The molecule CH20 contains two single bonds and one double bond.
True
False

Answer:

1.26 x 10²³atoms

Explanation:

Given parameters:

Number of moles = 1mol

Unknown:

Number of atoms of sulfur = ?

Solution

From the given parameters, we can find the number of moles of sulfur in the given compound FeSO₄.

We use the formula mass of atoms to find the number of moles:

    Atomic number of Fe = 56g

                                     S = 32g

                                     O = 16g

Formula mass = 56 + 32 + 4(16) = 152

  Number of moles of sulfur = [tex]\frac{32}{152}[/tex] x 1

                                              = 0.21mol

Using the number of moles of sulfur, we can now calculate the number of atoms:

               Number of atoms = number of moles x 6.02 x 10²³

              Number of atoms = 0.21 x 6.02 x 10²³ = 1.26 x 10²³atoms

Final answer:

Approximately 9.32 liters of radon gas would be in 3.43 moles at standard temperature and pressure (273K and 100 kPa).

Explanation:

To find the number of liters of radon gas in 3.43 moles at standard temperature and pressure (STP), we can use the ideal gas law equation: PV = nRT.

Substituting the given values into the equation:

Pressure (P) = 100 kPa

Temperature (T) = 273 K

Number of moles (n) = 3.43 mol

Ideal gas constant (R) = 8.31 L·kPa/mol·K

Volume (V) is what we need to find.

Using the equation PV = nRT, we can rearrange it to solve for the volume:

V = (nRT) / P

Plugging in the values:

V = (3.43 mol)(8.31 L·kPa/mol·K)(273 K) / 100 kPa

V ≈ 9.32 L

Therefore, there would be approximately 9.32 liters of radon gas in 3.43 moles at standard temperature and pressure.

The correct answer is Chemical energy changes to mechanical energy. Chemical energy in the battery powers the mechanical fan. ON USA TEST PREP!!!!!

Answer:

The correct answer is Chemical energy changes to mechanical energy. Chemical energy in the battery powers the mechanical fan.

Explanation:

USA-TestPrep

Answer:

Sulfur

Explanation:

the atomic number is the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table

Sulfur has 16 protons in its nucleus

The element with an atomic number of 16 is sulfur.

Sulfur is a chemical element that has an atomic number of 16. It is represented by the symbol "S" on the periodic table.

Sulfur is a nonmetal and belongs to Group 16, also known as the chalcogens, on the periodic table. It is located in the third period. It is classified as a multivalent element, meaning it can form compounds with various oxidation states.

In its pure form, sulfur is a yellow, brittle solid. It is known for its distinctive odor, often described as being similar to rotten eggs. Sulfur is found in various minerals and is also a component of many natural resources such as coal, petroleum, and natural gas.

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The equilibrium expression for the given reaction 2SO3(g) <=> O2(g) + 2SO2(g) is Ke = [SO₃]² / ([SO₂]² [O₂]).

The equilibrium expression for the given reaction is Ke = [SO₃]² / ([SO₂]² [O₂]).

Ke represents the equilibrium constant, which is a measure of the extent to which a reaction reaches equilibrium. In this case, the equilibrium constant is calculated by taking the square of the concentration of SO₃ and dividing it by the product of the squares of the concentrations of SO₂ and O₂.

For example, if the concentrations at equilibrium are [SO₂] = 0.90 M, [O₂] = 0.35 M, and [SO₃] = 1.1 M, the value of the equilibrium constant, Ke, can be calculated as Ke = (1.1)² / ((0.90)² (0.35)).

Answer:

7 and 11

Explanation:

The amount of sand on the beaches can be found using this formula:

volume (m3) = length (m) × width (m) × depth (m)

(6 × 108 m) × 60 m × 20 m = 7 × 1011 m3

Therefore, there would be a total of 7 × 1011 cubic meters of sand on the beaches.

7 ×[tex]10^{11} m^3[/tex] cubic meters of sand are on the beaches.

Coastal areas are local administrative units (LAUs) that are bordering or close to a coastline.

The amount of sand on the beaches can be found using this formula:

volume = length (m) × width (m) × depth (m)

(6 × [tex]10^{8}[/tex]m) × 60 m × 20 m

= 7 × [tex]10^{11} m^3[/tex]

Therefore, there would be a total of 7 × [tex]10^{11}[/tex]cubic meters of sand on the beaches.

