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What is the equation for solute flux across the interface?

What is the equation for solute flux across the interface? Correct Answer NS = kR(CR – CRi)

The equation for solute flux across the interface is NS = kR(CR – CRi) where, NS is the solute flux, kR is the mass transfer coefficient in raffinate side film, CR is the concentration of the raffinate, CRi is the interfacial concentration on the raffinate side.

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