How many grams of agcl would be needed to make a 4. 0 m solution with a volume of 0. 75 l?

20 g of [tex]FeSO_4[/tex] contains [tex]7.94 \times 10^{22}[/tex] ions of [tex]Fe^2^+[/tex]

A mole is a unit to measure an amount of any substance which contains as many elementary particles as there in 12 g of Carbon 12.

A mole contains  [tex]6.02214 \times 10^{23}[/tex] particles and this fixed number is called Avogadro’s number.

No. of moles is given by,

[tex]n =\frac{m}{M}[/tex]

where m = Given mass in grams

M = Molar mass

Here,

[tex]FeSO_4 \rightarrow Fe^2^+ + SO_4^2^-[/tex]

No. of moles of  [tex]FeSO_4[/tex]  = [tex]\frac{20g}{151.9gmol^-^1}[/tex] = 0.132 moles

No. of molecules of  [tex]FeSO_4[/tex] = 0.132 x 6.022 x [tex]10^2^3[/tex] = 7.94 x [tex]10^2^2[/tex]

No. of molecules of  [tex]FeSO_4[/tex] = no. of ions of [tex]Fe^2^+[/tex] = no of ions of [tex]SO_4^2^-[/tex]

Thus, no. of ions  [tex]Fe^2^+[/tex] in 20 g of  [tex]FeSO_4[/tex]  is 7.94 x [tex]10^2^2[/tex]

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If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as mitotic death.

Hence, Option C is correct answer.

Ionizing radiation is a form of energy which is released by atoms that travels in the form of electromagnetic waves.

Examples: Heat or light from the Sun.

Radiation damage to the cell death occurs when cells to attempt to divide with the damaged DNA.

Thus from the above conclusion we can say that If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as mitotic death.

Hence, Option C is correct answer.

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Disclaimer: The question was given incomplete on the portal. Here is the complete question.

Question: If ionizing radiation interacts with a human cell, causing it to die after one or more divisions, it is classified as

(A) interference of function

(B) mitotic delay

(C) mitotic death

(D) reproductive death

If 2. 0 x 1023 argon {Ar) atoms strike 4. 0  [tex]cm^{2}[/tex]  of wall per second at a 90° angle to the wall when moving with a speed of 45,000  [tex]cm^{-1}[/tex].The pressure will be 0.295 atm.

The force delivered perpendicularly to an object's surface per unit area across which that force would be dispersed is known as pressure. In comparison to the surrounding pressure, gauge pressure defines the pressure. The units was using to express pressure vary.

Calculation of force:

Force excerted by the Ar atoms, (F) = Change in momentum for one Ar atom 7 / unit time × number of atom

F = 2mv /1s × number of atoms.

Putting the given data in above equation.

F = 2 × 39.95 amu × 450 m/s/ 1s × 1.66 × [tex]10^{-27}[/tex] kg /amu × 2 × [tex]10^{23}[/tex] atom

F = 11.94 N

Now, pressure can be calculated by using the formula:

P = Force exerted /area

P = 11.94 N/ 4.0 [tex]cm^{2}[/tex] ×  [tex]cm^{2}[/tex]/ [tex]10^{-4} m^{2}[/tex]

P = 0.295 atm

Therefore, the pressure will be 0.295 atm.

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The volume of 5.0 m hcl is required to react completely with 3.00 g of magnesium is 20 L.

Mg + 2HCl -----MgCl2 + H2

Given,

Molar mass of Mg = 24g/mol

Mole = Given mass/ Molar mass

Mole= 3/24

= 0.125 mol

From the given equation we get to know that

Mol ratio of Mg and HCl is 1:2.

Therefore,

mol of HCl = (2/1) × mol of Mg

=2× 0.125

= 0.25

Molarity = m× V

= M/m

= 5/0.25

= 20L

Thus, we find that the volume of 5.0 m hcl is required to react completely with 3.00 g of magnesium is 20 L.

