2H2O(l) --> 2H2(g) + O2(g), How many moles of H2O are required to yield 22.4 L of O2 at STP?

Total, 2 moles of iron (II) nitrate would be needed to produce a 4 moles of lithium nitrate.

The balanced chemical equation for the reaction is;

2Li + 1Fe(NO₃)₂ → 1Fe + 2LiNO₃

From this equation, we can see that 2 moles of lithium nitrate are produced for every 1 mole of iron (II) nitrate used.

To determine how many moles of iron (II) nitrate are needed to produce 4 moles of lithium nitrate, we can use the mole ratio from the balanced equation;

moles of LiNO₃ = 4

moles of Fe(NO₃)₂ = (4 mol LiNO₃) x (1 mol Fe(NO₃)₂ / 2 mol LiNO₃)

= 2 mol Fe(NO₃)₂

Therefore, 2 moles of iron (II) nitrate is needed to produce 4 moles of lithium nitrate.

To know more about iron (II) nitrate here

https://brainly.com/question/31428625

#SPJ1

Consequently, 1.57 litres is the volume of a 3.00 M solution prepared using 4.70 moles of LIF.

Probably the most often used unit of measurement for solution concentration is molarity, abbreviated as (M). The ratio of the number of litres of solution to the number of moles of solvent is known as molarity. For instance, we may use the terms "1.5 molar solution" or "1.5 M" to describe a solution.

To calculate the volume of a 3.00 M solution made with 4.70 moles of LIF, we can use the formula:

Molarity is equal to the moles of solute times the litres of solution.

Rearranging the formula to solve for the volume of the solution, we get:

Volume of solution = moles of solute ÷ (Molarity x 1000)

Where 1000 is the conversion factor from milliliters to liters.

Plugging in the values given, we get:

Volume of solution = 4.70 moles ÷ (3.00 mol/L x 1000)

Volume of solution = 1.57 L

To know more about solution visit:-

https://brainly.com/question/30665317

#SPJ1

Li₃PO₄ + 3 Zn(NO₃)₂ → 3 LiNO₃ + Zn₃(PO₄)₂. In this balanced equation, one of the products is Zn₃(PO₄)₂. To ensure that the equation is balanced, we need 3 moles of Zn(NO₃)₂ for every 1 mole of Li₃PO₄.

In a chemical reaction, a product is a substance that is formed as a result of the chemical reaction. It is the end result of a chemical reaction, and it is produced by the rearrangement of atoms and/or ions of the reactants.

In the given equation, we end up with 1 mole of Zn₃(PO₄)₂ for every 3 moles of Zn₃(PO₄)₂. This means that the molar ratio of Zn₃(PO₄)₂ to Zn₃(PO₄)₂ is 1:3, indicating that we need three times as much Zn₃(PO₄)₂ as Zn₃(PO₄)₂ to balance the equation. Therefore, one of the products, Zn₃(PO₄)₂, must be produced in a smaller quantity than the other product, LiNO₃.

To know more about chemical reaction, visit:

https://brainly.com/question/29039149

#SPJ1

The new temperature of a sample of gas initially at 0°C and contains 100L is 546K.

The temperature of a gas can be calculated using the Charles' law equation as follows:

V₁/T₁ = V₂T₂

Where;

According to this question, the volume of a sample of a gas at 0°C is 100 liters. If the volume of the gas is increased to 200 liters at constant pressure, the new temperature is as follows:

100/273 = 200/T₂

200 × 273 = 100T₂

T₂ = 546K

Learn more about temperature at: https://brainly.com/question/15354399

#SPJ1

The expected result of the experiment is that the rate of precipitation of sulfur will be faster with hydrogen chloride than with acetic acid.

What is Precipitation?

Precipitation refers to the process in which a substance in a solution comes out of solution and forms a solid. This occurs when the concentration of the substance exceeds its solubility limit in the solution, resulting in the formation of solid particles that settle at the bottom of the solution.

Procedure:

Prepare a series of solutions with different monobasic acids. For example, you can prepare solutions of sodium thiosulphate (Na2S2O3) with different monobasic acids, such as hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3), at a constant concentration and volume.

Place equal volumes of the thiosulphate solution and each monobasic acid solution in separate beakers or test tubes.

Start the timer or stopwatch as soon as the two solutions are mixed. The thiosulphate ions will react with the hydrogen ions from the monobasic acid, resulting in the formation of sulphur precipitate according to the following chemical equation:

S2O3^2- + 2H+ -> H2O + S + SO2

Observe the reaction and record the time taken for the formation of sulphur precipitate in each solution.

