Solution :
From Fick's law:
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=N_a$[/tex]
Mass balance: Exits = Accumulation
[tex]-N_A A = \frac{dm}{dt}[/tex]
[tex]-N_A A = \frac{dVp}{dt}[/tex]
[tex]-N_A A = \frac{dV}{dt}p[/tex]
[tex]-N_A A = \frac{dhA}{dt}[/tex]
[tex]-N_A A = \frac{dh}{dt} \times Ap[/tex]
From the last step, area cancels out and thus leaves :
[tex]-N_A = \frac{dh}{dt} \times p[/tex]
So now we can substitute the [tex]$N_A$[/tex] by the Fick's law
[tex]$\frac{D_{AB}}{\Delta z } \times (C_{A1}-C_{A2})=\frac{dh}{dt} p$[/tex]
Substituting the values we get
[tex]$=\frac{-4 \times 10^{-13}}{0.0001} \times (3 \times 10^{26} - C_{A2}) = \frac{dh}{dt} \times 2.46$[/tex]
[tex]$=-4 \times 10^{-9} \times( 3 \times 10^{26} - C_{A2}) = 0.0001 \times 2.46$[/tex]
[tex]$= -7800 \times 4 \times 10^{-9} \times (3 \times 10^{26}-C_{A2})=0.000246$[/tex][tex]$=-(3 \times 10^{26}-C_{A2}) = 7.8846 \times 100 \times \frac{1}{69.62} \times 6.022 \times 10^{23}$[/tex]
[tex]$C_{A2} = 6.85 \times 10^{28} \ \text{ boron atoms} /m^3$[/tex]
Please show work!
Question below::
What is the free energy change if the ratio of the concentrations of the products to the concentrations of the reactants is 22.3, and the temperature is 37.0 °C? ?G°\' for the reaction is –16.7 kJ/mol.
The free energy change(Gibbs free energy-ΔG)=-8.698 kJ/mol
Further explanationGiven
Ratio of the concentrations of the products to the concentrations of the reactants is 22.3
Temperature = 37 C = 310 K
ΔG°=-16.7 kJ/mol
Required
the free energy change
Solution
Ratio of the concentration : equilbrium constant = K = 22.3
We can use Gibbs free energy :
ΔG = ΔG°+ RT ln K
R=8.314 .10⁻³ kJ/mol K
[tex]\tt \Delta G=-16.7~kJ/mol+8.314.10^{-3}\times 310\times ln~22.3\\\\\Delta G=-8.698~kJ/mol[/tex]
A 283.3-g sample of X2(g) has a volume of 30 L at 3.2 atm and 27 'C. What is element X?
we find the number of moles with the formula
pV=nRT
27C=300k
3.2*30=n*0.082*300
n=96/24.6=3.9 moles
we have the mass ant the number of moles so we can calculate the molar mass
283.3/3.9=72.64g/moles
that means X's mass is 72.64/2=36.3 so the element is Kr(Kriptonium)
In Space, an astronaut releases a wrench from his hand. The wrench has a mass of 4 grams and is traveling with a velocity of -15m/s. The Astronaut’s mass is 70kg. What is his Velocity?
Answer:
860 cm/s
Explanation:
Let P = momentum of wrench-man system before throwing the wrench and P' = momentum of wrench-man system before throwing the wrench.
From the law of conservation of momentum,
P = P'
P = 0 (since both Astronaut and wrench were initially stationary) and P' = m₁v₁ + m₂v₂ where m₁ = mass of wrench = 4g = 0.004 kg v₁ = velocity of wrench after releasing the wrench = -15 m/s m₂ = mass of Astronaut = 70 kg and v₂ = velocity of Astronaut after releasing the wrench.
So, P = P'
0 = m₁v₁ + m₂v₂
-m₁v₁ = m₂v₂
dividing both sides by m₂, we have
v₂ = -m₁v₁/m₂
substituting in the values of the variables, we have
v₂ = -0.004 kg × (-15 m/s)/70 kg
= 0.06 kgm/s ÷ 70 kg
= 8.6 × 10⁻⁴ m/s
= 860 × 10⁻² m/s
= 860 cm/s
can someone answer that for me
Answer:
4^4, or 256
Explanation:
When dividing numbers with exponents and the same base, you will subtract from the exponents and keep the base the same.
