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  4. At 40° C , the vapour pressures in torr, of methyl alcohol and ethyl alcohol solutions is represented by the equation P=119XA+135 where XA is mole fraction of methyl alcohol, then the value of undersetxA arrow 1lim(PA/XA) is

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Q. At $40^\circ C$ , the vapour pressures in torr, of methyl alcohol and ethyl alcohol solutions is represented by the equation $P=119X_{A}+135$ where $X_{A}$ is mole fraction of methyl alcohol, then the value of $\underset{x_{A} \rightarrow 1}{lim}\frac{P_{A}}{X_{A}}$ is

NTA AbhyasNTA Abhyas 2020

Solution:

$P=119X_{A}+135$
$\underset{x_{A} \rightarrow 1}{lim}\frac{P_{A}}{X_{A}}=119+135=254$ torr (Put $X_{A}=1$ )