Ozone is made up of three oxygens and is formed when two, oxygen gas reacts with sunlight and electrical discharges in the atmosphere.
Ozone is an important component of the Earth's atmosphere as it helps to protect us from the harmful ultraviolet (UV) radiation from the Sun. It is formed when oxygen molecules in the atmosphere are split apart by UV radiation, resulting in two oxygen atoms that then combine with an oxygen molecule to form ozone. This process is known as photochemical smog and occurs mainly in the lower atmosphere. Ozone is also formed in the upper atmosphere from electrical discharges from lightning, and from chemical reactions between nitrogen oxides and hydrocarbons.
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which choice ranks the elements carbon, sodium, calcium, and iodine in order of decresing number of valence electrons
The rank of the elements in order of decreasing number of valence electrons are: Iodine → Carbon → Calcium → Sodium.
An element is a pure substance which is consisting of only one type of atoms having the same numbers of protons in their nuclei.
Iodine: Iodine is a chemical element having symbol I and its atomic number will be 53. Iodine occurs in many oxidation states, such as iodide (I⁻), iodate (IO₃⁻) and the various periodate anions.
Carbon: Carbon is a chemical element having symbol C and its atomic number will be 6. It is nonmetallic as well as tetravalent—its atom making four electrons available to form covalent chemical bonds.
Calcium: Calcium is a chemical element having symbol Ca and its atomic number will be 20. As an alkaline earth metal, calcium is a reactive metal which forms a dark oxide-nitride layer when exposed to air.
Sodium: Sodium is a chemical element having symbol Na (from Latin natrium) and its atomic number will be 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, belong to the group 1 of the modern periodic table. Its only stable isotope will be 23Na.
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a soil sample near chernobyl was found to contain 187kbq/m2 of cesium-137 . if the half-life of cesium-137 is approximately 30 years, how much cesium-137 will remain in the sample after 90 years? responses
After 90 years, approximately 9.25% of the initial amount of cesium-137 will remain in the sample.
Cesium-137 is a radioactive isotope that has a half-life of approximately 30 years. The half-life of a radioactive isotope is the amount of time it takes for half of the initial amount to decay.
In the case of the soil sample near Chernobyl, it was found to contain 187 kbq/m2 of cesium-137.
After 30 years, half of the initial amount of cesium-137 will remain in the sample, meaning the remaining amount would be 93.5 kbq/m2.After 60 years, half of the remaining amount from 30 years will decay, leaving 46.75 kbq/m2.After 90 years, approximately 9.25% of the initial amount of cesium-137 will remain in the sample, or approximately 17.19 kbq/m2.Learn more about radioactive isotopes here:
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what is the range in concentrations (i.e., minimum to maximum concentrations) of stratospheric ozone during the course of the year over atlanta? we are using atlanta as an example of a place in the middle latitudes of the northern hemisphere
The minimum range in concentrations of stratospheric ozone is 220 and the maximum range in concentrations of stratospheric ozone is 320.
Ozone will be comparatively rare in the atmosphere - there are only 3 molecules of the ozone for every ten million air molecules. 90% of the planet's ozone in the "ozone layer" which will exists in the lower level of the stratosphere. Stratosphere is the region of the atmosphere which exists in between 10 and 50 km above the surface of the earth. Solar wavelengths in the ultraviolet range (180-240 nanometers) are absorbed by and break apart oxygen molecules (which is made of two oxygen atoms). A different range of the wavelengths of ultraviolet (290-300 nm) are strongly absorbed by ozone, which breaks down as a result and reforms it into the molecular oxygen again.
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which of the given compounds has a base peak at m/z = 43? ch3ch2ch2ch2ch2ch3 (ch3ch2)2chch3 (ch3)3cch2ch3 (ch3)2chch(ch3)2 none of these
The base peak at m/z = 43 corresponds to the molecular ion of the compound CH3CH2CH2CH2CH2CH3, also known as hexane.
A mass spectrometer works by breaking apart a molecule and measuring the masses of the resulting ions. The most intense peak in the resulting mass spectrum is known as the base peak, and corresponds to the most abundant ion produced in the experiment.
In the case of hexane, the molecular ion produced is CH3CH2CH2CH2CH2CH3+, which has a mass of 43 atomic mass units, and is therefore the base peak at m/z = 43. The other compounds listed do not have a base peak at m/z = 43, as they have different molecular weights and different fragments produced upon ionization.
