The compound alanine has an S configuration based on the Fisher projection of the compound.
<h3>What is Fisher projection?</h3>
We know that the stereochemistry of a compound is very important in the study of organic chemistry. When we talk about the stereochemistry, we are talking about the way and manner in which the atoms that are found in the compound are arranged.
The configuration of the compound can be obtained when we look at the image of the fisher projection formula of the compound. There are two main configurations that the compound could have have. These are the R and S configurations.
The configuration would be assigned to the compound on the basis of the relative positions of the priority groups in the compound. We can see that in the fisher projection formula of alanine, the priority groups are assigned from left to right thus it has an S configuration.
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Explanation:
It is known that,
No. of moles = Molarity × Volume
So, we will calculate the moles of as follows.
No. of moles =
= 0.0125 mol
Now, the moles of KOH are as follows.
No. of moles =
= 0.0374 mol
And, =
= 0.0375 mol
Now, the balanced reaction equation is as follows.
This means 1 mole of produces 173.2 kJ of heat. And, the amount of heat produced by 0.0125 moles of is as follows.
M =
= 2.165 kJ
Total volume of the solution = (55.0 + 55.0) ml
= 110 ml
Density of the solution = 1.13 g/ml
Mass of the solution = Volume × Density
=
= 124.3 g
Specific heat = 3.78
Now, we will calculate the final temperature as follows.
q =
2165 J =
2165 - 469.854 =
17.417 =
T =
Thus, we can conclude that final temperature of the solution is .
<u>Answer:</u> The fraction of atom's mass contributed by nucleus is 0.99
<u>Explanation:</u>
Nucleons are defined as the sub-atomic particles which are present in the nucleus of an atom. Nucleons are protons and neutrons.
The isotopic symbol of Helium-4 atom is
Number of electrons = 2
Number of protons = 2
Number of neutrons = 4 - 2 = 2
We are given:
Mass of He-4 atom =
Mass of 1 electron =
Calculating the mass contributed by the nucleus =
Mass of the nucleus of He-4 atom =
To calculate the fraction of atom's mass contributed by the nucleus, we use the equation:
Putting values in above equation, we get:
Hence, the fraction of atom's mass contributed by nucleus is 0.99