Hz is a weak acid. An aqueous solution of hz is prepared by dissolving 0. 020 mol of hz in sufficient water to yield 1. 0 l of solution. The ph of the solution was 4. 93 at 25. 0 °c. The ka of hz is ________.
Answers
Given:
An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution.pH of the solution was 4.93 at 25.0°C
We have to calculate the Ka of HZ.
First of all, we need to write the balanced chemical equation of dissociation of weak acid HZ in water as follows:
HZ + H2O ⇌ H3O+ + Z-Initial conc
= 0.02 mol/L, and
volume = 1 L,
moles = conc x vol
= 0.02 x 1
= 0.02 mol/
Let x be the degree of dissociation of the weak acid, HZ.
Then, at equilibrium, the concentration of H3O+ will be x mol/L and the concentration of HZ and Z- will be (0.02 - x) mol/L.
We know that the pH of a solution is given by:
pH = -log[H3O+]
Here, pH = 4.93,
so[H3O+] = antilog(-4.93)
= 6.80 × 10⁻⁵ mol/L
Now, for the weak acid, we can write the expression for Ka as:
Ka = [H3O+] [Z-] / [HZ]
Putting the values together, we get:
Ka = (6.80 × 10⁻⁵ × 6.80 × 10⁻⁵) / (0.02 - 6.80 × 10⁻⁵)
= 4.6 × 10⁻⁵The Ka of HZ is 4.6 105.
Hence, the required answer is "4.6 105". Note: We can also solve the above problem by using the Henderson-Hasselbalch equation:
pH = pKa + log ([A-] / [HA])Given that
pH = 4.93 and [A-] / [HA]
= [H3O+] / [HZ]
= x / (0.02 - x)
So, the above equation can be written as:
4.93 = -logKa + log(x / (0.02 - x))
Now, we have two unknowns, Ka and x.So, we need one more equation to solve for Ka
.We know that degree of dissociation,α = x / initial concentration
= x / 0.02
For weak acid, α is very small, so we can assume (0.02 - x)
≈ 0.02
.Then, using the expression for Ka and degree of dissociation, α, we can write:[H3O+] = αKa = x² / (0.02 - x)Ka = [H3O+] (0.02 - x) / x²
Now, we have three equations with two unknowns. Hence, we can solve for Ka and x.
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The weak acid in question here is Hz, and its Ka needs to be found. In this case, an aqueous solution of Hz is prepared by dissolving 0.020 mol of Hz in sufficient water to yield 1.0 L of the solution. Also, the pH of the solution was 4.93 at 25.0°C.
To find the Ka of Hz, we will use the formula for the acid dissociation constant. This is given as Ka = [H3O+][A-]/[HA], where H3O+ is the hydronium ion, A- is the conjugate base, and HA is the acid being considered. The first step is to find the concentration of H3O+ ions in the solution using the pH of the solution.
This is given by the formula pH = -log[H3O+]. Therefore, [H3O+] = 10^(-pH) = 10^(-4.93) = 7.054 x 10^(-5) mol/L.To find the concentration of Hz, we will divide the number of moles of Hz by the volume of the solution. This gives [HA] = 0.020 mol / 1.0 L = 0.020 mol/L.
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Related Questions
what differentiates a nonpolar covalent bond from a polar covalent bond? i. unequal sharing of electrons ii. ions iii. atoms of partial charge
Answers
The key differentiating factor between a nonpolar covalent bond and a polar covalent bond is the unequal sharing of electrons.
i. Unequal sharing of electrons: In a nonpolar covalent bond, electrons are shared equally between the atoms. This occurs when the atoms have similar electronegativity, meaning they have similar abilities to attract electrons. As a result, there is no significant difference in the electron distribution, and the atoms do not acquire partial charges.
ii. Ions: Ions are charged particles that have gained or lost electrons. Unlike ionic bonds, which involve the complete transfer of electrons, covalent bonds involve the sharing of electrons between atoms. Therefore, the presence of ions does not differentiate between nonpolar and polar covalent bonds.
iii. Atoms of partial charge: In a polar covalent bond, there is an unequal sharing of electrons due to differences in electronegativity between the atoms. One atom has a stronger pull on the shared electrons, resulting in a partial negative charge (δ-) on that atom, while the other atom has a partial positive charge (δ+).
This imbalance in electron distribution creates atoms of partial charge.
