Question

b. If pure (R)-2-bromobutane rotates light 100º to the right, how much rotation would occur for a solution with 80% (R)-2-bromobutane and 20% (S)-2-bromobutane

Answer 1

are we assuming that (S) rotates light by the same amount in the opposite direction?

Answer 2

I don't know... the question didn't say

Answer 3

but I guess if R rotates in one direction then S rotates in the other so I think its safe to assume that

Answer 4

so... total rotation= (100*0.8) + (-100*0.2)

Answer 5

Oh.... now I get it... Thank you :)

Answer 6

good stuff, no problem !

Answer 7

:)