Consider the nuclear equation below.

Superscript 239 subscript 94 upper P u right arrow variable X plus superscript 4 subscript 2 upper H e.

What is X?

Answer:

Percent yield = 63.3%

Explanation:

Given data:

Mass of copper = 32.89 g

Mass of oxygen = 32.89 g

Mass of copper(II) oxide formed = 26.20 g

Mass of calcium chloride produced = ?

Solution:

The actual yield of reaction is the amount that you have recovered such as 26.20 g.

Theoretical yield will be calculated in the following way,

Chemical equation:

2Cu + O₂  →  2CuO

Number of moles of Cu:

Number of moles  = Mass /molar mass

Number of moles = 32.89 g / 63.55 g/mol

Number of moles = 0.52 mol

Number of moles of  O₂:

Number of moles = Mass /molar mass

Number of moles  = 32.89 g / 32 g/mol

Number of moles = 1.03 mol

Now we will compare the moles of CuO with Cu and O₂.

                  O₂           :               CuO

                  1               :               2

                 1.03           :            2.06

                Cu              :                CuO  

                 2                :                 2

                  0.52           :             0.52

The number of moles of CuO produced by Cu are less so it will limiting reactant.

Mass of CuO: (THEORETICAL YIELD)

Mass = number of moles × molar mass

Mass = 0.52 mol × 79.55 g/mol

Mass = 41.4 g

Percent yield:

Percent yield = actual yield /  theoretical yield  × 100

Percent yield = 26.20 g/ 41.4 g × 100

Percent yield = 63.3%

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:

                       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.

Explanation:

This uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary. The other process proposed to contribute to the formation of new oceanic crust at mid-ocean ridges is the "mantle conveyor".

Mid-ocean ridges and ocean trenches has been result in the cycling of matter with the movement of tectonic plates.

Cycling of matter has been defined as the transfer of matter from one place to another. The transfer of matter has been achieved within the ecosystem.

The mid-ocean ridges have been present in the part of the divergent plate boundaries. The ocean trenches have been the convergence of the tectonic plates.

The convergence and divergence of the tectonic plates results in the transfer of matter from one place to another. Thus, mid-ocean ridges and ocean trenches has been result in the cycling of matter with the movement of tectonic plates.

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Answer:

. Physical change because compressibility is a physical property.

Explanation:

I took a test with this in it and this was right.

Answer:

C

Explanation:

the answer is c because compressibility is a physical property

Explanation:

Chemical reaction

When two or more substances react and form some new substance it is called as chemical reaction .

There are so many reactions , out of which decomposition is also one type .

It is explained below :

Decomposition reaction

it is the type in which a reactant breaks up into its constituents  either by heating or passing current or in presence of light .

That is :  

(a) Photo decomposition (breaking in presence of light )  

Examples AgCl-----Ag+Cl₂

                (white )  (grey )

(B)Electrolytic decomposition : breaking by passing current  

Example : NaCl------Na+Cl₂

©Thermal decomposition : breaking by heating )

Example : Pb(No₃)₂-----PbO+NO₂+O₂

                                                                          (reddish brown gas )

ACTIVITY TO DEMONSTRATE : heating of ferrous sulphate  

FeSO₄.7H2O------FeSO₄+7H₂O

(GREEN )

FeSO₄-----------------heat -------Fe₂O₃+SO₂+SO₃

This question is done considering : Identify the type of reaction

2 Pb(NO3)2 – 2 PbO + 4 NO2 + O2

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.

Explanation:

Sodium has lower electronegativity value and a largest atom as compared to given element whereas beryllium has least metallic character.

The element Sodium (Na) has a low electronegativity as compared to other given elements. The electronegativity values of sodium is 0.93, beryllium has 1.57, magnesium has 1.31 and lithium has 0.98 so we can say that sodium has lower electronegativity value.

The element Beryllium (Be) has the least metallic character because beryllium is present at the top of the periodic table. When we go from top to bottom metallic character increases and decreases from left to right in the periodic table.

The element Sodium (Na) has the largest atom among these elements because of more number of shells added when we go from top to bottom which make higher the radius of sodium as well as size so we can conclude that sodium has lower electronegativity value and a largest atom as compared to given element whereas beryllium has least metallic character.

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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: Internal fertilization

Explanation: Most birds and reptiles undergoes internal fertilization in which the sperm cells are ejected and fertilizes the egg cell inside the body of the animal.

Birds and many reptiles undergo oviparity, where internal fertilization leads to the laying of hard-shelled eggs that develop outside the parent's body. The calcified eggshell provides protection and the amniotic cavity within offers a stable environment for the embryo. This adaptation facilitates thriving in diverse, often drier habitats.

Birds and many reptiles exhibit a type of fertilization and development known as oviparity. In this process, internal fertilization occurs within the parent's body, but the offspring develop outside of the parent's body. The fertilized eggs are laid by the female, and the embryo develops receiving nourishment from the egg's yolk within an eggshell enriched with calcium carbonate, which makes the shell hard. An example of an oviparous animal is the chicken, whose eggs we are commonly familiar with. This mechanism provides protection to the embryos and has allowed these species to thrive in various environments, leading to less dependence on water for the development of the young.

