a) The amount of N₂O₅ is lowered to 2.5 g during the course of around 4.41 × 10⁴ seconds or 12.25 hours.
b) 9.71 L of O₂ are generated at 745 mmHg and 45 °C.
How to find quantity?a) To solve for the time required for the quantity of N₂O₅ to be reduced to 2.5 g, use the first-order integrated rate law:
ln[N₂O₅]t/[N₂O₅]0 = -kt
where [N₂O₅]t = concentration of N₂O₅ at time t, [N₂O₅]0 = initial concentration of N₂O₅, k = rate constant, and t = time.
Find the initial concentration of N₂O₅:
n(N₂O₅) = m/M = 80.0 g / 108.01 g/mol = 0.7413 mol
[N₂O₅]0 = n/V = 0.7413 mol / 0.153 L = 4.846 M
where M = molar mass of N₂O₅ and V = volume of the solution.
Substituting the given values into the equation:
ln([N₂O₅]t / 4.846 M) = -6.2×10⁻⁴ s⁻¹ × t
When the quantity of N₂O₅ is reduced to 2.5 g, the concentration is:
n(N₂O₅) = m/M = 2.5 g / 108.01 g/mol = 0.02314 mol
[N₂O₅]t = n/V = 0.02314 mol / 0.153 L = 0.151 M
Substituting this concentration into the equation and solving for t:
ln(0.151 M / 4.846 M) = -6.2×10⁻⁴ s⁻¹ × t
t = 4.41 × 10⁴ s
Therefore, it takes approximately 4.41 × 10⁴ seconds or 12.25 hours for the quantity of N₂O₅ to be reduced to 2.5 g.
b) The balanced equation for the reaction shows that 1 mole of N₂O₅ produces 1/2 mole of O₂:
N₂O₅ → N₂O₄ + 1/2 O2
Therefore, the number of moles of O₂ produced can be calculated using the stoichiometry:
n(O₂) = 1/2 × n(N₂O₅) = 1/2 × 0.7413 mol = 0.3707 mol
The ideal gas law can be used to calculate the volume of O₂ produced at 745 mmHg and 45°C:
PV = nRT
where P = pressure, V = volume, n = number of moles, R = gas constant, and T = temperature in Kelvin.
Convert the pressure to atm and the temperature to Kelvin:
P = 745 mmHg / 760 mmHg/atm = 0.980 atm
T = 45°C + 273.15 = 318.15 K
Substituting the values and solving for V:
V = nRT/P = (0.3707 mol) × (0.08206 L·atm/mol·K) × (318.15 K) / (0.980 atm) = 9.71 L
Therefore, the volume of O₂ produced at 745 mmHg and 45°C is 9.71 L.
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What is the wavelength of light with a frequency of 3.215 x 10^15 s-¹?
A. 9.325 x 10^-8m
B. 3.110 x 10^-16m
C. 1.072 x 10^7 m
D. 9.639 x 10^23m
The wavelength of the light will be 9.63 × 10²³ m .The wavelength of the wave is calculated using the frequency formula.
The quantity of cycles finished in a certain amount of time is known as frequency. It also indicates the number of crests that pass past a specific position in a unit of time. It is often referred to as the reciprocal of time. Hertz are used to express frequency (Hz). The frequency of the wave is calculated using the frequency formula.
The total number of times a repeated event occurs in a unit of time is known as its frequency. Depending on the quantities known, various frequency formulas exist to calculate frequency. The terms frequency (f), time period (T), wave speed (V), and wavelength () are all found using the formula for the frequency of a wave.
We know that ,
Frequency= Speed of light/ wavelength
Wavelength= Frequency × Speed of light
= 3.215 ×10¹⁵ × 2.997× 10⁸
= 9.639 × 10²³ m
The wavelength will be obtained by frequency -wavelength formula a and it will come as 9.63 × 10²³ m .
