15489
The predictions are based on three theories : ( 1 ) the Darken relation , linking the mutual diffusivity to the self diffusivities , ( 2 ) the generalised Stokes - Einstein relation for the solute self diffusivity , and ( 3 ) the free volume theory for water self diffusivity .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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