Enter the number of unique signals in the 1H NMR spectrum of ethanol. Assume that the hydroxy proton does NOT exchange with the
1 answer:
Answer:
In the 1H NMR spectrum of ethanol three different signals are observed, this is due to the existence of 3 types of hydrogens with different chemical environment. Hydrogens A (3.57 ppm) are more screened than C (1.10 ppm) due to the presence of oxygen (electonegative atom that removes electron density). The chemical environment of hydrogen B (4.78 ppm), attached directly to oxygen, is also different by resonating at a frequency different from the previous ones.
The hydroxylic hydrogen produces a singlet, the pair of carbon hydrogens one give rise to a quadruplet and the three hydrogens of carbon two produce a triplet.
Explanation:
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Answer:
Approximately .
Explanation:
Balanced equation for this reaction:
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Look up the relative atomic mass of elements in the limiting reactant, , as well as those in the product of interest,
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Calculate the formula mass for both the limiting reactant and the product of interest:
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Calculate the quantity of the limiting reactant () available to this reaction:
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Refer to the balanced equation for this reaction. The coefficients of the limiting reactant () and the product (
) are both
. Thus:
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In other words, for every of
formula units that are consumed,
of
formula units would (in theory) be produced. Thus, calculate the theoretical yield of
in this experiment:
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Calculate the theoretical yield of this experiment in terms of the mass of expected to be produced:
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Given that the actual yield in this question (in terms of the mass of ) is
, calculate the percentage yield of this experiment:
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