Atoms combine because they are all working toward getting 8 valence electrons, except for noble gases. It is in their nature.
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Answer:
E) None of these
Explanation:
For this question, we must remember the definition of a <u>chiral carbon</u>. In the chiral carbons, we have <u>four different groups</u> around the carbon.
So, an achiral molecule would be a molecule that does not have chiral carbons. That is, in an achiral molecule in all carbons we have at least one repeating group.
In all the molecules, which we have in the question, we have absolute configuration. That is, we have chiral carbons. In molecule A we have two chiral carbons (R and R), in molecule b we have two chiral carbons (R and S), in molecule c we have two chiral carbons (S and S) and in molecule d we have two chiral carbons (R and S). <u>Therefore in all molecules, we have chiral carbons.
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Now, if we analyze molecules a and c, we have a <u>plane of symmetry</u>. If we have a plane of symmetry, even though there are chiral carbons, there will be <u>no optical activity</u>. That is, these molecules do not have the ability to deflect polarized light despite having chiral carbons. Therefore molecules a and c are <u>meso compounds</u>.
<em>But optical activity is not related to chirality.</em>
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See figure 1 to further explanations
I hope it helps!
The atomic radius increases as you go down a group.
Answer:
3,8×10⁻⁵ mol/L of potassium permanganate solution
Explanation:
To calculate concentration in mol/L you must convert the 3,8 umol to moles and 100 mL to liters, knowing 1 umol are 1×10⁻⁶mol and 1L are 1000 mL.
3,8 umol × (1×10⁻⁶mol / 1 umol ) = 3,8×10⁻⁶mol of potassium permanganate.
100 mL × ( 1L / 1000 mL) = 0,100 L
Thus, concentration in mol/L is:
3,8×10⁻⁶mol / 0,100 L = 3,8×10⁻⁵ mol/L of potassium permanganate solution
I hope it helps!
Answer:
13.4%
Explanation:
Take the molar mass (26.98) of Al x 2 because there are 2 moles in the given compound. Divide this number by the total molar mass of the compound (401.9) this gives you .134. To get a percentage mulitply by 100 for 13.4%.
[(26.98 x 2)/401.9] x 100 =13.4