Therefore, the key distinguishing characteristic between a nonpolar covalent bond and a polar covalent bond is the unequal sharing of electrons, leading to the development of partial charges on the atoms in a polar covalent bond.
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some solve it but i want exact
answe
Answers
Answer:
S = 32.653061%
0⁴ = 65.3061%
Explanation:
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If you answered yes to the previous question, enter the amount of energy absorbed or released by reaction (2):
Answers
The energy released when adding an electron is the energy released in the atomization reaction. This energy is called electron affinity. The electron affinity of Si is 133.6 KJ/mol.
What is electron affinity ?Electron affinity of an atom is its tendency to capture an electron from other atoms towards its nucleus. The more the electron affinity the more will be its reactivity.
The minimum energy required to remove a loosely bound electron from the valence orbital is called its ionization energy. In the given reaction, silicon is accepting an electron to form its atomic state. Thus, it is releasing the energy.
This energy released during gaining one electron is equal to the electron affinity of silicon that is 133.6 kJ/mol.
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Methanol, propan-1-ol and ethanol has boiling point of 65 degree celsius, 97 degree celsuis, 87 degree celsuis respectively. A student uses fractional distillation to separate a mixture of these compound. State which liquid will be collected in the second fraction and explain why
Answers
Answer:
ethanol
Explanation:
Methanol has a boiling point of 65°C, propan-1-ol has a boiling point of 97°C and ethanol has a boiling point of 87°C
Fractional distillation is used for separating miscible liquids through the use of the different vapor pressure properties of the liquids. As the mixture is heated up, components start to vaporize according to their boiling points. The component with the least boiling point vaporizes first while the component with the highest boiling point vaporizes last.
This means that methanol would vaporize at the first fraction because it has the lowest boiling point followed by ethanol at the second fraction and then propan-1-ol at the last fraction.
3. From a stock solution of Dye A, a series of four dilutions were made. The concentration and absorbance
data are given below, beginning with a calibrated blank of distilled water. Plot a Beer-Lambert law graph of absorbance versus concentration.
Concentration
Absorbance
0.000 (blank)
4
0.00 M
1.00 x 10-5 M
0.270
2.00 x 10-5 M
0.550
3.00 x 10-5 M
0.810
4.00 x 10-5 M
1.100
Answers
Thus mass of dye A = 10.24 mg/L
Plot Beer-Lambert law
Beer-Lambert law states that absorbance of an analye (here, dye A) is directly proportional to its concentration (C) and pathlength (l) of the solution
i.e. A \propto C*l
or A = \epsilonCl
where \epsilon = proportionality constant and is called absorptivity coefficient. It is characteristic for an analyte at a given wavelength, unit = M-1cm-1
Thus above equation can be compared with a straight line equation as y = mx+c
where y = absorbance, x = concentration and \epsilon = slope, c = intercept = 0 for absorbance vs concentration plot.
b. Calculate the slope (m) of graph:
for absorbance vs concentration plot.
The given data was plotted and fitted to a liner fit that gave the equation as:
y = 27335 x
slope of the line = 27335
thus \epsilon = 27335 M-1cm-1
c. Concnetration using Beer-Lambert plot:
Absorbance of dye A in Sports drink, A = 0.700
point absorbance of 0.007 on y-axis and interpolate to the linear fit. Check the corresponding value at x-axis as follows:
the corresponding line meets x-axis at 0.00002 + 4-squares
In the graph drawn, 7 squares in x-axis = 0.00001
thus 4 squares on x-axis = 0.00001*4/7 = 5.71*10-6
thus for y = 0.700 the corresponding x-axis reads = 0.00002+5.71*10-6
or C = 2.57*10-5 M
d. Concnetration of dye A using slope of fitted line:
Absorbance of dye A in Sports drink, A = 0.700
substituting the absorbance in the linear fit equation we can calulate the concentration as:
0.700 = 27335*C
C = 0.700/27335
C = 2.56*10-5 M
e. Mass of dye A in mg/L
Molar mass of dye = 400 g/mol
Concentration (molarity) of dye A = 2.56*10-5 M
1 M = number of moles of solute present in 1 L of solution volume
number of moles = mass / molar mass
\therefore Molarity = mass of solute/(molar mass of solute*volume of solution)
for solution volume = 1L
Molarity = mass of solute/molar mass of solute
rearranging this we get:
mass of solute = (Molarity*molar mass of solute) g/L
mass of dye A = 2.56*10-5* 400 g/L
m = 0.01024 g/L
1 g = 1000 mg
Thus mass of dye A = 10.24 mg/L
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What measuring tool would you use to measure the area of a
football field? Taking into account the tool you just chose, to what
decimal place would you record your answer? (make up some
numbers that represent the dimensions of the field and use them to
explain your answer)
Answers
Measuring tool would you use to measure the area of a football field is used a tender wheel
If you need to measure much longer lengths for example the length of a football pitch then you could use a trundle wheel then you use it by pushing the wheel along the ground and it clicks every time it measures one meter and to measure the football field area then
Area = length×breadth
Area = 90m×45m
Area = 4.05m²
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Please help How many moles of a gas sample are in 5.0 L container at 215 K and 342 kPa(The gas constant is 8.31 L kPa/mol K) Round your answer to one decimal place and enter the number only with no units.