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If the volume of the container were increased to 4.0 L, more N₂ and H₂ would be produced (Option D)

This is simply defined as a state in a chemical system where there is no observable change in the properties of the system with time.

A French scientist postulated a principle which helps us to understand a chemical system in equilibrium.

The principle states as follow:

If a an external constraint such as change in temperature, pressure or concentration is imposed on a system in equilibrium, the equilibrium will shift so as to neutralize the effect.

From the principle given above, we can see that volume does not affect equilirium position.

However, from Boyle's law, we understood that pressure and volume are in invest relationship.

Thus, increasing volume simply means decreasing pressure.

A decrease in pressure will favors the side where there is an increase in volume.

Let us consider the equation from the question:

N₂(g) + 3H₂(g) <=> 2NH₃(g)

Thus, we can conclude that increasing the volume (i.e decreasing the pressure) of the reaction will favors the backward reaction, hence, more N₂ and H₂ would be produced.

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According to Coulomb's law of  electrostatic forces, as the charge of a body  increases, the force exerted also increases. Hence, The electric force between A and  B increases as the charge of A increases.

Coulomb's law states that, the electrostatic force between two charges is directly proportional to the magnitude of their charges and inversely proportional to the distance between them.

The mathematical expression for Coulomb's law is written as follows:

F = k q1 q2/r²

where, q1 and q2 be the charges r be the distance between them, k is the proportionality constant.

Therefore, as the charge of A increases, irrespective whether the force is attractive or repelling, the electric force between them A and B increases.

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16.25 ml NaOH was used for the titration.

"The process of calculating the quantity of a material A by adding measured increments of substance B, the titrant, with which it reacts until exact chemical equivalency is obtained (the equivalence point)" is the definition of titration.

A titration is a method for figuring out the concentration of an unknown solution by using a solution with a known concentration. Until the reaction is finished, the titrant (the known solution) is typically added from a buret to a known volume of the analyte (the unknown solution).

0. 010 m NaOH is the titrant (in the buret).

The initial buret reading is 2. 45 ml

The final buret reading is 18. 70 ml

The volume of NaOH = 18.70ml - 2.45 ml

                                    = 16.25 ml

Therefore, 16.25 ml NaOH was used for the titration.

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1. The molecular formula of the compound is C₆H₃₆O₁₂

2. The molecular formula of the compound is N₂H₄O₂

3 The empirical formula and molecular formula of the compound are: C₂H₃ and C₄H₆

4. The empirical formula of the compound is C₃H₆O

5. The empirical formula of the compound is ZrSiO₄

Molecular formula = empirical × n = molar mass

[CH₆O₂]ₙ = 300

[12 + (6×1) + (16×2)]ₙ = 300

50n = 300

Divide both side by 74

n = 300 / 50

n = 6

Molecular formula = [CH₆O₂]ₙ

Molecular formula = [CH₆O₂]₆

Molecular formula = C₆H₃₆O₁₂

Molecular formula = empirical × n = molar mass

[NH₂O]ₙ = 60

[14 + (2×1) + 16]ₙ = 60

32n = 60

Divide both side by 32

n = 60 / 32

n = 2

Molecular formula = [NH₂O]ₙ

Molecular formula = [NH₂O]₂

Molecular formula = N₂H₄O₂

We'll begin by obtaining the empirical formula. This is illustrated below:

Divide by their molar mass

C = 88.9 / 12 = 7.4

H = 11.1 / 1 = 11.1

Divide by the smallest

C = 7.4 / 7.4 = 1

H = 11.1 / 7.4 = 3/2

Multiply by 2 to express in whole number

C = 1 × 2 = 2

H = 3/2 × 2 = 3

Thus, the empirical formula of the compound is C₂H₃

Finally, we shall determine the molecular formula of the compound. This is illustrated below:

