Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars a day. The actual process requires water, but a simplified equation is 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s) ΔH = -1.65×10³kJ
(b) How much rust forms when 4.85X10³ kJ of heat is released?
Answers
The value of ∆H when 0.250kg of iron rusts is -1.846 × 10³kJ.
The rust forms when 4.85X10³ kJ of heat is released is 888.916 g.
Chemical reaction:4 Fe + 3O2 ------ 2Fe2O3
∆H = -1.65×10³kJ
A) Given,
mass of iron = 0.250kg = 250 g
Calculation of number of molesmoles = given mass/ molar mass
= 250/ 55.85 g/mol.
= 4.476 mol
As we know that,
For the rusting of 4 moles of Fe, ∆H = -1.65×10³kJ
For the rusting of 4.476 moles of Fe ∆H required can be calculated as
-1.65×10³kJ × 4.476 mol/ 4mol
∆H required = -1.846 × 10³kJ
Now,
when 2 mol of Fe2O3 formed, ∆H = - 1.65×10³kJ
It can be said that,
-1.65×10³kJ energy released when 2 mol of Fe2O3 formed
So, -4.6 × 10³kJ energy released when 2 mol of Fe2O3 formed
= 2 × -4.6 × 10³kJ / -1.65×10³kJ
= 5.57 mol of Fe2O3 formed
Now,
mass of Fe2O3 formed = 5.57 mol × 159.59 g/mol
= 888.916 g
Thus, we calculated that the rust forms when 4.85X10³ kJ of heat is released is 888.916 g. and the value of ∆H when 0.250kg of iron rusts is -1.846 × 10³kJ.
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DISCLAIMER:
The given question is incomplete. Below is the complete question
QUESTION:
Deterioration of buildings, bridges, and other structures through the rusting of iron costs millions of dollars a day. The actual process requires water, but a simplified equation is 4Fe(s) + 3O₂(g) → 2Fe₂O₃(s) ΔH = -1.65×10³kJ
a) What is the ∆H when 0.250kg iron rusts.
(b) How much rust forms when 4.85X10³ kJ of heat is released?
Related Questions
for the sulfate ion drawn in the form where the central s atom bears a formal charge of 1, there are:
Answers
There are 4 oxygen atoms bonded to the central sulfur atom, each with a formal charge of -1. The overall charge of the sulfate ion is -2.
For the sulfate ion (SO₄²⁻) drawn with the central sulfur (S) atom bearing a formal charge of +1, there are:
- 4 oxygen (O) atoms surrounding the central sulfur atom
- A total formal charge of -2 on the ion, meaning the combined formal charges of the oxygen atoms must be -3
Please note that this representation of the sulfate ion is not the most common or stable form. Typically, the sulfur atom has a formal charge of 0, with two oxygen atoms having a single negative charge and two oxygen atoms having double bonds.
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Which of the following has the lowest percent Gold content by weight?
a. Au (NO3)3 b. Au (OH)3
d. AuPO3
c. AuF3
d. AuPO3
Answers
Answer:
The correct answer is (d) AuPO3 as it does not contain any gold in its chemical formula.
Explanation:
The correct answer is (d) AuPO3 as it does not contain any gold in its chemical formula.
(a) Au(NO3)3 contains 79.9% gold by weight
(b) Au(OH)3 contains 89.8% gold by weight
(c) AuF3 contains 69.5% gold by weight.
Answer:
The correct answer is option d. AuPO3.Gold content by weight:
a. Au (NO3)3 = 69.94%
b. Au (OH)3 = 89.07%
c. AuF3 = 69.96%
d. AuPO3 = 42.55%
AuPO3 has the lowest percent Gold content by weight, as only 42.55% of its weight is attributed to Gold.
Explanation:
The correct answer is option d. AuPO3.
AuPO3 has the lowest percent Gold content by weight, as only 42.55% of its weight is attributed to Gold. The other options, Au(NO3)3, Au(OH)3, and AuF3 have higher percent Gold content by weight than AuPO3.
what is the purpose of adding phenolphthalein to your erlenmeyer flask prior to starting a titration
Answers
Answer: The purpose of phenolphthalein indicator is to show pink color if the liquid in the flask is titration fully.
