The IUPAC name for the given compound is "heptanal oxime."
What is heptanal oxime?Heptanal oxime, also known as heptan-2-one oxime, is an organic compound with the chemical formula C7H15NO. It is an oxime derivative of the ketone heptan-2-one. Heptanal oxime is a colorless to pale yellow solid that is sparingly soluble in water, but soluble in many organic solvents.
Heptanal oxime is used as a chemical intermediate in the production of various compounds, such as agrochemicals, pharmaceuticals, and fragrances. It is also used as a chelating agent to form stable complexes with various metals, such as copper and iron.
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Analysis of a 5.68-g sample of ZnS contains 3.80 g of Zn. Calculate the mass of Zn that can be obtained from 7.53 kg of Zns.
a.5.65 kg
b.5.04 kg
c.3.73 kg
d.2.87 kg
If a 5.68-g sample of ZnS contains 3.80 g of Zn then the mass of Zn that can be obtained from 7.53 kg of Zns. is 5.04kg so correct option is
(b) 5.04kg.
With the provided data, we can first determine the mass percent content of zinc in ZnS:
(Mass of Zn / Mass of ZnS) times 100% Equals mass percent of Zn
3.80 g / 5.68 g x 100%, where mass percent of Zn
Zn mass percentage is 66.9%.
This indicates that zinc accounts for 66.9% of the mass of ZnS. This number can be used to determine how much Zn can be extracted from 7.53 kg of ZnS:
mass of Zn from 7.53 kg of ZnS is equal to (66.9 / 100) × 7.53 kg, or 5.04 kg.
As a result, 5.04 kg of Zn can be extracted from 7.53 kg of ZnS. 5.04 kg is the correct answer (b).
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what is the balanced equation for
αHC2H3O2(aq)+βBa(OH)2(aq) →γH2O(l)+δBa(C2H3O2)2(aq)
Answer:
α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)
Explanation:
To balance the equation, you need to make sure that the number of atoms of each element on both sides of the equation are equal. The balanced equation for the reaction between α moles of acetic acid (HC2H3O2) and β moles of barium hydroxide (Ba(OH)2) to produce γ moles of water (H2O) and δ moles of barium acetate (Ba(C2H3O2)2) is:
α HC2H3O2 (aq) + β Ba(OH)2 (aq) → γ H2O (l) + δ Ba(C2H3O2)2 (aq)
The distance between the two hydrogen atoms in a molecule of water is 0.00000000172 m. Express this distance in scientific notation
A) 17.2 x10^9 m
B) 0.172 x 10^-10 m
C) 1.72 x 10^-10 m
D) 1.72 x10-9 m
E) 1.72 x 1010 m
The distance between the two hydrogen atoms in a molecule of water is 0.00000000172 m, 1.72x10⁻⁹ m is the distance in scientific notation.
Scientific notation is defined as a way of writing very large or very small numbers. A number is written in a very scientific notation when a number between 1 and 10 is multiplied by a power of 10. Let's consider for example, 650,000,000 can be written in scientific notation as 6.5 × 10⁸.
Distance is basically defined as the distance, or separation, between two objects. An example distance is 5 feet between two tables. Distance is a scalar quantity.
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What type of reaction is shown below:Ca(OH)2(aq) + HCl(aq)—>CaCl₂ + H₂O
Answer The reaction shown below is a chemical reaction between aqueous calcium hydroxide (Ca(OH)2) and aqueous hydrochloric acid (HCl):
Explanation:
Ca(OH)2(aq) + HCl(aq) -> CaCl2 + H2O
This reaction is an example of a neutralization reaction. Neutralization reactions occur when an acid reacts with a base to produce a salt and water. In this reaction, the hydrogen ions from the hydrochloric acid react with the hydroxide ions from the calcium hydroxide to produce calcium chloride (CaCl2) and water (H2O). The reaction results in the neutralization of both the acid and the base, hence the name "neutralization reaction."
1. How many atoms of nitrogen are there in 0. 50 mol of (NH4)2CO3?
A. 1
B. 2
C. 3. 01 × 1023
D. 6. 02 × 1023
There are[tex]6.02*10^{23}[/tex] atoms of nitrogen in 0.50 mol of (NH4)2CO3. The correct answer is D. [tex]6.02*10^{23}[/tex]
How to determine the number of atoms present in nitrogen?To determine the number of atoms of nitrogen in 0.50 mol of (NH4)2CO3, we first need to find the total number of moles of nitrogen in the compound.
