What is the density of hexane? Will hexane float on water?
Have you never seen an oil slick?
Hexanes is certainly immiscible in water. Given the density, hexanes will float on water.
We take this from Archimedes of Syracuse, who in the 3rd century BC, stated " Any object, wholly or partially immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object.
When you use a separating funnel in chemistry, the hexanes layer will always be the top layer, and the aqueous layer is drained off first.