Question

An organic fatty acid forms a surface film on water that obeys two-dimensional ideal gas law. If the surface tension lowering is 10 m.N- at 25°C, then surface excess concentration is given by : (1) 40.4x100 molm (2) 4.04x100 molin (3) 404x10-6 molm-2 (4) 0.404 x 10-6 mol m - 2?

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Answer 1

Answer:

Surface film pressure equation (π) = τ2RT

Surface excess concentration  

Therefore, π = surface tension. N = number of molecules.

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