(NH4)2CO3 contains two nitrogen atoms in each molecule, so the total number of moles of nitrogen is:
2 nitrogen atoms/molecule x 0.50 mol = 1.00 mol of nitrogen
We know that one mole of nitrogen contains Avogadro's number[tex](6.02 * 10^{23})[/tex] atoms of nitrogen. Therefore, 1.00 mol of nitrogen also contains [tex](6.02 * 10^{23})[/tex]atoms of nitrogen.
Therefore, there are [tex](6.02 * 10^{23})[/tex]atoms of nitrogen in 0.50 mol of [tex](NH4)2CO3.[/tex]
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If the earth is 1.50X108 Km from the sun, what is the distance
in Gm?
Answer:
1.50 Gm
Explanation:
The distance from the Earth to the Sun can be converted from kilometers to gigameters (Gm) by dividing by 10^9:
1.50 x 10^8 km / 10^9 = 1.50 Gm
So, the distance from the Earth to the Sun is 1.50 Gm.
ALLEN
Gas stoves and gas burners utilize methane gas (CH4) as a fuel. Its combustion reaction can be described by the following balanced chemical equation:
CH4 + 2 O2 → CO2 + 2 H2O
Cullen Airy is cooking a turkey for Thanksgiving dinner. He burns 2640 g of CH4 in the process. What mass of CO2 is produced during Cullen's turkey preparation?
in front of H2O for balance the hydrogen atoms: CH4 + O2 CO2 + 2H2O. A 2 can be placed Oxygen gas on the left to balance the oxygen atoms: CH4 + 2O2 Carbon dioxide + 2H2O. Now the equation balances.
Which balanced reaction was appropriate for methane combustion?The equation that balances is CH4(g)+2O2(g)CO2(g)+2H2O. (g) Methane (CH4) and oxygen (O2) combine during combustion to form carbon dioxide (CO2) and water (H2O): CO2 + 2 H2O CH4 + 2 O2 The laws of mass conservation is observed in this reaction because nothing was actually generated or destroyed, only rearranged.
What distinguishes a carbon molecule as primary, secondary, tertiary, or quaternary?According to the hierarchy of carbon atom attachments, primary carbon is only tied to one carbon atom, secondary carbon is only attachment to two carbon, tertiary carbon is only connected to carboxylic acid group, and quaternary chlorine is only linked to carbon rings.
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5. There are two types of bond cleavage: homolytic and heterolytic. In homolytic cleavage,
the two electrons in the bond are divided equally between the products. In heterolytic
cleavage, one atom gets both of the shared electrons. Show how the electrons in the
C-X bond in the compound L below are distributed in the bond cleavage to form:
a) Free radical
b) Carbocation
c) Carbanion
[6 marks]
C-X bond in the compound L below are distributed in the bond cleavage to form free radical.
How do bonds break?
When a bond is broken through heterolytic cleavage, also known as heterolysis, one of the fragments still has the shared pair of electrons from the original connection. Because it has both bonding electrons, one fragment acquires an electron while the other loses one. Another name for this procedure is ionic fission.
Any molecular species that has an unpaired electron in an atomic orbital and is capable of independent existence is referred to as a free radical. Most radicals exhibit certain similar characteristics when an unpaired electron is present. Many radicals are highly reactive and inherently unstable.
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How many liters would you need to make a 1 m solution if you have 6 mol of sodium hydroxide.
The liters would we need to make the 1 M solution if we have 6 mol of sodium hydroxide of 6 L.
The moles of the sodium hydroxide = 6 mol
The molarity of the sodium hydroxide = 1 M
The expression for the molarity is as follows :
The molarity = moles / volume in L
The volume of the sodium hydroxide = moles / molarity
The volume of the sodium hydroxide = 6 / 1
The volume of the sodium hydroxide = 6 L.
Thus the volume of the sodium hydroxide is 6L in the 1 M of the solution.
