Saccharomyces cerevisiae is commonly used for the production of ethanol from glucose via fermentation. Typical kinetic parameters for this organism performing this process are:

Y = 0.1 gVSS/g glucose

umax = 0.46 h^-1

Ks = 100 mg glucose/L

b = 0.05 day-1

If ethanol is continuously produced in a chemostat (a reactor in which the hydraulic retention time is equal to the solids retention time) with a hydraulic retention time of 5 hours, and the influent glucose concentration is 25 g glucose/L, estimate effluent glucose concentration (in mg glucose/L).