Molecular formula = empirical × n = molar mass

[C₂H₃]ₙ = 75.16

[(12×2) + (3×1)]ₙ = 54

27n = 54

Divide both side by 27

n = 54 / 27

n = 2

Molecular formula = [C₂H₃]ₙ

Molecular formula = [C₂H₃]₂

Molecular formula = C₄H₆

Divide by their molar mass

C = 62.07 / 12 = 5.1725

H = 10.34 / 1 = 10.34

O = 27.59 / 16 = 1.724

Divide by the smallest

C = 5.1725 / 1.724 = 3

H = 10.34 / 1.724 = 6

O = 1.724 / 1.724 = 1

Thus, the empirical formula of the compound is C₃H₆O

Divide by their molar mass

Zr = 49.76 / 91 = 0.547

Si = 15.32 / 28 = 0.547

O = 34.91 / 16 = 2.182

Divide by the smallest

Zr = 0.547 / 0.547 = 1

Si = 0.547 / 0.547 = 1

O = 2.182 / 0.547 = 4

Thus, the empirical formula of the compound is ZrSiO₄

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The pH of a 1. 0 l buffer prepared by adding 0. 100 moles of NaOH to 0. 250 moles of HF. ka for HF = 3. 5 × 10−4 is 3.86.

The Henderson hasselbalch equation can be expressed as

pH = pKa + log [base]/ [acid]

Firstly we will calculate the value of pKa

pKa = -logKa

Given,

Ka = 3. 5 × 10−4)

pKa = -log(3. 5 × 10−4)

pKa = 3.46

Now, we will calculate the value of log [base]/ [acid]

Given,

[base] = 0.10m

[acid] = 0.25m

log [base]/ [acid] = log(0.10/0.25)

= 0.4

Putting the values in handerson hasselbalch equation,

pH = 3.46+0.4

= 3.86

Thus, we find that the value of pH of a 1. 0 l buffer prepared by adding 0. 100 moles of NaOH to 0. 250 moles of HF is 3.86.

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A single replacement or displacement reaction occurs when one ingredient in a compound replaces another. Only another metal can replace a less active one; a metal can only displace another metal, and a non-metal can only displace another non-metal.

The tendency of the element to lose electrons is what makes it metallic. Due to their bigger sizes and propensity to lose electrons as size, the number of shells, and nuclear force of attraction rise, the most active metals are found on the left side of the periodic table.

The reaction in which the more reactive element displaces the less reactive element is known as the displacement reaction.

When we combine an active metal with HCl, the reaction is as follows:

We are taking sodium, Na which is the most active metal. It will replace H in HCl because it is more reactive than H.

                       2Na + 2HCl → 2NaCl + H₂

Three ways to recognize if a single displacement reaction has taken place:

1. Color change

2. Formation of bubbles (a gas)

3. Formation of a precipitate

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Answer:

C.) One mole of mercury

Explanation:

You can determine which has the greatest mass by identifying each of their atomic masses. The atomic mass represents the mass of an element per 1 mole.

Gold (Au): 196.97 g/mol

Mercury (Hg): 200.59 g/mol

Barium (Ba): 137.33 g/mol

In this case, one mole of mercury has the greatest mass.

Mendeleev positioned elements in the periodic table in increasing order of their atomic numbers, such that elements having identical chemical properties and characteristics plunge into the same group.

What is Mendeleev's periodic table called?

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The molarity of the solution is 0.43 M

What is molar concentration or molarity?

Calculation of molarity:

Initially, we must change grams of hydrogen chloride into moles.

Moles of solute per L of solution are known as molarity.

                        M = n/v

where, M=molar concentration,

n = moles of solute,

v= litres of solution

We must divide by the molecular mass to go from grams to moles.

5.20 g of HCl * (1 mole/36.46 g of HCl) = 1.14 moles of HCl

3.0 L x 0.143 moles = 0.429 M HCl ≈ 0.43 M HCl

Therefore it is concluded from the above solution that the molarity of the solution is 0.43 M HCl.