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Answer:

8.38g

Explanation:

Given parameters:

Volume of the gas = 12L or 12dm³

Temperature = 293k

Pressure = 100kPa

Unknown: mass of the ammonia gas = ?

_____ Now let us take the unit of pressure to atm:

    Pressure = 100 kPa

    1kPa = 0.00986923atm

    100kPa = 100 x 0.00986923 = 0.987atm

Solution:

From the ideal gas law, we can find the number of moles of the ammonia gas. Using the number of moles, it would be possible to find the mass of the ammonia.

                  PV = nRT

                    n = [tex]\frac{PV}{RT}[/tex]

Where R is the gas constant and its value is 0.082atmdm³mol⁻¹K⁻¹

      n = [tex]\frac{0.987atm x  12dm³}{0.082atmdm³mol⁻¹K⁻¹ x 293K}[/tex]

     n = 0.493mol

We know that, mass = number of moles x molar mass

Molar mass of NH₃ = 14 + (3x1) = 17gmol⁻¹

                    mass of NH₃ = 0.493 x 17 = 8.38g

Final answer:

Strong and weak acids can both conduct electricity as they act as electrolytes. The difference lies in their ionization levels, determining their strength as electrolytes and affecting conductivity.

Explanation:

What strong and weak acids have in common is their ability to conduct electrical current because they contain dissolved ions in aqueous solutions. Both types of acids are characterized as electrolytes, but they differ in the degree of their electrolytic properties. Strong acids are strong electrolytes and ionize completely in water, resulting in high conductivity. In contrast, weak acids do not ionize completely, existing primarily in a non-ionized form, which makes them weak electrolytes with lower conductivity. To summarize, both strong and weak acids can conduct electricity but differ in their ionization and resulting conductivity levels. Therefore, the answer is 'A. Electrical current conduction.'

Answer:

the answer is letter B. it is  a gas containing nuclei and electrons.

B. It is a gas containing nuclei and electrons.

Plasma is called the fourth state of matter. It is a state of matter in which an ionized substance turns into distinctly electrically conductive to the point that long-range electric and magnetic fields dominate its behavior.

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Answer:

Hydrogen bonding

Explanation:

Hydrogen bonds are special dipole-dipole attraction between polar molecules in which a hydrogen molecule atom is directly joined to a highly electronegative atom.

This type of bond is an intermolecular bond caused by an electrostatic attraction between the hydrogen atom of one molecule and the electronegative atom(O or N or F) of a neighbouring molecule.

Answer:

Hydrogen bonding

Explanation:

Hydrogen bonding is a type of dipole dipole interaction. It exist between H atom bonded to electronegative atom; O, N, F and other O, N, F of another molecule.

Some of the examples of compounds having hydrogen bonding are:

[tex]NH_3,\ H_2O,\ HF,\ CH_3OH,\ etc.[/tex]

Hydrogen bonding exists because of development of dipole dipole interaction between H and electronegative atom.

As H is less electronegative as compared to O, N and F. So partial positive charge develop on H and partial negative chagre develop develop on the attached electronegative atom. Because of development of partial positive and partial negative charge, dipole dipole interaction occurs which leads to the development of hydrogen bonding.

Answer:

*Engineers can design better bridges because they know how metal changes shape.

*Scientists can easily classify mixtures of unknown substances.

Explanation:

Tensile strength and the properties of mixtures are physical properties because the substances are not changed into different ones.

A. and C. are wrong. Combustion and other reactions are chemical properties because the substances are changed into different ones

Answer: *Scientists can easily classify mixtures of unknown substances.

*Engineers can design better bridges because they know how metal changes shape.

*Engineers can design safer structures because they understand the flammability of building materials.

Explanation:

Physical properties of the material can be define as the properties which can be observed or measured without changing the composition of the material. These properties includes texture, odor, color, boiling point, density, polarity, solubility, melting point, and others.

*Scientists can easily classify mixtures of unknown substances. : The mixtures of the metals can be separated by their physical properties such as color, shape and size of the metal particles.

