[jena]

Hi,

I have two questions the first one is:

Give a mixture of enantiomers with observed rotation of -38 degrees and specific rotation of 50, what percentage (+) enantiomers does the mixture have?

My answer: 88,

I got this answer by this equation:
 (38/50+1)/2

My other question is:

What is the optical rotation value of pure (+) enantiomers if a 1:3 mixture of (+) enantiomers rotates light -25?

My answer: 75


Are any of these answers correct? If not please explain to me what I may have did wrong.

Thank you