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4. Long answer type questions: a. b. C. d. e. f. g. h. j. i. What are the constituent gases of air? Why is the surrounding air not seen with the eyes? How do you prove that air supports burning? How do you show that air occupies space? How do you prove that air has weight? How is air useful to us? Mention any three points. Write any three properties of air. How can you say that air exerts force? Write any four effects of air pollution. Write any three causes of air pollution and any two control measures of it.
1. The constituent gases of air are:
Nitrogen Oxygen Argon Carbon Dioxide2. The surrounding air is not seen with the eyes because it is transparent. Air molecules are not visible to the na-ked eye, and they do not scatter or absorb visible light significantly. Therefore, air appears colorless and transparent.
What is air?3. To prove that air supports burning, you can perform an experiment with a burning candle. Place a glass jar or bell jar over a lit candle, ensuring that the jar is airtight. As the candle burns, it consumes oxygen from the air inside the jar. Eventually, the candle flame will go out due to the lack of oxygen, proving that air (specifically oxygen) is necessary for burning.
4. To show that air occupies space, you can perform a simple experiment using a plastic bottle or syringe. Fill the bottle or syringe with water, ensuring there are no air bubbles. Then, cover the opening tightly and try to compress the air inside. You will find that it is not possible to compress the air significantly, indicating that air occupies space.
5. To prove that air has weight, you can use a sensitive balance or scale. Weigh an airtight container or balloon, and then fill it with air. The weight of the container or balloon with the added air will be greater than its initial weight, demonstrating that air has weight.
6. Air is useful to us in various ways. Three points highlighting the importance of air are:
Breathing and RespirationCombustion and Energy ProductionClimate Regulation7. Three properties of air include:
Air is Compressible: Air can be compressed or expanded under different conditions, allowing it to fill various spaces and containers.Air has Mass: Air molecules have mass, which means air itself has weight. It exerts pressure on objects and surfaces.Air Exerts Pressure: Due to the collisions of air molecules with surfaces, air exerts pressure in all directions. This pressure is known as atmospheric pressure.Air exerts force in various ways. For example, air pressure allows objects like airplanes to fly by providing lift. Air resistance or drag opposes the motion of objects moving through the air, creating a force that can affect their speed and trajectory.
8. Four effects of air pollution include:
Respiratory ProblemsEnvironmental Damage:Climate ChangeHuman Health Impacts9. Causes of pollution:
Industrial EmissionsVehicle EmissionsResidential and Agricultural Activities10. Two control measures for air pollution include:
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What is the formula for Mercury (I) Bisulfate?
Answer:
Work shown below!
Explanation:
\(Hg^{+1} HSO_{4} =HgHSO_{4}\)
The half-life of carbon-14 is 5715 years. How long would it take for 100 grams to decay to
12.5 grams
We are given:
half-life of carbon = 5715 years
Initial mass = 100 grams
Final mass = 12.5 grams
Finding the time taken:
Number of half-lives:
We know that in the relation:
\(\frac{Final\_mass}{Initial\_mass} = \frac{1}{2^{n}}\), n is the number of half-lives taken
replacing the given values:
12.5 / 100 = 1/2ⁿ
1/8 = 1/2ⁿ
2ⁿ = 8
2ⁿ = 2³
n = 3
Hence, it took 3 half-lives to reduce the mass to 12.5 grams
Number of years:
Time taken = 3 half-lives
we know that one half-life is 5715 years, replacing that value:
Time taken = 3*(5715) years
Time taken = 17145 years
Therefore, after 17145 years, a 100 gram sample of carbon will decay and only 12.5 grams will remain
Question 6
Simplify the following expression
-3 + 4(a - 3b + 2) - 514 - a + 3b)
which has the lowest number of valence electrons? and how many does each have?
Mg2+
Ga+
Ar+
C+
S2-
F-
Fluorine (F-) is the element with the fewest valence electrons. Seven electrons make up the outermost shell of fluorine, and one of them is unpaired. As a result, fluorine possesses seven valence electrons altogether.