Explanation:
The purpose of adding phenolphthalein to your Erlenmeyer flask prior to starting a titration is to serve as an indicator for the endpoint of the titration.
What is titration?
Titration is a laboratory technique used to determine the concentration of a solution of a known volume by reacting it with a solution of known concentration or strength. A titration is a controlled chemical reaction that is conducted by slowly adding one solution to another until the chemical reaction is complete.
Phenolphthalein- Phenolphthalein is a commonly used indicator in acid-base titrations. The color of phenolphthalein changes depending on the pH of the solution being titrated. Phenolphthalein is pink in the presence of a base and colorless in the presence of an acid.
The purpose of adding phenolphthalein to the Erlenmeyer flask before starting a titration is to serve as an indicator for the endpoint of the titration. The endpoint of a titration is the point at which the reaction is complete.
When the reaction is complete, the color of the solution will change from pink to colorless, indicating that the solution has reached the endpoint of the titration.
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Sodium bicarbonate or beta-alanine used to improve anaerobic performances exert their effect by?
Answers
Sodium bicarbonate or beta-alanine used to improve anaerobic performances exert their effect on the slow rate of decrease of creatine phosphate.
Anaerobic means "with the air" and refers to the body's use of oxygen to produce energy. This typically includes exercises that last longer than 2 minutes. Continuous "steady state" exercise is done with aerobic exercise. Anaerobic means "without air" and refers to the body's ability to produce energy without using oxygen.
Examples of aerobic exercise include swimming laps, running, or cycling. Anaerobic exercise involves a rapid burst of energy and is performed with maximum effort in a short period of time. Examples include jumping, sprinting, and lifting heavy objects. "Walking is a great aerobic exercise. It's thought to be weight-bearing and good for bone strength and health," he says. Oftentimes, people feel unwell and want to lose weight and get fit, but think they need a gym membership to exercise.
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PLEASE HELP DUE TODAY!!!
List the liquid mixtures from most sense to least dense using evidence and reasoning:
1) 1/2 cup of water
2) 1/2 cup of water + 2 tablespoons of salt
3) 1/2 cup of water + 2 tablespoons of sugar
4) 1/2 cup of water + 2 tablespoons of flour
Answers
Answer: i beleive the answer is 1
Explanation:
What is a unit cell? Provide simple definition. (b) Sketch the body-centered cubic unit cell. (c) For the BCC unit cell, define the coordination number using a sketch. (d) Show the calculation (with all terms defined) for determining the atomic packing factor (APF) for the BCC unit cell (assume hard ball, spherical atoms).
Answers
A unit cell can be visualized as a building block that, when replicated in all directions, creates the entire crystal lattice. Unit cells can have different shapes, the most common types of unit cells include simple cubic, body-centered cubic, and face-centered cubic etc.
(a) Definition of a unit cell: A unit cell is the basic repeating unit of a crystal lattice. It represents the smallest portion of a crystal that, when stacked together, can generate the entire crystal structure.
(b) Sketch of a body-centered cubic (BCC) unit cell is represented in the image below. In the BCC unit cell, atoms are located at the eight corners of the cube and one atom is positioned at the center of the cube.
(c) Coordination number in a BCC unit cell: The coordination number is the number of nearest neighboring atoms surrounding a central atom. In a BCC unit cell, each atom is in contact with eight nearest neighboring atoms: one in the center of the unit cell and one at each of the eight corners.
(d) Calculation for the atomic packing factor (APF) of a BCC unit cell:
The APF is calculated as the volume occupied by the atoms in the unit cell divided by the total volume of the unit cell.
For a BCC unit cell, the APF can be calculated as follows:
APF = (Number of atoms in the unit cell * Volume of each atom) / Volume of the unit cell
In a BCC unit cell, there are two atoms (one at the center and one at the corner), and the volume of each atom can be approximated as (\(4/3\)) * π * \((radius)^3\). The volume of the unit cell can be calculated as the cube of the edge length.
