The following figure shows a chromatogram of a known mixture of barbiturates. Based on this figure, answer the following questions: a. What barbiturate detected by the chromatogram had the longest...

The following figure shows a chromatogram of a known
mixture of barbiturates. Based on this figure, answer the
following questions:
a. What barbiturate detected by the chromatogram had
the longest retention time?
b. Which barbiturate had the shortest retention time?
c. What is the approximate retention time of
amobarbital?