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HF and NaF - If the right concentrations of aqueous solutions are present, they can produce a buffer solution.

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Answer:

NH₄CN,  NH₄IO₃,  Fe(CN)₃,  Fe(IO₃)₃

Explanation:

Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.

1.) NH₄CN

-----> NH₄⁺ and CN⁻

-----> +1 + (-1) = 0

2.) NH₄IO₃

-----> NH₄⁺ and IO₃⁻

-----> +1 + (-1) = 0

3.) Fe(CN)₃

-----> Fe³⁺ and CN⁻

-----> +3 + (-1) + (-1) + (-1) = 0

4.) Fe(IO₃)₃

-----> Fe³⁺ and IO₃⁻

-----> +3 + (-1) + (-1) + (-1) = 0

Answer:

A

Explanation:

Isotopes are atoms of the same element with the same number of protons and electrons but different numbers of neutrons.

Isotopes can also be defined as atoms of the same element with the same atomic number but different mass numbers e.g isotopes of chlorine, oxygen and so on.Oxygen for instance has three isotopes with the same atomic number,8 and different mass numbers,16,17 and 18.

The volume in the final system that was initially enclosed in a 12.3 liter cylinder with a moveable piston at 300 K and 2.0 atm is 36.9L.

The volume of a given amount of gas can be calculated by using the combined gas law formula as follows;

P1V1/T1 = P2V2/T2

Where;

According to this question, 1.0 mole of a gas is enclosed in a 12.3 liter cylinder with a moveable piston at 300 K and 2.0 atm.

However, half of the gas is removed, leaving 0.50 mole in the cylinder and the system is warmed to 900 K. The volume in the final system can be calculated as follows:

2 × 12.3/300 = 2 × V2/900

0.082 = 2V2/900

73.8 = 2V2

V2 = 73.8 ÷ 2

V2 = 36.9L

Therefore, the volume in the final system that was initially enclosed in a 12.3 liter cylinder with a moveable piston at 300 K and 2.0 atm is 36.9L.

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Answer:

Explanation:

it's 18.45, my sister just got the guestion right! hope it helps :)

Answer:

[tex]\frac{1 kJ}{1,000 J}[/tex]  ·  [tex]\frac{1,000 mmol}{1 mol}[/tex]

Explanation:

The final answer has a different set of units. In particular, millimoles (mmol) changes to moles (mol) and joules (J) changes to kilojoules (kJ). To make this change, you need to multiply the first value by proportions.

When writing these proportions, it is important that they are arranged in a way that allows for the cancellation of units. For instance, since J is located in the numerator, it must be located in the denominator of the conversion. Furthermore, since mmol is located in the denominator, it must be located in the numerator of the conversion.

Proportions:

1,000 J = 1 kJ

1,000 mmol = 1 mol

The full expression:

As you can see, the old units cancel out and you are left with kJ in the numerator and mol in the denominator.

The pH of the diprotic acid H2Y is =

6.15 × 10-17

A diprotic acid is a type of acid that contains two hydrogen atoms in its molecules which has the ability to be replaced when involved in a chemical reaction.

A weak diprotic acid is the type of acid that yields hydronium ions and bicarbonate ions in small amounts when involved in a chemical reaction.

The pH is defined as the degree of how acidic or how basic a substance is when measured against a scale.

The Ka1 of the weak diprotic acid = 6.9x10-5

The Ka2 of the weak diprotic acid = 5.4x10-12

Using the formula;

pH = (pKa1 + pKa2)/2

pH = (6.9x10-5 + 5.4x10-12)/2

pH= 12.3 ×10-5×10-12

pH= 12.3 × 10-17/2

pH= 6.15 × 10-17

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The pH of the buffer made by combining Nitrous acid and Sodium Nitrite will be 3.06.

pH can be defined as the medium of expressing the acidity or alkalinity of any solution. It is the potential of hydrogen atoms.

