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Katherine A.
Chemistry Tutor: PhD in chemistry/Postdoctoral Scientist/Over 10 Years of Tutoring Experience/Over 5 Years of Teaching Experience.
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Organic Chemistry
TutorMe
Question:

What is the configuration of the alkene in the estrogen antagonist Norethynodrel (R, S, E, or Z)? Provide a short explanation of your rationale. The structure can be found at the following link: https://pubchem.ncbi.nlm.nih.gov/compound/norethynodrel#section=2D-Structure

Katherine A.
Answer:

The configuration of the alkene is E, because the highest priority groups are opposite sides of the double bond. Z would indicate that the highest priority groups are on the same side of the double bond. Additionally, R and S describe the stereochemistry of sp3 carbons, not sp2 carbons as seen in the alkene bond in question.

Writing
TutorMe
Question:

Incorporate the words "there", "their", and "they're" appropriately in 2-3 sentences.

Katherine A.
Answer:

There is often quite a bit of confusion regarding which of these three words to use in a written document. Students writing their college applications should be particularly mindful of such details since they're often aiming to make a good first impression.

Chemistry
TutorMe
Question:

Calculate the density of NO2 gas at 0.97 atm and 30 degrees C. (Atomic weights: N = 14.0 amu; O = 16.0 amu; assume NO2 is an ideal gas and R = 8.314 J mol-1 K-1 and 0.0821 L-atm mol-1 K-1) (Show all work)

Katherine A.
Answer:

PV = nRT; assume 1 gram sample – V = nRT/P = (1 g / 46 g mol-1)(0.0821)(303) / 0.97 = 0.557 L Density = g / mL = 1 g / 557 mL = 0.00179 g / mL

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