Which statement about fossil fuels is true?
_____________________________________
(any wrong/spams answers will be reported)
_____________________________________

(A) They are found deep within the earth.

(B) They do not cause pollution.

(C) They are renewable.

Answer:

C12H22O11 + 12O2 --> 12CO2 + 11H2O

Explanation:

C12H22O11 + 12O2 --> 12CO2 + 11H2O

C = 12

H = 22

O = 11 + 24 = 35

The balanced chemical equation is: C12H22O11 + 12 O2 → 12 CO2 + 11 H2O

C12H22O11 is the chemical formula for sucrose, a disaccharide composed of glucose and fructose monomers linked by a glycosidic bond. Sucrose is commonly known as table sugar and is a common sweetener in food and beverages. It is extracted from sugar cane or sugar beet and is widely used in the food industry.

Yes, it is necessary to balance a chemical equation to ensure that the law of conservation of mass is obeyed. This law states that matter cannot be created or destroyed in a chemical reaction but can only be rearranged into different combinations.

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Answer:

6 mol CO2

Explanation:

According to the equation, 6 moles of O2 will produce 6 moles of CO2, so the ratio is 1:1

therefore 6 moles of O2 will produce 6 moles of CO2

In the event where we began the reaction with 55 g of P2O5 and 16 g of H2O, we would have 12.9 g of extra P2O5.

CO2 (g) + 2H2O = CH4 (g) + 2O2 (g) (g) We can state that one CH4 molecule reacts with two O2 molecules to form one CO2 molecule and two H2O molecules, or we can say that one CH4 molecule reacts with two O2 molecules to form one CO2 molecule and two H2O molecules.

Moles of P₂O5 needed = 0.888 mol H₂O × (1 mol P₂O5 / 3 mol H₂O) = 0.296 mol P₂O5

Moles of excess P₂O5 = 0.387 mol P₂O5 - 0.296 mol P₂O5 = 0.091 mol P₂O5

To convert moles of excess P₂O5 to grams, we use the molar mass of P₂O5:

Mass of excess P₂O5 = 0.091 mol × 141.88 g/mol = 12.9 g

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The reactants are hydrochloric acid (HCI) and sodium hydroxide (NaOH). The products formed as a result of the reaction are sodium chloride (NaCl) and water (H₂O).

NaCl is not a reactant, but rather a compound formed as a product in the reaction between HCI and NaOH. H₂O is not a reactant in the first two reactions mentioned, but it is a product formed in the reaction between NaCl and H₂O, and in the reaction between HCI and NaOH.

What is salt?

salt refers to any ionic compound formed by the reaction between an acid and a base. The term "salt" is used to describe the product of this type of reaction because it often forms crystals with a crystalline structure that is similar to that of table salt (sodium chloride).

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The molarity of the solution is 0.0833 M.

The molarity (M) of a solution is defined as the number of moles of solute dissolved per liter of solution.

It is the measure of the concentration of any solute per unit volume of the solution.

In this case, we are given that there are 0.25 moles of NaOH dissolved in 3.0 liters of solution.

To find the molarity, we divide the number of moles by the volume in liters:

Molarity = moles of solute / volume of solution

Molarity = 0.25 moles / 3.0 L

Molarity = 0.0833 M

Therefore, the molarity is 0.0833 M.

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Moving a gas to a smaller container and holding the container over a Bunsen burner are two modifications that might raise a gas's pressure.

Gas pressure rises as container volume decreases. As a gas's temperature rises inside a rigid container, pressure also rises. The temperature, volume, and particle count of an enclosed gas are all variables that determine its pressure.

We can modify the pressure in two ways. First, we can make the air denser by either decreasing the volume of the container or adding additional air molecules to it.

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A gas is considered to be inactive if, under a specific set of circumstances, no molecular interactions occur.

A gas is considered to be inert if it does not easily experience chemical interactions with other chemicals and does not easily produce chemical compounds as a result. The noble gases, formerly known as the neutral gases, frequently do not combine with a wide variety of substances. Inert gases are typically used to prevent unintended chemical reactions from deteriorating a sample.

The oxygen and wetness in the air cause these unwanted chemical reactions, which are frequently oxidation and hydrolysis reactions. Because several of the noble gases can be made to respond under specific circumstances, the word "inert gas" is context-dependent. The most widely used inert gas is purified argon gas because of its large natural abundance (78.3% N2, 1% Ar in air) and cheap relative expense.