Compare the rates of precipitation of sulphur for each monobasic acid solution to study the dependence of the rate on the nature of the monobasic acid. Note any trends or differences in the rates of precipitation among the different acids used.

Learn more about Precipitation from the given link

https://brainly.ph/question/28529575

#SPJ1

There are 91.84L of a 0.200 M sodium cyanide solution would be needed to react with 45.0kg of rocks that contain 2.00% by mass of gold

The formula for % w/w is mass of solute /mass of solution*100

Substituting the values in the equation

2%= mass of solute/45000 *100

mass of solute= 2*45000/100

mass of solute = 900 gram

Now, to calculate the volume we use the molarity given

molecular weight of sodium cyanide is 49 g/mol

Molarity= mass of solute/molecular mass *volume

0.2=900/49* volume

volume= 900/49*0.2

volume= 91.84 liter

The mass percentage of a solute in solution is the percent concentration of a substance (solute) in solution when it is stated as 'w/w'. This phrase is frequently used when the solute and solution are weighted.

For more information on molarity kindly visit to

https://brainly.com/question/8732513

#SPJ1

The car's average speed is 116 kilometers per hour.

The entire distance traveled divided by the total time elapsed is the definition of average speed. It is typically stated in terms of the amount of time or distance per unit, such as meters per second (m/s) or kilometers per hour (km/hr).

Average speed = total distance ÷ total time

In this case, the total distance is 464 km and the total time is 4 hours.

Average speed = 464 km ÷ 4 hours

Average speed = 116 km/hr

Therefore, the car's average speed is 116 kilometers per hour.

learn more about average speed here

https://brainly.com/question/4931057

#SPJ1

The balanced equation for the reaction of acetylene (C₂H₂) and oxygen (O₂) is; 2 C₂H₂(g) + 5 O₂(g) → 4 CO₂(g) + 2 H₂O(g) + heat

The coefficients in the balanced equation represent the stoichiometric ratio of the reactants and products in the chemical reaction. In this case, 2 molecules of acetylene (C₂H₂) react with 5 molecules of oxygen (O₂) to produce 4 molecules of carbon dioxide (CO₂) and 2 molecules of water (H₂O), along with the release of heat.

The balanced equation shows that the number of atoms of each element is the same on both the sides of the equation, in accordance with the law of conservation of mass.

To know more about acetylene here

https://brainly.com/question/20529866

#SPJ1

An antacid tablet's CaCO content should be between 25 and 35% by mass.

To completely neutralise 20 ml of HCl solution, 19.85 ml of 0.01 M NaOH solution is required.

It is a neutralisation reaction in which sodium hydroxide, a basic, interacts with  to form salt sodium phosphate, which is salt and water. According to the stoichiometric mole ratio, three moles of sodium hydroxide are needed to neutralise one mole of phosphoric acid.

To calculate the amount of moles of acid neutralised by the tablet, subtract the number of moles of acid neutralised in the titration from the starting solution's moles of acid.

learn more about antacid tablet

https://brainly.com/question/27720401

#SPJ1

Answer:

Volume required ≈ 20.8 mL

When a solution is diluted, the total number of moles of solute (n), does not change. Only the total solution volume changes. As n=cV (molarity formula, where n = moles, c = concentration, V = volume), then the value of cV is a constant when diluting solutions. This can be expressed by the ratio:

c₁V₁ = c₂V₂, where subscripts 1 and 2 represent the concentrated and dilute solutions.

To dilute a solution of 6.0 M HCl to 0.25 M with a total volume of 0.500 L, we can use the dilution formula, where initial and final concentrations = 6.0 M and 0.25 M respectively, and final volume = 0.500 L (500 mL).

Hence, 6.0×V₁ = 0.25×0.500 = 0.125

V₁ = 0.125/6.0 = 0.02083 L

Therefore, the volume we require is ≈ 20.8 mL

The amount of heat required to melt 13.3 g of ice at 0°C in water at 0°C is approximately 4.43 kJ.

What is Heat?

Heat is a form of energy that is transferred between objects or systems as a result of a temperature difference. It is a form of energy associated with the motion of particles, such as atoms and molecules, within a substance. Heat energy is responsible for changing the temperature of a substance or causing phase transitions, such as melting, boiling, or condensing.