Buffers are the solutions that resist any change in the pH when an acid or base is added to them.

According to the question,

0.150 M nitrous acid (HNO₂) = 45 ml

0.175 M sodium nitrate (NO₂⁻)= 20 ml

Kₐ of nitrous acid (HNO₂) = 4.5 × 10⁻⁴

Total volume of buffer = 45 ml + 20 ml = 65 ml

Concentration of HNO₂ = (45) (0.150) / 65 = 0.103 M

Concentration of NO₂⁻ = (20) (0.175) / 65 = 0.054 M

                     HNO₂  ⇒ H⁺ + NO₂⁻

Initial :          0.103        0     0.054

Change:         -x             +x       +x

Equilibrium: 0.103-x        x       0.054+x

Kₐ = x(0.054+x) / 0.103-x = 0.054x / 0.103 = 0.524x

Also, Kₐ = 4.5 × 10⁻⁴

Therefore, 4.5 × 10⁻⁴ = 0.524x

                              x = 8.58 × 10⁻⁴ M

H⁺ = x = 8.58 × 10⁻⁴ M = 8.6 × 10⁻⁴ M

Therefore, pH = -log ( 8.6 × 10⁻⁴ M)

                 pH = 3.06

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Answer:

The correct answer is D. Stating the point of the text in a few brief statements.

Explanation:

The whole idea of a summary is to effectively restate the text by only focusing on the main points.

Hope this helps:) Good luck!

At 2000 K, if the partial pressures of an equilibrium mixture of H2S, H2, and S are 0.0151 , 0.0472 , and 0.0352 atm, respectively, then the value of the equilibrium constant Kp at 2000 K is 9.089.

The pressure that is exerted by one among the mixture of gases if it occupies the same volume on its own is known as Partial pressure.

As we know that,

Kp is the constant of a certain reaction at equilibrium.

For the given chemical reaction:

H2 +S -------H2S

The expression of Kp for above equation follows:

Kp = p(H2S) /{p(H2) ×p(S)}

where,

p(H2S) is the partial pressure of H2S = 0.0151atm

p(H2) is the partial pressure of H2 = 0.0472atm

p(S) is the partial pressure of S = 0.0352 atm

Kp = 0.0151/(0.0472 × 0.0352)

Kp = 0.0151/0.00166144

Kp = 9.089

Thus, we find that the value of equilibrium constant Kp at 2000K is 9.089.

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The given description details the methods that are used in Mixing Zinc Phosphate for Permanent Cementation,

The complete description contains the following details:

Personal protective equipment (PPE) is required for the healthcare team, and the student is required to identify and prepare the instrument setup.

Equipment and Supplies

This refers to the use of cement to create a building structure that is used to keep things in place.

Hence, we can see that the Procedural Steps include:

Preparing the Mix

1. Dispense the powder toward one end of the slab and the liquid toward the opposite end.

2. Recap the containers.PURPOSE These materials can be affected by prolonged exposure to the humidity.

3. Divide the powder into small increments as directed by the manufacturer.

4. Incorporate each powder increment into the liquid.NOTE When increment sizes vary, smaller increments are used first. Mixing time per increment also varies; the time is approximately 15 to 20 seconds.

5. Spatulate the mix thoroughly, using broad strokes or a figure-8 movement over a large area of the slab.PURPOSE This aids in dissipating the heat generated during mixing.

6. Test material for appropriate cementation consistency. The cement should string up and break about 1 inch from the slab. Total mixing time is approximately 1 to 2 minutes

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Number of moles of KOH present in solution is 3.75.

The term "mole" refers to a mole's atomic mass, which is expressed in grams. A mole is an element's gram-atomic mass, or mass.

The mole idea equates the mass of a single atom or molecule (measured in a.m.u.) to the mass (measured in grams) of a large collection of equivalent molecules.