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That leaves us with options A and C. We know that the red liquid forms the top layer, and if it is less dense than both the green and blue liquids, then option A is correct.

What is Density?

Density is a physical property that describes the amount of mass per unit volume of a substance. It is a measure of how much matter is packed into a given amount of space.

Where mass is the amount of matter in an object and volume is the amount of space that the object occupies.

Based on the information given in the question, we can conclude that the liquids have different densities, with the most dense liquid forming the bottom layer and the least dense liquid forming the top layer. Therefore, option D is ruled out.

Since the green liquid forms the bottom layer, it must be more dense than both the blue and red liquids. Therefore, option B is ruled out.

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Al(NO3)3 sample of 6.3 g has an oxygen mass of 7.20 g.

Simply base your solution on the chemical formula provided because a chemical reaction is not provided.

Molar mass of Al2(SO4)3 = 342.15 g/mol

7.20 g Al2 (SO4)3 (1 mol/342.15g) (3mol O/2 mol Al) (1 mol O2/1/2 mol O2) (32g O2/1mol O2) = 4.04 g O2

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The correct option is d;  A is false but R is true , Examples include wastewater (sometimes called effluent) released by a manufacturing, an oil refinery, or a wastewater treatment facility, as well as pollution from leaky septic systems, chemical and oil spills, and unlawful dumping.

Most sewage is liquid waste. It is the waste water created by human activity from places like homes, businesses, hospitals, and workplaces that includes both liquid and solid wastes. Water, which contains dissolved and suspended pollutants, makes up the majority of it. Wastewater arises from typical life processes: bathing, toilet flushing, laundry, dishwashing, etc.

It emanates from home and domestic sources. Commercial wastewater originates from non-domestic sources such beauty parlors, taxidermie, furniture restoration, music instrument washing facilities, and car body shops.

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Full Question ;

The following question consists of two statements- Assertion (A) and Reason (R), An the question by selecting the suitable option given below. Assertion (A): Sewage is the dirty water that is generated by human activities.

Reason (R): Biogas is used to generate electricity.

(a) both A and R are true, and R is the correct explanation of A

(b) both A and R are true, and R is not the correct explanation of A

(c) A is true but R is false.

(D) A is false but R is true

Answer:

Step 1/2

First, we need to write the balanced chemical equation for the reaction: H2O(l) + CO2(g) → H2CO3(aq)

Step 2/2

Next, we can write the expression for the equilibrium constant, Kc, which is defined as the product of the concentrations of the products raised to their stoichiometric coefficients divided by the product of the concentrations of the reactants raised to their stoichiometric coefficients: Kc = [H2CO3] / ([H2O][CO2]) Therefore, the correct answer is 3. Kc = [H2CO3]^2/[H2O][CO2].

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The equilibrium constant expression for the reaction: H2O + CO2 (g) → H2CO3 (aq) is represented as [H2CO3] / ([H2O][CO2]). The concentration of water is usually omitted as it is a pure liquid.

The equilibrium constant expression for the given reaction: H2O + CO2 (g) → H2CO3 (aq) is often represented as the ratio of the concentrations of the products to the reactants, raised to the power of each concentration's stoichiometric coefficient. In this case, the expression for the equilibrium constant (Kc) would be: [H2CO3] / ([H2O][CO2]). Note that the concentration of water is not generally considered in the expression since water is a pure liquid.

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Answer:

Assuming that the addition of 5.00 mL of 0.011 M HCl to 50.00 mL of pure water does not significantly affect the volume of the solution:

Calculate the number of moles of HCl added:

moles HCl = concentration x volume = 0.011 mol/L x 0.00500 L = 5.50 x 10^-5 mol

Calculate the total volume of the solution:

total volume = 50.00 mL + 5.00 mL = 55.00 mL = 0.055 L

Calculate the concentration of H+ ions in the solution:

[H+] = moles HCl / total volume = 5.50 x 10^-5 mol / 0.055 L = 1.00 x 10^-3 M

Calculate the pH of the solution:

pH = -log[H+] = -log(1.00 x 10^-3) = 3.00

Therefore, the pH of the solution is 3.00.

