Barbiturates, including "truth serums" seen in movies like Meet the Fockers and sedatives that may have led to the untimely deat
h of Jimi Hendrix, are often synthesized using what type of reaction sequence involving two consecutive enolate alkylations
1 answer:
Answer:
Explanation:
Diethyl malonate possesses greater acidity compared to monocarbonyl substances (pKa=13) because its alpha hydrogens are linked to two carbonyl groups. Consequently, the malonic ester can be readily changed into its enolate ion by reacting it with sodium ethoxide in ethanol. When the malonic ester undergoes alkylation, a hydrogen atom in the alpha position becomes acidic, permitting another round of alkylation to yield a dialkylated malonic ester.
In this scenario, when diethyl malonate interacts with urea in the presence of sodium ethoxide base, the second alkylation step occurs within the molecule, producing a cyclic compound known as barbituric acid.
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1) Drift velocity:
2. electrons per individual
Explanation:
1)
In a conducting material with an electric current, the drift velocity of electrons can be calculated using this equation:
where
I stands for current
n represents the density of free electrons
indicates the charge of an electron
A signifies the wire's cross-sectional area
The wire's cross-sectional area can be determined as
where r denotes the wire's radius. Thus, the equation transforms to
In this scenario, we have:
I = 8.0 A as the current
indicates the free electron concentration
d = 1.5 mm is the diameter, making the radius
r = 1.5/2 = 0.75 mm =
So, the resulting drift velocity is:
2)
The entire length of the cord is
L = 3.00 m
And the cross-sectional area is
Consequently, the volume of the cord is
(1)
The number of electrons per unit volume is , thus the total electrons in this cord would be
Overall, the Earth's population rounds to 8 billion individuals, equating to
Hence, the number of electrons distributed to each person is:
Answer:
For A: The change in free energy for the reaction is -5339.76 J/mol
For B: Free energy change is expressed in kJ/mol
For C: The forward reaction favors progression, while the reverse reaction does not.
Explanation:
Regarding the specified chemical reaction:
- For A:
The relationship between standard Gibbs free energy and equilibrium constant is as follows:
The free energy change can be calculated using the following equation:
Or,
where,
= Change in free energy
R = Gas constant =
= standard temperature =
T = temperature of the cell =
= equilibrium constant =
Q = reaction quotient =
= 0.06 M
[DHAP] = 0.125 M
Substituting the values into the equation yields:
Thus, the change in free energy for the reaction is -5339.76 J/mol
- For B:
To convert the free energy change to kilojoules, we apply the conversion factor:
1 kJ = 1000 J
So,
Consequently, the free energy change's units are kJ/mol
- For C:
For spontaneity in the reaction, the Gibbs free energy must be negative. However, the calculations indicate a positive Gibbs free energy, leading to the conclusion that the reaction is not spontaneous.
The free energy change of the reaction is negative.
Consequently, the forward reaction is favored and the reverse reaction is not favored.