required values,

\(\sf{\red{ Q = MCl}}\)

Where,

Now,

\(\sf{ Q = 4 × 334000}\)

\(\sf{ Q = 1336000 J }\)

\(\sf{ Q = 1336 KJ }\)

Hence, The amount of heat required to melt 4kg ice is 1336KJ

\(\bold{\red{ Option\: A \:is\: correct }}\)

Taking into account the definition of calorimetry and latent heat, the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 \(\frac{J}{kg}\) is 1,336 kJ.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Latent heat is defined as the energy required by a quantity of substance to change state.

When this change consists of changing from a solid to a liquid phase, it is called heat of fusion and when the change occurs from a liquid to a gaseous state, it is called heat of vaporization.

The heat Q that is necessary to provide for a mass m of a certain substance to change phase is equal to

Q = m×L

where L is called the latent heat of the substance and depends on the type of phase change.

In this case, you know:

Replacing in the expression for latent heat:

Q = 4 kg× 334,000 \(\frac{J}{kg}\)

Solving:

Q= 1,336,000 J= 1,336 kJ (being 1,000 J= 1 kJ)

Finally, the correct answer is the first option: the heat energy required to melt 4 kg of ice when the specific latent heat of fusion of water is 334,000 \(\frac{J}{kg}\) is 1,336 kJ.

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Answer:

To find the pOH, simply subtract the pH from 14. In order to calculate the pOH, take the negative log of the hydroxide ion concentration.

Explanation:

Hope this helps :3

The gas phase decomposition of ethyl chloroformate (ClCOOC2H5C2H5Cl) produces carbon dioxide (CO2). The given information states that the rate constant at k is /s and the rate constant at k is /s. Additionally, the activation energy for the gas phase decomposition of ethyl chloroformate is given as kj/mol.

To further explain, the rate constant (k) is a measure of how quickly a reaction occurs. It represents the proportionality constant between the concentration of the reactants and the rate of the reaction.

In this case, the decomposition of ethyl chloroformate is a chemical reaction in which it breaks down into carbon dioxide. The rate constant (k) provides information about the speed at which this decomposition occurs.

The rate constant at k is /s indicates the rate of the decomposition reaction when the reactants are at a certain temperature and pressure. Similarly, the rate constant at k is /s represents the rate of the reaction at a different temperature and pressure.

The activation energy (Ea) is the minimum energy required for a reaction to occur. In the given information, it is specified as kj/mol. This means that in order for the decomposition of ethyl chloroformate to take place, a minimum energy of kj/mol must be provided.

It is important to note that the activation energy affects the rate constant. As the activation energy increases, the rate constant decreases, resulting in a slower reaction. Conversely, when the activation energy decreases, the rate constant increases, leading to a faster reaction.

In summary, the given information provides the rate constants (k) for the decomposition of ethyl chloroformate at different conditions, as well as the activation energy (Ea) required for the reaction to occur. The rate constant reflects the speed of the reaction, while the activation energy represents the minimum energy needed for the reaction to take place.

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