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If \( 10^{-4} \mathrm{dm}^{3} \) of water is introduced into a \( 1 \mathrm{dm}^{3} \)
\( \mathrm{P} \) flask at \( 300 \mathrm{~K} \), how many moles of water are in

W the vapour phase when equilibrium is established (Given vapour pressure of \( \mathrm{H}_{2} \mathrm{O} \) at \( 300 \mathrm{~K} \) is 3170 Pa; \( \mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} \) )
(1) \( 5.56 \times 10^{-6} \mathrm{~mol} \)
(2) \( 1.53 \times 10^{-2} \mathrm{~mol} \)
(3) \( 4.46 \times 10^{-2} \mathrm{~mol} \)
(4) \( 1.27 \times 10^{-3} \mathrm{~mol} \)
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