Answers
Answer
1.0 mol
Explanation
Given:
Volume, V = 5.0 L
Temperature, T = 215 K
Pressure, P = 342 kPa
The gas constant, R = 8.31 L kPa/mol K
What to find:
The number of moles of the gas sample.
Step-step-solution:
The number of moles of the gas can be determine using the ideal gas equation formula:
\(PV=nRT\)Put the given values into the formula and calculate for n:
\(\begin{gathered} 342\times5.0=n\times8.31\times215 \\ 1710=1786.65n \\ \text{Divide both sides by 1786.65} \\ \frac{1710}{1786.65}=\frac{1786.65n}{1786.65} \\ n=0.9571\text{ mol} \\ To\text{ one decimal place,} \\ n=1.0\text{ mol} \end{gathered}\)The number of moles of the gas sample is 1.0 mol.
In this nuclear reaction equation, oxygen decays to form nitrogen. Which equation describes this decay? Choices in the picture
Answers
In this nuclear reaction equation, oxygen decays to form nitrogen, the equation that correctly describes it is Oxygen-15 -> Nitrogen-15 + electron + anti-neutrino, i.e., \(^1^5_8O--- > ^{15}_7N+^0_1e\).
Nuclear decay is a process that occurs when the nucleus of an atom is unstable and releases particles or energy in order to become more stable.
There are three main types of nuclear decay: alpha decay, beta decay, and gamma decay.
The equation that describes the decay of oxygen to form nitrogen is:
Oxygen-15 -> Nitrogen-15 + electron + anti-neutrino
\(^1^5_8O--- > ^{15}_7N+^0_1e\).
This is an example of beta decay, where a neutron in the nucleus of the oxygen-15 atom is converted into a proton, releasing an electron and an anti-neutrino.
Thus, the oxygen-15 nucleus is transformed into a nitrogen-15 nucleus.
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Compare and Contrast the two common forces of gravity and friction.
Answers
Answer:
Gravity always pulls objects such as a desk, book or person down. Thus, when you jump gravity causes you to land on the ground. Friction, however, doesn't pull objects down
brainley.
How is Earths crust recycled?
Answers
I think it's the last one
(and I'm so sorry if I'm wrong)
Answer:
The answer is D
Explanation:
The rest of them are not cycles.
i need help asap!! i will give brainliest
Answers
A rigid cylinder is filled with 100 mL of nitrogen gas at 25°C and a pressure of 1.00 atm. What will the pressure of the gas be if a piston compresses the gas to a volume of 25 mL at constant temperature?
0.25 atm
1.00 atm
4.00 atm
2,500 atm
Answers
100mL *1 atm= 25mL*Pressure
2. Why do ions form?
Answers
Answer:
When atoms lose or gain electrons, they become positively or negatively charged ions. In an ionic compound, the ions are arranged in a three-dimensional structure called a crystal. ... When an atoms gains or loses electrons, it gains a charge, thus becoming an ion.
Explanation:
Answer:
The iron ore deposits began forming when the first organisms capable of photosynthesis began releasing oxygen into the waters.
Explanation:
1. Which statement is correct about intermolecular versus intramolecular forces?
Intramolecular forces exist within a single molecule. Covalent bonding is an example.
Intermolecular forces exist within a single molecule. Hydrogen bonding is an example.
Intermolecular forces exist between separate molecules. Covalent bonding is an example.
Intramolecular forces exist between separate molecules. Hydrogen bonding is an example.
Answers
e12133123123123e12133123123123e12133123123123e12133123123123
The correct notation for the reduced form of nicotinamide adenine dinucleotide is:____.
Answers
The correct notation for the reduced form of nicotinamide adenine dinucleotide is NADH.
