The mass of iron formed when 591 kJ of heat is released is approximately 78 g.
To solve this problem, we need to use the concept of stoichiometry and the given enthalpy change.
First, we need to write a balanced chemical equation for the reaction:
2 Al (s) + Fe2O3 (s) → 2 Fe (s) + Al2O3 (s)
According to the stoichiometry of the reaction, 2 moles of Fe are produced for every 1 mole of Fe2O3 reacted.
Next, we can use the given enthalpy change to calculate the amount of heat released when 1 mole of Fe2O3 reacts.
ΔH = -850 kJ/mol Fe2O3
If 850 kJ of heat are released when 1 mole of Fe2O3 reacts, then 591 kJ of heat would be released when:
591 kJ x 1 mol Fe2O3 / -850 kJ = -0.696 mol Fe2O3
Since the reaction produces 2 moles of Fe for every 1 mole of Fe2O3 reacted, the amount of Fe produced would be:
2 mol Fe x 0.696 mol Fe2O3 = 1.392 mol Fe
Finally, we can calculate the mass of Fe produced using its molar mass:
1.392 mol Fe x 55.85 g/mol Fe = 77.9 g
So, the correct answer is 78 g.
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Vhich statement describes the hydrogen bonds in an ethanol molecule?
point)
O
All six hydrogen atoms are capable of forming hydrogen bonds. A dipole forms between the hydrogen atoms and the carbon or
oxygen atoms.
O
Only the hydrogen atoms attached to the carbon tO atoms are capable of forming hydrogen bonds. A dipole does not form between the
hydrogen and oxygen atoms.
•
All SiX hydrogen atoms are capable of forming hydrogen bonds. A dipole forms between the hydrogen and oxygen atoms, but not
between the hydrogen and carbon atoms.
Only the hydrogen atom attached to the oxygen LO atom is capable of forming hydrogen bonds. A dipole does not form between the
hydrogen and carbon atoms.
Hydrogen bonds can only be created by the hydrogen atom that is bound to the oxygen atom. Between the atoms of hydrogen and carbon, no dipole exists.
Why do ethanol molecules establish hydrogen bonds with one another?Water and ethanol form weak hydrogen bonds with aromatic hydrogen atoms and strong hydrogen bonds with the hydroxyl, carbonyl, and ether groups in chrysin/galangin. Chrysin and galangin interact more strongly with H2O than CH3CH2OH, with the exception of the structures A and B.
The hydrogen bond in ethanol is where?It has been discovered that hydrogen bonds between ethanol molecules and lipid phosphate oxygen atoms can be formed and can be as strong as hydrogen bonds between lipid phosphate oxygen atoms and water molecules.
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The integrated area under an NMR signal is proportional to the ______ of protons that give rise to that signal. The areas are integrated automatically to give an integral for each peak. The integral values give the ______ of protons in the compound.
The integrated area under an NMR signal is proportional to the number of protons (or hydrogen atoms) that give rise to that signal. The areas are integrated automatically to give an integral for each peak. The integral values give the number or quantity of protons in the compound.
In Nuclear Magnetic Resonance (NMR) spectroscopy, the integrated area under a signal is proportional to the number of protons (or hydrogen atoms) that give rise to that signal. The NMR spectrum provides information about the environment of the protons in a compound, and the intensity or area of each peak reflects the number of protons in that environment.
The area under each peak is integrated automatically to give an integral value, which is directly proportional to the number of protons that give rise to the peak. Therefore, the integral values can be used to determine the ratio of different types of protons in the compound, which is useful for identifying the compound and elucidating its molecular structure.
In summary, the integrated area under an NMR signal is proportional to the number of protons, and the integral values give the quantity or number of protons in the compound.
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how many c atoms are there in (a) 1 g of (b) 1 mole (c) 1 kmole of in each case what fraction of the atoms are c atoms, and what fraction of the mass is c
In (a) 1 g of carbon, there are 6.022 x 10^23 atoms of carbon. This means that the fraction of atoms that are carbon atoms is 1, and the fraction of the mass that is carbon is also 1.
In (b) 1 mole of carbon, there are 6.022 x 10^23 atoms of carbon. This means that the fraction of atoms that are carbon atoms is 1, and the fraction of the mass that is carbon is 12/44 (12g out of 44g).