Given:

Mass of ice (m) = 13.3 g

ΔHfus for water = 6.01 kJ/mol

First, we need to convert the mass of ice from grams to moles, using the molar mass of water. The molar mass of water (H2O) is:

2(atomic mass of hydrogen) + atomic mass of oxygen

= 2(1.008 g/mol) + 15.999 g/mol

= 18.015 g/mol

So, moles of ice (n) = mass of ice (m) / molar mass of water

= 13.3 g / 18.015 g/mol

= 0.7386 mol

Now, we can use the formula to calculate the heat required:

Q = m * ΔHfus

= 0.7386 mol * 6.01 kJ/mol

= 4.43 kJ (rounded to two decimal places)

Learn more about Heat from the given link

https://brainly.com/question/25603269

#SPJ1

The  volume of acetone would be required to purify a 5.0g sample of compound is 58.82ml

Let use the solubility data of acetone provided to calculate the volume.

First we will need to calculate the solubility of Y in 25 degree.

   Solubility of Y= 0.12g/10ml= 0.012g/ml.

Solubility of y in boiling acetone = 0.85g/10ml =0.085g/ml.

In order to purify y, we need to dissolve the amount of y in the 5.0g sample.

The amount of acetone needed to dissolve y in the sample is

amount acetone= mass of y/ solubility of y in boiling acetone.

amount acetone= 5.0g/0.085g/ml= 58.82ml.

Therefore, the  volume of acetone would be required to purify a 5.0g sample of compound is 58.82ml

Learn more about volume below.

https://brainly.com/question/30164274

#SPJ1

Unitless calculations and rounding the final answer to the proper number of significant figures : a) 3.323   b)  5.8  c)  42.02  d) 15.7025

Significant figures represent the meaningful and reliable digits in a number.

a) 3.41 - 0.086652 = 3.323348

Since both numbers have four significant figures, the final answer should also have four significant figures. Therefore, rounding the final answer to four significant figures gives: 3.323

b) 17.441 / 3 = 5.813666666666666

The least precise value in this calculation is 3, which has only one significant figure. Therefore, rounding the final answer to one significant figure gives: 5.8

c) 21.01 * 2 = 42.02

Both numbers have four significant figures, so the final answer should also have four significant figures. Therefore, the final answer is: 42.02

d) 18.7644 - 3.472 + 0.4101 = 15.7025

All three numbers have five significant figures, so the final answer should also have five significant figures. Therefore, the final answer is: 15.7025.

To know more about significant figures, refer

https://brainly.com/question/24491627

#SPJ1

The percent yield for the reaction is 13.1%. it is the weight of the product that was obtained to the theoretical yield as a percentage.

The percentage yield is the figure computed to represent the discrepancy between the theoretical yield and the actual yield of an experiment. Both the desired products and the by-products are produced when experimenting with various solutions or when preparing chemical solutions.

We must convert the amounts of NO and O2 to moles since 1 mol of NO reacts with 1/2 mol of O2:

moles of NO = 33.6 g / 30.01 g/mol = 1.12 mol

moles of O2 = 26.9 g / 32.00 g/mol = 0.84 mol

Since O2 is limiting, Our calculations will be based on the amount of oxygen present.

moles of NO2 = 0.84 mol O2 × (2 mol NO2 / 1 mol O2) × (2 mol NO / 1 mol NO2)

                       = 3.36 mol NO2

The molar mass of NO2 is 46.01 g/mol,

the theoretical yield in grams is:

mass of NO2 = 3.36 mol × 46.01 g/mol = 154.34 g

percent yield = (20.2 g / 154.34 g) × 100% = 13.1%

To know more about the percent yield visit:

https://brainly.com/question/11963853

#SPJ1

The theoretical yield of Acetylsalicylic acid is found out to be: 3.01 grams.

The limiting reagent is a substance that prevents a chemical reaction from occurring completely.

When a limiting reagent is used in a chemical reaction, the atoms, molecules, or ions of the other reactant that it (the limiting reagent) reacts with will either stay free or unreacted.

Popular compounds called acids and bases interact with one another to create salt and water. The Latin word "acere," which meaning "sour," is where the term "acid" originates.

According to the problem, we have 2.31 grams of salicylic acid. We need to determine the theoretical yield of acetylsalicylic acid.

The molar mass of salicylic acid is 138.12 g/mol. Therefore, the number of moles of salicylic acid we have is:

n = mass / molar mass

n = 2.31 g / 138.12 g/mol

n = 0.0167 mol

According to the balanced equation, 1 mole of salicylic acid reacts with 1 mole of acetic anhydride to produce 1 mole of acetylsalicylic acid. Therefore, the number of moles of acetylsalicylic acid produced is also 0.0167 mol.

