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If $10_{−4}dm_{3}$ of water in introduced into a 1,0 $dm_{3}$ flask to 300 K, how many moles of water are in the vapour phase when equilibrium is establised ? (Given : Vapour pressure of $H_{2}O$ at 300 K is 3170 Pa : R = $8.314J K_{−1}mol_{−1}$)

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