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3. consider the electrochemical cell shown below with one half-cell containing the standard pt/h electrode and the other containing a pb electrode in a one-molar solution of its ions. what concentration of h ions is necessary for the reaction to be in equilibrium with no transfer of electrons through the external circuit?
For the electrochemical cell shown, the necessary concentration of H+ ions for the reaction to be in equilibrium with no transfer of electrons through the external circuit is 1 M.
This is because the standard potential of the Pt/H electrode is 0 volts, and the standard potential of the Pb electrode is -0.13 volts. Since the two half-cells have the same concentration (1 M), the potential difference between them is 0 volts, and thus no net transfer of electrons through the external circuit occurs.
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Question 17 of 20
What is an advantage of nuclear power plants over coal power plants?
Nuclear fission yields more energy than fossil fuel combustion. Some examples of fossil fuels are coal, oil, or gas. The procedure delivers almost 8,000 times more additional power than the typical fossil fuel method. This results in less material being used and yielding less waste.
What is the difference between coal and nuclear power plant?The main difference between them is the type of fuel. Nuclear power plants use radioactive elements such as uranium to produce heat in the process. On the other hand, coal power plants use coal as a source of energy.
Which is cheaper- coal or nuclear power plant?The quantities required are very less than for coal or oil. One kg of natural uranium will yield about 20,000 times as much energy as the same amount of coal.
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identify the pair of species that is not a conjugate acid-base pair. nh 4; nh3nh4 ; nh3 h2so4; so2−4h2so4; so42− hno2; no−2hno2; no2− h2co3; hco−3
The pair of the species that is not the conjugate acid-base pair is the correct option is : H₂SO₄ and SO₄²⁻ .
The conjugate base for the sulfuric acid H₂SO₄ is as follows :
H₂SO₄ + H₂O ----> H₃O⁺ + HSO₄⁻
acid conjugate base
All acids have the conjugate base and all bases have the conjugate acid. Acids are the substance which donates H⁺ when they react. An acid and the base which are differ only by the presence or the absence of the proton are called as the conjugate acid-base pair.
Thus, H₂SO₄ and SO₄²⁻ is not the conjugate acid - base pair.
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The balmer series of lines for the hydrogen atom are found only in the visible region of the spectrum.a. Trueb. False
True. The Balmer series of lines for the hydrogen atom are found only in the visible region of the spectrum.
The Balmer series of lines for the hydrogen atom are found in the visible region of the spectrum because of the specific energy levels that the electrons must be in to emit the visible light that makes up the series [1]. When an electron moves from a higher energy level to a lower energy level, it releases a photon of light with a specific wavelength that is determined by the energy difference between the two levels. This is known as an emission line and the Balmer series is composed of the emission lines that are seen in the visible spectrum.
The Balmer series of lines are the result of electrons transitioning from the n=3 to n=2 energy levels, n=4 to n=2, n=5 to n=2, and n=6 to n=2. Each of these transitions produces a photon of light with a specific wavelength. The exact wavelengths of the Balmer series lines are determined by the Rydberg formula, which uses the atomic mass and the Rydberg constant to calculate the energy levels of the hydrogen atom.
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What is the mass in grams of 1.56 moles of C6H6
Explanation:
The mass of C₆H₆ is 121.68 grams.
Given:
Moles of C₆H₆ =1.56 moles
To find:
Mass of C₆H₆ =?
Number of moles:
It is defined as given mass over molar mass.
Number of moles = Given mass / Molar mass
Molar mass of C₆H₆ = 12*6 + 1*6 = 72+6= 78 g/mol
Mass = Number of moles * Molar mass
Mass = 1.56 moles * 78 g/mol
Mass = 121.68 grams
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a large tank is filled with 125 mol o₂ to a pressure of 1145 torr at 25.0 °c. what is the volume (in l) of the tank?
The large tank is filled with the 125 mol O₂ to a pressure of 1145 torr at the 25.0 °C. The volume (in l) of the tank is the 2036.3 L .
The mole of the gas O₂ = 125 mol
The pressure of the gas = 1145 torr = 1.50 atm
The temperature of the gas = 25.0 °C = 25 + 273 = 298 K
The ideal gas equation is as follows :
P V = n R T
V = n R T / P
V = (125 × 0.082 × 298 ) / 1.50
V = 2036.3 L
Thus the volume of the tank is 2036.3 L.
