The dissociation constant of Ka is 7.83 × 10³ .
What does molar mass mean?In chemistry, the molar mass of a chemical compound is determined by dividing its mass by the quantity of the material, or the number of moles in the sample, expressed in moles. A substance's molar mass is a bulk attribute, not a molecular one. Mass per mole is one way to define molar mass. Molar mass is, in other words, the total mass of all the atoms in a substance that makes up a mole. It is quantified in grams per mole.
Molar mass is shown for substances or molecules. The molar mass of a single element or atom would simply be that element's mass represented in atomic mass units.
Mass of HN[tex]O_{2}[/tex] = 1.93g
Volume of solution = 500 ml
[tex]H^{+}[/tex] equilibrium = 7.63 × [tex]10^{3}[/tex] m
Molarity of HN[tex]O_{2}[/tex] = mol [tex]HNO_{2}[/tex] /vol in2
mol [tex]HNO_{2}[/tex]
= mass(g) / molar mass
= 1.93/42.0129 g/mol
= 0.04105
Hence ,
molarity of HNO2
= 0.04105/0.5L
= 0.0821 M
Reaction
HNO2 ⇄ H+ NO2
x = [tex]H^{+[/tex] = 7.63 × [tex]10^{3}[/tex] M
= 0.0821 - 7.63 [tex]10^{3}[/tex]
= 0.0821 - 0.00763
= 0.0745 m
[tex]H^{+}[/tex] = 7.63 × [tex]10^{3}[/tex]
[tex]NO_{2}[/tex] = x = 7.63 × [tex]10^{}[/tex]³
Dissociation of constant ka
ka = [tex]H ^{+} NO_{2} ^{-}[/tex]/ HNO²
=[tex]10^{3}[/tex] × 7.83
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Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O.
The empirical formula of the caffeic acid is C₂H₂O.
What is mass composition of each element?The mass composition of the carbon and hydrogen in the carbon dioxide and water respectively is calculated as follows;
mass of carbon dioxide CO₂ = 44 g/molmass of water H₂O = 18 g/molatomic mass of carbon = 12 g/molatomic mass of hydrogen gas = 2 g/moltotal mass of the caffeic acid = 1 x 10² mg = 0.1 gmass of carbon in 220 mg of CO₂ = (12 x 0.22 g)/(44) = 0.06 g
mass of hydrogen in 40.3 mg of H₂O = (2 x 0.0403 g) / (18) = 0.0045 g
mass of oxygen = 0.1 g - (0.06 g + 0.0045 g) = 0.0355 g
The molar composition of the elements is calculated as follows;
H = 0.0045 /1 = 0.0045
C = 0.06 / 12 = 0.005
O = 0.0355 / 16 = 0.0022
Divide through with the smallest molar composition
H = 0.0045 / 0.0022 = 2
C = 0.005/0.0022 = 2
O = 0.0022/0.0022 = 1
The empirical formula is C₂H₂O
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The complete question is below:
Combustion of 1.00 × 102 mg of caffeic acid yields 220 mg of CO2 and 40.3 mg of H2O. find the empirical formula of the caffeic acid.
Asteroids are left over pieces of rocks that didn't become planets or satellites. Where are most of these located in the Solar System?
A. The Oort Cloud
B. The Kuiper Belt
C. The Asteroid Belt
Asteroids are left over pieces of rocks that didn't become planets or satellites. These are mostly located in The Asteroid Belt in the Solar System.
The main asteroid belt is a region between the orbits of Mars and Jupiter. The Asteroid Belt is a torus shaped region. Some of the asteroids may go in the front or behind the Jupiter.
The Oort cloud has around 2.3% of left over pieces of asteroid rocks. It is a predicted percentage.The asteroids were located in more amount earlier when the interplanetary zones were clearing in the solar system.
The Kuiper Belt has bits of rocks, comets, ice, and the dwarf planets. It is similar to the asteroid belt but it is more complex and larger.
Asteroids are discovered by a systematic search for a planet between Mars and Jupiter in the asteroid belt.
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0.5 pts This is a reaction that you can find the two half reactions for on a REDOX tower in your discussion manual: NAD+ +H2 --> NADH + 2H+
Group of answer choices
Which compound is the electron donor?
Which compound is the electron acceptor?
When the electron donor loses the electron it becomes:
When the electron acceptor accepts the electron it becomes:
Overall the electron travels from:
The electron donor is [tex]H_2[/tex].
The electron acceptor is [tex]NAD^+[/tex]
When the electron donor loses the electron, it becomes oxidized.