The molar mass of acetylsalicylic acid is 180.16 g/mol. Therefore, the theoretical yield of acetylsalicylic acid is:

mass = n x molar mass

mass = 0.0167 mol x 180.16 g/mol

mass = 3.01 g

Therefore, the theoretical yield of acetylsalicylic acid is 3.01 grams.

To know more about reagent visit:

https://brainly.com/question/31228572

#SPJ1

The molarity of the solution is 0.0156 M (or mol/L).

More precisely, a solution of iron(III) nitrate, will react with a solution of sodium hydroxide, to generate iron(III) hydroxide, which precipitates out of solution. The insoluble solid is not shown as ions, as you will see.

The molar mass of Iron(III) nitrate is:

Iron: 1 atom x 55.85 g/mol = 55.85 g/mol

Nitrogen: 3 atoms x 14.01 g/mol = 42.03 g/mol

Oxygen: 9 atoms x 16.00 g/mol = 144.00 g/mol

Total molar mass is equal to 241.88 g/mol (55.85 + 42.03 + 144.00).

So, the number of moles of Iron(III) nitrate in 8.55 g is:

moles = mass/molar mass = 8.55 g/241.88 g/mol = 0.0353 mol

The solution's volume in litres must then be determined. 2.26 L is listed as the volume.

The unit of measurement for molarity is moles of solute per litre of solution.

Molarity = 0.0353 mol / 2.26 L = 0.0156 M

To know more about molarity visit:-

https://brainly.com/question/8732513

#SPJ1

In this reaction, 8.55 grammes and 11.34 grammes of KCN will react.KCN's molar mass, 65.12 g/mol, is equal to its molecular mass, or mass of KCN, which is equal to 0.1744 mol.

Something that occurs in response to another event is called a reaction. A reaction is an procedure where any number of compounds are changed into other substances in science. This occurs when chemical bonds are broken & new ones are formed.

They responded favourably to the news. He expressed disbelief when I first informed him what had transpired. Most attendees at the conference reacted to the announcement with anger or shock. When I initially met him, I didn't believe he was trustworthy.

To know more about reaction visit:

https://brainly.com/question/28984750

#SPJ1

The final temperature with Specific heat = 0.385 J/g °C for copper is 57.7 °C.

Specific heat is a measure of the amount of heat energy required to raise the temperature of a unit mass of a substance. It is a physical property of a material and is usually measured in units of J/(g °C) or J/(g K).

q = m * c * ΔT

where q is the heat absorbed (in joules), m is the mass of the substance (in grams), c is the specific heat (in J/(g °C)), and ΔT is the change in temperature (in °C).

Plugging in the values,

6.30 kJ = 500.0 g * 0.385 J/(g °C) * ΔT

Simplifying the equation, we get:

ΔT = (6.30 kJ) / (500.0 g * 0.385 J/(g °C))

ΔT = 32.7 °C

The final temperature of the copper is as follows:

25 °C + 32.7 °C = 57.7 °C

To know more about specific heat, click here

https://brainly.com/question/11297584

#SPJ1

We can start by using Dalton's Law of Partial Pressures, which states that the total pressure of a gas mixture is equal to the sum of the partial pressures of each individual gas component.

Let PCO2 be the partial pressure of CO2 in the mixture after it is added. Then, we can set up the following equation:

PO2 + PN2 + PAr + PCO2 = Ptotal

Substituting in the given partial pressures and total pressure, we get:

100 torr + 150 torr + 200 torr + PCO2 = 575 torr

Simplifying the equation, we get:

PCO2 = 575 torr - 100 torr - 150 torr - 200 torr

PCO2 = 125 torr

Therefore, the partial pressure of CO2 in the gas mixture is 125 torr. Answer: B) 125 torr.

B. It will be slow because you will have to wait for natural processes to affect each area.

What is Ocean?

An ocean is a vast body of saltwater that covers more than 70% of the Earth's surface. Oceans are the largest bodies of water on our planet and are essential for supporting life on Earth. Oceans play a crucial role in regulating the Earth's climate, absorbing heat and carbon dioxide, and generating oxygen.

The impact of human activities on ocean shores zones, such as coastal development, pollution, and overfishing, can have long-lasting and sometimes irreversible effects on these ecosystems. Restoring or mitigating the impacts of human activities on ocean shores zones requires time and effort, as natural processes need to take place to restore the affected areas.