NAD or nicotinamide adenine dinucleotide is a molecule that contains two nucleotides, that is, ribose or deoxyribose, and a nitrogenous base. NAD exists in two forms: oxidized (NAD+) and reduced (NADH).
It is a critical cofactor involved in many biological reactions in the body, including cellular respiration, metabolic processes, and DNA repair.
In addition, it plays an essential role in the electron transport chain in cells that helps to generate adenosine triphosphate (ATP), the energy currency of the body.
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0.66 mol of NH4NO3 is dissolved in water to produce a solution with a concentration of 1.645 M. What is the volume of the solution in liters?
Answers
The volume of the solution with a concentration of 1.645 M is found out to be 0.401 liters (or 401 mL).
How do you calculate the volume of the given solution?To solve this problem, we make use the formula for molarity:
Molarity = moles of solute / volume of solution in liters
We are given the molarity of the solution in the question, and the amount of solute in moles, so by rearranging the formula to solve for the volume of the solution:
Volume of solution in liters = moles of solute / molarity
On substituting the given values:
Volume of solution in liters = 0.66 mol / 1.645 M
Volume of solution in liters = 0.401 L
Therefore, the volume of the solution is 0.401 liters (or 401 mL).
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What mass in grams of solute is needed to prepare 0.210 L of 0.819MK2Cr2O7 ? Express your answer with the appropriate units. X Incorrect; Try Again; 4 attempts remaining What mass in grams of solute is needed to prepare 525 mL of 4.60×10−2MKMnO ? Express your answer with the appropriate units. What mass in grams of nitric acid is required to react with 448 gC7H8 ? Express your answer with the appropriate units. Part B What mass in grams of TNT can be made from 289 gC7H8 ? Express your answer with the appropriate units. What volume, in liters, of SO2 is foed when 127 L of H2 S( g) is burned? Assume that both gases are measured under the same conditions. Express your answer to three significant figures and include the appropriate units.
Answers
From the question;
1) The mass if 50.6 g
2) The mass is 3.8 g
3) The mass is 926.1 g
3b) The mass is 712.9 g
4) The volume is 127.7 L
What is the mole?We know that;
Number of moles = concentration * volume
Number of moles = mass/ molar mass
mass = concentration * volume * molar mass
Question 1
0.819M * 0.210 L * 294 g/mol
= 50.6 g
Question 2
0.046 M * 0.525 L * 158 g/mol
= 3.8 g
Question 3
Number of moles = 448 g/92 g/mol
= 4.9 moles
If 1 mole of toluene reacts with 3 moles of nitric acid
4.9 moles of toluene reacts with 4.9 * 3/1
= 14.7 moles
Mass of the nitric acid = 14.7 moles * 63 g/mol
= 926.1 g
Part B
Number of moles of toluene = 289 g/92 g/mol
= 3.14 moles
If 1 mole of toluene produces 1 moles of nitric acid
Moles of TNT produced = 3.14 mol * 227 g/mol
= 712.9 g
If 1 mole of hydrogen sulfide occupies 22.4 L
x moles of hydrogen sulfide occupies 127 L
x = 5.7 moles
2 moles of hydrogen sulfide produces 2 moles of sulfur dioxide
Moles of sulfur dioxide produced = 5.7 moles
Volume of sulfur dioxide produced = 5.7 moles * 22.4 L/1 mol
= 127.7 L
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What is difference between simple distillation & fractional distillation
Answers
Answer: simple distillation is used to separate substances in mixtures with widely disparate boiling points, whereas fractional distillation is used for mixtures containing chemicals with similar boiling points.
Explanation:
1. NaOH is a strong base, HCI is a strong acid, and HCOOH is a weak acid. A. Which titration is between a strong acid and a strong base? b. Which titration is between a weak acid and a strong base?
Answers
a. The titration between a strong acid and a strong base is represented by the combination of HCI (strong acid) and NaOH (strong base).
b. The titration between a weak acid and a strong base is represented by the combination of HCOOH (weak acid) and NaOH (strong base).
In a titration, a solution of known concentration (titrant) is gradually added to a solution of unknown concentration (analyte) until the reaction between the two is complete. The equivalence point is reached when stoichiometrically equivalent amounts of acid and base have reacted.
Since, HCI is a strong acid, and NaOH is a strong base. Therefore, the combination of HCI and NaOH represents the titration between a strong acid and a strong base.
