Please provide explanation for each answer. Thank you!

a.) A nearby factory is rumored to be contaminating the drinking water supply in your area so you took samples and performed an analysis. Your results found that a 1000-ml sample of water is contaminated with 20 mg/L Toluene. What is the molarity of the solution? b.) After extraction of herbal extracts, it needs to be concentrated by driving off the water content thereby increasing solids content. A freshly extracted and strained extract containing 8 wt% solids is fed to a concentrator. In the concentrator, water is removed and the solids content increased to 60 wt % solids. For 500 kg/h entering, calculate the amounts of the outlet streams of concentrated juice and water