When the electron acceptor accepts the electron, it becomes reduced.
Overall, the electron travels from H to [tex]NAD^+[/tex].
Oxidation and reductionOxidation is defined as:
Loss of electronsIncrease in oxidation numberLoss of hydrogenGain of oxygenReduction is defined as:
Gain of electronsDecrease in oxidation numberGain of hydrogenLoss of oxygenLooking at the reaction, [tex]NAD^+[/tex] gained hydrogen or an electron to become NADH. this means that NADH has been reduced. The reducing agent or the electron donor is [tex]H_2[/tex] .
Thus, the electron acceptor is [tex]NAD^+[/tex]. When the electron donor, [tex]H_2[/tex], loses the electron, it becomes oxidized to [tex]H^+[/tex].
When the electron acceptor, [tex]NAD^+[/tex], accepts the electron, it becomes NADH.
This means that electron travels from [tex]H_2[/tex] to [tex]NAD^+[/tex]
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Once started, why can nuclear fission continue to occur on its own? The thermal energy released can cause the products to join. The neutron formed by the reaction can cause more nuclei to combine. The thermal energy released can cause the products to split. A neutron begins the reaction, and more neutrons are formed in it.
Once started, nuclear fission reactions are able to continue to occur on their own because a neutron begins the reaction, and more neutrons are formed in it; option D
What is nuclear fission?Nuclear fission is a type of nuclear reaction in which the nucleus of atoms of large molecular mass is split into two or more smaller atomic nuclei.
Nuclear fission reactions result in the release of large amounts of heat energy and radiation.
Nuclear fission reactions once started, are able to go on occurring on their own until all fissionable material is used up. This is known as a chain reaction.
A chain reaction in nuclear fission occurs because when the atomic nucleus of the large atom is bombarded with fast-moving neutrons, the neutrons that are captured by the nucleus of the large atom results in the fission of the atom and the release of more neutrons that initiate more fission reactions.
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If You Had Three Wishes, What Would You Wish For
Assuming you can't wish for infinite wishes:
1. Hyperintelligence
2. Elite athleticism (within the confines of human limitations of course. So just being a 99th percentile athlete)
3. The ability to summon a delicious steak of any variety at any level of doneness at any moments notice
look at the picture
Each isotopes has a different atomic mass , and each occurs in nature in different abundance this statement is true.
What are Isotopes?Isotopes can be defined as varieties of chemical elements that have the same number of protons and electrons but different numbers of neutrons. In other words, isotopes are varieties of elements that differ in their number of nucleons (the total number of protons and neutrons) due to the difference in the total number of neutrons in their nuclei. The total number of neutrons in the nucleus of an isotope can be determined by subtracting the atomic number of the element from the mass number of the isotope.
For example, the mass number of the isotope 12C of carbon is 12. The atomic number of carbon is 6. Therefore, the isotope carbon-12 has a total number of neutrons of 6.
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What are the first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate.
Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s) is the first and Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq) is the second net ionic equations for the addition of aqueous ammonia to aluminum nitrate
The net ionic equation is the chemical equation that shows only those elements or compounds or ions that are directly involved in the chemical reaction
So, first and second net ionic equations for the addition of aqueous ammonia to aluminum nitrate are
Complete ionic equation is
Al₃(aq) + 3NO₃(aq) + 3NH₄⁻(aq) + 3OH⁻(aq) → Al(OH)₃ (s) + 3NH₄⁺(aq)+ NO₃⁻(aq)
So two net ionic equations are
Al₃⁺(aq) + 3OH⁻(aq) → Al(OH)₃(s)
Al³⁺(aq) + 3NH₄OH → Al(OH)₃(s) +3NH₄⁻(aq)
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When 0.442g of sodium metal is added to an excess of HCl acid, 4590J of heat are produced. What is the enthalpy of the reaction as written:
2Na(s) + 2HCl (aq) yields 2NaCl + H2(g)
What is enthalpy of reaction in KJ.
I tried to work this out but am not sure if I need to multiply my answer by two because of the 2 moles of Na or if that is accounted for already in the grams of sample.
My work as far:
chemical reaction is exothermic, so delta H wil be negative
Q=number of moles x delta H
There are 2 moles of Na in equation producing 2 mol NaCl
Na is 22.989769 g/mol so 0.4429 sample has .4429/22.989769 = 0.019 mol
Delta H is Q/number of moles
-4590J/.019mol = -241,578.9J divided by 1000 is -241.579KJ. (enthalpy)
So I wonder if I need to multiply this by 2 since the chemical equation has two moles
if so, the answer would be -483.158KJ.
