i want to calculate the respective volume fraction of mix which is composed of water and ethanol to get the chi parameter，because we know this binary liquid can mix at any radio，so i think this chi parameter is small，but if use the soluble parameter ，the chi is to big that i dont think the chi can represent the true interaction，so i want try another way to get chi ，and i also use blend module to get chi which is small and i think it is reasonable.but how can i get the volume fraction of ethanol and water ，is there any formula i can use or some module in MS can help me to solve this problem？i would really appreciate if somebody can help me。