What molecule is removed during dehydration synthesis.

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Tell me the iupac names of the following alcohols:

Liquid from a brewery fermentation contains 10% ethanol and 90% water. part of the fermentation product (50,000 kg/h) is pumped to a distillation column on the factory site. under current operating conditions, a distillate of 45% ethanol and 55% water is produced from the top of the column at a rate of one-tenth that of the feed. what is the composition of the waste "bottoms" from the still?