Eight valence electrons are present in magnesium (Mg2+), nine are present in gallium (Ga+), eight are present in argon (Ar+), four are present in carbon (C+), six are present in sulphur (S2-), and seven are present in fluorine (F-).
Fluorine has a lower number of valence electrons than the other elements because it has a greater effective nuclear charge. This indicates that the fluorine atom will take electrons away from its outermost shell since it is more attracted to electrons than the other elements.
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what is periodic table
I understand how a change in the size of the moon jellies' resource population can change the number of births in the moon jelly population.
Responses
Explain your answer choice.
A change in the size of the moon jellies' resource population can change the number of births in the moon jelly population because the big size of the resources can produce more births.
How do moon jellies reproduce?When there is more energy storage molecules present in the moon jellies, they can reproduce more, in more births. Fewer deaths would also lead to the jelly population increasing. The sea turtle population, and the moon jellies consumer population is also decreased.
There must be a change to the birth rate or the death rate in the moon jelly population. Within a population, organisms are born and dying continuously. If the number of births and deaths in a given time interval are equal, then the population size will remain stable.
So we can conclude that a large population of resources will lead to more births.
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Denver is located exactly one mile above sea level, which means the normal atmospheric
pressure is less than 1 atm. As a result, does water boil at a lower temperature or a higher
temperature in Denver?
Answer:
the answer is pressure is less then 1atm
Explanation:
Denver is located exactly one mile above sea level, which means the normal atmospheric pressure is less than 1 atm. As a result, water boil at a lower temperature of 95 degree Celsius.
What is atmospheric pressure?
There are small molecules of air in the atmosphere and these molecules combine and forms different layer in the atmosphere which creat some kind of pressure.
The pressure create by the air molecule layer is known to be the atmospheric pressure which is exerted or eel by the everything in the atmosphere and less pressure will decreases the temperature for water boiling point.
Therefore, boil at a lower temperature of 95 degree Celsius as Denver is located exactly one mile above sea level, which means the normal atmospheric pressure is less than 1 atm.
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which gas is fossil fuel
Answer:
methane
Explanation: methane is obtained from the decaying of flora and fauna mostlyunder damp
Why does it mean by methane molecule is symmetrical?
A methane molecule (CH4) is considered symmetrical because it possesses a symmetric structure and exhibits symmetry operations.
Symmetry refers to a balanced arrangement of elements that can be divided into equal parts by a plane, axis, or center. In the case of methane, it exhibits several symmetrical characteristics.
Firstly, methane has a tetrahedral molecular geometry, with the carbon atom at the center and four hydrogen atoms positioned around it. This geometry ensures that the molecule is symmetrical in terms of its spatial arrangement.
Each hydrogen atom is located at one of the vertices of the tetrahedron, forming equal angles and distances with respect to the central carbon atom. This symmetry is maintained regardless of the orientation of the molecule.
Additionally, methane possesses rotational symmetry. It can be rotated around any of the carbon-hydrogen bonds, and the molecule will retain its overall appearance.
The symmetry of methane arises from its molecular structure and the equal distribution of electron density around the central carbon atom. The four hydrogen atoms are bonded to the carbon through sigma bonds, which have a cylindrical symmetry. This balanced arrangement of the atoms contributes to the overall symmetry of the molecule.
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What is the mass of the precipitate formed when 50mL of 16.9% (w/v) solution of AgNO 3 is mixed with 50mL of 5.8% (w/v) NaCl solution? [Ag=107.8,N=14,O=16,Na=23,Cl=35.5]
The mass of the precipitate formed when 50mL of 16.9% (w/v) solution of AgNO 3 is mixed with 50mL of 5.8% (w/v) NaCl solution is 7.19 g.
Let's calculate the number of moles of NaCl:
Number of moles = Mass(g)/Molecular mass
Number of moles of NaCl = 50×5.8/100/58.5
= 50×5.8/100×58.5
= 0.05 mole
The mass of AgCl can be calculated by referring to Equation 1.