In (c) 1 kmole of carbon, there are 6.022 x 10^26 atoms of carbon. This means that the fraction of atoms that are carbon atoms is 1, and the fraction of the mass that is carbon is 12,000/44,000 (12,000g out of 44,000g).
In all cases, the fraction of atoms that are carbon atoms is 1, since a mole is a unit of the number of atoms, and carbon atoms are the only type of atom present. The fraction of mass that is carbon is different in each case, since the mass of a mole of carbon is 12g, whereas the mass of a kmole of carbon is 12,000g.
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4. What is free energy?
Answer:
A thermodynamic quantity equivalent to the capacity of a system to do work.
Explanation:
HELP ME PLEASEEEE
The student produced less magnesium oxide than expected.
Suggest two reasons why.
There could be several reasons why a student produced less magnesium oxide than expected. Here are two possibilities: Incomplete reaction, Loss of product
Incomplete reaction: Magnesium oxide is produced when magnesium metal is heated in the presence of oxygen. However, if the reaction is incomplete, then less magnesium oxide will be produced. One reason for incomplete reaction could be that the temperature was not high enough to provide the necessary activation energy.
Loss of product: It is possible that some of the magnesium oxide that was produced was lost during the experiment. For example, if the magnesium oxide was not handled carefully after it was produced, it may have been spilled or blown away.
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Aspirin is one of the Aesthetic Values of biodiversity
true
false
Answer:
true
Explanation:
Answer:
its true
Explanation:
you know Aspirin is one of the Aesthetic Values of biodiversity is true
hope it help to you and goodluck next time
calculate the percentage by mass of acetic acid in vinegar if it takes 24.5 ml of 0.299 m naoh to neutralize 8.55 grams of vinegar
The percentage by mass of acetic acid is 5.14%
What is percentage by mass?
It is defined as ratio of mass of substance to the mass of all substance multiply by 100.It is way to express concentration.
CH3COOH+NaOH= CH3COONa+H2O
we have 1 mole of acid for 1mole of base
Now , C=n/V
C= 0.299M ( its M not m so correct question)
V= 24.5 mL
no of moles = 0.299moles/L × 0.0245 L = 0.00733 moles
for neutralization of 0.00733 moles of Noah require 0.00733 moles of CH3COOH
given mass of acetic acid = no. of moles × molar mass
0.00733×60g/mole = 0.4398g
% mass of acetic acid =[ 0.4398g/8.55g]×100
⇒ 5.14%
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Elements in Group IIA (also known as Group 2, or the alkaline earth metals) have similar properties because they all have the same number of ____
(multiple choice)
A. valence electrons
B. electrons
C. electrons needed to fill their octet
D. electron shells
Answer:
Electrons in their outer shell
Explanation:
They have similar properties they have the same number of electrons in their outermost shell.
what force was applied to an object if 35 j of work was done and the object moved 7 m?
5N force was applied to an object if 35 j of work was done and the object moved 7 m
A force is an effect that can alter an object motion according to physics and an object with mass can change its velocity or accelerate as a result force and also force is as push or pull and work done by the force on an object means assuming that direction of the force is parallel to the displacement of the object
Then the formula is
W = f × d
Where f is the magnitude of force and d is the displacement of the object
Then W = 35 J is the work done and
d = 7m is the displacement of the object
So rearrange the equation then
F = 35/7 = 5N
5N force was applied to an object if 35 j of work was done and the object moved 7 m
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why do many parts of the world need resources of water different from the ones used in United Kingdom?
Answer:
Public water supply and sanitation in the United Kingdom is characterised by universal access and generally good service quality[citation needed]. A salient feature of the sector in the United Kingdom compared to other developed countries is the diversity of institutional arrangements between the constituting parts of the UK (England and Wales; Scotland; and Northern Ireland), which are each described in separate articles, while this article is devoted to some common issues across the United Kingdom.
A certain element has a half-life of three years.
If you currently have a 10g sample of that element and you know that it has undergone five half-life decays, how many grams of the element were in the sample originally?
A
150g
B
160g
C
320g
D
50g
(C) 320 g
Explanation:
A = A02^(-t/hl)
where hl = half-life
A0 = original amount
A = present amount
t = elapsed time = 5 half-lives
10g = A02^(-5) = A0/32
A0 = 32×(10 g) = 320 g
4Fe+ 3O2 > 2Fe2O3 To produce 3 moles of Fe2O3 how many moles of Fe must be reacted?