Reptiles and birds possess four extraembryonic membranes: the yolk sac, the amnion, the chorion, and the allantois. The amnion creates an aquatic environment for the embryo, which is significant for their terrestrial lifestyle. Through oviparity, reptiles and birds have adapted to drier environments, an evolutionary advantage over their amphibian relatives.

Answer:

molecules

Explanation:

Data Given:

mass of aspartame = 10 g

molecules of aspartame = ?

Solution

First we calculate no. of moles of 10 g aspartame

For which mole formula will be used

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

Formula of aspartame:

C₁₄H₁₈N₂O₅

So,

The molar mass of aspartame (C₁₄H₁₈N₂O₅) will be

molar mass of C₁₄H₁₈N₂O₅ = 14(12) + 18(1) + 2(14) +5(16)

molar mass of C₁₄H₁₈N₂O₅ = 168 + 18+ 28 + 80

molar mass of C₁₄H₁₈N₂O₅ = 294 g/mol

put values in equation 1

          no. of moles = 10 g / 294 g/mol

          no. of moles = 0.034 mol

now we will calculate no. of molecules

Formula will be used

           no. of moles = no. of molecules / Avogadro's number

Rearrange the above equation:

no. of molecules = no. of moles x Avogadro's number . . . . . (2)

Where

Avogadro's number = 6.022 x 10²³

Put values in equation 2

           no. of molecules =0.034 mol x 6.022 x 10²³ (molecules/mol)

           no. of molecules = 2.0475 x 10²²

So,

There are 2.0475 x 10²² molecules are in 10 grams of aspartame that is 0.034 moles of aspartame.

So,  in turn its 0.034 moles of molecules are in 10 g of aspartame.

The moles of molecules are in 10 g of aspartame - 0.034 × 10¹⁹

The number of molecules of a given mass of a substance using the molar mass of the substance and Avogadro's constant, 6.022 × 10²³

The number of moles = [tex]mass\ of\ the\ substance * \frac{1}{molecular\ mass}[/tex]

= [tex]\frac{10}{294}[/tex]

= 0.034 × 10 ⁻⁵ mole

Using Avogadro's constant, we can convert this value to molecules as so:

= 0.034 × 10 ⁻⁵ (6.022 × 10²³)

= 0.034 × 10¹⁹

Thus, the moles of molecules are in 10 g of aspartame - 0.034 × 10¹⁹

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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:

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.

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: 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.

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:

0.074

Explanation:

15% means that in 100 g of solution 15 g sodium hydroxide is present.

Mass of water = 100 - 15 = 85 g

Number of moles of sodium hydroxide:

Number of moles = 15 g/40 g/mol

Number of moles = 0.375 mol

Number of moles of water:

Number of moles = 85 g/18 g/mol

Number of moles = 4.7 mol

Moles fraction of NaOH:

moles of NaOH/ moles of solvent + moles of solute

0.375 mol/ 0.375 mol+4.7mol

0.375 mol / 5.075 mol

0.074

Answer:

tin (Sn) have larger volume than titanium (Ti)

Explanation:

Data Given:

larger volume of titanium or tin?

Solution:

First we will find volume for each element.

To calculate volume of Titanium (Ti):

formula used

      d = m/v

Rearrange the above formula for volume

       v = m/d . .. . . .(1)

Where

v= volume

d= density

m= mass

As Reported

Mass of Titanium = 48 g/mol

density of  Titanium = 4.506 g/cm³

Put values in above equation 1

        v = 48 g/mol / 4.506 g/cm³

        v = 10.65 cm³/mol

volume of 1 mole Titanium 10.65 cm³

_______

Now we will find volume for tin (Sn)

To calculate volume of tin (Sn):

formula used

      d = m/v

Rearrange the above formula for volume

       v = m/d . .. . . .(1)

Where

v= volume

d= density

m= mass

As Reported

Mass of Tin= 118.7 g/mol

density of  Tin = 7.31 g/cm³

Put values in above equation 1

        v = 118.7 g/mol / 7.31 g/cm³

        v = 16.24 cm³/mol

volume of 1 mole Tin 16.24 cm³

So,

It is clear that tin (Sn) have larger volume than titanium (Ti)

Answer: 0.2 moles H2O

Explanation: 1 mole of H2O is equal to the molar mass of water

Solution:

3.60 g H2O x 1mol H2O / 18 g H2O

= 0.2 mol H2O

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: 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:

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:

4.27 moles of NaCl

Explanation:

Molar mass of NaCl = 23 + 35.5 = 58.5 g/mol

Number of moles of NaCl(table salt) = 250 grams /58.5 g/mol

= 4.27 moles of NaCl

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:

hu?

Explanation:

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:

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: