Densitatea în condiții normale a unui gaz care nu arde dar intretine arderea, este de 1,428 g/dm3. Indica masa molara a gazului . * REPEDE VA ROG

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?