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Questions and Answers
What is the quantum yield for the decomposition if 0.01 moles of HI molecules decompose to produce 3.0115×10^22 photons?
Which electronic transition is associated with a peak at λmax=280 nm in the UV spectrum of acetone?
Which electronic transition is associated with a peak at λmax=190 nm in the UV spectrum of acetone?
Which range of IR absorption is typical for the stretching vibration of the carbonyl group in simple aldehydes and ketones?
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What is the fundamental frequency of vibration of a CO molecule with a force constant of 2.66 x 10^3 N/m?
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What is the absorbance of the dye solution with a transmittance of 30% at 600 nm?
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What is the absorbance of a 0.02 M dye solution in a 3 cm cell for light of wavelength 6000Ao with a percentage transmittance of 40%?
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If the quantum yield for a reaction is 0.8, what does this indicate about the reaction?
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Stereochemistry deals with the study of molecules as two dimensional objects.
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If a substance absorbed 3.5 x 10^18 photons of light per second and 0.003 mole of it reacted in 25 minutes, what is the quantum yield of the reaction?
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Which law governs the relationship between the absorbance, molar absorption coefficient, concentration, and thickness of a solution?
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Structural isomerism refers to isomers with the same molecular formula but different arrangement of atoms.
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Chain isomerism arises due to the difference in arrangement of carbon atoms within a molecule.
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Optical isomerism is a type of structural isomerism where the atoms are arranged in completely different order.
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Tautomerism refers to compounds having the same molecular formula but different structural and physical/chemical properties.
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Is metamerism a common type of isomerism?
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Tautomerism involves equilibrium between two compounds with the same molecular formula?
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Functional group isomerism involves isomers with the same functional groups?
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In position isomerism, the basic carbon skeleton remains unchanged but important groups are moved around?
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Ring chain isomerism involves compounds with different molecular formulas?
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Study Notes
Quantum Yield and Photons
- Quantum yield is the number of molecules reacted per photon absorbed, calculated as the number of molecules reacted divided by the number of photons absorbed.
- If 0.01 moles of HI molecules decompose to produce 3.0115×10^22 photons, the quantum yield for the decomposition can be calculated.
Electronic Transitions and UV Spectra
- The peak at λmax=280 nm in the UV spectrum of acetone corresponds to a specific electronic transition.
- The peak at λmax=190 nm in the UV spectrum of acetone corresponds to a different electronic transition.
IR Spectra and Carbonyl Group
- The stretching vibration of the carbonyl group in simple aldehydes and ketones typically exhibits IR absorption in a specific range.
Molecular Vibration and Force Constant
- The fundamental frequency of vibration of a CO molecule can be calculated using its force constant, which is 2.66 x 10^3 N/m.
Absorbance and Transmittance
- The absorbance of a dye solution can be calculated from its transmittance, which is 30% at 600 nm.
- The absorbance of a 0.02 M dye solution in a 3 cm cell can be calculated for light of wavelength 6000Ao with a percentage transmittance of 40%.
Quantum Yield and Reaction Efficiency
- A quantum yield of 0.8 indicates that 80% of the absorbed photons result in a reaction.
Stereochemistry
- Stereochemistry is the study of molecules as three-dimensional objects, not two-dimensional objects.
Quantum Yield and Reaction Rate
- If a substance absorbs 3.5 x 10^18 photons of light per second and 0.003 mole of it reacts in 25 minutes, the quantum yield of the reaction can be calculated.
Beer-Lambert Law
- The Beer-Lambert Law governs the relationship between the absorbance, molar absorption coefficient, concentration, and thickness of a solution.
Types of Isomerism
- Structural isomerism refers to isomers with the same molecular formula but different arrangement of atoms.
- Chain isomerism arises due to the difference in arrangement of carbon atoms within a molecule.
- Optical isomerism is a type of structural isomerism where the atoms are arranged in a non-superimposable manner.
- Tautomerism refers to compounds having the same molecular formula but different structural and physical/chemical properties.
- Functional group isomerism involves isomers with the same functional groups.
- Position isomerism involves the movement of important groups around the basic carbon skeleton.
- Ring-chain isomerism involves compounds with different molecular formulas.
- Metamerism is a type of isomerism where the atoms are arranged in a different order.
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Description
Test your knowledge of absorbance and transmittance calculations with these two practice questions. Practice using the formula A = log(Io/I) to find absorbance and understand the relationship between transmittance and absorbance.