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Give an example of a pair of isotopes of the same element. Explain how they are similar and how they are different.
Please help, no bots!
Answers
An example of a pair of isotopes of the same element is Hydrogen and Deuterium. They are similar because they have same atomic number and they are different because they have different mass number.
What is Hydrogen ?Hydrogen is a chemical element with the atomic number 1. It is represented with symbol H. Mass number of hydrogen is 1. Hydrogen belong to group 1. It belongs to period 1. Hydrogen is s-block element.
What is Deuterium ?Deuterium is isotope of hydrogen. The atomic of deuterium is 1. The mass number of deuterium is 2. It is also known as heavy hydrogen. It is represented as D or 2H.
Thus from the above conclusion we can say that a pair of isotopes of the same element is Hydrogen and Deuterium.
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Use linear algebra to balance the chemical equation: C7H₁6 +0₂ → CO₂ + H₂O. 20. Let V be the set of all vectors in ³ whose components sum to zero (e.g. (-5, 2, 3) is in the set V but (0, 0, 1) is not). Is V a subspace of R³2 Give compelling evidence either way. 15. (Determine the quadratic interpolant to the given data set using linear algebraic techniques. (The quadratic interpolant is a quadratic equation that best approximates the data set). {(6.667, 46.307), (4.567, 16.582), (3.333, 4.857)}
Answers
The balanced chemical equation is:
0.5C7H16 + O2 → 0.5CO2 + H2O
For balancing the chemical equation C7H16 + O2 → CO2 + H2O, we can use linear algebraic techniques. We need to determine the coefficients that balance the number of atoms on both sides of the equation.
Let's denote the coefficients for C7H16, O2, CO2, and H2O as a, b, c, and d, respectively.
The balanced chemical equation can be written as:
aC7H16 + bO2 → cCO2 + dH2O
To balance the carbon (C) atoms, we have:
7a = c (Equation 1)
To balance the hydrogen (H) atoms, we have:
16a = 2d (Equation 2)
To balance the oxygen (O) atoms, we have:
2b = 2c + d (Equation 3)
We have three equations (Equations 1, 2, and 3) and four unknowns (a, b, c, d). To solve this system of equations, we can write it in matrix form and find the solution using linear algebraic techniques.
The augmented matrix for the system of equations is:
[ 7 0 -1 0 | 0 ]
[ 0 0 0 -2 | 0 ]
[ 0 -2 2 -1 | 0 ]
By performing row operations to row-reduce the augmented matrix, we can obtain the solution:
[ 1 0 -0.5 0 ]
[ 0 1 -1 -0.5 ]
[ 0 0 0 0 ]
The solution to the system of equations is:
a = 0.5
b = 1
c = 0.5
d = 1
Putting the values of a,b,c, and d we get the balanced chemical equation as:
0.5C7H16 + O2 → 0.5CO2 + H2O
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Gerry is looking at salt under a powerful microscope and notices a crystalline structure. What can be known about
the salt sample that Gerry is looking at?
Answers
Answer:
The atoms are vibrating in place.
Explanation:
One of the properties of an ionic substance is the possession of a crystalline structure. As Gerry observed the salt under a microscope, he discovered that it has a crystalline structure. Crystalline salts are all ionic in nature, hence the salt observed by Gerry is an ionic salt.
Solids containing a definite crystalline structure always has their particles vibrating in place. This is immediately evident as Gerry looks at the salt through a microscope.
Answer:
D.The atoms are vibrating in place
Explanation:
Lizzie is pushing Alex on a scooter. Lizzie is pushing with 75 N of force to the left,
and Alex is helping with 20 N to the left. What is the net force on the scooter?*
Answers
Answer:
95 N
Explanation:
they are both pushing in the same direction so you simply add
75+20=95
What is the percentage yield when 60kg of ammonia is produced from 60kg of hydrogen?
