People have died over drinking big amounts of water in fraternity initiations and while they where having the radio contest. So no there it's no life after hydration
PV = nRT
P is pressure, V is volume, n is number of moles, R is the gas constant, T is temperature in K
(2.85 atm)(12.5 L) = (n)(.08206)(27 C + 273)
n = 1.45 moles x 35.45 grams / mol Cl2 = 51.3 grams
Is a solid? has strong intermolecular forces?