The Henry's law constant for O_2 in water at 25 degree C is 1.66 times 10^6 M/mm Hg. What partial pressure of O_2 is necessary to achieve an equilibrium concentration of 0.200 M O_2? a) 3.32 times 10^-7 mm Hg b) 1.65 times 10^3 mm Hg c) 1.20 times 10^5 mm Hg d) 3.01 times 10^6 mm Hg e) 8.30 times 10^6 mm Hg Answer e. The mole fraction of water in 80 proof alcohol is 0.79. If the vapor pressure of pure water at 25 degree C is 23.8 mm Hg, what is the partial pressure of water in 80 proof alcohol? Assume ideal behavior for the solution. a) 0.63 mm Hg b) 19 mm Hg c) 29 mm Hg d) 51 mm Hg e) 71 mm Hg Answer ; b What is the freezing point of a solution containing 5.663 grams naphthalene molar mass = 128.2 g/mol dissolved in 32.0 grams paradichlorobenze? the freezing point of pure paradichlorobenze is 53.0 degree C and the freezing point depression constant, K_fp, is + 7.10 degree C/m. a) 43.2 degree C b. 47.0 degree C c) 1.7 degree C d) 53.0 degree C e) 69.1 degree C