*Engineers can design better bridges because they know how metal changes shape.: The change in shape is a physical property, understanding this property can help the engineers to design the bridges better.

*Engineers can design safer structures because they understand the flammability of building materials. :

Flammability is indicating towards the melting point of the building materials. Thus engineers must design the materials which is safe from flammability and must have a high melting point.  

Answer: During the Freezing stage

Explanation:

Solids are more dense than liquids because their molecules are pressed together.

Answer:

During solid phase change, the arrangement of water molecules become most orderly

Explanation:

Solids have a definite volume and definite shape

The particles present in a solid are very closely packed since the intermolecular forces between them are very strong. The molecules do not move apart.

This strong forces makes the solids to arrange the particles present in them to take up its position in an orderly arrangement in space. Vibrational motion exists among the particles making them not to move from its position.

Thus water molecules have an orderly arrangement in solid Ice rather than in liquid water.

Entropy is the disorderness or randomness of the molecules which are greater in gases > liquid > solid.

Entropy is less in solid due to the strong attractive forces which exist between the particles present in them.

Explanation:

First thing first, you mistyped the specific heat of water, which should be

c

water

=

4.18

J

g

∘

C

Now, a substance's specific heat tells you how much heat is required to increase the temperature of

1 g

of that substance by

1

∘

C

.

In the case of water, you would need

4.18 J

to increase the temperature of

1 g

of water by

1

∘

C

.

Notice that your sample of water has a mass of

1 g

as well, which means that the only factor that will determine the amount of heat needed will be the difference in temperature.

The equation that establishes a relationshop between heat and change in temperature looks like this

q

=

m

⋅

c

⋅

Δ

T

, where

q

- heat absorbed

c

- the specific heat of the substance, in your case of water

Δ

T

- the change in temperature, defined as the difference between the final temperature and the initial temperature

Plug in your values and solve for

q

to get

q

=

1.00

g

⋅

4.18

J

g

⋅

∘

C

⋅

(

83.7

−

26.5

)

∘

C

q

=

239.096 J

Rounded to three sig figs, the answer will be

q

=

239 J

Answer:

C. Oxidation

Explanation:

To make it short

Answer:

The molecular shape Octahedral is the answer of this question

Answer:  Octahedral Geometry

Explanation:  There are two types of pairs of electrons which helps to define a geometry of the molecule. These are bonding pairs and non bonding pairs of electrons. The latter is also known as Lone pair of electrons.

Thus when a central atom is surrounded by 4 bonding pairs of electrons , it will result in tetrahedral geometry.

And when six bonding pairs of electrons are around the central atom then a Octahedral Geometry will be the resultant structure as shown in the diagram.

Answer:

C.)house temperature increases cause the bimetallic coil to expand

Explanation:

A bimetallic strip is used in an air conditioner as a regulator. It is made up of two metals that behaves differently to a change in temperature.

To turn on the air conditoner, the circuit must be complete. When the temperature is high in a room, bimetallic strip responds by expanding and bending to complete the circuit. This puts on the air conditioner and the house begins to cool through exchange of warm and cold air.

When the temperature is too cold, the strip contracts and straightens. This process disconnects the circuit and the air conditioning system ceases to work.

Answer:

Answer choice A

Explanation:

When an electron is transferred to another atom, both atoms involved become ions.

Answer:

[tex]\boxed{\text{10.84}}[/tex]

Explanation:

A solution of a weak base and its conjugate acid is a buffer.

The equation for the equilibrium is

[tex]\rm CH$_3$NH$_2$ + H$_2$O $\, \rightleftharpoons \,$ CH$_3$NH$_2$+ H$_{3}$O$^{+}$\\\text{For ease of typing, let's rewrite this equation as}\\\rm B + H$_2$O $\longrightarrow \,$ BH$^{+}$ + OH$^{-}$; $K_{\text{b}}$ = 4.4 \times 10^{-4}$[/tex]

The Henderson-Hasselbalch equation for a basic buffer is

[tex]\text{pOH} = \text{p}K_{\text{b}} + \log\dfrac{[\text{BH}^{+}]}{\text{[B]}}[/tex]

Data:

