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The vapour pressure of a mixture for liquid-liquid system is given by \( P_{M}=P_{A}^{0} \cdot X_{A}+P_{B}^{0} \cdot X_{B} \) whereas for solid-liquid system vapour pressure of solution \( P_{S} \) is given by \( P_{S}=P^{0} \times \) mole fraction of solvent. The vapour pressure of ethanol \( + \) water system is given by The vapour pressure of pure \( \mathrm{H}_{2} \mathrm{O} \) is :
(A) \( 32.80 \mathrm{~mm} \)
(B) \( 40 \mathrm{~mm} \)
(C) \( 11.20 \mathrm{~mm} \)
(D) none of these
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