The concentration of ethyl alcohol in a typical molecular cloud is one molecule per 108 cubic meters. What is the volume of a cloud you would need to make a martini (10 grams)? The molecular weight of a ethyl alcohol is 46 which means that an Avogadro number (6 x 1023) of molecules weighs 46 grams.

What pressure will be exerted by 0.675 moles of a gas at 25*c if it is in a 0.750-l container?

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?

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?