Explanation:

Answer:

1- volume of balloon = 0.46949 L
2- volume = 0.71399 L
3- V = 0.28510 L = 285.102 mL
4- V = 1.80537 L

Explanation:
It's all about Charles' law

Charles' law: The volume of an ideal gas is directly proportional to the absolute temperature AT CONSTANT PRESSURE.

then, we conclude that:

[tex]\frac{V_{1} }{T_{1} } = \frac{V_{2} }{T_{2} }[/tex]

in which V1 : initial volume in Liters, T1: initial temperature in Kelvin, V2: final volume in Liters, T2: final temperature in Kelvin.

*Temperature in Kelvin = Temperature in Celsius + 273

in Q1:

[tex]\frac{0.5}{22+273} =\frac{V_{2} }{4+273}[/tex]

[tex]V_{2} = \frac{0.5(4+273)}{22+273} = 0.46949 L[/tex]

in Q2:

[tex]\frac{0.4}{293} = \frac{V_{2}}{523}[/tex]

[tex]V_{2} = \frac{523 * 0.4 }{293} = 0.71399 L[/tex]

in Q3:

[tex]\frac{0.25}{292} = \frac{V_{2}}{333}[/tex]

[tex]V_{2} = \frac{333*0.25}{292} = 0.285102 L = 285.102mL[/tex]

in Q4:

[tex]\frac{2}{298} = \frac{V_2}{269}[/tex]

[tex]V_2 = \frac{2*269}{298} = 1.80537 L[/tex]

The hydrogen ion has a concentration of 1000 times more than the hydroxide ion, which has a concentration of 3.1623× 10^9 M.

Assume that x is the hydroxide ion concentration.

x=[OH−]

If the hydrogen ion is 1000 times more abundant, then [H+]=1000x (x)=1.010^14x^2=1.010^14

1000x=√1.010^14

1000x=3.162310^9

[OH] =3.1623×10^9 M

Hence, 3.1623 10^9 M of hydroxide ions are present.

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The value of the equilibrium constant, Ksp, for silver carbonate (Ag2CO3) is 2.07 x 10^-11.

The solubility product constant (Ksp) is a measure of the solubility of a sparingly soluble salt. For silver carbonate (Ag2CO3), the equilibrium expression for its dissolution in water is:

Ag2CO3(s) ⇌ 2Ag+(aq) + CO3^2-(aq)

The corresponding equilibrium constant expression for the reaction is:

Ksp = [Ag+]^2[CO3^2-]

where [Ag+] and [CO3^2-] are the molar concentrations of silver ions and carbonate ions in the solution, respectively.

We are given the molar solubility of Ag2CO3, which is 1.28 x 10^-4 M. This means that when Ag2CO3 dissolves in water, it dissociates to form 2Ag+ ions and 1 CO3^2- ion. Therefore, we can assume that the initial molar concentration of Ag+ and CO3^2- in the solution are also 1.28 x 10^-4 M.

Substituting these values into the Ksp expression, we get:

Ksp = [Ag+]^2[CO3^2-] = (1.28 x 10^-4 M)^2(1.28 x 10^-4 M) = 2.07 x 10^-11

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2 Na2O (s) + 2 Cl2 (g)  4 NaCl (s) + O2 is the general equation for the reaction that generates NaCl and O2 from Na2O and Cl2. (g).

The interaction of sodium with chlorine (Cl) to form sodium chloride is an illustration of a synthesis reaction. (NaCl). The chemical formula for this reaction is 2Na + Cl2 2NaCl.

Sodium is oxidised (its oxidation number grows from 0 in Na to +1 in NaCl) and chlorine is reduced (its oxidation number reduces from 0 in Cl2 to 1 in NaCl) sodium chloride is created when these two elements react.

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Nuclear reactions can be affected  by temperature.

option A.

Temperature can affect nuclear reactions by increasing the kinetic energy of the particles, which can result in more collisions and a higher likelihood of nuclear reactions occurring.

Pressure does not directly affect nuclear reactions, as they primarily involve the nucleus of an atom and not the electrons or other components of the atom that are influenced by pressure.

Catalysts are not typically involved in nuclear reactions, as they involve changes to the nucleus of an atom and not the chemical reactions that catalysts typically affect.

Therefore, the correct answer is A, temperature.