IF I'm not using the correct formula to solve, I also need to know that.
The enthalpy of the reaction is obtained as 242 kJ/mol
What is the enthalpy?We define the term enthalpy as the heat that is evolved or absorbed in a chemical process. In this case, heat is evolved when the reaction occurs because a neutralization reaction is necessarily an exothermic reaction. This is because het is given off.
We have been supplied with the amount of that is produced in the process. Hence we have;
Number of moles of sodium metal = 0.442g /23 g/mol = 0.019 moles
Thus, we have the enthalpy as;
H = 4590 * 10^-3 kJ/0.019 moles
= 242 kJ/mol
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At a certain temperature, this reaction establishes an equilibrium with the given equilibrium constant, Kc. 3A(g)+2B(g)↽−−⇀4C(g)c=1.33×1031 3 A ( g ) + 2 B ( g ) ↽ − − ⇀ 4 C ( g ) K c = 1.33 × 10 31 If, at this temperature, 1.80 mol of A and 3.50 mol of B are placed in a 1.00 L container, what are the concentrations of A, B, and C at equilibrium?
The equilibrium concentrations of A, B, and C at equilibrium are:
the concentration of A = 0.12 Mthe concentration of B = 2.38 Mthe concentration of C = 2.24 MWhat are the equilibrium concentrations of A, B, and C?The equilibrium concentrations of A, B, and C are calculated from the equilibrium equation below as follows:
Kc = [C]⁴ / [A]³ * [B]² -----(1)
Kc = 1.33 * 10
The initial concentrations of A and B are as follows:
A = 1.80 mol / 1 L = 1.8 M
B = 3.50 mol / 1 L = 3.50 M
The concentrations at equilibrium are given by the ICE table below:
3 A (g) + 2 B (g) ⇄ 4 C (g)
I 1.80 3.50 0
C - 3x - 2x + 4x
E 1.80 - 3x 3.50 - 2x 4x
Substituting the concentrations at equilibrium into the equilibrium equation above
1.33 * 10³¹ = 4x⁴ / (1.80 - 3x)³ * (3.50 - 2x)²
x = 0.56
Therefore;
the concentration of A = 1.80 - 3 * 0.56
the concentration of A = 0.12 M
the concentration of B = 3.50 - 2 * 0.56
the concentration of B = 2.38 M
the concentration of C = 4 × 0.56
the concentration of C = 2.24 M
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The number of moles of MgO produced when 0.20 mole of O2 reacts completely is
The number of moles of MgO produced when 0.20 mole of O₂ reacts completely is 0.40 mole
Mole is the SI unit of amount of substance of a specified elementary entity
Here given data is number of moles of MgO produced when 0.20 mole of O₂ reacts we have to find mole = ?
So the balanced equation is
2Mg + O₂ → 2MgO
So, the number of moles of MgO = (0.20 mol of O₂ )×(2 mol of MgO) / (1 mol of O₂)
= 0.40 mole
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12.60 mg KI in 109.9 mL of solution
Answer: Molarity (M) = 6.897 x 10-4 (exponent)
Explanation: Atomic weight of KI is 166.028
12.6 mg = 0.126g/ 166.028 = 7.58 x 10-5 mol
Molarity (M) = concentration
M = moles(n)/Volume (in liters)
M= 7.58 x 10-5 mol/0.1099L = .0006897 M = 6.897 x 10-4 (exponent)
HELP NEEDED ASAP!!!! Which of the following statements about the filament sliding model is FALSE?
A. Actin subunits form the dark A band.
B. The thick filament has an head with an ATP-binding site.
C. The tick filament, or the M-line pulls the thin filament to contract a muscle
D. Actin and myosin are both motor proteins.
Considering the given statements about the filament sliding model in muscles, the statement that is false is;
Actin subunits form the dark A band; option AWhat are muscle filaments?Muscle filaments or myofilaments are the three protein filaments that make up the myofibrils in muscle cells.
There are three main proteins filaments that make up the myofibrils, and they are:
myosin - this is a contractile protein that makes up the dark A band in muscle fibersactin - this a contractile protein that makes up the light band in muscle fibertitin- this is an elastic proteinLearn more about muscle filaments at: https://brainly.com/question/1370027
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What is the formula for Ag ^+ and Na2S
The formula for Ag ^+ and Na2S is,
Net Ionic Equation
2Ag + Na2S = Ag2S + 2Na might be an ionic equation.
