(a) What is the difference between gas and vapour? (b) Analyse the va

1.	(a) What is the difference between gas and vapour? (b) Analyse the vapour pressure vs temperature curve shown below:Arrange the compounds shown in the graph in the decreasing order of their normal boiling points,(c) The density of a gas was found to be 2.92 g L1 at 27 °C and 2.0 atm. Calculate the molar mass of the gas.
Answer» (a) A gas below its critical temperature can be liquified by applying pressure. Under these conditions, it is called vapour of the substance. (b) water > ethyl alcohol > carbon tetrachloride > diethyl ether (c) M = \(\frac{dRT}{p}\) \(\frac{2.92\,gL^{-1}\times\,0.0821L\,atm\,K^{-1}\,mol^{-1}\times 300\,K}{2\,atm}\) = ^-136g mol

(a) What is the difference between gas and vapour? (b) Analyse the vapour pressure vs temperature curve shown below:Arrange the compounds shown in the graph in the decreasing order of their normal boiling points,(c) The density of a gas was found to be 2.92 g L1 at 27 °C and 2.0 atm. Calculate the molar mass of the gas.

Answer»

(a) A gas below its critical temperature can be liquified by applying pressure. Under these conditions, it is called vapour of the substance.

(b) water > ethyl alcohol > carbon tetrachloride > diethyl ether

\(\frac{2.92\,gL^{-1}\times\,0.0821L\,atm\,K^{-1}\,mol^{-1}\times 300\,K}{2\,atm}\)

= ^-136g mol

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