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identify the major and minor product(s) that are expected for the following reaction. select all that apply
The major product of the reaction is ethanol and the minor product is acetic acid. The chemical equation for the reaction is:
Ethyl acetate + Water → Ethanol + Acetic acid
The reaction is the hydrolysis of an ester, specifically ethyl acetate, to produce an alcohol and an acid.
The major product of this reaction is ethanol, which is produced from the hydrolysis of the ester. The chemical equation for the reaction is:
Ethyl acetate + Water → Ethanol + Acetic acid
The minor product of the reaction is acetic acid, which is produced from the hydrolysis of the ester. The chemical equation for the reaction is the same as above.
The reaction of ethyl acetate with water can be described as an acid-base reaction. The ester, ethyl acetate, reacts with water to produce an alcohol, ethanol, and an acid, acetic acid. The acidity of the reaction is due to the presence of the carboxylic acid, acetic acid. The hydrolysis of the ester to produce an alcohol and an acid is an equilibrium reaction. The rate of the reaction can be increased by increasing the temperature and/or adding a catalyst.
Therefore, the major product of the reaction is ethanol and the minor product is acetic acid. The chemical equation for the reaction is:
Ethyl acetate + Water → Ethanol + Acetic acid
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Which of the following pairs of solutions produces a precipitate when combined?
O NH4Cl and AgNO3
O Na₂SO4 and KCI
O Fe(NO)3 and KCI
O KOH and NH4CI
Answer:
Answer is NH4Cl and AgNO3
Explanation:
:)
explain why 2,2,5,5-tetramethylhex-3-yne can't be made using acetylide anions. select the single best answer.
2,2,5,5-tetramethyl hex-3-yne cannot be made using acetylide anions because it would require the formation of a highly strained carbon-carbon triple bond.
Acetylide anions are commonly used in organic synthesis to form carbon-carbon triple bonds through reaction with alkenes. However, the formation of a triple bond in 2,2,5,5-tetramethylhex-3-yne would result in a highly strained molecule due to the presence of large groups on adjacent carbon atoms.
The strain in the molecule would make the formation of the triple bond highly energetically unfavorable, preventing the reaction from occurring. In addition, the large groups on the carbon atoms would interfere with the electron-richness of the alkene, making it difficult for the acetylide anion to react and form the desired product. As a result, alternative methods must be used to synthesize 2,2,5,5-tetramethylhex-3-yne.
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how many optical isomers are possible for each of (i) 3, 3-dimethylhexane and (ii) 2, 3-dimethylhexane?
In case of 3,3-dimethylhexane the total number of optical isomers will be zero (0) and in case of 2, 3-dimethylhexane the total number of optical isomers will be two(2).
Optical isomers are the two compounds which contains the same number as well as kinds of atoms, and bonds (i.e., the connectivity between the atoms is the same), and different spatial arrangements of the atoms, but having non-superimposable mirror images. Each non-superimposable mirror image structure is known as enantiomer.
In case of 3,3-dimethylhexane it is optically inactive, as there is no choral center present so the number of optical isomers will be zero now. Whereas, in case of 2, 3-dimethylhexane there is choral center, so the number of number of optical isomers will be two.
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what mass of agcl will precipitate when .050 l of a 0.0500 m solution of agno3 reacts with 25.0 ml of 0.0330 m nacl ?\
The mass of AgCl precipitated when 0.050 L of a 0.0500 M solution of AgNO3 reacts with 25.0 mL of 0.0330 M NaCl is 0.3582 g.
We can use the stoichiometry of the reaction to calculate the mass of AgCl precipitated. The reaction between AgNO3 and NaCl is as follows:
AgNO3 + NaCl -> AgCl + NaNO3
From the reaction, we can see that 1 mole of AgNO3 reacts with 1 mole of NaCl to form 1 mole of AgCl. Therefore, we can use the molar ratios to calculate the amount of AgCl precipitated.
First, we can calculate the moles of AgNO3 in the 0.050 L of a 0.0500 M solution:
moles = concentration x volume
= 0.0500 M x 0.050 L
= 0.00250 moles
Next, we can calculate the moles of NaCl in the 25.0 mL of a 0.0330 M solution:
moles = concentration x volume
= 0.0330 M x 25.0 mL x (1 L / 1000 mL)
= 0.00825 moles
Since 1 mole of AgNO3 reacts with 1 mole of NaCl, we know that the reaction will only proceed until all the AgNO3 is reacted. Therefore, the amount of AgCl precipitated is equal to the amount of AgNO3 used, or 0.00250 moles.