Answers
Answer:
17.6%
Explanation:
%age yield is = actual yield /percentage yield ^100
at a certain temperature, the value of the equilibrium constant keq, for the reaction represented above is 2.0 x 10^5. what is the value of keq for the reverse reaction at the same temperature
Answers
The equilibrium constant for the reverse reaction is equal to the inverse of the equilibrium constant for the forward reaction. So, if the equilibrium constant for the forward reaction is 2.0 x 10^5, then the equilibrium constant for the reverse reaction is 1/(2.0 x 10^5) = 5.0 x 10^-6.
In other words, the reverse reaction is much less likely to occur than the forward reaction. This is because the equilibrium constant is a measure of the relative concentrations of the products and reactants at equilibrium. A large equilibrium constant indicates that the products are much more concentrated than the reactants, while a small equilibrium constant indicates that the reactants are much more concentrated than the products.
In this case, the equilibrium constant is very large, which means that the products are much more concentrated than the reactants at equilibrium. Therefore, the reverse reaction is much less likely to occur than the forward reaction.
Here is a more detailed explanation of how to calculate the equilibrium constant for the reverse reaction:
The equilibrium constant for the forward reaction is calculated by taking the product of the concentrations of the products and dividing by the product of the concentrations of the reactants, each raised to the power of its stoichiometric coefficient.
The equilibrium constant for the reverse reaction is calculated by taking the reciprocal of the equilibrium constant for the forward reaction.
In this case,
The equilibrium constant for the forward reaction is 2.0 x 10^5.
The reciprocal of 2.0 x 10^5 is 5.0 x 10^-6.
Therefore,
the equilibrium constant for the reverse reaction is 5.0 x 10^-6.
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An object has 15 grams of atoms and displaces 2.5 mL of water when dropped into a cylinder. What is the objects density... HELP IM IN CLASS RN AND I NEED ANSWERS ASAP, grades are due in couple hours
Answers
Answer:
6g/mL
Explanation:
The density, which is the mass per unit volume of an object, can be calculated using the formula;
D= m/v
Where; D = density (g/mL)
M = mass of substance (g)
V = volume (mL)
In this question, the object's mass = 15g, volume of water= 2.5 mL, d =?
Therefore,
Density = 15/2.5
Density = 6 g/mL
The object's density is 6g/mL
1. For Part 1, describe the changes in the colors of the well, if any, as you go from well 1 to well 9—that is, as you go from the well with the least copper(Il) nitrate to the well with the most copper(Il) nitrate. Which wells had the most distinct precipitate?
For Part 2, describe the changes in the colors of the well, if any, as you go from well 1 to well 9—that is, as you go from the well with the least iron(lI) sulfate to the well with the most iron (Il) sulfate. Which wells had the most distinct precipitate?
For Part 3, describe the changes in the colors of the well, if any, as you go from well 1 to well 9—that is, as you go from the well with the least iron(I|I) nitrate to the well with the most iron(I|I) nitrate. Which wells had the most distinct precipitate?
2. Below are the balanced equations for the reactions in
Parts 1–3. Review the results of your experiments and look closely over the mole ratios of the chemical reactions. Do your experiments reflect the stoichiometric, molar amounts indicated by the reactions? Discuss this using the evidence from your experiments.
Cu(NO3)2 (aq) + 2NaOH(aq) —> Cu(OH)2 (s) + 2NaNO3 (aq) Note: Cu(OH)2 is a blue precipitate.
FeSO4 (aq) + 2NaOH(aq) —> Fe(OH)2 (s) + Na2SO4 (aq) Note: Fe(OH)2 is a dark green precipitate.
Fe(NO3)3 (aq) + 3NaOH(aq) —> Fe(OH)3 (s) + 3NaNO3 (aq)
Note: Fe(OH)3 is a red-
orange precipitate.
PLEASE I NEED THESE ANSWERS IMMEDIATELY!!! This is 20 points!!! Please no wrong answers.
Answers
The precipitates that were refereed to in the question are the solid products of the reaction.
What is a precipitate in a chemical reaction?A precipitate is a solid that forms out of a solution during a chemical reaction. It occurs when certain components of the solution combine to form an insoluble compound that no longer remains in solution, but instead forms a separate solid phase.