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A supersaturated solution can be prepared by dissolving solute in solvent while adding____. A supersaturated more servent solution contains more _____than can ordinarily be dissolved in the solvent detergent at room temperarte. A solution may remain supersaturated until_____is initiated, often by adding solid to the solution or by allowing solvent to evaporate.
By dissolving the solute in the solvent while adding heat, a supersaturated solution can be created. At room temperature, a supersaturated solution contains more solute.
than can normally be dissolved in the solvent. This is accomplished by dissolving the solute in a hot solvent and then progressively chilling the solution to allow the excess solute to stay dissolved, resulting in a supersaturated solution. A solution can stay supersaturated until a seed crystal is begun, which is usually accomplished by adding solid to the solution or allowing the solvent to evaporate. The seed crystal acts as a surface for surplus solute to crystallize and exit solution. The surplus solute quickly crystallizes out of solution once a seed crystal is introduced, resulting in a saturated solution.
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think about the sugar and water as made up of tiny particles
Both sugar and water are made of molecules and atoms.
What is meant by atoms and molecules?A tiny or very small particle of a chemical element is known as an atom, which may or may not present independently. Molecules are defined as a groups of atoms has the bond fuse together which represents the smallest part of a compound. Two or more identical or different atoms are chemically bonded with each other.
The smallest particle of a material that has all of the physical and chemical properties of the material. Molecules are made up of only one or more than one atom. Sugar has a solid state of matter whereas water has a liquid state of matter. Sugar which is a solid has more hard particles as compared to water whereas a liquid has less compact particles.
So we can conclude that both are made of molecules and atoms.
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See question in the picture below , will give brainliest for correct answer
The balanced equation for the chemical reaction is:
NH₄NO₃ -> N₂O + 2H₂O
How do I balance the chemical equation?The balancing chemical equation is done by doing a head count of the different element present on both sides of the equation to ensure the are the equal.
This however is in line with the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
Now, we shall the balance equation as shown below:
NH₄NO₃ -> N₂O + H₂O
There are 4 atoms of H on the left side and 2 on the right side. It can be balanecd by writing 2 before H₂O as shown below:
NH₄NO₃ -> N₂O + 2H₂O
Now the equationis balanced.
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Blast furnaces give off many unpleasant and unhealthy gases. If the total gas pressure is 0.99 atm, the partial pressure of carbon dioxide is 5.065 kPa, and the partial pressure of hydrogen sulfide is 015.2 mmHg, what is the partial pressure, in atmospheres, of the remaining air?
___________ atm (2 sig figs)
The partial pressure of the remaining air is 0.94 atm.
Solving for the of the remaining air, we have:First, we'll convert the partial pressure of hydrogen sulfide from mmHg to kPa:
015.2 mmHg * (101.325 kPa / 760 mmHg)
= 0.020 kPa
Next, we'll find the sum of the partial pressures of carbon dioxide and hydrogen sulfide:
5.065 kPa + 0.020 kPa
= 5.085 kPa
Now we'll convert this sum to atmospheres:
5.085 kPa * (1 atm / 101.325 kPa)
= 0.05 atm
Finally, we'll subtract this sum from the total gas pressure to find the partial pressure of the remaining air:
0.99 atm - 0.05 atm
= 0.94 atm
So the partial pressure of the remaining air is 0.94 atm (to 2 sig figs).
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For the reaction below, Kc = 1.10 × 10⁻⁴. Note Kc is sometimes called K.
What is the equilibrium concentration of C if the reaction begins with 0.200 M A and 0.300 M B?
2 A (aq) + B (aq) ⇌ C (aq)
Kc = 1.10 104 for the reaction detailed below. If the reaction starts with 0.200 M A with 0.150 M B, how much is the equilibrium level of C
What does the word reaction mean?
Chemical reaction is the transformation of one or more substances—the reactants—into one or more additional substances—the products. Chemical elements or chemical compounds make up substances.
Where do reaction take place?
The Earth's geology, the atmosphere, the oceans, and a wide variety of intricate processes that take place in all life processes are rife with chemical reactions. Physical changes and chemical must be differentiated.
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One atomic mass unit has a mass of 1.6605 × 10−24 g. What is the mass of one atom of sodium?