Finally, we can use the moles to calculate the mass of AgCl precipitated:
mass = moles x molar mass
= 0.00250 moles x (143.32 g/mol)
= 0.3582 g
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A student notes that the grass was damp when she arrived at school at 7am and it was dry when she went out for the break btwn morning classes. Explain this occurrence in terms of reversible processes
The occurrence in the terms of the reversible process is given as :
H₂O (g) —> H₂O (l)H₂O (l) —> H₂O (g)A student notices that the grass was the damp when she arrived at the school at 7am and after that it was dry when she went out for the break between morning classes. The occurrence in the terms of the reversible process is given as :
When it was the cold at night, the below process occurred and the water condensed on grass is as :
H₂O (g) —> H₂O (l)When it warmed up, the following process occurred and the water evaporated is as :
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you are given the compound diamide. you need to mkae 10 ml of 0.5 m stock. how much diamide will be dissovled?
The 0.005 moles of diamide to make 10 ml of a 0.5 M solution of diamide.
To make 10 ml of a 0.5 M solution of diamide, you will need to dissolve the following amount of diamide:
DIAMIDE is used to treat patients with sudden (acute) or long-lasting (chronic) diarrhoea. It is also used to treat diarrhoea in people with an ileostomy (part of the intestines removed by surgery). DIAMIDE contains the active ingredient loperamide hydrochloride.
The simplest aliphatic compounds, such as diazo-methane, diazoethane, and azo-formic acid, are yellow; the diamide of the latter acid is orange-red. Ammonia also reacts immediately, giving phosphorus diamide, P(OH)(NH2)2, and the corresponding ammonium salt.⇒0.5 M = 0.5 moles/liter
So, for 10 ml (0.01 liters), you will need:
⇒0.5 moles/liter x 0.01 liters = 0.005 moles of diamide
Therefore, you will need to dissolve 0.005 moles of diamide to make 10 ml of a 0.5 M solution of diamide.
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. how many joules are needed to convert 12.0g of liquid water at 15.0°c to water vapor at 125.0°c?
The joules are needed to convert the 12 g of the liquid water at the 15.0 °C to water vapor at 125.0 °C is 7777.6 J.
The heat expression is as follows :
q = mc ΔT
where,
m = mass of the water
c = specific heat of the water
ΔH = heat of vaporization = 2260 J/g
ΔT = change in the temperature
q = ( 12 × 4.184 ) × ( 125 - 15) + ΔH
q = 50.16 × 110 + 2260
q = 5517.6 + 2260
q = 7777.6 J
Thus, The heat required is 7777.6 J
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what are two questions about what happened to the lake?
?Answer:??????
Explanation:
when is o(n2) considered a costly algorithm? is there a less costly alternative?
O(n^2) is considered a costly algorithm when the size of the input (n) is large, as the number of operations required to solve the problem increases exponentially with the size of the input.
In an O(n^2) algorithm, each operation takes roughly n steps, and the total number of operations grows as n^2. As a result, when n is large, the algorithm takes a long time to complete and may even become impractical to use.
There are alternative algorithms that are less costly than O(n^2) for large inputs. For example, O(nlogn) algorithms, such as the QuickSort or MergeSort algorithms, are more efficient for large inputs, as the number of operations grows logarithmically with the size of the input. Another alternative is O(n) algorithms, where the number of operations grows linearly with the size of the input. These algorithms are considered the most efficient and are preferred for large inputs.
In summary, O(n^2) is considered a costly algorithm for large inputs, and there are alternative algorithms, such as O(nlogn) and O(n), that are more efficient for solving problems with large inputs. The choice of algorithm depends on the specific problem and the size of the input, and it's essential to understand the trade-off between the efficiency of the algorithm and the complexity of the solution.
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What changes must a solid undergo to become a liquid?
Answer: A solid must undergo a change in temperature or pressure in order to become a liquid. Specifically, it must be heated to its melting point (or above) and/or the pressure on it must be decreased. This process is known as melting.