The solid that forms is called the precipitate. The formation of a precipitate is often an indication that a chemical reaction has taken place. It can be observed as a change in color, turbidity or the formation of a solid in the reaction mixture.
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How are traits inherited?
Please explain thoroughly
Answers
inherited traits are passed from parent to offspring according to the rules of Mendelian genetics. Most traits are not strictly determined by genes, but rather are influenced by both genes and environment
if you have ever looked around you and thought about the way things work, you have made a(n) ____________________.
Answers
Answer:
observation
Explanation:
a vehicle accelerates with 0.4 m/s. calculate tue time taken by the vehicle to increase its speed from 20m/s to 40m/s.
Answers
Answer:
\(\huge\boxed{\sf t = 50 \ seconds}\)
Explanation:
Given data:Acceleration = a = 0.4 m/s²
Initial Speed = \(V_i\) = 20 m/s
Final Speed = \(V_f\) = 40 m/s
Required:Time = t = ?
Formula:\(\displaystyle a =\frac{V_f-V_i}{t}\)
Solution:Rearranging formula for t
\(\displaystyle t =\frac{V_f-V_i}{a} \\\\t = \frac{40-20}{0.4} \\\\t = \frac{20}{0.4} \\\\\boxed{t = 50 \ seconds}\\\\\rule[225]{225}{2}\)
Answer:
50 seconds
Explanation:
Equation used :
v = u + at
Given :
⇒ a = 0.4 m/s²
⇒ u = 20 m/s
⇒ v = 40 m/s
Solving :
⇒ 40 = 20 + 0.4t
⇒ 0.4t = 20
⇒ t = 20/0.4
⇒ t = 50 seconds
What chemical reaction has almost the same products and reactants as cellular respiration but reversed?.
Answers
Answer: Rusting Photosynthesis
Explanation: Hope this helps
it requires 2.10 moles of ammonia in a particular chemical reaction. what volume of ammonia would these be if measured at 760 mmHg and 0.00 c
Answers
The volume of ammonia would be 6.27 L.
The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behaviour of many gases under many conditions, although it has several limitations. The ideal gas equation can be written as
PV = nRT
where,
P = Pressure
V = Volume
T = Temperature
n = number of moles
Given,
moles of ammonia = 2.10 moles
Pressure = 760 mm Hg
Temperature = 273K
PV = nRT
760 × V = 2.1 × 8.314 × 273
V = 6.27 L
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Identify the period, group, and valence electrons block of each element.
Problem:
[Ne] 3s² 3p5
P-5, G-17, p
P-6, G-6, d
P-7, no group, f
P-3, G-17, p
P-3, G-14, p
![Identify the period, group, and valence electrons block of each element. Problem:[Ne] 3s 3p5P-5, G-17,](https://i5t5.c14.e2-1.dev/h-images-qa/contents/attachments/JHm6xgdJy7ki171t2AXUBNdnVS7ws8P0.png)
Answers
The period, group, and valence electrons block of the given element with the electronic configuration [Ne] 3s² 3p5 is Period 3, Group 7, p-block.
What are the periods and groups in the Periodic Table?The periods in the periodic table are the horizontal rows found in the periodic table.
There are 7 periods in the Periodic Table.
Elements in the same period have the same number of electron shells.
The groups in the periodic table are the vertical columns found in the periodic table.
There are 18 periods in the Periodic Table.
Elements in the same group have the same number of valence electrons.
The electronic configuration of atoms can be used to identify the group and period each element belongs to.
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Can someone help me for one of these questions it would mean a lot pls
Answers
Answer:
Hope this helps you
Identify the correct balanced equation for the combustion of butene (C4H8).
C4H8(g)→4H2(g)+4C(s)
C4H8(g)+6O2(g)→4H2O(g)+4CO2(g)
C4H8(g)+4O2(g)→4H2O(g)+4CO2(g)
C4H8(g)+6O2(g)→4H2CO3(g)
Answers
The correct answer is C4H8(g)+6O2(g)→4H2O(g)+4CO2(g)
The correct balanced equation for the combustion of butene (C4H8) is:
C4H8(g) + 6O2(g) → 4CO2(g) + 4H2O(g)
We have identified this equation, as it represents the complete combustion of butene, where it reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O).
