The first peak on the chromatogram (identified as n-propyl benzene) was observed at a distance of 5.11 cm from the injection point marked on the chart and the second peak (identified as isopropyl benzene) was observed at a distance of 7.88 cm from the injection point. What was the retention time for n-propyl benzene (in seconds)

What is a main difference between a mixture and a pure substance? a mixture is only a liquid, but a pure substance can be in any state.a mixture looks the same throughout, but a pure substance does not.1 a mixture can vary in composition, but a pure substance has a set composlo a mixture can be made up of a single compound, but a pure substance car