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Taking into account the definition of wavelength, frecuency and propagation speed, the wavelength of a yellow light with a frequency of 5.2×10¹⁴ Hz is 5.77×10⁻⁷ m.

The length of a wave is the spatial period of the wave, that is, the distance at which the waveform repeats itself. Two consecutive points that have the same phase are normally considered: two maximums, two minimums, two zero crossings (in the same direction).

This is, wavelength is the minimum distance between two successive points on the wave that are in the same state of vibration. It is expressed in units of length (m).

Frequency is a measure of the number (amount of cycles) of waves generated in a unit of time. Its unit is s⁻¹ or hertz (Hz).

The propagation speed is the speed with which the wave propagates in the medium, that is, it is the magnitude that measures the speed at which the wave disturbance propagates along its displacement.

The propagation speed relate the wavelength (λ) and the frequency (f) inversely proportional using the following equation:

v = f×λ

All electromagnetic waves propagate in a vacuum at a constant speed of 3×10⁸ m/s, the speed of light.

In this case, you know:

Replacing in the definition of propagation speed:

3×10⁸ m/s= 5.2×10¹⁴ Hz× λ

Solving:

λ= 3×10⁸ m/s ÷ 5.2×10¹⁴ Hz

λ= 5.77×10⁻⁷ m

In summary, the wavelength of the yellow light is 5.77×10⁻⁷ m.

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Answer:

Looking at the balanced chemical equation:

Mg(OH)2 + 2HCl → 2H2O + MgCl2

We can see that for every 2 moles of hydrochloric acid (HCl) that react, 2 moles of water (H2O) are produced.

Therefore, if 2 moles of HCl produce 2 moles of H2O, then 9.8 moles of HCl will produce:

(9.8 mol HCl) x (2 mol H2O/2 mol HCl) = 9.8 mol H2O

So, 9.8 moles of hydrochloric acid reacting with magnesium hydroxide will produce 9.8 moles of water.

Explanation:

Therefore, the concentration of casein in the milk solution is approximately 1.121 × 10⁻⁵ mol/L.

Concentration is a measure of the amount of a substance present in a given volume or mass of a solution or mixture. It is usually expressed in units of mass per unit volume (e.g. g/L), moles per unit volume (e.g. mol/L), or percentage by mass or volume (e.g. % w/v or % v/v). Concentration is an important concept in chemistry, biochemistry, and many other fields. It allows us to quantify the amount of a substance present in a solution or mixture, and to compare the concentrations of different substances. It is also used to determine the stoichiometry of chemical reactions, to calculate reaction rates, and to monitor the progress of chemical reactions. In general, the concentration of a substance depends on the amount of the substance and the volume or mass of the solution or mixture. Thus, concentration can be changed by adding or removing a substance, or by changing the volume or mass of the solution or mixture.

Here,

First, let's calculate how much casein is in the 1 g of milk powder:

80% of 0.349 g = 0.2792 g of casein

Next, let's calculate the concentration of casein in the milk solution. We'll assume that the milk solution is made by dissolving the 1 g of milk powder in water to make a total volume of 100 mL (or 0.1 L) of solution:

Concentration of casein = mass of casein / volume of solution

Mass of casein = 0.2792 g

Volume of solution = 0.1 L

Concentration of casein = 2.792 g/L or 2.792 mg/mL

Finally, let's calculate the concentration of hydrolyzed casein, which we'll assume is completely broken down into its constituent amino acids. The molecular weight of casein is 24,891 g/mol, so the molecular weight of each amino acid is approximately 110 g/mol (since casein is about 80% amino acids). Therefore, we can estimate that the molecular weight of hydrolyzed casein is about 110 g/mol:

Concentration of hydrolyzed casein = concentration of casein * (molecular weight of casein / molecular weight of hydrolyzed casein)

Concentration of casein = 2.792 mg/mL

Molecular weight of casein = 24,891 g/mol

To calculate the concentration of hydrolyzed casein, we need more information about the degree of hydrolysis of the casein. If we know the percentage of the casein that has been hydrolyzed, we can calculate the concentration of hydrolyzed casein using a similar approach as above.

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We would require 7.07 g of iron to generate 8 g of copper.

