Verified Solution • 2025–26 Session moderate

QJEEM10Chf040: JEE Main 2010 Chemistry - Class 11 JEEM10Chf040 Solution: If 10 –4 dm 3 of water is introduced into a 1.0 dm 3 flask to…

If 10–4 dm3 of water is introduced into a 1.0 dm3 flask to 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 = 8.314 J K–1 mol–1)

Multiple Choice Options

  • A 5.56 x 10–3 mol
  • B 1.53 x 10–2 mol
  • C 4.46 x 10–2 mol
  • D 1.27 x 10–3 mol

Step-by-Step Verified Solution

From the ideal gas equation :

PV=nRT

or n=PVRT=3170×10−38.314×300

=1.27×10−3

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