   [B] = 0.400 mol·L⁻¹

[BH⁺] = 0.250 mol·L⁻¹

    Kb = 4.4 × 10⁻⁴

Calculations:

(a) Calculate pKb

pKb = -log(4.4× 10⁻⁴)  = 3.36

(b) Calculate the pH

[tex]\text{pOH} = 3.36 + \log \dfrac{0.250}{0.400} = 3.36 + \log 0.625 = 3.36 - 0.204 = 3.16\\\\\text{pH} =14.00 -3.16 = \mathbf{10.84}\\\\\text{The pH of the solution is }\boxed{\textbf{10.84}}[/tex]

The pH of a solution of 0.400 M CH₃NH₂ containing 0.250 M CH₃NH₃I = 10.84

This given solution contains a weak base (CH₃NH₂) and the conjugate acid of that weak base (CH₃NH₃I) which makes a Buffer.

We know that  

[tex]pOH=pK_b+log\frac{[salt]}{[base]}[/tex]

or, [tex]pH=pK_a+log\frac{[base]}{[salt]}[/tex]

CH₃NH₂ is the base and CH₃NH₃I is the corresponding conjugate acid (salt).

Given:

[base] = 0.400 M

[salt] or [acid] = 0.250 M

= 4.4 * 10-4

So = 3.36

solution:

Putting in the equation,

[tex]pOH= 3.36 +log\frac{0.250\ M}{0.400\ M}[/tex]

pOH= 3.16

So pH = 14 - pOH

= 10.84

Thus, the pH of a solution of 0.400 M CH₃NH₂ containing 0.250 M CH₃NH₃I = 10.84

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Answer:

=1.4953 moles

Explanation:

Iron (III) Oxide is reduced by carbon (II) oxide into Iron. According to the following equation, One mole of Fe₂O₃ react with 3 moles of CO to produce  2 moles of Fe. Thus the reaction ratio of CO to Fe₂O₃ is 3:1  

Fe₂O₃₍s₎ + 3CO  → 2Fe₍s₎ + 3CO₂₍g₎

125.6 grams of CO is equivalent to: 125.6g/28.0g/mol

=4.486 moles.

The number of moles of Fe produced by the reaction is:

=(4.486 moles×1)/3

=1.4953 moles

(i) We start by calculating the mass of sugar in the solution:

mass of sugar = concentration × solution mass

mass of sugar = 2.5/100 × 500 = 12.5 g  

Then now we can calculate the amount of water:

solution mass = mass of sugar + mass of water

mass of water =  solution mass - mass of sugar

mass of water = 500 - 12.5 = 487.5 g

(ii) We use the following reasoning:

If       500 g solution contains 12.5 g sugar

Then    X g solution contains 75 g sugar

X=(500×75)/12.5 = 3000 g solution

Now to get the amount of solution in liters we use density (we assume that is equal to 1):

Density = mass / volume

Volume = mass / density

Volume = 3000 / 1 = 3000 liters of sugar solution

To prepare 500g of a 2.5% sugar solution, 487.5g of water is required. To get 75g of sugar from the solution, 3 liters of the solution are needed.

In a 2.5% solution of sugar, 2.5g of sugar are present in 100g of solution. To prepare a 500g solution, you need to calculate the amount of water to be added to the given weight of sugar. We start by deducing that a 500g sugar solution requires 12.5g of sugar (since 2.5% of 500g equals 12.5g). Therefore, the amount of water needed is 487.5g (by deducting 12.5g of sugar from 500g of solution).

For the second part of your question, if we want to get 75g of sugar and we know we get 2.5g of sugar from 100g of solution, we can deduce that it will take 3000g (or 3 litres) of the (Mass/volume) sugar solution to get 75g of sugar (since 75 divided by 2.5 equals 30, so 30 times 100 equals 3000).

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Methane CH[tex]_{4}[/tex] does not have ionic bonds. Because of the close value of electronegativity of the carbon and hydrogen atoms the electrons are shared forming covalent bonds.

Answer:

[tex]CH_4[/tex]  is not likely to have ionic bonds

Explanation:

Ionic bond is formed between a metal and a non metal.

[tex]NaCl, LiF[/tex] and [tex]MgF_2[/tex] are examples in which we see metal bonded with a non-metal.

