Give reasons for the following in one or two sentences.
(i) Equal volumes of gases contain equal number of moles.
(ii) A bottle of liquid ammonia should be cooled before opening the stopper.

Answer

(Sujective)

Explanation

(i) According to Avogadro’s hypothesis, “Under identical conditions of pressure and temperature, equal volume of ideal gases contains equal number of molecules.”
(ii) `NH_(3)` (l) is highly volatile, a closed bottle of `NH_(3)` (l) contains large number of molecules in vapor phase maintaining high pressure inside the bottle. When the bottle is opened, there is chances of bumping of stopper. To avoid bumping, bottle should be cooled that lowers the pressure inside.