Explanation:
atoms are the building blocks of all matter and the smallest unit of a chemical element that still retains the properties of that element.(1 point) true false
Yes, it is accurate to say that atoms are the fundamental units of all matter and the smallest chemical unit with identifiable features.
A particle called an atom has a nucleus made up of protons and neutrons that is encircled by an electron cloud. The smallest component of a substance that cannot be broken down chemically. The atom is the fundamental unit of the chemical elements, and the chemical elements are distinguishable from one another by the number of protons in their atoms. The center of every atom is called the nucleus, and it is made up of protons and neutrons (particles with no charge). The nucleus is filled with electrons, which are negative particles.
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a collection of 59 identical metal coins, each with a diameter of 1.57 inches and a thickness of 0.0787 inch, is found to have a total weight of 6.322 lbs. what is the density (in g/ml) of the metal?
The density (in g/ml) of the metal 268700 g/m³.
To find the density of the metal, we need to know the mass and volume of the coins. We can calculate the volume of one coin and then multiply by the number of coins to get the total volume.
The volume of one coin can be found using the formula for the volume of a cylinder:
V = π × r² × h
where r is the radius and h is the height (thickness) of the coin.
r = 1.57 inches / 2 = 0.785 inches
h = 0.0787 inches
V = π × 0.785² × 0.0787 = 0.0109 cubic inches
Since 1 cubic inch = 16.387064 cm³, the volume of one coin is 0.0109 × 16.387064 = 0.179 cm³.
The total volume of the 59 coins is 0.179 × 59 = 10.58 cm³.
The mass of the coins is 6.322 lbs = 2834.9 g.
So the density of the metal is:
density = mass / volume
density = 2834.9 g / 10.58 cm³
density = 268.7 g/cm³ = 268700 g/m³
Therefore, the density of the metal is 268700 g/m³
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So i need 3 observations 2 inferences and 1 prediction.
I know i could do this but im lazy.
Habitat degradation: 25%, Exploitation: 50%, Invasive species and disease: 25%, Pollution: 25%, Climate change: 50%, Birds: 25%, Reptiles and amphibians: 25%, Mammals: 25% and Fish: 25%
What are the factors causing decline in biodiversity?Biodiversity is being threatened by many impacts from human activities. These include climate change, habitat destruction, over-exploitation of resources, pollution, and introduction of invasive species.
Climate change affects biodiversity by changing the physical and chemical environment, altering weather patterns, and increasing the frequency and intensity of extreme weather events. This can lead to a decrease in species diversity, as some species may not be able to survive in the new environment. Habitat destruction is another major factor in biodiversity loss, as it removes habitats that are necessary for species to survive and reproduce.
Over-exploitation of resources can lead to over-harvesting of animals and plants, removing an important source of food or shelter. Pollution can be toxic to species and can also disrupt the food chain. Finally, the introduction of invasive species can out-compete native species, leading to their decline.
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In which situation are unbalanced forces acting on an object?
Two people stand on opposite sides of a large tire. Both people pull the tire with equal force.
Two people stand on opposite sides of a large tire. Both people push the tire with equal force.
Two people stand on the same side of a large tire. Both people pull the tire with equal force.
Two people stand on the same side of a large tire. One person pushes the tire and the other pulls the tire with equal force.
The situation in which two people stand on the same side of a large tire, both people pull the tire with equal force is creating an unbalanced force. The force from the opposite side too acts on the tire and make the displacement.
What is force ?Force is an external agent acting on a body to change its motion or to deform it. The net force acting on the body depends on the direction and magnitude of all the force acting on it.
If two equal forces acts on the body from the same side they add up together and the net force is their sum. If the forces are acting from the opposite sides, they will cancel each other and is said to be balanced.
Here, two forces from the side is not balanced by a force from the opposite side in case 3 and make a displacement. Thus, the option 3 is correct.
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5. A Student titrated 0.1mol/dm ³
tetra oxo sulphate(vi) acid against
0.05 mol/dm³ solution of sodium
hydroxide
a mention the indicator
b.Name the solution to which indicator
added.
a duck of weight 10.9 lb on earth takes a voyage to visit earth's moon. what is the mass of the duck on the moon?
The units will constantly line up. A user can choose the units he wants the response to be displayed in, whether they be grams, kilograms, or pounds, and that unit will show in the answer just for the sake of clarity.
