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Q.

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

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a

5.56×10−3mol

b

5.53×10−2mol

c

4.46×10−2mol

d

1.27×10−3mol

answer is D.

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Detailed Solution

n=PVRT      =3170×10−5atm×1L0.0821 Latm k−1mol−1×300K      =1.27×10−3mol
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