calculate the amount of heat energy required to evaporate 25.7g of water at 100 degrees celcius. (Molar heat of vaporization of liquid water= 4.07x10^4 J/mol)

Answer:

X = ²³⁵₉₂U

Explanation:

The isotope of plutonium-239 undergo alpha decay and produced uranium-235.

Nuclear equation:

²³⁹₉₄Pu    →   ²³⁵₉₂U + ⁴₂He

Alpha decay:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom the starting atom.

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Answer:

[tex]235 \atop 92} \right.[/tex] U.

Explanation:

Answer:

Explanation:

Bio preffix means life. Thus, literally, biodiversity means how diverse is the life. This is, how many different organisms an ecosystem or biome has.

Thus, biodiverstiy, although more complex than just that, is a measure of the number of species that live in a region.

The biome with most species than any other, this is the biome with the greatest biodiversity, is the tropical rainforest biome, which are located near the equator. As you can imagine, a large number of different plants, animals, and microorganisms live in these forests, making them the regions with greatest biodiversity on the planet.

Answer:

Cost of the distribution network  

Explanation:

The cost of building a distribution network is the major concern. Each refill station costs about $1.5 million.

A is wrong. Hydrogen comes from water, which is plentiful in the oceans. When hydrogen reacts in the fuel cell, the water is re-formed

C is wrong. The fuel cell will last for about 300 000 km.

D is wrong. Although hydrogen can be produced from petroleum, water is the most likely source.

Answer:

B. Cost of the distribution network

Explanation:

Answer: The new penny is not pure copper

Explanation:

Density [tex]\rho[/tex] is defined as a relation between the mass [tex]m[/tex] and the volume [tex]V[/tex]:

[tex]\rho=\frac{m}{V}[/tex]

Now, we are told the density of pure copper is:

[tex]\rho_{copper}=8.96 g/cm^{3}[/tex]

And we are given the mass and volume of the new penny, with which we can calculate its density:

[tex]\rho_{penny}=\frac{m_{penny}}{V_{penny}}=\frac{2.49 g}{0.349 cm^{3}} [/tex]

[tex]\rho_{penny}=7.13 g/cm^{3}[/tex] As we can see the density of this penny is not equal to the density of pure copper, hence the new penny is not pure copper.

Answer:

                       V₂ = 106.33 ml

Explanation:

Data Given:

                 Initial Temperature  =  T₁  =  27 °C + 273.15 = 300.15 K

                 Initial Pressure  =  P₁  =  740 mmHg

                 Initial Volume  =  V₁  =  120 ml

                 Final Temperature  =  T₂  =  0 °C + 273.15 = 273.15 K

                 Final Pressure  =  P₂  =  760 mmHg

                 Fnal Volume  =  V₂  =  ?

Formula Used:

Let's assume that the Oxygen gas is acting as an Ideal gas, the according to Ideal Gas Equation,

                       P₁ V₁ / T₁  =  P₂ V₂ / T₂

Solving for V₂,

                       V₂ = P₁ V₁ T₂/ T₁ P₂

Putting values,

                       V₂ = 740 mmHg × 120 ml × 273.15 K / 300.15 K × 760 mmHg

                       V₂ = 106.33 ml

The volume of dry oxygen gas at STP is approximately 95.3 mL.

To find the volume of dry oxygen gas at STP (Standard Temperature and Pressure), we will follow these steps:

First, we need to calculate the partial pressure of the dry oxygen. The total pressure (740 mmHg) includes the vapor pressure of water at 27°C, which is 26.7 mmHg.

Subtract the vapor pressure of water from the total pressure to find the pressure of the dry gas:

Pdry gas = Ptotal - Pwater vapor

Pdry gas = 740 mmHg - 26.7 mmHg = 713.3 mmHg

Use the Ideal Gas Law to convert the volume of dry gas to STP conditions.

Remember that STP is 0°C (273.15 K) and 1 atm (760 mmHg).

