In a famous experiment, Stanley Miller provided evidence for the theory of evolution. He placed CH4, NH3, H2, and H2O in a glass sphere and excited the gases using electricity and UV light. If the partial pressures of the gases were 340 mm Hg, 125 mm Hg, 65 mm Hg, and 100 mm Hg, what was the total pressure in the glass sphere?

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?