Abox contains a mixture of small copper spheres and small lead spheres. the total volume of both metals is measured by the displacement of water to be 435 cm^3 and the total mass is 4.30 kg. what percent of the total volume of the spheres is copper?

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?