By applying POAC on Ag
Number of moles Ag in AgNO3 = Number of moles Ag in AgCl
Number of moles of AgCl = 0.05mole…(ii)
Molecular mass of AgCl = 143.5………..(iii)
Mass of AgCl = Number of moles × Molecular mass of AgCl ………(iv)
Substitute (ii) and (iii) in (iv)
= 0.05 × 143.5
= 7.16g
The mass of an object is a measure of its inertial properties or the amount of matter it contains. The weight of an object is a measure of the force exerted on it by gravity, or the force required to support it. Mass can best be understood as the amount of matter present in an object or body. Everything around us has mass.
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someone help with this will mark brainliest
Answer:
The main difference between emission and absorption spectra is that an emission spectrum has different coloured lines in the spectrum, whereas an absorption spectrum has dark-coloured lines in the spectrum.l
A 25 ml sample of 1.2 molar potassium chloride mix with 15 ml of 0.90 molar barium nitrate solution and precipitate reaction occurs twice case LX + BA no3s aqueous bacl2 solid + 2ks what is the practical yield percentage yield mass is 2.45 g
A compound is found to contain 9.227 % boron and 90.77 % chlorine by mass. What is the empirical formula for this compound?
Answer:
Empirical formula of a compound means that it provides simplest ratio of whole number.
Explanation:
Mass of boron and chlorine is 9.224% and 90.74%
What is an isotope and how does their abundance in nature differ from element to element
Answer:
isotopes, there elements with a diffrent type atomic weight then the original, usally due to a higher amout of neutrons than the original. Some Isotopes are just as useable as the normal versions, but in some cases, such as Uranium, they can be even more radioactive than the original form
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?
Heat is added to ice at 0 °C. Explain why the temperature of the ice does not change. What does change?When heat is added to ice at 0°C, the temperature of the ice does not change. This happens because all the heat energy is used up in overcoming the intermolecular forces of attraction (hydrogen bonds) that exist between the water molecules in ice.
As a result, the ice undergoes a phase change, from a solid to a liquid. This process is called melting. During melting, the temperature of the ice remains constant at 0°C because all the heat energy is used up in overcoming the intermolecular forces of attraction.The energy required to melt ice is known as the heat of fusion. The heat of fusion is the amount of heat energy required to change 1 kilogram of a solid into a liquid at its melting point. For water, the heat of fusion is 334 kJ/kg. This means that 334 kJ of heat energy is required to melt 1 kg of ice at 0°C. Therefore, during the melting of ice, the temperature of the ice does not change, but the internal energy of the ice does change, and this is manifested in the change of phase from a solid to a liquid.In summary, when heat is added to ice at 0°C, the temperature of the ice does not change, and all the heat energy is used up in overcoming the intermolecular forces of attraction between the water molecules in ice. This results in the melting of ice without any change in temperature.For such more question on molecules
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What is the mass percent of glucose solute of a solution that is composed of 243g of glucose and 4.52 L of water? The density of water is 1.00g/mL.
Answer:
5.11 %
Explanation:
Step 1: Convert the volume of water to millimeters
We will use the relationship 1 L = 1,000 mL.
\(4.52 L \times \frac{1,000mL}{1L} = 4.52 \times 10^{3} mL\)
Step 2: Calculate the mass corresponding to 4.52 × 10³ mL of water
The density of water is 1.00 g/mL.
\(4.52 \times 10^{3} mL \times \frac{1.00g}{mL} = 4.52 \times 10^{3} g\)
Step 3: Calculate the mass of the solution
The mass of the solute (glucose) is 243 g and the mass of the solvent (water) is 4.52 × 10³ g. The mass of the solution is:
m(solution) = m(solute) + m(solvent)
m(solution) = 243 g + 4.52 × 10³ g
m(solution) = 4.76 × 10³ g
Step 4: Calculate the mass percent of glucose in the solution
\(\% Glucose = \frac{mass\ of\ solute}{mass\ of\ solution} \times 100 \% = \frac{243g}{4.76 \times 10^{3}g} \times 100 \% = 5.11 \%\)
What is the difference between 0.50 mol HCl and 0.50 M HCl?