True or False: Radon is a solid at – 100 °C.
What is the molarity of 2.0 moles of glucose
in 4.0 L of glucose solution?
Answer:
0.5 M
General Formulas and Concepts:
Chemistry - Aqueous Solutions
Molarity = moles of solute / liters of solutionExplanation:
Step 1: Define
2.0 mol glucose
4.0 L glucose solution
Step 2: Find Molarity
Substitute: M = 2.0 mol / 4.0 LDivide: M = 1/2Evaluate: M = 0.5molecular formula of alkyne containing 10 carbon atom
Answer:
Decyne: C10H18
Hope it helps! please mark me brainliest..
Merry Christmas good day
The general formula for alkynes is CnH2n-2
the number of carbon atoms is 10 so the number of hydrogen atoms will be 10*2-2=20-2=18hydrogen atoms
the molecular formula for this alkyne is :
C₁₀H₁₈ which is called decyne
What is the standard reduction potential,E, for the half-reaction Zn2+(aq)+2e- -> Zn(s)?
Answer:
E = -0.76 V
Explanation:
The potential between the anode and the cathode is called standard reduction potential. It gives the tendency of the species to get reduced.
The given half reaction is :
[tex]Zn^{2+}(aq)+2e^{-}\rightarrow Zn(s)[/tex]
Zn²⁺ is the reduced form of Zn.
It is a stronger reducng agent.
Its standard reduction potential (E) has a sandard value.
E = -0.76 V
Hence, the correct option is (c).
How many valence electrons does selenium have?
Answer:
six electrons
Explanation:
The six electrons in the outermost shell allow selenium to have a variety of valence numbers. Selenium compounds have been found that have valences of -2, 4, and 6. Speaking of the number six, selenium is found to have six naturally occurring isotopes.
If I have 80 grams of H2 how many molecules of H2 do I have?
Answer:
2 molecules
Explanation:
I don't know how to explain it
The chemical formula of water is H₂O. Then 1 mole of water weighs 18 gram. Hence, 80 gram of water is equal to 4.4 mole.
What is chemical formula ?
Chemical element symbols, numbers, and occasionally other symbols like parentheses, dashes, brackets, commas, and plus and minus signs are used in a chemical formula to represent information about the chemical proportions of the atoms that make up a certain chemical compound or molecule.
It displays the constituent elements and how many atoms of each element are found in a single complex molecule. It also represents the compound's molecular weight.
Water has the chemical formula H₂O. Water weights 18 grams per mole. 80 grams of water are therefore equivalent to 4.4 moles.
Thus, The chemical formula of water is H₂O. 80 grams of H₂ contain 4.4 molecules of water.
To learn more about chemical formula, follow the link;
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what is the meaning of the word hydrocarbons
Answer:
An organic compound (such as acetylene or butane) containing only carbon and hydrogen and often occurring in petroleum, natural gas, coal, and bitumens.
Explanation:
Iooked it up
How are Parkinson's disease and ALS similar?
Both diseases are preventable.
Dementia is a symptom of both diseases.
Both diseases affect control of voluntary muscles.
Scientists understand the causes for both diseases.
HELP PLZ
Answer:
Both diseases affect the control of voluntary muscles.
Explanation:
Parkinson's disease is a progressive brain disease that affects movement. It affects the nerve cells that produce dopamine in the part of the brain called substantia nigra. The symptoms include shaking, stiffness, and difficulty with walking, balance, and coordination. Symptoms get worse with time, often leaving people with difficulty walking and talking.
ALS (amyotrophic lateral sclerosis) is a progressive nervous system disease that affects nerve cells in the brain and spinal cord. The first symptoms usually involve muscle weakness, and as the disease progresses, it results in the loss of muscle control.
Scientists don't know the exact cause of these diseases. As the cause is not known, there is no exact way to prevent them. There is no cure for them, either. The treatment is focused on the management of symptoms.
This is why the third option is the correct one.
