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Chptr1PrblmSolns - 1.1-1.7 The solutions for these problems...

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1.1-1.7 The solutions for these problems are the solutions for problems 1.1-1.7 in the 2 nd edition Solutions Manual . 1.8 The washing machine is a batch reactor in which a first order decay of grease on the clothes is occurring. The integrated form of the mass balance equation is: kt C C - 0 e = First, find k : 1 - 0 0 0 min 0.128 0.88 1 ln min 1 1 0.88 ln min 1 1 ln 1 = = = = C C C C t k Next, calculate the grease remaining on the clothes after 5 minutes: ( ) ( )( ) g 0.264 e g 0.500 e 1 -1 min .00 5 min 128 . 0 - - 0 = = = kt m m The grease that is not on the clothes must be in the water, so g/L 0.00472 L 50.0 g 0.264 - g 0.500 w = = C
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