Answer:
one atom of sodium has a mass of approximately 37.9968 x 10^-24 grams.
Explanation:
The atomic mass of sodium is approximately 22.99 atomic mass units. To convert from atomic mass units to grams, we multiply by the conversion factor of 1.6605 x 10^-24 g/atomic mass unit:
mass (g) = 22.99 atomic mass units * (1.6605 x 10^-24 g/atomic mass unit) = 37.9968 x 10^-24 g
So one atom of sodium has a mass of approximately 37.9968 x 10^-24 grams.
Calculate the average atomic mass of funnium. One isotopes of funnium has an atomic mass of 78.92 u and a relative abundance of 50.69%. The other major isotope of funnium has an atomic mass of 80.92u
Answer:
89.17 u.
Explanation:
he average atomic mass of funnium can be calculated as follows:
Atomic mass = (Relative abundance of first isotope * atomic mass of first isotope) + (Relative abundance of second isotope * atomic mass of second isotope)
Atomic mass = (50.69% * 78.92 u) + (100% - 50.69% * 80.92 u)
Atomic mass = 39.86 u + (49.31 u)
Atomic mass = 89.17 u
So, the average atomic mass of funnium is 89.17 u.
There are three sets of sketches below, showing the same pure molecular compound (hydrogen chloride, molecular formula HCl) at three different temperatures. The sketches are drawn as if a sample of hydrogen chloride were under a microscope so powerful that individual atoms could be seen. Only one sketch in each set is correct. Use the slider to choose the correct sketch in each set. You may need the following information: melting point of HCl: -114.8 °C boiling point of HCl: -85.1 °C C A DODODODO 5 3. C -124. "C -105. C ? X
As per the temperature, the molecules of a substance act differently. The melting point is -114.2 °C and The boiling point of hydrogen chloride (HCl) is -85.05 °C. The correct sketch in each set is as follows:
Thus, if the temperature is kept above -85.05 °C, the molecules will be placed widely apart and will be in the gaseous state, revealing their properties.
If the temperature is between -114.2 °C and -85.05 °C, the molecules will be organized in layers capable of slipping over one another since they will be in a liquid state.
At last, the molecules will be arranged in an orderly manner because they will be in a solid state if the temperature is below -114.2 °C.
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Help! Rate constant k=0.23 /s in a first order reaction
The concentration at t = 300 s is 1.1 * 10^-30 M
What is the rate constant?The rate constant, also known as the reaction rate constant, is a constant of proportionality that relates the rate of a chemical reaction to the concentration of reactants. It is a measure of the speed at which a chemical reaction occurs and is dependent on temperature, pressure, and other physical and chemical factors.
The rate constant is represented by the symbol "k" and is usually expressed in units of reciprocal time, such as per second (s^-1).
We know that for the first order reaction;
ln[A] =ln [A]o - kt
[A] = final concentration at time t
[A]o = Initial concentration
k = rate constant
t = time taken
ln[A] = ln1 - 0.23 * 300
ln[A] = -ln69
[A] = e^-69
= 1.1 * 10^-30 M
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The base SI unit for molar mass is kgmol.
A. TRUE
B. FALSE
When 6.50 moles of Calcium oxide
decomposes, how many moles of oxygen
gas are produced.
2 CaO --> 2 Ca + O2
The term mole concept is used here to determine the moles of oxygen gas produced. When 6.50 moles of Calcium oxide decomposes, 3.25 moles of oxygen gas is produced.
What is mole?One mole of a substance is that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of carbon-12.
The given reaction is:
2 CaO → 2 Ca + O2
Here 2 moles of calcium oxide decomposes to give 2 moles of calcium and 1 mole of oxygen. So 6.50 moles CaO gives:
6.50 × 1 mol O₂ / 2 mol CaO = 3.25 mol O₂
Thus 3.25 mol O₂ is produced.
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The specific heat of water, 4.180 J·(g·K)−1, is greater than that of many other substances, such as aluminum, copper, and iron, which have specific heats of 0.902 J·(g·K)−1, 0.395 J·(g·K)−1, and 0.449 J·(g·K)−1, respectively. Which of the following statements about water can be attributed to this observation?
substances, such as aluminum, copper is measured in J/mole C rather than J/gC. 18.0 g/mole times 4.18 J/gC results in 75.2 J/moleC.
