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Write the mass balance equation for a plug-flow system stream with a second order decaying substance,...

Write the mass balance equation for a plug-flow system stream with a second order decaying substance, C.

Find the steady state concentration of C 5km downstream.

The rate constant is 0.3 L mg-1 day-1,

the mean velocity of the river is 0.5 m/s,

and the concentration of C at x=0 is 100mg/l.

Sketch a plot of 1/C as a function of x.

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