The video tutorial explains how to calculate the percent enantiomeric excess for a solution containing R and S isomers of bromobutane. It details the conversion of mass to percentage and the calculation of enantiomeric excess. The tutorial also promotes a YouTube membership program, offering extended versions of organic chemistry videos, including exam reviews and practice tests.

How do you calculate the percentage of the R isomer in a solution containing 16g of R2-bromobutane and 4g of S2-bromobutane?

• Subtract the mass of S isomer from the mass of R isomer and multiply by 100

• Add the masses of both isomers and multiply by 100

• Divide the mass of R isomer by the total mass and multiply by 100

• Divide the mass of S isomer by the total mass and multiply by 100

What is the enantiomeric excess if a solution is 80% R and 20% S?

• 40%

• 60%

• 80%

• 20%

If a solution has 60% enantiomeric excess, what percentage is racemic?

• 60%

• 20%

• 80%

• 40%

What does a 60% enantiomeric excess indicate about the solution's composition?

• It contains equal amounts of R and S isomers

• It is a racemic mixture

• It contains 60% more R isomer than S isomer

• It is entirely composed of the R isomer

What is one benefit of joining the Organic Chemistry Tutor's YouTube membership program?

• Access to free videos only

• Access to extended video content

• Access to live tutoring sessions

• Access to physical textbooks

Which of the following is included in the membership program's video content?

• Basic introduction to organic chemistry

• Advanced calculus tutorials

• Physics experiments

• Biology lab techniques

What is the duration of the full version of the organic chemistry exam one review video?

• 2 hours

• 42 minutes

• 3 hours

• 1 hour

How long is the full practice test on SN2, S1, E1, and E2 reactions?

• 4 hours

• 3 hours

• 5 hours

• 2 hours

What is the total duration of the organic chemistry 1 final exam review video?

• 4 hours

• 7 hours

• 5 hours

• 6 hours

Where can you access all video playlists and exam review videos?

• chemistryhub.org

• organicchemistry.com

• video-tr.net

• youtube.com