You had a 5 gram sample , how much of the original substance would remain after 1 half- life?

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy

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?

The molar mass of cu is 63.55 g/mol. the number of grams of cu produced in this reaction is