Answer: 6 mol Fe
Explanation: For every 2 mol of Fe2O3, 4 mol of Fe react. That means for every mol of Fe2O3, 2 mol of Fe react. 3 mol Fe2O3 require 6 mol Fe.
Write the electron configuration for an atom that has 17 electrons.
how many peaks would be generated from a mass spectrometer when analyzing bromine gas?
When analyzing bromine gas using a mass spectrometer, two peaks would be generated.
A mass spectrometer is an analytical instrument used to determine the molecular weight and structural information of a substance. It operates by ionizing the sample molecules and then separating them based on their mass-to-charge ratio. In the case of bromine gas (Br2), it consists of two bromine atoms bonded together.
When bromine gas is introduced into the mass spectrometer, it undergoes ionization, typically by electron impact ionization. This process results in the formation of positively charged bromine ions (Br+). Since bromine gas contains two bromine atoms, two Br+ ions are produced.
These ions then enter the mass analyzer, where they are separated based on their mass-to-charge ratio. The mass spectrometer measures the mass of the ions, and this information is displayed as peaks in the resulting mass spectrum. Since bromine gas generates two Br+ ions, two distinct peaks would be observed in the mass spectrum when analyzing bromine gas.
Therefore, when bromine gas is analyzed using a mass spectrometer, two peaks would be generated, representing the two Br+ ions produced during ionization.
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what are the two ways in which the physical state of matter can be changed
The two ways in which the physical state of matter can be changed are melting and freezing.
Melting is the process by which a solid substance transitions to a liquid state. As a result, the energy added to the solid substance causes the molecules to vibrate at a higher rate. As a result, the heat breaks the bonds between the molecules, allowing them to flow freely.Freezing is the process by which a liquid substance transitions to a solid state. As a result, energy is removed from the liquid substance. The molecules in the substance are moving quickly, but when energy is removed, they slow down.Because of the decrease in energy, the molecules can no longer slide past one another and form a rigid structure, resulting in a solid state of matter.For such more questions on physical state
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g/cm3 is a unit of density. Density is which type of property.
Question 3 options:
physical; extensive
chemical; intensive
physical; intensive
chemical; extensive
Answer:
Its the second one.
Explanation:
I just looked it because it didnt make sense at first.
Identify the molecular geometry corresponding to each expected bond angle around the central atom.
a. Linear b. Trigonal pyramidal c. Trigonal planar d. Tetrahedral
In Linear molecular geometry, the bond angle is 90°, in trigonal pyramidal geometry, bond angle is 107°, in trigonal planar geometry, bond angle is 120° and in tetrahedral, the bond angle is 109.5°.
In the linear geometry, the central atom has two side atoms attached which are at and bond angle of 180°.
In trigonal pyramidal geometry, the central atom has four side atoms which resembles a pyramid like structure. The bond angle between the two consecutive side atoms is 107°.
In trigonal planar geometry, three atoms are attached on the sides of central atom. The bond angle between these side atom is equal and of 120°.
In Tetrahedral geometry, the central atom and the side atoms makes a triangular prism like structure, the bond angle between side atoms is 109.5°.
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Magnesium lon has less electrons than its atom
True
False
an oxygen sample has a volume of 4.50 L at 27 and 800.0 torr. How many oxygen molecules does it contain g
An oxygen sample has a volume of 4.50 L at 27 and 800.0 torr. The oxygen sample contains 1.326 x 10²³ oxygen molecules.
Given:
P = 800.0 torr
V = 4.50 L
R = 0.0821 L·atm/(mol·K)
T = 300.15 K
Use the ideal gas law equation:
PV = nRT
Where:
P = pressure (in atm)
V = volume (in liters)
n = number of moles
R = gas constant (0.0821 L·atm/(mol·K))
T = temperature (in Kelvin)
Convert the temperature from degrees Celsius to Kelvin:
27 °C + 273.15 = 300.15 K
n = PV / RT
To convert torr to atm, we divide by 760 (since 1 atm = 760 torr):
800.0 torr / 760 = 1.0526 atm
n = (1.0526 atm) * (4.50 L) / (0.0821 L·atm/(mol·K)) * (300.15 K)
n = 0.2206 mol
Number of molecules = n × Avogadro's number
Number of molecules = 0.2206 mol * (6.022 x 10²³ molecules/mol)
Number of molecules = 1.326 x 10²³ molecules
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Which of the following elements has the same number of valence electrons as aluminum?
zinc
carbon
silicon
magnesium
or boron
Answer:
boron
Explanation:
Boron and aluminum lie in same group in modern periodic table and both have three valence electrons
What type of a solution is 60g NaNO3 at 40°C in
100g H202
Answer:
Explanation:
Saturated solution
If you have 83.2g of Fe and 110.0g of H,0 then which one is the limiting reactant and which one is in excess.