It is a common metal in the Earth's crust that is thick, glossy, and silver-gray in color. By mass, iron is the fourth most prevalent metal in the crust of the Earth and the most prevalent element overall.

The reaction between copper(II) sulfate and iron is a redox process in which copper(II) ions are reduced to copper metal and iron is oxidized to iron(II) sulfate. The reaction's chemically balanced equation is as follows:

Fe(s) + CuSO4(aq) → Cu(s) + FeSO4(aq)

The balanced equation reveals that the molar ratio of copper to iron is 1:1. Therefore, 1 mole of copper is created for every mole of iron utilized.

We must first convert the mass of copper to moles, and then apply the mole ratio to determine how many moles of iron are required to generate 8 g of copper.

Copper has a molar mass of 63.55 g/mol. As a result, the amount of copper produced is:

8 g / 63.55 g/mol = 0.126 moles

Since iron and copper have a mole ratio of 1:1, we require as many moles of iron as we do with copper:

0.126 moles of Cu = 0.126 moles of Fe

Iron has a molar mass of 55.85 g/mol. The required amount of iron is thus:

0.126 moles x 55.85 g/mol = 7.07 g of Fe

Hence, we would require 7.07 g of iron to generate 8 g of copper.

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Answer:

An allele is a variant form of a gene that occurs at a specific location on a chromosome. In other words, it is one of two or more versions of a gene that exist in a population or an individual organism.

Each organism inherits two copies of each gene, one from each parent. The two copies may be the same (homozygous) or different (heterozygous) alleles. The combination of alleles determines the organism's genotype, which in turn influences its phenotype, or observable traits.

Alleles may differ in their effects on the organism, with some being dominant (expressed even in the presence of a different allele) and others being recessive (expressed only in the absence of a dominant allele). The study of alleles and their effects on inheritance is known as genetics, a field that has important applications in medicine, agriculture, and many other areas.

Explanation:

The volume of 0.1 M ammonia obtained from the reaction is 0.504 L.

The balanced chemical equation for the reaction between ammonium chloride and sodium hydroxide is:

NH4Cl + NaOH → NaCl + H2O + NH3

From the equation, we can see that 1 mole of ammonium chloride produces 1 mole of ammonia.

First, we need to calculate the number of moles of ammonium chloride present in 2.7 g of NH4Cl:

Molar mass of NH4Cl = 14.01 + 1.01 x 4 + 35.45 = 53.49 g/mol

Number of moles of NH4Cl = mass / molar mass = 2.7 g / 53.49 g/mol = 0.0504 mol

Since the reaction goes to completion and we have an excess of sodium hydroxide, all of the ammonia produced will be absorbed by the 0.1 M solution of the absorber.

The concentration of the ammonia solution can be calculated as follows:

0.1 M = moles of NH3 / volume of NH3 solution (in liters)

moles of NH3 = 0.0504 mol (from above)

Volume of NH3 solution = moles of NH3 / 0.1 M = 0.0504 mol / 0.1 M = 0.504 L

Therefore, the volume of 0.1 M ammonia obtained from the reaction is 0.504 L.

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The mass in gram of aluminum deposited (c) 0.27 g.

The balanced chemical equation for the electrolysis of aluminum chloride is:

2 AlCl3 → 2 Al + 3 Cl2

From this equation, we can see that 2 moles of Al will be produced for every 2 moles of AlCl3 consumed. The molar mass of Al is 27 g/mol, so the mass of Al produced can be calculated using the following formula:

mass of Al = (current × time × molar mass of Al) / (3 × Faraday's constant)

where the current is in amperes, time is in seconds, Faraday's constant is in coulombs per mole of electrons (F = 96500 C), and the factor of 3 in the denominator comes from the stoichiometry of the reaction.

Plugging in the values given in the problem, we get:

mass of Al = (10 A × 96.5 s × 27 g/mol) / (3 × 96500 C/mol) = 0.27 g

Therefore, the answer is (c) 0.27 g.

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Answer:

The molar mass of O2 is 32g/mol.

Explanation:

So the mol amount of these O2 is 56/32=2 mol. STP stands for the standard temperature and pressure which means the temperature is 0 ℃ and pressure is 100 kPa. And the molar volume of gas is 22.7 L/mol under STP. So the answer is 22.7*2=45.4 L

Answer:

we need 19.52 g of sugar to produce 10 g of ethanol.

