# HW1 - Department of Civil and Environmental Engineering...

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Department of Civil and Environmental Engineering Carleton University ENVE 2001, Winter 2016 Homework 1 (Due January 26) Problem 1. A gas mixture consists of three components: argon (Ar), B, and C. The following analysis of this mixture is given: 40.0 mole % argon, 18.75 mass % B, 20.0 mole % C. The molecular weight of Ar is 40 and the molecular weight of C is 50. a. What is the molecular weight of B? b. What is the average molecular weight of the mixture? Problem 2 Chlorophenols impart unpleasant taste and odor to drinking water at concentrations as low as 5 mg/m 3 . They are formed when the chlorine disinfection process is applied to phenol- containing waters. What is the threshold for unpleasant taste and odor in units of (a) mg/L, (b) g/L, (c) ppm, (d) ppb? Problem 3. Leachate is produced when precipitation infiltrates a sanitary landfill, contacts the waste material, and appears at the bottom of the stored waste. Assume 6 kg of benzene (molecular formula of C 6 H 6 ) were placed in the landfill and it is all dissolved in 100,000 gallons of leachate produced during 1 year. What is the benzene concentration in leachate during this 1
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