0.27  g of a long chain fatty acid was dissolved in 100  cm^3 of hexane. 10  mL of this solution ...

0.27  g of a long chain fatty acid was dissolved in 100  cm^3 of hexane. 10  mL of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is 10  cm. What is the height of the monolayer? [Density of fatty acid =0.9  g cm^-3 ; π=3 ]
(2019 Main, 8 April II)
(a) 10^-6 m
(b) 10^-4 m
(c) 10^-8 m
(d) 10^-2 m

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