Using the combined gas law: (P₁ * V₁ / T₁) = (P₂ * V₂ / T₂)

V₂ = (P₁ * V₁ * T₂) / (P₂ * T₁)

Insert the values: P₁ = 713.3 mmHg, V₁ = 120 mL, T₁ = 300.15 K (27°C + 273.15), P₂ = 760 mmHg, T₂ = 273.15 K

[tex]V_2 = \frac{713.3 \, \text{mmHg} \times 120 \, \text{mL} \times 273.15 \, \text{K}}{760 \, \text{mmHg} \times 300.15 \, \text{K}}[/tex]

V₂ ≈ 95.3 mL

Therefore, the volume of the dry oxygen gas at STP is approximately 95.3 mL.

Answer:

the answer to this question if dealing with biology should be;

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation:

this is due to the way scientists tend to write traits. this is the likely result of the box method of doing so

Ww is an example of a Heterozygous allele

WW is an example of a Homozygous Dominant allele

ww is an example of a Homozygous recessive allele

Explanation: This is due to the way scientists tend to write traits. this is the likely result of the box method.

Answer:

              Option-B (Table Salt) is the correct answer.

Explanation:

                     Salt formation takes place when Metal (like Na) and Non-metals (like Cl₂) are reacted. In given statement the reaction will be as follow:

                                        2 Na + Cl₂   →   2 NaCl

Above reaction can be divided as;

Oxidation Reaction:

The Sodium Atom (Na) being metal loses its single valence electron to attain a stable noble gas configuration as,

                                           Na  →  Na⁺  +  1 e⁻

Reduction Reaction:

The Chlorine Atom being non-metals accepts the electron from Na atom and changes into Chloride ion as,

                                          Cl₂  +  2 e⁻   →    2 Cl⁻

Formation of Salt:

Hence, the Na⁺ and Cl⁻ formed attracts each other and form an Ionic bond as,

                                            Na⁺  +  Cl⁻    →     NaCl

Note: You should remember that NaCl (Sodium Chloride) is also known as Table Salt :)

Final answer:

When sodium (Na) reacts with chlorine (Cl₂), the compound formed is table salt (option B), or sodium chloride (NaCl). The reaction is a synthesis of two reactive elements creating an ionic bond to form a stable, commonly used condiment and preservative.

Explanation:

The compound that is formed when the soft putty-like metal sodium (Na) reacts with the green-colored poisonous gas chlorine (Cl₂) is table salt (option B), which is chemically known as sodium chloride (NaCl). The reaction can be represented by the equation:

2 Na(s) + Cl₂ (g) → 2 NaCl(s)

This chemical reaction involves a transfer of electrons from sodium to chlorine, resulting in the formation of Na⁺ ions and Cl⁻ ions, which bond together to form the ionic compound sodium chloride. Sodium is a very reactive metal and chlorine is a correxive gas that should not be inhaled, but when these two are combined, a stable and harmless compound, table salt, is produced.

Answer:

A solution is made by dissolving 4.87 g of potassium nitrate in water to a final volume of 86.4 mL solution. The weight/weight % or percent by mass of the solute is :

2.67%

Explanation:

Note : Look at the density of potassium nitrate in water if given in the question.

You are calculating weight /Volume not weight/weight % or percent by mass of the solute

Here the weight/weight % or percent by mass of the solute is asked : So first convert the VOLUME OF SOLUTION into MASS

Density of potassium nitrate in water KNO3 = 2.11 g/mL

[tex]density=\frac{mass}{volume}[/tex]

Density = 2.11 g/mL

Volume of solution = 86.4 mL

[tex]2.11=\frac{mass}{86.4}[/tex]

[tex]mass = 2.11\times 86.4[/tex]

[tex]mass=182.3grams[/tex]

Mass of Solute = 4.87 g

Mass of Solution = 183.2 g

w/w% of the solute =

[tex]= \frac{mass\ of\ solute}{mass\ of\ solution}\times 100[/tex]

[tex]=\frac{4.87}{183.2}\times 100[/tex]

w/w%=2.67%

Answer:

it's 5.63. I guess you don't round your answer.