Na, Li, Mg are all metals and Cl, F are non metals.

[tex]CH_4[/tex] contains only non metals. Covalent bond is the bond present among non metallic compounds.

We can identify a bond as an ionic bond or a covalent bond based on the electronegativity values of the atoms present in it.

For example [tex]H_2 S[/tex]

Hydrogen --> electronegativity value is 2.1

Sulfur --> electronegativity value is 2.5

∆E, the electronegativity difference is 2.5 - 2.1 = 0.4

So, It is a non polar covalent bond present in [tex]H_2 S[/tex]

Examples :  

The electronegative values of H is 2.1

F is 4.0

O is 3.5  

N is 3.0

∆E value of HF Hydrogen bond  is

4.0 - 2.1 = 1.9

∆E value of H2O Hydrogen bond is

3.5 - 2.1 = 1.4

∆E value of NH3 Hydrogen bond is

3.0 - 2.1 = 0.9

∆E value between 0.5 to 1.7 is a polar covalent bond

∆E value btween 0 to 0.4 is a non polar covalent bond  

∆E above 1.7 is an ionic bond

Answer:

A

Explanation:

People engineered things to help with irrigation to bring water to crops(food)

Answer:

A

Explanation:

engineering has to do with creating something, and A is the only option of that kind. process of elimination

Answer:

Soil

Explanation:

Plants(a.k.a. Producers) obtain nitrogen(N) from the soil by absorption through their roots.

Answer:

D

Explanation:

(a) The nucleus has most of the mass and comprises most of the volume of an atom;  false

The nucleus has most of the mass but the volume of an atom is depends on the distance between the nucleus and the position of the electrons.

(b) Every atom of a  given element has the same number of protons;  true

They may have different number of neutrons and so you have isotopes but the number of protons remain the same for a given element.  

(c) The  number of electrons in an atom equals the number of  neutrons in the atom; false

The  number of electrons in an atom equals the number of  protons in the atom.

The electrons are negatively charged which compensate the positively charged protons not the neutrons which do not have a charge (they are neutral).

(d) The protons in the nucleus of  the helium atom are held together by a force called the  strong nuclear force. true

Answer:

(a) False

(b) True

(c) False

(d) True

Explanation:

Option A is false. The nucleus has most of the mass in a small volume thus making it very dense. But the volume is given by the atomic radius that is the distance between the center of the nucleus and the electrons in different atomic orbitals.  

Option B is true. Every atom of an element has the same atomic number. Atomic number is the total number of protons in an atom.  

Option C is false. In a neutral atom the number of electrons is equal to the number of protons. Neutrons are neutral in charge.  

Option D is true. All protons are positively charged and similar charges repel each other with electrostatic forces of repulsion but the nuclear forces overcome the repulsive forces and stabilize the protons in the nucleus of the atom.  

The mineral composition of a rock determines its properties.

The mineral composition of a rock determines its properties. Rocks are made up of different combinations of minerals or sometimes just one mineral. For example, a rock called granite is made up of a combination of minerals such as quartz, feldspar, and mica. The mineral composition of a rock can be observed and analyzed to understand its characteristics.

Answer:

Choice B. The solid with hydrogen bonding.

Assumption: the molecules in the four choices are of similar sizes.

Explanation:

Molecules in a molecular solid are held intact with intermolecular forces. To melt the solid, it is necessary to overcome these forces. The stronger the intermolecular forces, the more energy will be required to overcome these attractions and melt the solid. That corresponds to a high melting point.

For molecules of similar sizes,

That is:

Strength of Hydrogen bond > Strength of Dipole-dipole attractions > Strength of Induced dipole attractions.

Accordingly,

Melting point due to Hydrogen bond > Melting point due to Dipole-dipole attractions > Melting point due to Induced Dipole attractions.

As a result, induced dipoles are the only force possible between molecules of the solid in choice C. Assume that the molecules are of similar sizes, such that the strengths of induced dipole are similar for these molecules.

Melting point in choice B > Melting point in choice D > Melting point in choice A and C.

Answer:

B. One that has hydrogen bonding

Answer:

XY → X + Y general reaction represents a decomposition reaction where a molecule is “broken” in two separate molecules

Explanation:

In a double-displacement reaction two molecules will exchange atoms or group of atoms, and it should look like this:

XY + AB →  XA + YB

In a combustion reaction molecules are reacting with oxygen generating oxides.  