Explanation:

The balanced chemical equation for the fermentation of glucose (sugar) to ethanol (C2H5OH) is:

C6H12O6 → 2C2H5OH + 2CO2

From the equation, we can see that one mole of glucose (C6H12O6) reacts to produce two moles of ethanol (C2H5OH). To determine how many grams of sugar are needed to produce 10g of ethanol, we need to use stoichiometry and the molar mass of glucose.

The molar mass of glucose is 180.16 g/mol, and the molar mass of ethanol is 46.07 g/mol. Therefore, we can calculate the number of moles of ethanol produced from 10 g as follows:

moles of C2H5OH = mass / molar mass = 10 g / 46.07 g/mol = 0.217 moles

Since two moles of ethanol are produced from one mole of glucose, we can calculate the number of moles of glucose needed as follows:

moles of glucose = 0.217 moles / 2 = 0.1085 moles

Finally, we can calculate the mass of glucose needed as follows:

mass of glucose = moles of glucose × molar mass of glucose

mass of glucose = 0.1085 moles × 180.16 g/mol

mass of glucose = 19.52 g

[tex] \:\:\:\:\:\: \sf \underline{\pink{C_6H_{12}O_6} \longrightarrow \pink{2\:C_2H_5OH}+2CO_2}\\[/tex]

As per this equation, 1 mole of [tex]\sf C_6H_{12}O_6 [/tex] produces 2 moles of [tex]\sf C_2H_5OH[/tex] and 2 moles of [tex]\sf CO_2[/tex]

Molar mass of 1 mole of [tex]\sf C_6H_12O_6 [/tex]-

[tex] \:\:\:\:\:\:\longrightarrow \sf Molar\: Mass_{( C_6H_{12}O_6 )} = 12\times 6 + 1\times 12 + 16 \times 6\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf Molar\: Mass_{( C_6H_{12}O_6 )} =\underline{180 \:grams }\\[/tex]

Molar Mass of 2 moles of [tex]\sf C_2H_5OH[/tex]-

[tex] \:\:\:\:\:\:\longrightarrow \sf Molar \:Mass _{( C_2H_5OH)} = 2\bigg(12 \times2 + 1\times 5 + 16 +1\bigg)\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf Molar \:Mass _{( C_2H_5OH)} =2\times 46 \\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf Molar \:Mass _{( C_2H_5OH)} =\underline{92\: grams }\\[/tex]

As per equation, 92 grams of [tex]\sf C_2H_5OH[/tex] can be produced from 180 grams of sugar. So, for making 10 grams of [tex]\sf C_2H_5OH[/tex],we have to multiply 180 by 10 and then divide by 92. 180 grams of sugar is needed to make 92 grams of ethanol. Therefore -

[tex] \:\:\:\:\:\:\longrightarrow \sf \dfrac{180\times 10}{92}\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf \underline{\pink{19.565 \:grams }}\\[/tex]

19.565 grams of sugar will be needed to make 10 g [tex]\sf C_2H_5OH[/tex]

This means that for every 2 moles of carbon dioxide produced, 3 moles of oxygen are consumed. Conversely, for every 3 moles of oxygen consumed, 2 moles of carbon dioxide are produced.

What is Molar Ratio?

The molar ratio is a term used in chemistry that describes the ratio between the number of moles of one substance in a chemical reaction to another substance in the same reaction.

In a balanced chemical equation, the coefficients that are written in front of each reactant and product represent the relative numbers of moles of each substance that are involved in the reaction. The molar ratio is simply the ratio of the coefficients of any two substances in the reaction

The balanced chemical equation is:

C2H4 + 3O2 → 2CO2 + 2H2O

From this equation, we can see that the molar ratio of carbon dioxide (CO2) to oxygen (O2) is 2:3.

It's important to note that the molar ratio is based on the coefficients of the balanced equation, which represent the relative number of molecules or moles of each substance involved in the reaction. The molar ratio can be used to calculate the amount of reactants or products involved in the reaction, given the amount of one of the substances.

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Answer:

As a general rule of thumb, compounds that involve a metal binding with either a non-metal or a semi-metal will display ionic bonding. Compounds that are composed of only non-metals or semi-metals with non-metals will display covalent bonding and will be classified as molecular compounds.