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HW1-soln

HW1-soln - ChEE 201 Fall 2008 HW 1 1 On Dr Blowers placed...

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ChEE 201 Fall 2008 HW 1 1) On June 14, 2008, Dr. Blowers placed 13 pounds of dirty laundry in the washing machine and washed it in cold water. The weight of the wet laundry after completing the spin cycle was 17 pounds. Dr. Blowers then had the choice of two methods of drying his laundry, either air dry it by hanging it out on a clothesline or by running it through his gas dryer. In this case, he hung it out to dry. After pulling the laundry in, he found the clean laundry now weighed 12.5 pounds. Determine: a) the mass of dirt removed in kilograms during washing b) the moles of water removed Solution : a) The mass of dirt removed is: ( 29 kg lb kg lb 2273 . 0 2 . 2 5 . 12 13 = - b) The moles of water removed by drying is: ( 29 mol g mol kg g lb kg lb 57 . 113 01 . 18 1000 2 . 2 5 . 12 17 = - 2) Wikipedia answers states, "Federal regulations mandate new shower heads flow less than 2.5 gallons per minute with a line feed pressure of 80 pounds per square inch. Although actual consumption varies with water pressure at the shower head inlet and the exact flow rate of the shower head, a reasonable average for a 5 minute shower using a low-flow head would be 7-8 gallons of water. This is because most homes have far less than 80 psi line pressure, the typical pressure being around 50 psi." Assume that every household in Tucson has a showerhead with the reasonable average flowrate.

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