HCOOH is a weak acid, and NaOH is a strong base. Therefore, the combination of HCOOH and NaOH represents the titration between a weak acid and a strong base.
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Which of the following represent a mole ratio between silver nitrate and appper(II) nitrate in the following reaction: 2AgNO3 + Cu --> Cu(NO3)2 + 2Af
Answers
There is no direct involvement of \(Cu(NO_3)_2\) in the mole ratio calculation as it is not a reactant with \(AgNO_3.\)
The balanced chemical equation for the given reaction is:
\(2AgNO_3 + Cu -- > Cu(NO_3)_2 + 2Ag\)
According to this equation, the mole ratio between \(AgNO_3\) and Cu is 2:1, which means that for every 2 moles of \(AgNO_3\) used, 1 mole of Cu is consumed.
There is no direct mole ratio between \(AgNO_3\) and \(Cu(NO_3)_2\) or between \(AgNO_3\) and Ag. However, we can calculate the mole ratio between \(AgNO_3\) and Ag using the stoichiometric coefficients in the balanced equation.
For every 2 moles of \(AgNO_3\) used, 2 moles of Ag are produced. Therefore, the mole ratio between \(AgNO_3\) and Ag is 2:2 or simply 1:1.
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what is a tidal barrage
plase explaine
Answers
Answer:
A dam like structure used to capture energy from masses of water moving in or out of a bay of rivers due to tidal force is called tidal barrage.
Explanation:
It may help you to solve question.
identify the proteins in the following list of molecules.
Answers
Myosin drives muscle contraction, insulin regulates blood sugar, hemoglobin transports oxygen, and collagen supports tissues. These proteins are vital for physiological functions in the body.
Of the molecules listed, three are proteins, while one is a fibrous structural protein:
1. Myosin: Myosin is a motor protein that plays a crucial role in muscle contraction and movement. It is responsible for the sliding of muscle fibers and the generation of force in muscle cells.
2. Insulin: Insulin is a peptide hormone that regulates blood sugar levels. It is produced by the pancreas and helps to control glucose uptake by cells, promoting its storage as glycogen in the liver and muscles, and regulating protein and fat metabolism.
3. Hemoglobin: Hemoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to the tissues throughout the body. It binds to oxygen in the lungs and releases it in areas with lower oxygen concentrations.
4. Collagen: Collagen is a fibrous protein that provides structural support to various tissues, including the skin, tendons, ligaments, and bones. It contributes to the strength, elasticity, and integrity of these tissues.
These proteins play important roles in various physiological processes, contributing to muscle function, metabolic regulation, oxygen transport, and tissue structure.
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Complete question :
Identify the proteins in the following list of molecules.
1. Myosin
2. Insulin
3. Hemoglobin
4. Collagen
Proteins are biological molecules made of chains of amino acids. They perform many functions in organisms as determined by their amino acid composition. There are various types of proteins with diverse roles, and methods such as proteomic analysis are used to study them.
Explanation:Proteins are large biological molecules comprised of long chains of smaller molecules known as amino acids. These proteins perform a plethora of functions within organisms, from transporting molecules across cell membranes to replicating DNA and catalyzing metabolic reactions. The specific functionality and properties of proteins are determined by the combination of amino acids that compose them.
There are several types of proteins which include but are not limited to structural proteins, regulatory proteins, contractile proteins, protective proteins, transport proteins, storage proteins and enzymes. Some integral proteins also serve dual roles as both a receptor and an ion channel. For example, on nerve cells, there are receptors that bind neurotransmitters like dopamine which leads to a chemical reaction within the cell.
Proteomic analysis techniques like mass spectrometry and X-ray crystallography are often used to study, identify, and analyze the characteristics and structure of a protein.
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PLEASE HELP ASAP
which is a primary consumer?
Picture shown above
Answers
zooplankton cod and krill
Outline the laboratory procedure for preparing a specific volume of a dilute solution from a concentrated stock solution
Answers
The various steps of how to prepare a specific volume of a dilute solution from a concentrated stock solution is described below.
Preparation of a dilute solution from stock solutionA stock solution is the solution that contains the standard concentration of a chemical compound.
A diluted solution is the solution shoes concentration has been decrease through addition of a solvent like water.
To prepare a dilute solution from a stock solution the following is done:
the needed volume of the stock solution is calculated,the volume is added to a volumetric flask,water is then added into the volumetric flask till it reaches the calibration line.Learn more about stock solutions here:
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Answers
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What is the mass notation number of an atom that has 9 protons, 11 neutrons, and 9 electrons?
Answers
Answer:
By looking at the periodic table, you will see that Fluorine has 9 protons. Since the number of electrons equal the number of protons, Fluorine has 9 electrons as well. Meanwhile, it's mass number of 19, minus 10 neutrons, gives you 9 protons or electrons. Hence, the atom would be Fluorine.
Explanation:
As seen in the periodic table fluorine has 9 protons and
9 electrons as number of protons are equal to the
number of electrons. The mass notation number of
fluorine having 11 neutrons is 20.
What is mass notation number?
Mass number (A) = number of protons + number of electronsAn atom has electrons, protons, and neutrons. Protons and neutrons reside in the nucleus of an atom, and they, in together, are called nucleons. The number of nucleons present in an atom is called mass number. Mass number is responsible for the mass of an atom or atomic mass. Since protons and neutrons are heavier than electrons, The mass of an atom is estimated by the number of protons and the number of neutrons.What is the atomic number of fluorine?
The atomic number of fluorine is 9.
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What did Edwin Hubble discover about the universe?
O Distant stars are all moving away from us.
O The farthest stars are blueshifted.
O The stars in our galaxy are all moving away from us.
The universe is an unchanging place.
Answers
what carbonyl compound and alcohol are formed by hydrolysis of each acetal
Answers
Acetals can be hydrolyzed using catalytic acid to produce a carbonyl compound and alcohol. If the acid concentration is increased, acetal can be hydrolyzed back to its initial aldehyde or ketone form.
This mechanism occurs in the opposite direction of the acetal formation mechanism. The hydrolysis of each acetal generates a carbonyl compound and an alcohol.What are Acetals?Acetals are organic compounds that are formed by the reaction of an aldehyde or ketone with two molecules of alcohol, and they have the following general structure: R1R2C(OR')2.Acetals can be regarded as derived from hemiacetals, which are formed by the reaction of an aldehyde or ketone with one molecule of alcohol.The carbonyl carbon in an acetal is bonded to two alkoxide (OR) groups, while the carbonyl carbon in a hemiacetal is bonded to only one. As a result, acetals are more stable than hemiacetals. Acetals are widely used in organic synthesis, including as protecting groups for carbonyl groups in reactions that would otherwise destroy them.Example:Acetal hydrolysis occurs when an acid catalyst is used to cleave the two ether bonds in the molecule. When an acetal is hydrolyzed with an acid catalyst such as H2SO4, a carbonyl compound and an alcohol are formed.Example:H2SO4 is added to the acetal, which hydrolyzes it, producing an aldehyde or ketone and two alcohol molecules. For example, if dimethyl acetal is hydrolyzed, it will yield acetone and two methanol molecules.
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question 3 a reaction equation, shown below, consumes 5.0 g of a and 6.0 g of b. how many total grams of c and d should be obtained? 1 a 3 b → 2 c 4 d
Answers
By law of conservation of mass The total grams of c and d obtained is equal tp 11 gm
When two or more molecules or compounds interact, one or more new substances are created. These chemical reactions adhere to a set of rules known as the laws of chemical combination. One of the laws of chemical combination is the law of conservation of mass
This law states that the total mass of the reactants equals the total mass of the result in any physical or chemical change (s).
That implies that mass is unaffected by the reaction both before and after it.
Thus, the mass of all reactants equals the mass of all products, and the mass of A and B equals the mass of C and D.
The mass of C and D is (5g + 6g) = 11g
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for the reaction 2c4h10 (g) 13 o2 (g) → 8 co2 (g) 10 h2o (g) δh° is -125 kj/mol and δs° is 253 j/k ∙ mol. this reaction is ________
Answers
The given chemical equation represents the combustion of 2 moles of C4H10 (butane) with 13 moles of O2 (oxygen) to produce 8 moles of CO2 (carbon dioxide) and 10 moles of H2O (water) in the gaseous state.
The negative sign indicates that the reaction is exothermic, meaning that it releases heat to the surroundings. This makes sense for a combustion reaction, where fuel (C4H10) reacts with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O), both of which have lower enthalpies than the reactants. The release of heat is due to the breaking and forming of chemical bonds, which results in a more stable and lower-energy state of the products.
The entropy change for the reaction, denoted by δS°, is 253 J/K∙mol. This represents the change in the degree of disorder or randomness of the particles involved in the reaction. The positive value indicates that the products are more disordered or have a higher entropy than the reactants.
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