Explanation:

Answer:

21.4 ×10²³ particles

Explanation:

Given data:

Number of moles of aluminium sulfate = 3.55

Number of particles = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

1.008 g of hydrogen = 1 mole = 6.022 × 10²³ atoms of hydrogen

For 3.55 moles of aluminium sulfate:

3.55 mol × 6.022×10²³ particles / 1 mol

21.4 ×10²³ particles

Protostars are less dense than other stars.  

Explanation:

Protostars are very young ‘stars’ made from hydrogen clouds that are beginning to coalesce and collapse under their weight. The hydrogen has not even begun fusing. Therefore, they are mainly made of hydrogen which is the lightest element in the universe.

Stars, however, have begun fusing hydrogen to other heavier elements like helium, carbon, oxygen, and iron. The elements are much heavier than hydrogen making other stars much denser than protostars.

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Answer:

it could be industrial

Final answer:

Wastewater can be broadly categorized into household and industrial types. Household wastewater consists of greywater and blackwater from domestic activities, while industrial wastewater includes waste from various industries, potentially containing a range of contaminants that require specialized treatment processes.

Explanation:

You can find two types of wastewater: household and industrial wastewater.

Types of Wastewater:

Wastewater includes both sewage as well as water used in various processes. It comes from a variety of sources, and the two main categories are:

Wastewater Treatment:

Wastewater treatment plants process wastewater through three phases:

The aim of these treatments is to reduce pollutants and solids, thereby lessening the environmental impact when the treated water is released back into ecosystems or reused for irrigation and other non-potable purposes.

To calculate the density of the cube, we first determined the cube's volume by cubing the side's length and then divided the mass by the volume, resulting in a density of 6.179 g/cm³.

To find the density of the cube, we need to use the formula:

Density = mass/volume.

The mass of the cube is given as 0.92 grams. To calculate the volume of the cube, we cube the length of one side:

Volume = side3 = 0.53 cm x 0.53 cm x 0.53 cm.

Volume = 0.148877 cm3 (rounded to six decimal places).

Now, we can calculate the density:

Density = 0.92 g / 0.148877 cm3

Density = 6.179 g/cm3 (rounded to three decimal places).

Therefore, the density of the cube is 6.179 g/cm3.

Answer:

The bucket with 50 degrees Celsius because it is more compact energy moving around faster in a smaller space, while the water in the bathtub is colder so it is moving slower but it also has more space so the protons don't bounce off of each other or the walls as much.

Explanation:

The bucket of water at 50°C would feel warmer to the touch. However, the bathtub filled with water at 25°C contains more energy due to its larger mass.

To determine which would feel warmer to the touch, we need to consider the temperature difference between the object and our body. The bucket of water at 50°C would feel warmer because it has a higher temperature compared to our body temperature. In terms of energy, the bathtub filled with water at 25°C contains more energy because it has a larger mass.

Heat energy is given by the formula Q = mcΔT, where Q represents heat energy, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature. Since the bathtub contains more water and has a larger mass than the bucket, it has more energy.

Therefore, while the bucket of water would feel warmer to the touch, the bathtub contains more energy due to its larger mass.

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The law of conservation of matter, a key principle in chemistry, dictates that the total mass of reactants equals the total mass of products in a chemical reaction. It's applied by balancing chemical equations so that the number of atoms of each element remains constant before and after the reaction. Balancing in terms of moles also reflects this law, ensuring the same amount of each element is present throughout the reaction.

The law of conservation of matter is a fundamental principle in chemistry, stating that matter is neither created nor destroyed during a chemical reaction. In other words, the total mass of the reactants must be equal to the total mass of the products. This law is applied when balancing chemical equations, ensuring that there is the same number of each type of atom on both the reactant and product sides of the equation.

To illustrate, consider a simple chemical reaction where hydrogen gas reacts with oxygen gas to form water:
2 H₂ (g) + O₂ (g) -> 2 H₂O (l).
Balancing this equation, we ensure that there are four hydrogen atoms and two oxygen atoms on both sides, reflecting the conservation of matter. No matter is lost or gained in the process; it is simply rearranged into a different form.

When dealing with stoichiometry and balancing chemical equations in terms of moles, the same principle applies. The number of moles of each element must be conserved across the reaction. This means that for a reaction balanced in moles, the total number of moles of each element in the reactants will equal the total number of moles of each element in the products, satisfying the law of conservation of matter.

