The mass of sample x is 20.0g it was placed in a graduated cylinder and the water level to from a to b. What is the density of t
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Answer:
Check the explanation
Explanation:
The concept used in this problem is based on Nuclear magnetic resonance spectroscopy. The peaks in the
spectrum are used to identify the structure of the compound.
First, identify the number of signals of a given compound. After that assign the values of the chemical shift to identified signals in the spectrum.
Fundamentals
Principle of spectroscopy:
The principle of
is that when the external magnetic field is applied, the energy is transferred from ground state to higher energy level and when the spin returns to ground state absorbed radio-frequency is emitted at the same frequency, that radio-frequency give the spectrum of the nucleus.
Chemical shift:
It is the difference between the resonance frequency of observed proton and tetramethylsilane .
is used as a reference in
spectroscopy. The chemical shift of
is
.
Spin multiplicity:
The formula to calculate spin multiplicity is n + 1n+1 , here nn is a number of hydrogens of neighboring carbon.
Interpretation of the spectrum:
• Firstly identify the different type of signals (protons).
• Look at the multiplicity, it tells the number of protons of neighboring carbon.
• Then see the position of the peaks, identify the chemical shift.
Some of the values of the chemical shift of are given as seen in the attached image below.
