States of Matter

States of Matter

Question

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

  • 5.56 x 10-3 mol

  • 1.53 x 10-2 mol

  • 4.46 x 10-2 mol

  • 1.27 x 10-3 mol

Answer

D.

1.27 x 10-3 mol

The volume occupied by water molecules in vapour phase is (1-10-4) dm3, that is approximately (1 x 10-3)m3
pvapV = nH2O (mol)
3170 (pa) x 1 x 10-3 (m3) - nH2O(mol) x 8.314 (JK-1 mol-1) x 300K

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