Answer: 100kPa

Explanation:

P1 = 3.00 x 10² kPa , P2 =?

T1 = 30°C = 30 +273 = 303k

T2 = —172°C = —172 + 273 = 101k

P1/T1 = P2/T2

3 x 10² / 303 = P2 / 101

P2 = (3 x 10² / 303) x 101

P2 = 100kPa

Final answer:

The final pressure in the container when the temperature is lowered to -172°C is calculated using Gay-Lussac's Law. By converting temperatures to kelvin and applying the formula P2 = (P1 x T2) / T1, we find the final pressure to be approximately 99.5 kPa.

Explanation:

The question is related to the behavior of gases under changes in temperature, which can be described by the Gas Laws, specifically the Gay-Lussac's Law. According to Gay-Lussac's Law, the pressure of a gas is directly proportional to its temperature in kelvins, provided that the volume and amount of gas remain constant. The law can be expressed as P1/T1 = P2/T2, where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

To solve the problem, first convert the initial and final temperatures from Celsius to Kelvin:

Now using Gay-Lussac's Law:

The formula P2 = (P1 x T2) / T1 will give us the final pressure P2.

Substituting the known values:

P2 = (3.00 x 10² kPa x 101.15 K) / 303.15 K =approx 99.5 kPa

Therefore, the final pressure in the container will be approximately 99.5 kPa when the temperature is lowered to -172°C.

Answer:

The correct answer is :

b. Single displacement reaction

Explanation:

The single displacement reaction is the one in which the more reactive element substitute other element in a compound generating a new chemical compound.

It follows this kind of reactions :

[tex]A+BC\rightleftharpoons AC+B[/tex]

Now look at the reaction given;

[tex]Fe+Cu(NO_{3})_{2}\rightleftharpoons Fe(NO_{3})_{2}+Cu(s)[/tex]

Here the more reactive element (Fe) displaces the less reactive element [Cu]from the compound[Cu(NO3)2].

Hence Fe substitute Cu from Cu(NO3)2 and form Fe(NO3)2

It is not a double - displacement reaction . Where the elements interchange themselves to form the compound.

[tex]AB+CD\rightleftharpoons AC+BD[/tex]

Final answer:

The reaction Fe (s) + Cu(NO3)2 (aq) → Fe(NO3)2 (aq) + Cu (s) is a single displacement reaction, where Fe displaces Cu to form Fe(NO3)2 and release Cu as a solid.

Explanation:

The reaction shown, Fe (s) + Cu(NO3)2 (aq) → Fe(NO3)2 (aq) + Cu (s), is a type of chemical reaction where iron (Fe) displaces copper (Cu) from its compound to form a new compound, iron nitrate, while copper is released as a solid. This is an example of a single displacement reaction, specifically a metal replacement reaction, because a metal, in this case iron, is replacing another metal, which is copper. The correct answer to the type of reaction shown is single displacement (option b).

Answer: Limestone

Explanation: Limestone contains calcium carbonate which are essential raw materials for the manufacture of cement used in building.

In the given question, the ionic compound used as a building material is limestone. The correct answer is option 2.

Ionic compounds are chemical compounds that are formed by the electrostatic attraction between oppositely charged ions.

Therefore, option 2. Limestone is an ionic compound that is used as a building material.

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Answer:

h The rates of the forward and reverse reaction are equal.

Explanation:

The reaction takes place in a closed container . So both the reactant (NO₂) and product N₂O₄ are present in the reaction container. Under such conditions, the reaction reaches chemical equilibrium. At chemical equilibrium the rates of the forward and reverse reactions are equal. The concentration of the reactants and products remain constant at Chemical Equilbrium.

Answer:

126.18 hr

Explanation:

Data given:

1 mL of water = 20 drops

count rate = 10 drops/s

time in hours for one gallon = ?