Learn more about Ocean from the given link

https://brainly.com/question/15087582

#SPJ1

The empirical formula of the oxygenated hydrocarbon is CH2O.

We need to determine the mole ratios of the elements present in the compound using the given masses and the molar masses of the elements.

First, we need to find the moles of carbon dioxide and water vapor produced in the reaction:

moles of CO2 = 1.76 g / 44.01 g/mol = 0.0400 mol CO2

moles of H2O = 1.08 g / 18.02 g/mol = 0.0599 mol H2O

Next, we need to find the moles of carbon and hydrogen in the compound. We can do this by using the masses of carbon dioxide and water vapor produced, the molar masses of the elements, and the balanced chemical equation for the combustion of hydrocarbons:

CxHyOz + (x + y/4 - z/2) O2 -> x CO2 + (y/2) H2O

From the balanced equation, we can see that the mole ratio of carbon to carbon dioxide is 1:1, and the mole ratio of hydrogen to water vapor is (1/2):(1/2) or 1:1. Therefore:

moles of C = moles of CO2 = 0.0400 mol CO2

moles of H = 2 × moles of H2O = 0.1198 mol H2O

Finally, we can find the mole ratio of carbon to hydrogen in the compound:

mol ratio of C to H = (moles of C) / (moles of H) = 0.0400 mol CO2 / 0.1198 mol H2O ≈ 0.334

To get whole numbers for the mole ratio, we can multiply both sides by a common factor, such as 3:

mol ratio of C to H ≈ 0.334 ≈ 1/3

mol ratio of C to H = 1

mol ratio of O to H = (moles of O) / (moles of H) = (moles of CxHyOz - moles of C - moles of H) / (moles of H) = (0.0400 mol CO2 + 0.0599 mol H2O - 0.0400 mol C - 0.1198 mol H) / 0.1198 mol H = 0.213

To get whole numbers for the mole ratio, we can multiply both sides by a common factor, such as 5:

mol ratio of O to H ≈ 0.213 ≈ 2/9

mol ratio of O to H = 2

Therefore, the empirical formula of the oxygenated hydrocarbon is CH2O.

Learn more about empirical formula here : brainly.com/question/13058832

#SPJ1

The running pressure of the HPLC procedure in torr is approximately 2068.2687 torr.

What is Chromatography?

Chromatography is a technique used to separate, identify, and analyze the components of a mixture based on their differential affinities to a stationary phase and a mobile phase. It is widely used in chemistry, biochemistry, pharmaceuticals, environmental science, forensics, and other fields for purification, separation, and analysis of chemical compounds.

To convert pressure from pascals (Pa) to torr, we can use the following conversion:

1 torr = 101325 Pa

So, to convert the pressure from pascals to torr, we can divide the pressure in pascals by 101325.

Given:

Pressure in pascals (Pa) = 2.09 × [tex]10^{8}[/tex] Pa

Using the conversion factor:

Pressure in torr = (2.09 × [tex]10^{8}[/tex]Pa) / 101325 Pa/torr

Calculating the numerical value in torr:

Pressure in torr = 2068.2687 torr (rounded to four decimal places)

Learn more about Chromatography from the given link

https://brainly.com/question/1394204

#SPJ1

The mass (in grams) of CuO formed when 63.5 g of copper, Cu is heated strongly in air is 79.5 g

First, we shall write the balanced equation for the reaction, This is given below:

2Cu + O₂ -> 2CuO

Now, we shall determine the mass of CuO formed from the reaction. Details below:

From the balanced equation above,

127.1 g of Cu reacted to form 159.1 g of CuO

Therefore,

63.5 g of Cu will react to form = (63.5 × 159.1) / 127.1 = 79.5 g of CuO

Thus, the mass of CuO formed is 79.5 g

Learn more about mass produced:

https://brainly.com/question/9526265

#SPJ1

The compound shown has the IUPAC name O Macmillan Learning. -3-ethyl-2,2-dimethyl-hexane Incorrect.

Explanation and response: Because it implies that there's methyl groups on carbons number one and sixth of the parent carbon chain, the name — appears-dimethylhexane is incorrect. Because the name "hexane" implies that a parent atom chain only has six molecules long, the methyl groups are located at the ends of every molecule.

Hexane, commonly referred to as sextane, is an organic compound that belongs to the alkane class. They are acyclic branched as well unbranched hydrocarbons with the standard structure CnH2n+2, and thus entirely composed of hydrogen and saturated oxygen atoms. Hexane is a colorless, clear liquid.

