Answer:
The question is incomplete. Searching in google I found: A 3.96x10⁻⁴ M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvette. A blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A.
The molar absorptivity of compound A is 1502.5 M⁻¹cm⁻¹.
Explanation:
The question is incomplete. Searching in google I found: A 3.96x10⁻⁴ M solution of compound A exhibited an absorbance of 0.624 at 238 nm in a 1.000-cm cuvette. A blank solution containing only solvent had an absorbance of 0.029 at the same wavelength. Find the molar absorptivity of compound A.
The absorbance (A) is given by:
[tex] A = \epsilon cl [/tex]
Where:
c: is the concentration of compound A = 3.96x10⁻⁴ M
ε: is the molar absorptivity of compound A =?
l: is the pathlength = 1 cm
[tex]A_{s}[/tex]: is the absorbance of the solution= 0.624
[tex]A_{b}[/tex]: is the absorbance of the blank solution= 0.029
First, we need to find the absorbance of compound A:
[tex] A = A_{s} - A_{b} = 0.624 - 0.029 = 0.595 [/tex]
Now, we can calculate the molar absorptivity of compound A:
[tex] \epsilon = \frac{A}{cl} = \frac{0.595}{3.96 \cdot 10^{-4} M*1 cm} = 1502.5 M^{-1}cm^{-1} [/tex]
Therefore, the molar absorptivity of compound A is 1502.5 M⁻¹cm⁻¹.
I hope it helps you!
Determine the number of moles of Sulfur in 3.73 x 1035 atoms of S?
The number of moles : 6.2 x 10¹¹
Further explanationThe mole is the number of particles contained in a substance
1 mole = 6.02.10²³ particles
[tex]\tt N=n\times No[/tex]
N = number of particles
n = moles
No = Avagadro's number : 6.02.10²³
3.73 x 10³⁵ atoms of S
the number of moles :
[tex]\tt \dfrac{N}{No}=\dfrac{3.73\times 10^{35}}{6.02\times 10^{23}}=6.2\times 10^{11}[/tex]
Bonds are broken in an____
reaction.
a). Endergonic
b). Exergonic
Answer:
Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions.
Explanation:
Reactions where chemical bonds are broken, releasing the energy in those bonds, are often exergonic reactions. These reactions where chemicals are broken down are called “catabolism” – the destructive part of metabolism. By contrast, reactions where chemical bonds are formed are often endergonic.
By titration, it is found that 47.5 mL of 0.146 M NaOH(aq) is needed to neutralize 25.0 mL of HCl(aq). Calculate the concentration of the HCl solution.
Answer:
The correct answer is 0.277 M HCl
Explanation:
NaOH is a strong base and HCl is a strong acid. NaOH reacts with HCl to form a salt (NaCl) and water via a neutralization reaction, as follows:
NaOH + HCl → NaCl + H₂O
At the equivalence point, the moles of NaOH added is equal to the moles of HCl present in the solution to be titrated. Moreover, the moles can be calculated as the product of the concentration of base or acid (Cb or Ca) and the volume (Vb and Va), as follows:
moles NaOH = moles HCl
Cb x Vb = Ca x Va
Thus, we calculate the concentration of HCl (Ca), as follows:
Ca = (Cb x Vb)/Va = (0.146 M x 47.5 mL)/(25.0 mL)= 0.277 M
Why doesn’t the reaction: Br2(aq) + 2NaCl(aq) → Cl2(aq) + 2NaBr(aq) occur? In other words, why don’t the two Br atoms stop sharing an e pair with each other to exist as Br2 and each take an e from the available two Cl ions instead? Answer with respect to the relative E.A. values for Cl and Br. /2
Answer:
Chlorine has higher Electron Affinity as compared to Bromine
Explanation:
Electron affinity is defined as the Potential energy change of the atom when an electron is added to a neutral gaseous atom. Therefore, more the Negative electron affinity, more favorable will be the electron addition process.
The electron affinity of Chlorine is -349kJmol^-1
The electron affinity of Bromine is -324.6KJmol^-1
This clearly shows that Chlorine is a much better Atom to be bonded with, That is the reason why in the reaction is not feasible.
[tex]Br2(aq) + 2NaCl(aq)[/tex] →[tex]Cl2(aq) + 2NaBr(aq)[/tex]
Therefore, Chlorine has higher electron Affinity as compared to Bromine and that what makes it a much better atom to be bonded with Na. So the above reaction is not possible.
Plz help!!!!!!!!!!!!!
Answer:
message on messenger johnpatrick , so I can give help you
H= aC+ b what does this mean?
Answer:
I think it's Hydrogen is equal to aCalcuim plus b
ano ang scientific method
Answer:
The scientific method is an empirical method of acquiring knowledge that has characterized the development of science since at least the 17th century. It involves careful observation, applying rigorous skepticism about what is observed, given that cognitive assumptions can distort how one interprets the observation.
When the equation below is correctly balanced, what is the coefficient for Fe?
Answer:
2Fe + 3Cl=2FeCl3 therefore the coefficent for Fe is 2.
Explanation:
Again can somebody help me with these please and explain ? if anything like you are good at it can you text me and help me if you do not mind. I am having very trouble on this
Answer:
answers
1. 3
2. Symbol
3. I cant see it
4.Chemical Equation
Explanation:
O3 means 3 atoms in oxygen
symbol because elements need symbols
Answer:
4.C, 5.D, 6.A, 7.A ,and is 8.A
What keeps galaxies togther? How?
The total length of
mid-ocean ridge spreading centers is about 80,000 km. The average
spreading rate of ridges is 1.25 cm/yr. Calculate the area of new
ocean crust that forms each year.
Answer: In fact, all of the major landforms that we find on the continents ... Mid-ocean ridges, also called seafloor-spreading centers, are long, ... 1 km = 100,000 cm or 1 x 105 cm ... a mid-ocean ridge with a SLOW spreading rate (1 to 5 cm/yr, full rate).
Explanation:
As the Earth's tectonic plates separate, new ocean bottom is generated along divergent plate borders, which are known as mid-ocean ridges. Massive basalt volcanic eruptions result from molten rock rising to the seafloor as the plates divide.
What is mid-ocean ridge?A mid-ocean ridge is a system of seafloor mountains formed by plate tectonics. It is typically about 2,600 meters deep and rises about 2,000 meters above the deepest part of an ocean basin. This feature occurs when seafloor spreading occurs along a divergent plate boundary. Mid-ocean ridges are geologically significant because they occur along the type of plate boundary that creates new ocean floor as the plates spread apart. As a result, the mid-ocean ridge is also referred to as a "spreading center" or a "divergent plate boundary." The plates separated at rates ranging from 1 cm to 20 cm per year.To learn more about Mid-ocean ridge, refer to:
https://brainly.com/question/1288447
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In the laboratory you are asked to make a 0.721 m potassium chloride solution using 255 grams of water.
How many grams of potassium chloride should you add?
_____ grams.
Answer:
Mass = 13.42 g
Explanation:
Given data:
Molality of potassium chloride solution = 0.721 m
Mass of water = 255 g (255 g /1000 = 0.255 Kg)
Potassium chloride added = ?
Solution:
Molality:
Molality = number of moles of solute/ Kg of solvent
0.721 m = moles / 0.255 Kg
m = mol/Kg
Moles = 0.721mol/Kg×0.255 Kg
Moles = 0.18 mol
Mass of potassium chloride:
Number of moles = mass/molar mass
0.18 mol = Mass /74.55 g/mol
Mass = 0.18 mol × 74.55 g/mol
Mass = 13.42 g
Bohr’s model of the atom compares electrons to ____________________ .
Answer:
The Bohr model shows that the electrons in atoms are in orbits of differing energy around the nucleus (think of planets orbiting around the sun). ... He said that the energy of an electron is quantized, meaning electrons can have one energy level or another but nothing in between.
Explanation:
9. How many protons, neutrons, and electrons does 35C1l- have?
O 17 protons, 16 electrons, 18 neutrons
O 16 protons, 17 electrons, 18 neutrons
017 protons, 18 electrons, 18 neutrons
O 17 protons, 17 electrons, 18 neutrons
help press the pic can you help
Answer:
A
Explanation:
Answer:
its the first one because all together it has to have ten square things
de, it
this is a
your
Sample Response: This is a chemical change
because new substances are formed with different
properties and identities.
What did you include in your response? Check all that
apply
rmed with
This is a chemical change.
New substances are formed.
The properties and identities of the original
substances are changed.
If u click on all of them it gives u an A+ and doesn’t even read what u wrote. So u never really have to try hard on the writing parts just tell them u included them all
Answer:An image will not be formed.
Rays do not converge to or diverge from a common point.
/select all that apply
Explanation:
What is the molarity of a solution containing 18.2 g of KCl in 215 mL of KCl solution?
Answer:
The sum would be 69109.4944 ml if that's what you were asking
which isotope has 30 neutrons and 32 protons
Answer:
Germanium
Explanation:
Help me plz plz plz plz plz plz plz plz plz plz plz plz plz :(
What do you still wonder about Elisa’s condition or how her body gets what it needs to function?
Answer:
My group believes that Elisa has Staphylococcus Aureus. I think that she does have the manifestation of the colonies condition because she tested positive to clumping factor, coagulase, hemolysins and thermostable deoxyribonuclease, which are used to identify S aureus. Commercial latex agglutination tests conducted on her blood sample also tested positive to the S aureus. For further clarifications, my Group also used biotyping kits for the identification of S epidermidis for commercial confirmation.
However, the catalase test was conducted to distinguish streptococci (catalase-negative) staphylococci which are catalase positive. The test was performed by flooding an agar slant or broth culture with several drops of 3% hydrogen peroxide. Catalase-positive cultures bubble at once.
Explanation:
I have a question, is this in Edge 2020?
And anyway,
Hope this helped! :)
why boiling point is more when vanderwall force if more?
Answer:
It is the intermolecular forces acting between the molecules that cause attractions between them making them liquids or solids. The strength of Van der Waals forces depends primarily on the number of electrons in total in the molecule, so larger molecules will have higher boiling points.
Explanation:
Calculate the mass of water produced when 1.36 g of butane reacts with excess oxygen.
Answer:
Mass of water produced= 1.8 g
Explanation:
Given data:
Mass of water produced = ?
Mass of butane = 1.36 g
Mass of oxygen = excess
Solution:
Chemical equation:
2C₄H₁₀ +13 O₂ → 8CO₂ + 10H₂O
Number of moles of butane:
Number of moles = mass/molar mass
Number of moles = 1.36 g/ 58.12 g/mol
Number of moles = 0.02 mol
Now we will compare the moles of butane with water.
C₄H₁₀ : H₂O
2 : 10
0.02 : 10/2×0.02 = 0.1 mol
Mass of water produced:
Mass = molar mass × molar mass
Mass = 0.1 mol × 18 g/mol
Mass = 1.8 g
Na₂S
Naming ionic compound
Answer:
Sodium Sulfide
Explanation:
I looked it up
if i have 2.4 moles of gas held at a temperature of 97 c and in a container with a volume of 45 L , what is the pressure of the gas
Answer:
1.62 L
Explanation:
T= 97+273.15= 370.15
R= 0.08206 atm/mol⋅K
V= 45 L
n= 2.4 mol
P= (n⋅R⋅T)/V
= (2.4 x 0.08206 x 370.15)/(45) = 1.61997 = 1.62
The pressure of the gas is 1.62 atm. This can be calculated by using ideal gas law that gives direct relation between P,V and T
Ideal gas Law:This law states that pressure and volume are directly proportional to the temperature of the gas.
What information do we have?
T= 97+273.15= 370.15 K
R= 0.08206 atm/mol⋅K
V= 45 L
n= 2.4 mol
To find:
P=?
Ideal gas law is given by:
PV=n.R.T
P= (n⋅R⋅T)/V
P= (2.4 x 0.08206 x 370.15)/(45)
P= 1.61997
P= 1.62 atm
Thus, the pressure of the gas is 1.62 atm.
Find more information about Ideal gas law here:
brainly.com/question/12873752
Which of the following processes is exothermic?
a.
sublimation of carbon dioxide
b.
evaporation of ammonia
c.
fusion of ethanol
d.
condensation of water
e.
vaporization of water
Answer:
d. condensation of water
Answer:
I believe the answer is D). condensation of water.
Hope this helps, have a great day/night and stay safe!
Select the sentences in the paragraph that explain only the dark lines that are produced in the absorption spectra. Select all that apply.
A light is shown through a cold, dilute gas. Over time, excited atoms revert to their original lower energy state. Photons emitted travel in different directions that the original photon. Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons. Dark lines in an absorption spectrum of light can be seen when the gas lies between the light source and observer.
Answer:
Gaps are produced in the light spectra that correspond to wavelengths of absorbed photons.
Explanation:
When electrons in atoms absorb energy, they move from a lower energy level to a higher energy level. With time, they revert to the their original energy state emitting a photon of light of appropriate wavelength.
The absorbed photons do not show up in the spectrum. They appear as dark lines in the spectrum. Hence, the absorption spectrum is the exact inverse of the emission spectrum. The dark lines in the spectrum indicates that the colors that ought to occupied those points there have been absorbed.
Which rock type is an example of igneous glass?
1. lava
2, gabbro
PLS HURRY
3. obsidian
4. rhyolite
Answer:
obsidian
Explanation:
because it is an igneous rock which is smooth
Answer:
B) Obsidian
Explanation:
Since the igneous glass last not very long like you could say obsidian compared to normal ones.
How many equivalents are present in 13.5g of Al3+
One mole of Oxygen molecule contain how many atoms of oxygen
Answer:
6.02 X 1023 atoms of oxygen.
Explanation:
One mole of atoms of oxygen has a mass of 16 g, as 16 is the atomic weight of oxygen, and contains 6.02 X 1023 atoms of oxygen.
the number of oxygen atoms an oxygen molecule has is two oxygen atoms
What determines a molecules shape?
Answer:
the shape of a molecule. The shape of a molecule is determined by the location of the nuclei and its electrons. The electrons and the nuclei settle into positions that minimize repulsion and maximize
Explanation:
hope this helped
A chamber is divided into two halves by a non insulating movable partition. Air in one side is at a higher pressure than air in the other side. The partition is moved causing the higher pressure side to expand and the lower pressure side to contract. What is the sign, positive or negative, of the change in entropy for; the high pressure side, the low pressure side, and the total of the two
Answer:
( -, + , + )
Explanation:
The sign of the change in entropy for
High pressure side , low pressure side and the Total of the two =
( -, + , + )
The expansion of the Higher pressure side of the chamber will lead to a negative (- )change in entropy while the contraction of the lower pressure side of the chamber will cause a positive ( + ) increase in the change of entropy