To calculate moles of potassium hydroxide in 750 ml of 5.00 m of KOH solution -

Mathematically molarity  is expressed as,

Molarity =no. of molecules of solute/volume of solution

Given: Molarity of solution = 5.00 M

Volume of solution = 750 ml = 0.750 l

∴ 5 = no. of moles/0.750

∴ number of moles = 3.75

Hence, number of moles of KOH present in solution is 3.75.

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Answer:

I think the answer is c I'm not sure but probaly dont put c if your. ot sure try looking up the answers that helps me alot through my word

The volume of H₂ gas produced is approximately 90 L, Option (b) is correct.

To find the volume of H₂ gas produced when 60 L of ammonia (NH₃) is decomposed, we use the balanced chemical equation for the decomposition of ammonia:

2 NH₃(g) → 3 H₂(g) + N₂(g)

According to the equation, 2 moles of ammonia produce 3 moles of hydrogen gas (H₂). At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 liters.

First, calculate the moles of ammonia present in 60 L:

Moles of NH₃ = Volume / Molar Volume at STP = 60 L / 22.4 L/mol ≈ 2.68 moles

Using the stoichiometric ratio, 3 moles of H₂ are produced from 2 moles of NH₃. So, we can calculate the moles of H₂ produced:

Moles of H₂ = (3/2) * Moles of NH₃ ≈ (3/2) * 2.68 moles ≈ 4.02 moles

Now, find the volume of H₂ gas produced:

Volume of H₂ = Moles of H₂ * Molar Volume at STP = 4.02 moles * 22.4 L/mol ≈ 89.9 L

Rounded to one decimal place, the volume of H₂ gas produced is approximately 90 L, which corresponds to option b).

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Each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.

The gas exchange refers to the process by which oxygen is absorbed by red blood cells and carbon dioxide is removed through the respiratory system.

The process of gas exchange is carried out due to the differential diffusion rates of gases in the bloodstream (O2 and CO2), which facilitates the transference of these gases.

In conclusion, each gas dissolved in the blood diffuses between the blood and its surroundings based on differences in the partial pressure and diffusion occurs until equilibrium is reached.

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The molality of the given solution is 5.67 mol/kg

You may calculate the molality of a solution to find out how many moles of solute you obtain per kilogram of solvent. Mol/kg is a typical molality measurement unit in chemistry. One molal is another way to refer to a solution with a concentration of 1 mol/kg. Molar mass must be represented in kg/mol rather than the more common g/mol or kg/kmol when using the unit mol/kg. The formula is as follows:

Molality = [tex]\frac{moles of solute}{kilogram of solvent}[/tex]

First we need to find moles of solute ;

moles of solutes = [tex]\frac{given mass}{molecular mass}[/tex]

moles = 125 / 80.0434

moles of solute = 1.56

Now, molality is ;

molality = 1.56 / 0.275

molality = 5.67 mol/kg

Therefore, The molality of the given solution is 5.67 mol/kg

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Answer:

1.16 moles CO₂

Explanation:

To find the moles of CO₂, you need to (1) convert grams C₈H₁₈ to moles (via the molar mass) and then (2) convert moles C₈H₁₈ to moles CO₂ (via the mole-to-mole ratio from equation coefficients). It is important that the conversions/ratios are arranged in a way that allows for the cancellation of units. The final answer should have 3 significant figures like the given value.

Molar Mass (C₈H₁₈): 8(12.011 g/mol) + 18(1.008 g/mol)

Molar Mass (C₈H₁₈): 114.232 g/mol

2 C₈H₁₈ + 25 O₂ -----> 16 CO₂ + 18 H₂O
^                                    ^

16.6 g C₈H₁₈            1 mole            16 moles CO₂          
--------------------  x  -----------------  x  -------------------------  = 1.16 moles CO₂  
                              114.232 g          2 moles C₈H₁₈