This determines an object's weight on the moon based on its weight on earth. The formula is Weight on the Moon= (Weight on Earth/9.81m/s2) * 1.622m/s2, which translates the weight of an object on Earth to lunar weight. The moon's radius and mass are both 1/4 times that of the earth. As a result, the gravitational attraction on the moon is roughly one-sixth that of the earth. As a result, an object weighs 1/6th as much on the moon as it does on Earth. Now, all you have to do to get an answer for the mass of the Earth in grams that is quite near to its true value is substitute pi = 3.14159, the period of the Moon, T, and its distance from the center of the Earth, R, before using G = 6.6 x 10-8. As a result, an object with a mass of 10 kg on the surface of the moon would weigh 98N.
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if 2.5 moles of zinc react with 6.0 moles of hydrochloric acid Zn + 2HCl → ZnCl2 + Hz, find mass of zinc chloride . what is the limiting reactant Zn (A=65.3) Cl (A=35.5) ? b) 136g c) 160g d) 165 g a) 140 g
Answer:
The mass of zinc chloride produced when 2.5 moles of zinc react with 6.0 moles of hydrochloric acid is 165 g. The limiting reactant is zinc, since it is the reactant with the smallest amount.
Explanation:
As a consequence, 2.5 moles of ZnCl2 weigh 340g. Because we have 2.5 moles of Zn, it is the limiting reactant. 140g is the right answer.
What is limiting reactant?In a chemical process, the limiting reagent is a reactant that is completely consumed when the reaction is complete. This reagent limits the amount of product generated since the reaction cannot continue without it.
Here,
a) Calculate the mass of zinc chloride produced as follows:
1 mole of ZnCl2 weighs 65.3 + 2 * 35.5 = 136g.
As a result, 2.5 moles of ZnCl2 have a mass of 2.5 * 136 = 340g.
b) To determine the limiting reactant, we compare the amount of each reactant to the amount required to react with all other reactants.
6 moles * 2 moles Zn/2 moles HCl = 6 moles Zn are required to react with all of the hydrochloric acid.
Zn is the limiting reactant since we have 2.5 moles of it.
d) The correct answer is 140g.
As a result, 2.5 moles of ZnCl2 have a mass of 340g. Zn is the limiting reactant since we have 2.5 moles of it. The correct answer is 140g.
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Which types of catalysis can increase the rate of a chemical reaction? Choose all correct answers; there may be more than one correct answer.
- enzymatic
- heterogeneous
- nuclear
- homogeneous
- electrolytic
- intramolecular
The types of the catalysis that can be increase the rate of the reaction is the correct option is enzymatic , heterogeneous homogeneous .
The Catalysts are the substances that will increase the speed of the chemical reaction when it is added to the reaction but without being consume. The Homogeneous catalysis will be occurs when the catalysts and the reactants are in the same phase. The Homogeneous catalysis occurs when the reactants and the catalyst are in the same phase.
Thus, enzymatic, heterogeneous catalysis and the homogeneous catalysis are the catalyst that can increase the rate of the chemical reaction.
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how much heat is released when 17.5 g of al react with excess fe2o3? show the conversions required to solve this problem. 2al(s) fe2o3(s)⟶al2o3(s) 2fe(s)δ=−852 kj
The amount of heat released when 17.5 g of Al reacts with excess Fe2O3 is -825.664 kJ.
To determine the amount of heat released when 17.5 g of Al reacts with excess Fe2O3, we need to first determine how many moles of Al are present. Then we can use the balanced chemical equation to determine the number of moles of Fe2O3 that react, and finally, we can use the enthalpy change of reaction to determine the amount of heat released.
Convert the mass of Al to moles:
moles Al = mass Al / molar mass Al
moles Al = 17.5 g / 26.98 g/mol
moles Al = 0.648 mol
Use the balanced chemical equation to determine the number of moles of Fe2O3 that react:
2 moles of Al react with 3 moles of Fe2O3
moles Fe2O3 = (3 moles) / (2 moles) * moles Al
moles Fe2O3 = 0.972 mol
Use the enthalpy change of reaction to determine the amount of heat released:
ΔH = -852 kJ/mol * moles Fe2O3
ΔH = -852 kJ/mol * 0.972 mol
ΔH = -825.664 kJ
Therefore, the amount of heat released when 17.5 g of Al reacts with excess Fe2O3 is -825.664 kJ.
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