the vapor pressure of water at 25 C is 27.66 torr. is 0.5 g water is enclosed in a 1.5 L sealed container, will there be nay liquid. If yes, what mass?

Answer 1

I think you meant to type "If" instead of "is" at the start of your second sentence. I assume that the temperature of the container is 25 C.
27.66 torr = 27.66/760 = 0.036 atm
1 mole occupies 24.45 l at 25

The maximum amount of water that can be in gas phase at that temperature is
(number of moles of vapor)*(molar mass)
=(27.66/760)*(1.5/24.45)*18 g/mole
= 0.04 g
That leaves 4.96 g in liquid phase