Is iron's specific heat higher than copper's specific heat?The key is to always keep in mind that the specific heat of copper is lower than that of iron. You need to keep in mind that the heat of metal is higher than the heat capacity of copper. As a result, we can state that Q is identical to Late Mr. Delta T.
Is water's specific heat 4.184?The temperature of the water equals 4.184 J/g-K due to the fact that there will be 4.184 megawatts in a calorie. Another way to define the ease that an item receives or loses heat.
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What’s the velocity of the sound wave at a temperature of 38 C
Answer:
The velocity of sound in air is dependent on several factors, including temperature, pressure, and humidity. At a temperature of 38°C (100.4°F), the average velocity of sound in air is approximately 343 meters per second (m/s). However, it is important to note that this is just an approximation and the actual velocity can vary depending on the specific conditions. To get a more precise value, you may need to consider the effect of pressure, humidity, and other factors.
A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. She uses 5 different widths of copper wire and attaches each to a multimeter to measure
the resistance in the wires. The data collected is shown below.
Wire 1-12 Ohms
Wire 2-17 Ohms
Wire 3-9 Ohms
Wire 4-14 Ohms
Wire 5-6 Ohms
What is the independent variable in this experiment?
A. The multimeter.
B. The resistance values.
C. The material of the wires, copper.
D. The widths of the wires.
A student runs an experiment to figure out if the size of a wire changes how well it conducts electricity. The independent variable in this experiment is the multimeter. Therefore, option A is correct.
What is resistance ?The amount by which an object impedes or resists an electric current is referred to as resistance. The flow of electrons is referred to as electric current. Consider an example of a person struggling to move from one shop to another in a crowded market.
Because a thin wire has fewer electrons to carry the current, its resistance is greater than that of a thick wire. The relationship between resistance and the area of a wire's cross-section is inversely proportional.
Thus, The independent variable in this experiment is the multimeter,option A is correct.
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the town in the video stressed using locally made goods instead of imported goods. how could using locally made goods lover CO2 emissions
The way that using locally made goods can lower CO2 emissions is by reducing the emissions from the transport needed to take foreign made goods to a place.
How do locally made good usage lower CO2 emissions ?The use of locally made goods can lower CO2 emissions by reducing the transportation distance needed to transport goods. When goods are manufactured and consumed locally, they do not need to be transported over long distances, which can greatly reduce the carbon emissions associated with transportation.
Transportation is a significant source of greenhouse gas emissions, particularly emissions from the burning of fossil fuels like gasoline and diesel. By reducing the amount of transportation needed, the use of locally made goods can help to lower the overall carbon footprint of an economy.
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Given the chemical equation: 6 Cs + N₂
-2 CsgN
If the above reaction produces 58.3g of cesium nitride how much of the other substances were involved?
According to law of conservation of mass, if mass of product is 58.3 g the mass of nitrogen is 28 g and that of cesium nitride is 30.3 g which sums up to 58.3 g.
What is law of conservation of mass?According to law of conservation of mass, it is evident that mass is neither created nor destroyed rather it is restored at the end of a chemical reaction .
Law of conservation of mass and energy are related as mass and energy are directly proportional which is indicated by the equation E=mc².Concept of conservation of mass is widely used in field of chemistry, fluid dynamics.
Mass of cesium nitride= mass of cesium + mass of nitrogen, thus, mass of nitrogen = 14×2=28 g and that of cesium is 58.3-28=30.3 g.
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How many moles of gas would it take to fill an average man's lungs, total capacity of which is about 4.5 L. Assume 1.00 atm pressure and 37 degrees C
Answer:
0.0144 moles
Explanation:
To calculate the number of moles of gas in a volume of 4.5 liters, we use the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we need to convert the temperature to Kelvin:
37°C = 37 + 273.15 = 310.15 K
Next, we can plug in the known values into the ideal gas law and solve for n:
PV = nRT
(1.00 atm)(4.5 L) = (n)(0.0821 Latm/mol K)(310.15 K)
n = (1.00 atm)(4.5 L) / [(0.0821 Latm/mol K)(310.15 K)] = 0.0144 moles
So, it would take approximately 0.0144 moles of gas to fill an average man's lungs.