Answer:
Here you go
Explanation:
water can dissolve many substance because
Answer:
polarity
Explanation:
because of its polarity it can dissolve mutiple substance
Help me plsss
What is the mass in grams of H₂ that can be formed from 47.2 grams of NH₃ in the following reaction?
2 NH₃(g) → 3 H₂(g) + N₂(g)
Answer:
8.34
Explanation:
1) how much moles of NH₃ are in the reaction;
2) how much moles of H₂ are in the reaction;
3) the required mass of the H₂.
all the details are in the attachment; the answer is marked with red colour.
Note1: M(NH₃) - molar mass of the NH₃, constant; M(H₂) - the molar mass of the H₂, constant; ν(NH₃) - quantity of NH₃; ν(H₂) - quantity of H₂.
Note2: the suggested solution is not the shortest one.
Name 2 ways heat can be transferred through convention.
Answer:
Heat can travel from one place to another in three ways: Conduction, Convection and Radiation. Both conduction and convection require matter to transfer heat. If there is a temperature difference between two systems heat will always find a way to transfer from the higher to lower system.
Explanation:
which gases are responsible for global warming?
Answer:
Greenhouse gas Chemical formula Global Warming Potential, 100-year time horizon
Carbon Dioxide
Methane
Nitrous Oxide
Chlorofluorocarbon
Explanation:
Calculate the heat change (ΔΗ°rxn) for the slow reaction of zinc with water
Zn(s)+2H2O(l) ---> Zn^2+ (aq) +H2(g)
ΔΗ°rxn = kJ
The heat change or enthalpy change, ΔH°rxn, for the slow reaction of zinc with water is +417.7 kJ/mol.
The heat change or enthalpy change, ΔH°rxn, for the reaction of zinc (Zn) with water (H₂O) can be calculated using the standard enthalpies of formation for each species involved in the reaction.
Balanced chemical equation for the reaction is;
Zn(s) + 2H₂O(l) → Zn²⁺(aq) + H₂(g)
The standard enthalpy change for the reaction, ΔH°rxn, can be calculated as the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants, each multiplied by their respective stoichiometric coefficients;
ΔH°rxn = Σ(nΔH°f, products) - Σ(mΔH°f, reactants)
where n and m are the stoichiometric coefficients of the products and reactants, respectively, and ΔH°f is the standard enthalpy of formation.
Assuming standard conditions (25°C and 1 atm), the standard enthalpies of formation for Zn²⁺(aq) and H₂(g) are typically tabulated values. Let's assume their values to be ΔH°f(Zn²⁺(aq)) = -153.9 kJ/mol and ΔH°f(H₂(g)) = 0 kJ/mol, respectively.
The standard enthalpy of formation of water (H₂O) is -285.8 kJ/mol.
Put the values into the equation, we get;
ΔH°rxn = [ΔH°f(Zn²⁺(aq)) + ΔH°f(H₂(g)] - [ΔH°f(Zn(s)) + 2ΔH°f(H₂O(l))]
ΔH°rxn = [-153.9 + 0] - [0 + 2(-285.8)]
ΔH°rxn = -153.9 + 571.6
ΔH°rxn = 417.7 kJ/mol
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How many moles are contained in 325 gram sample of ammonium dichromate (NH4)2Cr2O7
Answer:
Hyba odpowiedzi c. Hyba
Mole can be defined as the number of molar mass units of the compound in the sample. The moles of ammonium dichromate in 325 grams sample is 1.29 mol.