Solution:

First we calculate number of mL (milliliter) of water in gallon

As we know

1 gallon = 3785.4 mL

As,

1 galon consist of 3785.4 mL of water, so now we count number of drops that contain 3785.4 mL of water

As we Know 1 mL water contain 20 drops then 3785.4 mL of water contain how many drops:

Apply unity formula

                    1 mL water ≅ 20 drops

                    3785.4 mL water ≅ X drops

Do cross multiplication

                 X drops of water = 20 drops x 3785.4 mL / 1 mL

                 X drops of water = 75708 drops

So, we come to know that one gallon contain 75708 drops of water and we have to calculate the time in hour to count these drops

First we calculate time in seconds

As we Know 10 drops water count in one second then how many seconds it will take to count 75708 drops

Apply unity formula

                    1 second ≅ 10 drops

                    X second ≅ 75708 drops

Do cross multiplication

                 X second  = 1 second x 75708 drops / 10 drops

                 X second = 7570.8 second

So it take 7570.8 second to count 1 gallon water drops

Now convert seconds to hours

As,

60 seconds = 1 hr

7570.8 second  =  7570.8 / 60 = 126.18 hr

So it take 126.18 hr to count 1 gallon water drops.

Final answer:

It will take approximately 2.1 hours to count the number of drops in 1.0 gallons of water, given a counting rate of 10 drops per second.

Explanation:

To determine how long it will take to count the number of drops in 1.0 gallons of water, we need to establish some conversions. First, 1 gallon is equivalent to 3.785 liters, and 1 milliliter is equivalent to 20 drops of water. Given that the counting rate is 10 drops per second, we calculate the time needed as follows:

Convert gallons to milliliters: 1.0 gal = 3.785 L = 3,785 mL

Calculate the total drops of water in the volume: 3,785 mL × 20 drops/mL = 75,700 drops

Determine the time to count the drops: 75,700 drops ÷ 10 drops/s = 7,570 seconds

Convert seconds to hours: 7,570 s ÷ 3,600 s/hour = 2.1025 hours

Therefore, it will take approximately 2.1 hours to count the number of drops in 1.0 gallons of water at a rate of 10 drops per second.

Answer: Protons = 13

Electrons= 10

Neutrons = 14

Explanation: This problem is an ion of Al which has a charge of +3

For this ion the atomic number for Al is 13 and its mass number is 27.

The atomic number indicates the number of protons which is 13. The number of electrons is changed due to loss of electrons since it was ionized. It loses 3 electrons so the total number of electrons is 13-3 = 10.

The number of neutrons can be calculated using

Atomic mass - atomic number

27- 13 = 14 neutrons

Aluminum ion (Al³⁺) has thirteen protons, thirteen protons, and ten electrons.

Aluminum ion (Al³⁺) is formed by the loss of three electrons from the neutral aluminum atom.

The neutral aluminum atom has thirteen protons, thirteen electrons, and thirteen protons.

During the formation of the Aluminum ion (Al³⁺), three electrons are removed from the valence shell of the neutral aluminum atom, leaving it with only ten electrons.

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Answer:

               Mass percent of Mn is 34.76 %

Explanation:

                    Mass percent of an element is the mass of that element divided by the total mass of the elements forming that compound (or molecular mass.

So,

Mass percent of Mn will be given as,

          %Mn  =  Atomic Mass of Mn / Molecular Mass of KMnO₄ × 100

So,

Atomic Mass of Mn  =  54.94 g/mol

Molecular Mass of KMnO4  =  158.034 g/mol

Putting values in above formula,

          %Mn  =  54.94 g/mol ÷ 158.034 g/mol × 100

          %Mn  = 34.76 %

Answer:

16

Explanation:

FIRST AND FOREMOST, BALANCE YOUR EQUATION.

Al + S8 ➡️ Al2S3

Numbers of Al=1. ➡️ Numbers of Al = 2

Numbers of S =8. ➡️ Numbers of S. = 3

USE COEFFICIENT TO BALANCE THE EQUATION.

16Al + 3S8 ➡️ 8Al2S3

Now the Numbers of Al and S in both sides of eqn. is balanced

The Answer Is 16

Answer: 16 Al

Explanation: If we balance the chemical equation the result is this:

16 Al + 3 S8 => 8Al2S3

Sulfur both have 24 electrons in the reactant and product side

While for Al contains 16 on both sides.