ALLLEN
Answer:
0.124 moles
Explanation:
PV = nRT, can be used, where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature in Kelvin.
Converting the volume to liters and temperature to Kelvin:
V = 45 L
T = 37°C + 273.15 = 310.15 K
Plugging these values into the ideal gas law:
1.00 atm * 45 L = n * 0.0821 Latm/mol/K * 310.15 K
Solving for n:
n = (1.00 atm * 45 L) / (0.0821 Latm/mol/K * 310.15 K) = 0.124 mol
So, it would take about 0.124 moles of gas to fill an average man's lungs.
Estimate the number of photon emitted in one second from a LED lamp of 50 watts, if the band-gap energy of the LED is 2.0 eV and with 90% energy conversion from electricity to light energy
Number of photons emitted = 2167200 photons/second
What are photons emitted?Photons are particles of light that are emitted from atoms. They exist in a wide range of energies and wavelengths and can be emitted from both natural and artificial sources.
Photons are emitted when an electron in an atom moves from a higher energy state to a lower energy state.
1. Number of photons emitted = (Energy conversion efficiency) × (Power in Watts) × (eV/J) × (Avogadro's number) × (1/Energy of band gap)
Number of photons emitted = (0.9) × (50) × (1.6 x 10-19/1) × (6.02 x 1023) × (1/2.0)
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PLEASE HELP
Calculate the number of oxygen atoms in a 120.0 g sample of forsterite (Mg2SiO4).
Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits.
Answer:
The molar mass of Mg2SiO4 can be calculated by adding the atomic masses of each element:
Mg: 2 x 24.31 g/mol = 48.62 g/mol
Si: 1 x 28.09 g/mol = 28.09 g/mol
O: 4 x 16.00 g/mol = 64.00 g/mol
Molar mass of Mg2SiO4 = 48.62 + 28.09 + 64.00 = 140.71 g/mol
To calculate the number of oxygen atoms in a 120.0 g sample of forsterite, we first need to calculate the number of moles of Mg2SiO4 in the sample:
n = mass / molar mass = 120.0 g / 140.71 g/mol = 0.853 mol
Next, we can use the molecular formula to determine the number of oxygen atoms in one mole of Mg2SiO4:
Mg2SiO4 has 4 oxygen atoms per molecule, so one mole of Mg2SiO4 has 4 moles of oxygen atoms.
Therefore, the number of oxygen atoms in 0.853 mol of Mg2SiO4 is:
0.853 mol Mg2SiO4 x 4 mol O / 1 mol Mg2SiO4 = 3.412 mol O
Finally, we can convert the number of oxygen atoms to a more convenient unit, such as atoms. One mole of oxygen atoms contains 6.022 x 10^23 atoms, so the total number of oxygen atoms in 0.853 mol of Mg2SiO4 is:
3.412 mol O x 6.022 x 10^23 atoms/mol = 2.055 x 10^24 atoms of oxygen
Rounding this result to 4 significant digits, we get:
2.055 x 10^24 atoms of oxygen (to 4 significant digits)
Explanation:
Given AH -86 kJ/mol and AS° = -478 J/mol K, determine AG and the spontaneity of the reaction A,(g) + 3 X₂(g) → 2 AX,(g) at 591 K.
A) +196 kJ/mol, spontaneous
B) +196 kJ/mol, nonspontaneous
C) +282 kJ/mol, nonspontaneous
D) +282 kJ/mol, spontaneous
E) -196 kJ/mol, spontaneous
a brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, which one rusted first if lead stayed on the longest and copper for the least
A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.
What is rust?Rust is an iron oxide, which is a typically reddish-brown oxide created by the catalytic interaction of iron with oxygen in the absence of water or air moisture. Rust is often connected with the corrosion of refined iron and is composed of hydrous iron(III) oxides (Fe2O3nH2O) with iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3).
Given enough time and the presence of oxygen and water, any iron mass may ultimately rust completely. A brass rod, a copper rod, an iron rod and a lead rod went into water with wax on top, an iron rod will rust first if lead stayed on the longest and copper for the least.
Therefore, an iron rod will rust first if lead stayed on the longest and copper for the least.
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