What exactly is a net ionic equation?The formula for Ag ^+ and Na2S is example of Net Ionic Equation. A net ionic equation is defined as an equation that depicts only the molecules or ions that are actively involved in the reaction or those that change. The spectator ions are not present in this equation. First, write and balance the molecular equation, ensuring that all formulas are correct. Then, using all aqueous substances as ions, write the ionic equation. Carry any coefficients through. Finally, remove spectator ions from the equation and write the net ionic equation. The objective of writing a chemical equation exists to communicate what we accept is proceeding in a chemical reaction. One of the most useful applications of the principal species concept is in the formulation of net ionic equations.To learn more about Net Ionic Equation, refer to:
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emmissions generated by a coal powered utility
Answer:
Explanation:
Coal is a cheap and abundant resource, and carbon dioxide (CO2) from coal use is responsible for about 40 percent of global greenhouse gas (GHG) emissions from fossil fuel use.
What is the molality of an aqueous solution made with 5.00 kg of water and 3.6 mol of solute?
0.72 m NaOH
3.6 m NaOH
0.090 m NaOH
1.4 m NaOH
The molarity of the aqueous solution is determined as 0.72 M NaOH.
What is molarity?
Molarity is used to express the concentration of a solution. It is described as the number of moles of a solute in a given concentration of a solution.
Mathematically, molarity is given as;
M = n/V
where;
n is the number of moles of the soluteM is the concentration of the solutionV is the volume of the solutionThe volume of the water is calculated as follows;
volume = mass / density
volume = (5 kg) / (1000 kg/m³)
volume = 0.005 m³
The volume of the water in liters is calculated as follows;
volume = 0.005 m³ = 5 liters
The given parameters;
number of moles of the solute = 3.6 moles
Molarity = 3.6 moles / 5 L
molarity = 0.72 M
Thus, the molarity of the aqueous solution of sodium hydroxide is determined from the ratio of number of moles to the volume of the solution.
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Use this reaction to answer the questions and explain :
CO(g)+2H2(g)-CH3OH(g) DeltaH= -91.8kJ
1- if the temperature of the system increases , will the value of the equilibrium constant k increase, decrease or stay the same?
2- Will the concentration of H2 increase, decrease or stay the same ?
1) If the temperature of the system increases, the equilibrium constant k decreases.
2) the concentration of H₂ increases.
The reaction is given as :
CO + 2H₂ ⇄ CH₃OH ΔH = -91.8 KJ ( exothermic reaction)
1) Temperature is the only factor that changes the equilibrium constant for the given reaction. As temperature increases equilibrium constant decreases because the reaction is exothermic reaction.
K = [ CH₃OH ] / [CO] [H₂]²
2) If the temperature increases the position of equilibrium moves to the left and concentration of H₂ increases.
Thus, 1) If the temperature of the system increases, the equilibrium constant k decreases.
2) the concentration of H₂ increases.
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An atom of Lithium has three protons. It is neutral so it has no electrical charge.
Which statement is true using ONLY this information?
A There is a charge of +3 on an atom of lithium.
B There are three neutrons in the nucleus.
C There are three electrons
D There is charge -3 on an atom of lithium.
In the nucleus, proton and neutron are present. Electron has -1 charge while proton has +1 charge. Neutron is neutral that is it has no charge. The correct option is option C
What is atom?Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided.
As it is given that lithium atom is neutral for this number of proton has to be equal to number of electron. The proton number is 3 that means number of electron is also 3 because proton number is equal to number of electron and this equals to atomic number.
Therefore there are three electrons in Lithium if it has three proton. The correct option is option C
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The following chemical reaction takes place in aqueous solution:
FeCl₂(aq)+K₂S(aq) → FeS(s)+2 KCl(aq)
Write the net ionic equation for this reaction.
Answer: Fe(aq) + S(aq) yields FeS(s)
Explanation:
Fe+2 + 2Cl- + 2K+ + S-2 yields FeS(S) + 2K+ + 2Cl-
Cross out the aqueous ions and you are left with
Fe+2 + S-2 yields FeS(s).
hello, can someone please help me with this problem
This reaction is exothermic reaction and amount of heat that was released or absorbed by the reaction is 208.8kJ and reaction enthalpy means ΔH is 705.91kJ/mol
An exothermic process releases heat causing the temperature of the immediate surroundings to rise
Here given reaction is
KOH → K⁺ + OH⁻
So, here given data is 14.4 gram of potassium hydroxide in 250 gram of water and the temperature of water rise from 20°C to 34.5°C and
We have to find which type of reaction is this =? and
Calculate heat released or absorbed by this reaction =? and
Calculate reaction of enthalpy ΔH = ?
