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Q.

If 10−4dm3 of water is introduced into a 1.0dm3 flask at 300 K, how many moles of water are in the vapour phase when equilibrium is established? (Given: Vapour Pressure of H2O at 300 K is 3170 Pa;R=8.314JK−1mol−1)

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a

4.46×10−2 mol

b

1.27×10−3 mol

c

5.56×10−3 mol

d

1.53×102 mol

answer is B.

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Detailed Solution

n=PVRT=3170×18.314×103×300=1.27×10−3mol
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