What is the volume of a sample that has a mass of 20 grams and density of 4 g/mL?
Answer:
5 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question we have
[tex]volume = \frac{20}{4} \\ [/tex]
We have the final answer as
5 mLHope this helps you
A subrule of the Cahn-Ingold-Prelog system specifies that higher mass number takes precedence over lower when distinguishing between isotopes. Determine the absolute configurations of the reactant and product in the biological oxidation of isotopically labeled ethane.
Answer:
The correct answer is - S- configuration.
Explanation:
Placing the numbers in order of the priorities of each reactant in the reaction is essential to determining the configuration of the reactant and product in the biological oxidation of isotopically labeled ethane.
CH3 - T- D is the correct order of the increasing of the priorties. so this is moving from CH3 to D which is Anti-clockwise which means the configuartion is S as we know clockwise movement is R configuarion and anti-clockwise in S configuartion.
Fill in the coefficients that will balance the following reaction: (Note: Use 1 as coefficient where appropriate.) NaCl + CaS → Na2S + CaCl2
Answer:
the answer is
2,1,1,1
Explanation:
PLEASE HURRY IM BEING TIMED time: 1:55:40
Which number belongsin the space labeled X?
O5
O7
O8
O 10
Answer:
a.) x = 5
Explanation:
What is electronegativity
Answer:
Electronegativity, symbol χ, measures the tendency of an atom to attract a shared pair of electrons (or electron density). An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.
A. An atom loses one electron. What is the overall charge now?
Answer:
it losses one neutrons that is hydrogen
What is the mass in grams of 12.9 moles of water, H2O?
Answer:
232 g.
Explanation:
12.9 mol x 18.106g = 232 g H₂O
One role of enzymes in the human body
digestion
does that answer it?
Can you please help on 17 and 18 pleaseeee
Answer:
17. Yes, it represents a chemical reaction. This is because new substances were formed from the original substance.
18. (a) Formation of new substances
(b) Evolution or absorption of large quantity of heat
(c)Change in mass of substances
Explanation:
17. In the model above, molecules of a compound of carbon and hydrogen (molecular formula is C2H6) combines with molecular oxygen (O2) to produce two new substances; a compound composed of two oxygen atoms and one carbon atom (CO2) and another compound composed of two atoms of hydrogen and one atom of oxygen (H2O). Since the new substances formed are completely different from the original substances, it a chemical reaction. Also, a large volume of heat would have been given off.
18. To determine if a chemical reaction has occurred, the following observations can be looked out for.
a. Formation of new substances different entirely from the original substances
b. Evolution or absorption of large quantity of heat during the change. Check whether the vessel containing the substances gets hotter or colder.
c. Change in mass of substances. Since new substances are formed in a chemical reaction, there is usually a significant change in mass of the products and reactants.
Human reaction time is usually about 0.18 s. If your lab partner holds a ruler between your finger and thumb and releases it from rest without warning, how far can you expect the ruler to fall before you catch it? (a = -g = -9.81 m/s .) - 0.32 m ⊝ - 0.88 m ⊝ - 0.16 m ⊝ - 0.09 m ⊝ CLEAR ALL ❮ PREVIOUS
Answer:
–0.16 m
Explanation:
From the question given above, the following data were obtained:
Time (t) = 0.18 s
Acceleration due to gravity (g) = –9.81 m/s²
Height (h) =?
We can obtain how far the ruler will fall by using the following equation:
H = ½gt²
H = ½ × –9.81 × 0.18²
H = ½ × –9.81 × 0.0324
H = –0.16 m
Thus, the ruler will fall –0.16 m before you will catch it.
You have two options for this task.
Option 1: Create your own stage or film interpretation of one scene or chapter from Journey to the Center of the Earth, write it out in script or screenplay format, or you can actually film it and upload it to your instructor. You can conduct an Internet search for sample scripts or screenplays to help you with the basics of formatting.
Remember, you are only doing one section. Pick a chapter and go to town!