So this reaction is exothermic because when potassium react with water it gives potassium hydroxide and in that potassium hydroxide the potassium is positive charge and OH has negative charge
Amount of heat released or absorbed by the reaction the formula are
q = m×c×ΔT and ΔT = 20°C - 34.5°C = 14.5°C and c = 0.452J/g°C
q = 14.4 gram×0.452×14.5°C
q = 94.377kJ
Reaction enthalpy means ΔH so,
ΔHreaction = m×s×ΔT
ΔHreaction = 14.4 gram×94.377kJ×14.5°C
ΔHreaction = 705.91kJ/mol
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In a reaction of 3-ethyl-2-pentene with HBr as an electrophilic addition reaction, predict the major and minor products (if there is a
difference). Justify your answer by providing the carbocation intermediates for all products. You may arbitrarily choose which
product is product #1 and which is product #2. You will determine major and minor (if any) in the questions below the box.
Intermediates
Products after reacting with HBr
().
Structure of Starting Reactant:
3-ethyl-2-pentene
(you may choose the stereo configuration)
Intermediate option #1
Intermediate option #2
Product from Intermediate #1
Product from Intermediate #2
tu me puedes ayudar con mi tarea
What volume (in mL) of 0.2950 M HCI is required to neutralize 75.00
mL of 0.6000 M LIOH?
203 mL of 0.2950 M HCI is required to neutralize 75.00 mL of 0.6000 mL NaOH.
Hcl + NaOH [tex]\rightarrow[/tex] Nacl + H2O
Form dilution formula:
M1V1=M2V2.
So M1=0.6000M, V1=0.075L, M2=0.2950M HCl, V2=?
V2 = M1V1/M2
= (0.8)(0.075)/0.2950
=0.2033L=203 mL.
Explain Dilution ?Dilution is the process of "lowering the concentration of a solute in a solution simply by adding more solvent, such as water, to the solution." Diluting a solution requires adding a solvent without adding a solute.
A popular way to make a solution of a given concentration is to take a higher concentration and add water until the required concentration is reached. Dilution is the term for this procedure. Dilution can also be done by mixing a higher concentration solution with a lower concentration. Since stock solutions are often obtained and stored in very concentrated concentrations, dilution of the solutions is a mandatory procedure in the laboratory.
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In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a
reaction. The opposite process is a
reaction.
In certain fireworks, potassium nitrate breaks down into potassium oxide, nitrogen, and oxygen. This is an example of a combustion reaction. The opposite process is a synthesis reaction
fireworks are a class of low explosive devices used for aesthetic and entertainment purposes
Here potassium nitrate is break down into the potassium oxide and nitrogen and oxygen which decomposes is by given burning it is also combustion reaction and the synthesis reaction is opposite to this reaction
2KNO₃ → 2KNO₂ + O₂
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Write a balanced chemical equation for each of the following neutralization reactions.
HNO3 + Al(OH)3
The balanced chemical equation for the neutralization reaction is Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O.
What is the balanced chemical equation neutralization reaction?A balanced chemical reaction is defined as the equation in which the number of atoms in each reaction remains the same on both sides like on the product side and the reactant side. In a balanced chemical equation, the mass, as well as the change, remains the same in a balanced chemical equation.
A neutralization reaction is a reaction in which the acid reacts quantitatively with a base to form salt and as well as water is known as neutralization reaction. In a neutralization reaction, there is a combination of H+ ions and OH– ions that form water.
The balanced chemical equation for the given value of the neutralization reaction is given below.
Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O, the equation is balanced.
So we can conclude that Al(OH)₃ + 3HNO₃ ----> Al(NO₃)₃ + 3H₂O is the balanced reaction.
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Donna wants to calculate the speed at which a sound wave is traveling. She knows that the frequency of the wave is 680 hertz and that the wave has a wavelength of 0.5 meters.
What is the speed of the sound wave?
The speed of the sound wave is 340 mrter per second.
f = frequency of sound wave = 680 hertz
λ = wavelength of sound wave = 0.5 meter
v = speed of the sound wave
We know that the velocity of a sound wave is given by
speed of sound wave = frequency wave of sound x wavelength of sound wave
v = f λ
Substituting the above values into the above equation
v = (680 hertz) (0.5 meters)
v = 340 meters per second
Therefore the speed of sound waves is 340 meters per second.