The mass of the salt is 8.00 grams.

To find the mass of the salt, we need to know the molar mass of NaCl. The molar mass of NaCl is calculated by adding the atomic mass of sodium (Na) to the atomic mass of chlorine (Cl). The atomic masses of Na and Cl are 22.99 grams/mole and 35.45 grams/mole, respectively. Adding these two values, we get a molar mass of 58.44 grams/mole for NaCl.

Now, we can use the given number of molecules (8.24 x 10^22) to calculate the mass of the salt. To do this, we first need to convert the number of molecules to moles by dividing it by Avogadro's number (6.02 x 10^23 molecules/mole). So, the number of moles of NaCl is 8.24 x 10^22 / 6.02 x 10^23 = 0.1368 moles.

Finally, we can calculate the mass of the salt by multiplying the number of moles (0.1368) by the molar mass of NaCl (58.44 grams/mole). The mass of the salt is therefore 0.1368 moles x 58.44 grams/mole = 8.00 grams.

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Answer:

5.41 x 10²² g

Explanation:

Data Given:

no. of moles of sodium = 2.35 x 10²¹ moles

mass of sodium = ?

Solution:

Formula used

         no. of moles = mass in grams / molar mass

To find mass rearrange the above equation:

   mass in grams = no. of moles x molar mass. . . . . . (1)

Put values in equation 1

          mass in grams = 2.35 x 10²¹ moles x 23 g/mol

          mass in grams =  5.41 x 10²² g

So,

mass of Sodium (Na) =  5.41 x 10²² g

Answer:

             The correct Option is C (It is polar, because the bond polarities add together in a bent  molecule.)

Explanation:

The molecular structure of Hydrogen Sulfide (H₂S) is attached below;

The molecule of Hydrogen Sulfide is polar due to following two reasons;

1)  Electronegativity Difference:

                                                   Sulfur has an electronegativity of 2.58 while that of Hydrogen is 2.20. Hence, sulfur being more electronegative attracts the electron fro hydrogen making it slightly partial positive and increasing electron density and becoming slightly partially positive. So, we can call this bond as slightly polar bond.

2) Dipole Moment:

                             Dipole moment occurs when the bond is polar. Being a vector quantity it strongly depends upon the geometry of a molecule. In H₂S the two polar bonds cannot cancel each other because they are not in opposite direction  as that found in case of CO₂. Hence, H₂S is a polar compound.

Hydrogen sulfide (H2S) is polar due to the differences in electronegativity between hydrogen and sulfur and its bent molecular shape, which prevent the bond polarities from canceling each other out.

The correct option is C, 'H2S is polar because the bond polarities add together in a bent molecule'. The molecule hydrogen sulfide (H2S) is indeed polar. This is due to the fact that sulfur is more electronegative than hydrogen, creating a dipole moment in the bond. As the molecule is not symmetric, the polarities do not cancel out, making the molecule overall polar. In geometrical terms, the H2S molecule forms a 'bent' or 'V' shape, similar to water (H2O).

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Answer:

87.5

Explanation:

1300-950=350

350/4 =87.5

The difference between 1300 and 950 is 350. When you divide this difference by 4, you find that the answer is 87.5.

In this mathematics problem, you are tasked with finding the difference between two numbers: one thousand three hundred (1300) and nine hundred fifty (950). The difference between these two numbers is 350. The next step as described in the question is to divide this difference by 4. So, 350 divided by 4 equals 87.5. Therefore, the solution to this problem is 87.5.

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Answer:

Round

Explanation:

There are 126,720 inches in 2.0 miles, calculated by multiplying the number of miles (2.0) by 63,360 inches per mile.

The student asked, "How many inches are in 2.0 miles?" To answer this question, we need to use a direct conversion factor. There are 63,360 inches in a mile because there are 5,280 feet in a mile and each foot has 12 inches. Therefore, to convert miles to inches, you can multiply the number of miles by 63,360.

For 2.0 miles, the calculation would be:

So, there are 126,720 inches in 2.0 miles.