Answer:
Explanation:
For every two moles of H2O, one mole of H2 is produced. 3) Na runs out first. It is the limiting reagent. Water is the excess reagent.
A yellow-gold sphere has a mass of 15.2g when passed in the orange liquid the volume was 43ml
A yellow-gold sphere has a mass of 15.2 g when passes in the orange liquid with volume 43 mL
Density= mass/volume
Density = 15.2 g/ 43mL
Density = 0.35 g/mL
Question is to find density
What explanation from the evidence within the chemical equation BEST supports the idea that matter is conserved in a chemical reaction? A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products. B There are the same number of elements in the reactants as there are in the products. C More reactants, hydrogen and oxygen, were added to make the product, water. D Two reactants, hydrogen and oxygen, combined to make one product, water.
Answer:
A There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.
Explanation:
Matter is conserved in a chemical equation if there are no loss of atoms. That means, total number of atoms of elements must be the same as the total number of element on the product side. The correct option is;
A. There are the same number of atoms of oxygen and hydrogen in the reactants as there are in the products.
Answer:
its A. i just did dat
a certain half-reaction has a standard reduction potential 0.07 v. an engineer proposes using this half-reaction at the anode of a galvanic cell that must provide at least of electrical power. the cell will operate under standard conditions. note for advanced students: assume the engineer requires this half-reaction to happen at the anode of the cell.
The cathode half cell will have no maximum reduction potential and the engineer can choose an appropriate cathode that will deliver atleast 0.13V or more power
What is a cathode ?
An electrical device with polarized current has a metallic electrode called a cathode through which current is discharged. The electrode in a polarized electrical device via which current enters from an external circuit is known as an cathode, on the other hand.
what is an half-reaction?
The portion of a larger reaction known as a half-reaction constitutes either an oxidation or a reduction on its own. For a redox reaction to be fully described, it requires two half-reactions, one oxidation and one reduction.
The given half cell will work as the anode of the galvanic cell. Oxidation occurs at the anode and the standard oxidation potential E0ox = -E0red. Therefore, the given half cell will have oxidation potential E0ox = -(-1.07 V) = +1.07 V.
The cell potential is given as E0cell = E0red + E0ox and the cell potential will have a value of atleast 1.20 V. Therefore, put E0cell = 1.20 V and get
E0red = E0cell – E0ox = (1.20 V) – (1.07 V) = 0.13 V.
If the cathode half cell has a reduction potential less than 0.13 V, then the cell potential of the galvanic cell will fall below 1.20 V. Hence, the cathode half cell must have a minimum standard reduction potential of +0.13 V
The cell is supposed to deliver atleast 1.20 V power. However, the cell can deliver more than 1.20 V power. Say, the cell delivers 1.30 V power. Then putting E0cell = 1.30 V, we have,
E0red = (1.30 V) – (1.07 V) = 0.23 V.
Hence, the cathode half cell will have no maximum reduction potential and the engineer can choose an appropriate cathode that will deliver atleast 0.13V or more power.
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Can a single absorption band distinguish between water vapor
and Carbon Dioxide in the gas phase?
A single absorption band is not sufficient to distinguish between water vapor and carbon dioxide in the gas phase.
In the gas phase, both water vapor (H2O) and carbon dioxide (CO2) exhibit multiple absorption bands in the infrared region of the electromagnetic spectrum. Each molecule has its unique set of vibrational and rotational modes, which result in specific absorption frequencies. While there may be some overlap in the absorption bands of water vapor and carbon dioxide, their distinct molecular structures and vibrational characteristics lead to different absorption patterns.
To accurately differentiate between water vapor and carbon dioxide, multiple absorption bands need to be examined. Spectroscopic techniques such as infrared spectroscopy or laser absorption spectroscopy can be employed, where the absorption spectra of the gases are compared with known reference spectra or analyzed using computational methods. By examining the absorption peaks and their corresponding wavelengths, it becomes possible to identify the presence of water vapor or carbon dioxide and determine their respective concentrations.
