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)

If 10–4 dm3 of water is introduced into a 1.0 dm3 flask

1.	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)
A.	1.27 × 10–3 mol
B.	5.56 × 10–3 mol
C.	1.53 × 10–2 mol
D.	4.46 × 10–2 mol
Answer» B. 5.56 × 10–3 mol