XY + O[tex]_{2}[/tex] → XO + YO

In a single-displacement reaction an atom or a group of atoms in a molecule are replaced by other atoms, and it should look like this:

XY + A → XA + Y

The equation represents a Decomposition reaction, where a single compound breaks down into two or more elements or compounds.

The general equation XY → X+Y represents a type of chemical reaction known as a Decomposition reaction. A Decomposition reaction is a type of reaction in which a single compound breaks down into two or more elements or new compounds. This reaction is the exact opposite of a synthesis, or combination, reaction. It typically occurs when a compound is heated or subjected to an electric current. In the given equation XY → X+Y, a compound 'XY' is decomposing into its constituent elements 'X' and 'Y'.

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Answer:

The large landmass was named Pangea

Answer:

The names of all continents is Pangaea given by Alfred Wegener in 1912

Explanation:

The name Pangaea or Pangea is derived from the Greek pan that in english means Whole and Gaia that in english means Land. The idea was not new because before Wegener, other scientist have proposed the idea of a huge landmass and then the separation by continents. but Wegener was the first to use the term continental drift.

The continental drift means that the continents are moving form each other since millions of years due to the mantle convection. This theory has been replaced by tectonic plate theory.

Answer:

42.65g

Explanation:

Given parameters:

Mass of K = 4g

Unknown: Mass of KCl

Solution:

  Complete equation of the reaction:

              2K + Cl₂ → 2KCl

To solve this problem, we know that the reactant in short supply is potassium K and this dictates the amount of products that would be formed. The chlorine gas is in excess and we can't use it to determine the amount of product that would form.

Now, we work from the known to the unknown. Since we know the mass of K given in the reaction, we can simply find the molar relationship between the reacting potassium and the product. We simply convert the mass to mole and compare to the product. From there we can find the mass of KCl that would be produced.

Calculating number of moles of K

      Number of moles = [tex]\frac{mass}{molar mass}[/tex]

        Number of moles of K =  [tex]\frac{4}{39}[/tex] = 0.103mol

From the given reaction equation:

   2 moles of K will produce 2 moles of KCl

 Therefore 0.103mol of K will produce 0.103mol of KCl

To find the mass of KCl produced,

   Mass of KCl = number of moles of KCl x molar mass

Molar mass of KCl = 39 + 35.5 = 74.5gmol⁻¹

Mass of KCl = 0.103 x 74.5 = 42.65g

Answer:

Grams of KCl produced = 7.60 g

Explanation:

The given reaction is:

2K + Cl2 → 2KCl

It is given that Cl2 is in excess which implies that potassium K is the limiting reagent

Based on the reaction stoichiometry:

2 moles of K produces 2 moles of KCl i.e the molar ratio of K:KCl = 1:1

[tex]Moles(K)= \frac{Mass}{Atomic mass}=\frac{4.00g}{39.09g/mol}=0.102moles[/tex]

Therefore, moles of KCl produced = 0.102

[tex]Mass(KCl)=moles*mol.wt = 0.102moles*74.55g/mol=7.60g[/tex]

Answer:

Explanation:

The half reactions are:

         Mg[tex]_{s}[/tex] → Mg²⁺[tex]_{aq}[/tex] + 2e⁻

        2H⁺[tex]_{aq}[/tex]  + 2e⁻ →  H₂[tex]_{g}[/tex]

The first equation is an oxidation half while the second is a reduction half. To get the overall reaction equation, we simply combine the two equations. The reactants combines at the left hand side with the products comes together at the right hand side.

Mg[tex]_{s}[/tex] +  2H⁺[tex]_{aq}[/tex]  + 2e⁻  → Mg²⁺[tex]_{aq}[/tex] + 2e⁻ +  H₂[tex]_{g}[/tex]

Now we cancel out the species that appear on both sides:

Mg[tex]_{s}[/tex] + 2H⁺[tex]_{aq}[/tex] → Mg²⁺[tex]_{aq}[/tex] + H₂[tex]_{g}[/tex]

Answer:answer is A on edg

Explanation: