The molar absorptivity of a compound at 500 nm wavelength is 252 M-1cm-1. Suppose one prepares a solution by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution. What would be the absorbance in a 3 .00 mm pathlength cell?
Answers
Answer:
The absorbance of the solution is 0.21168.
Explanation:
Given that,
Wavelength = 500 nm
Molar absorptivity = 252 M⁻¹ cm⁻¹
Number of moles = 0.00140
Volume of solution = 500.0 mL
Length = 3.00 mm
We need to calculate the molar concentration
Using formula of the molar concentration
[tex]C=\dfrac{N}{V}[/tex]
Where, N = number of moles
V = volume
Put the value into the formula
[tex]C=\dfrac{0.00140}{0.5000}[/tex]
[tex]C=0.0028\ M[/tex]
We need to calculate the absorbance of the solution
Using formula of absorbance
[tex]A=\epsilon C l[/tex]
Put the value into the formula
[tex]A=252\times0.0028\times0.300[/tex]
[tex]A=0.21168[/tex]
Hence, The absorbance of the solution is 0.21168.
The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.212.
First, we will calculate the molarity of the compound, which is equal to the moles of solute divided by the liters of solution.
[tex]M = \frac{0.00140mol}{0.5000L} = 0.00280 M[/tex]
Then, we will convert 3.00 mm to cm using the conversion factor 1 cm = 10 mm.
[tex]3.00 mm \times \frac{1cm}{10mm} = 0.300 cm[/tex]
Finally, we will calculate the absorbance of the compound using the Beer–Lambert equation.
[tex]A = \epsilon \times b \times C[/tex]
where,
A: absorbanceε: molar absorptivityb: length of light pathC: molar concentration[tex]A = \epsilon \times b \times C = \frac{252}{M.cm} \times 0.300 cm \times 0.00280 M = 0.212[/tex]
The absorbance of a compound, with a molar absorptivity at 500 nm wavelength of 252 M⁻¹ cm⁻¹, prepared by dissolving 0.00140 moles of a solute in enough water to make a 500.0 mL solution, measured in a 3 .00 mm pathlength cell, is 0.212.
You can learn more about the Beer–Lambert law here: https://brainly.com/question/24571070?referrer=searchResults
Related Questions
What is the volume of the toy car that has a density of 3 g/mL and a mass of 75 g.
Answers
Answer:
The volume of car having density 3 g/mL and mass 75 g is 25 mL.
Explanation:
Given data:
Volume of car = ?
Density of car = 3 g/mL
Mass of car = 75 g
Solution:
The given problem will be solved through density formula.
Density:
Density is equal to the mass of substance divided by its volume.
Formula:
D=m/v
D= density
m=mass
V=volume
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3 g/mL = 75 g/ v
v = 75 g/ 3 g/mL
v = 25 mL
The volume of car having density 3 g/mL and mass 75 g is 25 mL.
Which piece of ice has the most themal energy
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B. 10 g ice cube at -1c
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Explanation:
just because 1111111111111111111
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(A) isolate
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Answers
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Answers
Answer:
11.2
Explanation:
Find molar mass of carbon 12.01 g/mol then divide by 6.00 g of Carbon, then divide by STP 22.4 L = 11.19 and round to sig fig = 11.2 L
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For this question, use the formula PV=nRT firstly, define your knowns (this requires you to calculate moles of carbon)
Molar mass of carbon = 12.01 g/mol
Moles carbon=[tex]\frac{mass}{molar \;mass}[/tex]
Moles carbon=[tex]\frac{6.00 g}{12.01 g/mol }[/tex]
Moles carbon= 0.4995836803 moles
P=101.3 kPa
V=?
n= 6.0÷12 = 0.5
R= 8.31
T= 273 K
V= (0.5 x 8.31 x 273) ÷101.3
=11.19
Therefore, 11.2 L of carbon dioxide will be produced.
Learn more about the ideal gas here:
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A proton is a subatomic particle carrying a charge equal to but opposite that of an electron
true
false
Answers
Answer:
True
Explanation:
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Neutrons have no charge, hence their name neutron which is similar to neutral.
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Answers
Answer:
The answer is 1.43 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 57.6 g
volume = 40.25 cm³
We have
[tex]density = \frac{57.6}{40.25} \\ = 1.431055900...[/tex]
We have the final answer as
1.43 g/mLHope this helps you
Unknown: density
Density = mass/volume
density = 57.6 g/40.25 cm3
density =1.43 g/ cm3
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Answers
Answer:
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Explanation:
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Answer:
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Answer:
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a. greater number of energy levels b. larger nuclei
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Answer:
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Explanation:
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Quick answer
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c:No
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Answer:
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Answer:
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Answer:
A.
Explanation:
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Answer:
A. Is the correct answer.
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Answer:
no it's part of chemistry to play thing exploring OR not.
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Chemistry is the scientific discipline involved with elements and compounds composed of atoms, molecules and ions: their composition, structure, properties, behavior and the changes they undergo during a reaction with other substances.
A substance that conducts electricity, is malleable, ductile, and has luster would be classified as a
A) compound.
B) element.
C) metal.
D) nonmetal.
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That it is hard to compress
Explanation:
In a one or two paragraph summary explain why Sodium light is Orange and Potassium light is lilac when placed in a flame.
Use the words: electron, quantum jump, ground state, orbitals, photons, emitting, absorbing, light spectrum, energy mass (words are not in order)
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Answer:
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Explanation:
Think about atoms, molecules, elements, and compounds. How can you relate it to your own body? To the world around you, right now? Please explain in four sentences.
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Answer:
Everything we see comes from the transferring of electrons, or redox reactions. Fire, the screen you are staring at, and many other chemical reactions that happen everyday, we don't even care to notice anymore. Everything in our bodies is made up of compounds, from simple things such as H2O, and to the food we eat, loaded with sugar, C12H22O11. From the para-benzoic acid on your sunscreen, to the O3 in the ozone layer high above us.
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bhag bhag aaya sheer
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Answer:
i dont undersstand lol
Explanation:
Explanation:
bhag bhag aaya sheer
..........
A hot lump of 30.5 g of iron at an initial temperature of 52.7 °C is placed in 50.0 mL H2O initially at 25.0 °C and allowed to reach thermal equilibrium. What is the final temperature of the iron and water, given that the specific heat of iron is 0.449 J/(g·°C)? Assume no heat is lost to surroundings.
final= _______ degrees Celsius
Answers
Answer:
26.7°C
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Where; Q = amount of heat
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Hence, the final temperature of water and iron is 26.7°C
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Is there more?
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