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How many grams of Ba(OH)2 would be made from 9.62 x 10^24
The mass of the solid is 2733 g
What is the moles?The mole is a useful unit of measurement in chemistry because it allows scientists to easily compare the amounts of different substances in chemical reactions. By knowing the molar amounts of the reactants and products in a chemical reaction, scientists can calculate important information such as the mass of products formed, the amount of energy released or absorbed, and other key chemical properties.
We know that;
1 mole of the compound would contain 6.02 * 10^23 molecules
x moles of the compound will contain 9.62 x 10^24 molecules
x= 15.98 moles
Then;
Mass = 15.98 moles * 171 g/mol
= 2733 g
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A 50 kg girl rode her 12 kg bicycle in a race. She started from rest and then peddled with a velocity of 10 m/s. What is the change in kinetic energy of the girl and her bicycle?
The initial kinetic energy is zero because the girl was at rest. The final kinetic energy is thus, 3100 J. Therefore, the change in kinetic energy is 3100 J
What is kinetic energy ?Kinetic energy of an object is generated by virtue of its motion. It is related to the mass and velocity of the object as follows:
Ke = 1/2 mv²
Given that, mass of girl = 50 kg
mass of bicycle = 12 kg.
total mass = 62 kg.
velocity = 10 m/s.
Then initial kinetic energy = 0 since v = 0.
Then, ΔKe = 1/2 62 kg × (10 m/s)² - 0 = 3100 J
Therefore, the change in kinetic energy of the girl is 3100 J.
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what is the role of detergent, ethanol, and salt in the extraction process?
Detergent, ethanol, and salt can all play important roles in extraction processes, depending on the specific type of biomolecule being extracted and the purification needs.
Detergent, ethanol, and salt can all play important roles in different types of extraction processes. Here's an overview of how each of them can be used:
Detergent: Detergents are often used to extract proteins or other biomolecules from biological samples. Detergents are able to solubilize membrane-bound proteins by disrupting the lipid bilayer of the cell membrane. This allows the proteins to be extracted into a solution. Detergents can also help to break apart protein complexes, making it easier to isolate individual proteins.
Ethanol: Ethanol is commonly used as a solvent in extractions because it can dissolve a wide range of organic compounds, including lipids and proteins. Ethanol can also be used to precipitate DNA or RNA from a solution. When added to a solution of DNA or RNA, ethanol causes the nucleic acids to clump together and form a visible precipitate, which can then be collected and further purified.
Salt: Salt is often used in DNA and RNA extractions to help remove proteins and other impurities from the sample. When salt is added to a solution, it can cause proteins to denature and precipitate out of the solution. The salt can then be removed along with the precipitated proteins. In addition, salt can help to bind DNA or RNA to a solid support, such as a column or a membrane, making it easier to isolate the nucleic acid from other components of the sample.
In summary, detergent, ethanol, and salt can all play important roles in extraction processes, depending on the specific type of biomolecule being extracted and the purification needs. Detergents are useful for solubilizing proteins, ethanol can dissolve a wide range of organic compounds, and salt can help to remove impurities and bind DNA or RNA to a solid support.
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Many enzymes are inhibited irreversibly by heavy metal ions such as Hg2+ , Cu2+ , or Ag+ , which can react with essential sulfhydryl groups to form mercaptides. Enz−SH+Ag+⟶Enz−S−Ag+H+ The affinity of Ag+ for sulfhydryl groups is so great that Ag+ can be used to titrate −SH groups quantitatively. To 10.0 mL of a solution containing 3.4 mg/mL of a pure enzyme, an investigator added just enough AgNO3 to completely inactivate the enzyme. A total of 0.134 μmol AgNO3 was required. Calculate the minimum molecular weight (????r) of the enzyme.
Answer:
Explanation:
one mole of AgNO₃ reacts to inactivate one mole of enzyme
mg of enzyme in 10 mL = 3.4 x 10 mg = 34 mg .
required AgNO₃ = .134 x 10⁻⁶ mole
.134 x 10⁻⁶ mole AgNO₃ is required for inactivating 34 mg of enzyme
1 mole of AgNO₃ will be required for inactivating 34 / (.134 x 10⁻⁶ ) mg of enzyme
= 253.73 x 10⁶ mg of enzyme
= 253.73 x 10³ g of enzyme
Mol weight of enzyme = 253.73 x 10³ .