What is molar mass?The molar mass can be given as the mass of each atom in the formula unit. The molar mass of ammonium chromate is given as:
\(\rm (NH_4)_2Cr_2O_7=2(N)+4\;\times\;2(H)+2(Cr)+7(O)\)
Substituting the mass of each atom to identify the molar mass of ammonium chromate:
\(\rm (NH_4)_2Cr_2O_7=2(14)+4\;\times\;2(1)+2(52)+7(16)\\ (NH_4)_2Cr_2O_7=28+8+104+112\\ (NH_4)_2Cr_2O_7=252 \;g/mol\)
The molar mass of ammonium dichromate s 252 g/mol. The moles of the compound in 325 g is given as:
\(\rm Moles=\dfrac{mass}{molar\;mass} \\\\Moles=\dfrac{325\;g}{252\;g/mol}\\\\ Moles=1.29\;mol\)
The moles of ammonium dichromate in the sample are 1.29 mol. Thus, option c is correct.
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1. in this experiment, why 3-sulfolene was used instead of 1,3-butadiene? explain thoroughly for full credit.
Starting with solid 3-sulfolene and then breaking it down was simpler than doing it with gaseous 1,3-butadiene. Maleic anhydride, a dienophile, reacts with the diene to produce 4-cyclohexene-cis-dicarboxylic anhydride.
What is sulfolene ?A cyclic organic compound with a sulfone functional group is known as sulfolene or butadiene sulfone. It is a crystalline, odorless, white solid that can be stored forever and dissolves in various organic solvents as well as water. The substance is utilized as a butadiene source.
Sulfolane is a common industrial solvent that is used for cleaning natural gas and extracting aromatic hydrocarbons from hydrocarbon mixtures.
Sulfolane, a dipolar aprotic sulfone solvent, is comparable in physicochemical qualities to other dipolar aprotic solvents as DMSO, NMP, DMF, and DMAC. Sulfolane (anhydrous) has the highest freezing point and highest boiling point among the solvents in Table 1 at 28.4 °C.
Thus, solid 3-sulfolene and then breaking it down was simpler than doing it with gaseous 1,3-butadiene.
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Match each tern with its definition by writing the letter of the correct definition on
the line beside tite term.
Answer:
3. d
4. c
5. i
6. h
7. a
8. g
9. j
10. b
11. e
12. f
Explanation:
Suppose that scientists have discovered three new elements. All three elements are in the same group on the periodic table. The other known properties of the elements are given in the table.
Element symbol Atomic mass Physical state Boiling point
Xo 47 amu gas 215∘C
A 27 amu gas 350∘C
Zw 98 amu liquid 285∘C
The best order for the elements within the group, starting from the top and working down is ______ (Choices: Xo, Zw, A / A, Xo, Zw / Xo, A, Zw) because of the trend in the _______________. (Choices: Alphabetical order, boiling point, or atomic masses)
Due to the trend of boiling points, the optimal order for elements within a group going from top to bottom is \(A, X_o, Z_w\).
From the given information we can see that the boiling points of the elements decrease from A to Xo to Zw. The highest boiling point (350°C) is of element A, followed by Xo (215°C) and Zw (285°C). We arrange the components in decreasing order of boiling points to get A, Xo and Zw.
It is important to remember that in this situation, the alphabetical order of the elements and their atomic weights are irrelevant considerations. A reasonable basis for arranging the components within the system is provided by the trend in boiling points.
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for each of the salts on the left, match the salts on the right that can be compared directly, using ksp values, to estimate solubilities. (if more than one salt on the right can be directly compared, include all the relevant salts by writing your answer as a string of characters without punctuation, e.g, abc.)
Ksp values can be compared to determine the relative MOLAR solubility of salts (saturated solution). There are hence more ions in solution the higher the Ksp.
Can Ksp values be derived from solubilities that have been measured?Salts that produce the same number of ions in solution can have their respective solubilities predicted using Ksp values. For instance, the solutions of silver chloride, silver bromide, and silver iodide all contain two ions.
In what way do Ksp levels affect solubility?A solid's equilibrium with its component ions in a solution is described by the solubility product constant (Ksp). The compound's ability to dissociate in water is determined by the constant's value. The more Ksp a substance has, the more soluble it is.
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Observations:
Sodium hydroxide reacts with coper sulfate
Answer:
copper sulphate reacts with sodium hrydroxide to form a blue preipitate of copper hrydroxide and soduim hrydroxide.