Option 2: Write an analysis of how the filmmakers of one of the adaptations chose to recreate the movie. Pick a scene — for example, the desperate search for water — and describe and explain how the filmmakers adapted the novel. What parts did they keep? What parts did they change? Why do you think they did that? Do you agree with those decisions? Do you think they made for a better movie? Why or why not?
Write these answers up in a 2 paragraph essay and submit it to your instructor.
Answer:
Option 1
Explanation:
Harry: *wakes up and finds himself at the bottom of a mountain slope and asks, "Where are we?"
Harry: "Are we in Iceland?"
Hans: "Nej."
The Professor: *Gets up and says, "what do you mean? No----What are your reasons?"
Harry: *Rises* "No, Hans is wrong."
After all the innumerable surprises of this journey, a yet more singular one was reserved to us. I expected to see a cone covered by snow, by extensive and widespread glaciers, in the midst of the arid deserts of the extreme northern regions, beneath the full rays of a polar sky, beyond the highest latitudes.
*Time passes while we try to figure out what is happening and where we are. Harry finds that he was saved from death because Hans had saved him.*
You are comparing a reaction that produces a chemical change and one that prouduces a physical change. What evidence could you use to determine wich type of change is occurring?
Answer: If the reaction is a chemical change, new substances with different properties and identities are formed. This may be indicated by the production of an odor, a change in color or energy, or the formation of a solid.
hope it helps!!
Which of the following determines the identity of an element?
write down any four uses of solution
.I will mark him\her as brilliant
Answer:
because it will help u
because it will make u to understand the question very well
Calculate the molarity of a solution of potassium hydroxide if 19.55 mL of KOH is required for the titration of a 20.20 mL sample of a 0.3467 M sulfuric acid solution.
Answer:
The correct answer is 0.3582 M.
Explanation:
Based on the given information, the volume of KOH given is 19.55 ml, the volume of sulfuric acid given is 20.20 ml, and the molarity of sulfuric acid is 0.3467 M. There is a need to find the molarity of KOH.
The formula to use in the given case is,
M1V1 = M2V2
Here M1 is the molarity of KOH, V1 is the volume of KOH, M2 is the molarity of sulfuric acid, and V2 is the volume of H2SO4.
Here V1 is 19.55 ml, M2 is 0.3467 M, and V2 is 2020 ml.
Now putting the values in the equation we get,
M1 * 19.55 = 0.3467 * 20.20
M1 * 19.55 = 7.00334
M1 = 7.00334/19.55
M1 = 0.3582 M
Hence, the molarity of the given KOH is 0.3582.
The molarity of a solution of potassium hydroxide is 0.3582M
To get the molarity of the solution of potassium hydroxide KOH, we will apply the formula;
[tex]C_1V_1=C_2V_2[/tex]
C₁ and C₂ are the concentration of the solutionV₁ and V₂ are volumes of the solutionGiven the following parameters;
C₂ = 0.3467M
V₂ = 20.20mL
V₁ = 19.55mL
C₁ = ?
Substitute the given parameters into the formula:
C₁ × 19.55 = 0.3467× 20.20
C₁ × 19.55 = 7.00334
C₁ = 7.00334/19.55
C₁ = 0.3582M
Hence the molarity of a solution of potassium hydroxide is 0.3582M
Learn more on molarity here: https://brainly.com/question/19555927
write 4 important of measurement?
Answer:
Measurement helps in buying and selling goods
Measurement helps in doing various science
experiment
Measurement is used in our daily life
Measurement is essential for making roads, bridge etc
Ammonium phosphate is an important ingredient in many solid fertilizers. It can be made by reacting aqueous phosphoric acid with liquid ammonia. Calculate the moles of ammonia needed to produce of ammonium phosphate. Be sure your answer has a unit symbol, if necessary, and round it to significant digits.
Answer:
The balanced chemical equation:
3 NH₃ + H₃PO₄ → (NH₄)₃PO₄
From the equation we see:
3 moles of NH₃ gives 1 mole (NH₄)₃PO₄
0.085 mole NH₃ will gives ?? mole (NH₄)₃PO₄
By cross multiplication:
number of moles of (NH₄)₃PO₄ = 0.085 * 1/3 = 0.028 mole
Explanation: