Which is the number of atoms in 4.5 moles of Hg, correctly written in scientific notation with the correct number of significant
2 answers:
<u>Answer:</u> The correct answer is
<u>Explanation:</u>
We are given:
Moles of mercury = 4.5 moles
According to the mole concept:
1 mole of an element contains number of atoms.
So, 4.5 moles of mercury will contain number of atoms.
The rule that must be applied for the multiplication and division in significant figures is:
The least number of significant figures in any number of the problem determines the number of significant figures in the answer.
Here, the least precise significant number in problem are 2. Thus, the answer must also contain 2 least significant numbers.
Therefore, the correct answer becomes
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Answer:
The structure with the ring flipped is the most stable
Explanation:
We have the trans 1,2 - dimethylcyclohexane. With the wedge/dash structure we could not figure is this form is stable (If we do a comparison with the cis structure). But when we do a chair structure and ring flipped structure, this is easier to look.
The picture attached shows the structures, they are labeled as 1, 2 and 3, according to this problem.
In the chair structure, according to the picture below, you can see that both methyls are heading in the axial positions of the ring (One facing upward and the other downward). This is pretty stable, however, when the methyls are in those positions, the methyl position 1, can undergoes an 1,3 diaxial interactions with the hydrogens atoms (They are not drawn, but still are there), so this interaction makes this structure a little less stable that it can be.
On the other side, the ring flipped structure, we can see that both methyls are in the equatorials positions of the ring, and in these positions, it can avoid the 1,4 diaxial interactions with the hydrogens atoms, making this structure the most stable structure.
Hope this helps