This equation shows that when one molecule of butene (C4H8) reacts with six molecules of oxygen (O2).
It produces four molecules of carbon dioxide (CO2) and four molecules of water (H2O).
The equation is balanced because it has the same number of atoms of each element on both sides of the equation.
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Calculate the minimum of oxygen required for the complete combustion of a mixture of 20cm³ of CO (Carbon Monoxide) and 20cm³ of H₂ (Hydrogen gas)
Answers
The minimum amount of oxygen required for the complete combustion of 20cm³ of CO and 20cm³ of H₂ would be 20.16 cm³ at STP.
Stoichiometric problemThe balanced chemical equation for the combustion of CO and H2 is:
CO + 1/2O2 → CO2
H2 + 1/2O2 → H2O
From the equation, we can see that one mole of CO requires 1/2 mole of O2, while one mole of H2 requires 1/2 mole of O2.
20 cm³ CO at STP = 20/24000 = 0.00083 moles CO20 cm³ H2 at STP = 20/24000 = 0.00083 moles H2From the balanced equation, we can see that each mole of CO requires 1/2 mole of O2, while each mole of H2 requires 1/2 mole of O2.
Therefore, we need 0.00083/2 = 0.00042 moles of O2 for the combustion of CO and the same amount for the combustion of H2.
The total amount of O2 required is the sum of the amounts needed for each reactant:
Total O2 required = 0.00042 + 0.00042 = 0.00084 moles0.00084 moles O2 × 24000 cm³/mol = 20.16 cm³ O2Therefore, the minimum amount of oxygen required for the complete combustion of 20 cm³ of CO and 20 cm³ of H2 is approximately 20.16 cm³ at STP.
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how many grams are in 4.63 ×1024 molecules of CCl4
Answers
Answer:
m =1,182.8g
Explanation:
there you go
Jenna took an open bowl of leftover mashed potatoes from the refrigerator and noticed a difference in smell. She determined that chemical changes occurred since the potatoes were first placed there.
Which observations most likely led to Jenna’s conclusion?
Answers
Answer:
The change in smell
Explanation:
chemical reactions ccan lead to change in temperature, change in color and also change in smell
A conclusion drawn through reasoning is called an
evaluation
inference
oversight
understanding
Answers
Pls help I will give u points pls
Answers
Answer:
i think D
Explanation:
where is the atomic symbol located
Answers
Atoms are made up of protons and neutrons located within the nucleus, with electrons in orbitals surrounding the nucleus.
Substance induced vs. primary psychiatric conditions are identified:
Easily on the first meeting with the patient
Only after a full month of abstinence
Without family history for it is of little value
Sometimes with consistent opioid use
Answers
Substance-induced vs. primary psychiatric conditions are identified after a full month of abstinence, as substance use can mimic psychiatric symptoms. Family history may also be relevant.
It might be challenging to distinguish between basic mental disorders and substance-induced disorders. Since drug usage might mirror mental symptoms, it is not always simple to spot them on the initial visit with the patient. Before reaching a final diagnosis, it is crucial to wait a full month of sobriety, since this will assist reveal any underlying psychological disorders that could be present.
Given that certain psychiatric diseases have a hereditary component, family history might be useful in identifying the condition's nature. Secondary problems can also arise as a result of ongoing opioid usage.
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This hydrocarbon is incomplete. Draw the hydrogen atoms and the bonds connecting them to carbon atoms such that each carbon atom has four bonds. Then record the number of hydrogen atoms you drew using a text box.
Answers
The number of the hydrogen atoms that would be required from the diagram is 10.
What is a saturated compound?A Saturated compound has all its carbon atoms connected by single bonds, and each carbon atom is bonded to the maximum number of hydrogen atoms possible. This arrangement allows the compound to have no available or unsaturated bonds for additional atoms.
The compound that is shown must be butane as such the number of the hydrogen atoms that it contains is a total of ten.
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