States of Matter - Result Question 87
87. Give reasons for the following in one or two sentences.
(i) Equal volumes of gases contain equal number of moles.
(1984, 1M)
(ii) A bottle of ammonium hydroxide should be cooled before opening the stopper.
(1983, 1M)
Show Answer
Solution: 87.
(i) $\mathrm{NH}_3(l)$ is highly volatile, a closed bottle of $\mathrm{NH}_3(l)$ contains a large number of molecules in vapour phase maintaining high pressure inside the bottle. When the bottle is opened, there is a chance of bumping of stopper. To avoid bumping, bottle should be cooled that lowers the pressure inside.
(ii) According to Avogadro’s hypothesis, “Under identical conditions of pressure and temperature, equal volume of ideal gases contain equal number of molecules.”
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