To know more about dimethylhexane visit :

https://brainly.com/question/30438544

#SPJ1

If 355 mL of 0.325 M Pb(NO)₂ (molar mass 331.2 g/mol) is added to 255 mL of 0.225 M K₃PO₄, (molar mass 212.27 g/m), 2.57 grams of Pb(PO₄)₂ (molar mass 811.54 g/mol) precipitate will be formed.[tex]\frac{355ml * 0.325M}{331.2 g/ml}[/tex]

The word "precipitation reaction" refers to a "chemical reaction occurring in an aqueous solution where two ionic bonds combine, yielding the formation of an insoluble salt." The insoluble salts produced by precipitation reactions are known as precipitates. The precipitate, a solid type of residue, is formed during precipitation reactions, which are frequently double displacement processes. When two or more solutions with different salt concentrations are combined, these reactions lead to the formation of insoluble salts that precipitate out of the solution.

One of the best examples of a precipitation reaction is the chemical interaction between potassium chloride and silver nitrate, which results in the precipitation of solid silver chloride. The insoluble salt is a result of the precipitation reaction.

The number of grams of Pb(PO4)2 precipitate that is formed can be calculated using the following equation:

Moles Pb(NO₃)₂ x Molar Mass Pb(PO₄)₂ / Moles K₃PO₄ = Grams of Pb(PO₄)₂

So the calculation is:

[tex]\frac{355ml * 0.325M}{331.2 g/ml}[/tex] x [tex]\frac{811.54g/mol}{255ml * 212.27g/mol}[/tex]) = 2.57 g Pb(PO₄)₂

Therefore, 2.57 g of Pb(PO₄)₂will be formed when 355 mL of 0.325 M Pb(NO₃)₂ and 255 mL of 0.225 M K₃PO₄ is mixed.

To know more about ionic bonds, visit:

https://brainly.com/question/11527546

#SPJ1

The pH of the student's stomach acid can affect the egg salad sandwich once inside the student's body in several ways. When the sandwich enters the stomach, the hydrochloric acid (HCl) present in the stomach acid starts to break down the proteins and other components of the sandwich.

The optimal pH range for the activity of the digestive enzyme pepsin, which breaks down protein, is between pH 1.5 and 2.5, so the acidic environment of the stomach acid is necessary for proper digestion of the sandwich. Additionally, the acidic environment of the stomach can denature and break down any harmful bacteria that might be present in the sandwich, reducing the risk of foodborne illness.

To know more about hydrochloric acid, here

brainly.com/question/15231576

#SPJ1

--The complete Question is, How does the pH of the student's stomach acid affect the egg salad sandwich once inside the student's body? --

a. On introducing 12g of HCl, 0.047 moles of sodium chloride are produced and b. On introducing 2.1 moles of sodium dichromate, 4.2 moles of chromium (III) chloride are produced.

Number of moles = Mass of the molecule (in grams) / Molar mass of the molecule (in grams per mole)

a. To solve this problem, we need to balance the chemical equation first:

Na₂Cr₂O7 + 14HCl → 2CrCl₃ + 2NaCl + 7Cl₂ + 7H₂O

The balanced equation shows that for every 14 moles of HCl, 2 moles of NaCl are produced.

So, to find the number of moles of NaCl produced from 12g of HCl, we first need to convert grams to moles using the molar mass of HCl.

Molar mass of HCl = 1.008 + 35.453 = 36.461 g/mol

Number of moles of HCl = mass / molar mass = 12g / 36.461 g/mol = 0.329 mol

Now, we can use the mole ratio from the balanced equation to find the number of moles of NaCl produced:

2 moles NaCl / 14 moles HCl * 0.329 mol HCl = 0.047 moles NaCl

Therefore, 0.047 moles of sodium chloride are produced.

b. Using the balanced equation from part a, we can see that the mole ratio between sodium dichromate and chromium (III) chloride is 1:2.

So, if 2.1 moles of sodium dichromate are introduced, we can find the number of moles of chromium (III) chloride produced by multiplying the number of moles of sodium dichromate by the mole ratio:

2.1 moles Na₂Cr₂O₇ * 2 moles CrCl₃ / 1 mole Na₂Cr₂O₇ = 4.2 moles CrCl₃

Therefore, 4.2 moles of chromium (III) chloride are produced.

Learn more about moles here:

https://brainly.com/question/26416088

#SPJ1