Sound waves are pressure waves. They can be seen as pressure fluctuations over time. Sound waves are transverse waves. To hear the sound of a tuning fork, the tines on the fork must move air from the fork to the ear. Most sound waves are produced by vibrating objects. Sound is a kind of energy produced by vibration.
These vibrations create sound waves that travel through media such as air water, and wood. When an object vibrates it creates motion in the particles of the medium.
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look at the picture
high school
Answer:
determining the melting point of a substance
Explanation:
Help me PLEEEEEAAASSEE ASAP I BEG YOU IF YOU KNOW THE ANSWER Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Neither methane nor nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only methane is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Only nitrous oxide is a more effective greenhouse gas than carbon dioxide.
Answer:
Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide.
Explanation:
Not really sure what the problem is, the answer is given in the question.
The question asks "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide. Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."
The first part of the question is "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
The second part of the question is literally the answer, "Both methane and nitrous oxide are more effective greenhouse gases than carbon dioxide."
it could be that you just accidentally pasted the same thing twice, and the original question was just "Which compares the effectiveness of methane and nitrous oxide as a greenhouse gas with that of carbon dioxide."
In that case, remember that the order of greenhouse gas potency is Carbon dioxide, methane, nitrous oxides, chlorofluorocarbons. Thus, nitrous oxide and methane are both more potent than carbon dioxide.
Is distilled water act as preservative?
Water is exposed to electromagnetic radiation of wavelength 3.80 x 10-8 m. Assume that all the radiation is absorbed and converted to heat. How many photons are required to raise the temperature of 4.48 g of water by 4.65 K?
The number of photons is obtained from the calculation as 1.68 * 10^19 photons.
What is energy?
By definition, we know that energy is the ability to do work. Now we know that we have the wavelength of the radiation can be seen from the question and the values that are given to be 3.80 x 10-8 m.
Then energy = hc/λ
h = Plank's constant
c = speed of light
λ = wavelength
E = 6.6 * 10^-34 * 3 * 10^8/ 3.80 x 10^-8
E = 5.2 * 10^-18 J
Energy of the water = mcdT
= 4.48 * 4.2 * 4.65 = 87.5 J
Number of photons required = 87.5 J/5.2 * 10^-18 J
= 1.68 * 10^19 photons
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An organic compound contains 24.24%carbon,4.04% hydrogen,and 71.72%chlorine what is its empirical formula if the molecular mass of the coumpound is 148.5 determine its molecular formula
The empirical formula of an organic compound with 24.24% carbon. 4.04% hydrogen, and 71.71% chlorine will be [tex]CHCl_2[/tex].
If the molar mass of the compound is 148.5, the molecular formula will be [tex]C_2H_2Cl_4[/tex].
Empirical and Molecular FormulasThe compound contains:
C = 24.24H = 4.04Cl = 71.71The mole of each atom can be found by dividing them by their respective molecular weights.
C = 24.24/12 = 2.02H = 4.04/1 = 4.04Cl = 71.71/35.5 = 2.02Now, let's divide through by the smallest number of moles
C = 1H= 2Cl = 1Thus, the empirical formula of the compound is [tex]CHCl_2[/tex].
The molar mass of the empirical formula is calculated as:
12 + 1 + (35.5 x2) = 84 g/mol
Molecular formula = [empirical formula]n
Where n = Molecular formula mass/empirical formula mass
In this case, n = 148.5/84
= 1.77 (approximatel 2)
Thus, the molecular formula of the compound is [tex]C_2H_2Cl_4[/tex].
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Draw the net force arrow on the diagram and state the direction. Net force direction
The Net force which is acting on the object is 20.12 N and the direction (θ) of the net force is 26.56° towards the South of East. The net force is a resultant of both the forces.
What is the net force?Th net force is the vector sum of all the forces which are acting on a particle or object. The force on the object in the diagram is given below as follows:
Force 1, F₁ = 18 N (force acting in a direction to the east)
Force 2, F₂ = 9 N (force acting in a direction south)
The two forces makes the two sides of a right-angled triangle in the diagram:
Net force can be determined using Pythagoras rule as follows:
Net force, F = √[(F₁)² + (F₂)²]
Net force = √ [(18)² + (9)²]
Net force = √ (324 + 81)
Net force = √ 405
Net force = 20.12 N
The direction of the Net force (θ) is determined as follows:
θ = tan⁻¹ (9 / 18)
θ = tan⁻¹ (0.5)
θ = 26.56° towards South of East
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