The vapor pressure of pure water at 85 degree C is 434 torr. What is the vapor p
ID: 531734 • Letter: T
Question
The vapor pressure of pure water at 85 degree C is 434 torr. What is the vapor pressure at 85 degree C of a solution prepared from 100 mL of water (density 1.00 g/mL) and 150 g of diglyme, C_6H_14O_3, a nonvolatile substance? a) 361 torr b) 390 torr c) 425 torr d) 388 torr e) none of the above Calculate the molality of a 1.52 M sugar (C_12H_22O_11) solution with a density of 1.12 g/mL. a) 1.74 m b) 1.52 m c) 1.36 m d) 2.53 m e) none of the above A 0.86% m/m solution of NaCl is called "physiological saline" because its osmotic pressure is equal to that of the solution in blood cells. Calculate the osmotic pressure of this solution at normal body temperature (37 degree C). Note that the density of the saline solution is 1.005 g/mL, and use the theoretical value of the Van't Hoff Factor for NaCl. a) 7.5 atm b) 3.7 atm c) 1.5 atm d) 4.7 atm e) none of the above Given the reaction 2X(g) + Y(g) doubleheadarrow 2Z(g) Delta H = -335 kJ which combination of pressure and temperature gives the highest yield of Z at equilibrium? a) 1000 atm and 500 degree C b) 1000 atm and 100 degree C c) 500 atm and 500 degree C d) 500 atm and 100 degree C e) none of the above Use molecular orbital theory to determine the bond order for the O_2^+ ion. a) 1 b) 1.5 c) 2 d) 2.5 e) none of the above K_c for the reaction, CH_4(g) + H_2O(g) CO(g) + 3H_2(g) at 1500 degree C is 5.67. What is K_c for the reaction CO(g) + 3H_2(g) CH_4(g) + H_2O(g)? a) 11.3 b) 2.84 c) 0.00325 d) 0.176 e) none of the above Chromium crystallizes in a body-centered cut structure. The unit cell volume is 2.583 times 10 cm^3. Determine the atomic radius of Cr in pm. a) 1.28 times 10^-8 pm b) 128 pm c) 1.85 times 10^-8 pm d) 185 pm e) none of the aboveExplanation / Answer
Ans 1.a) 361 torr
150 g diglyme = 150/134.18 = 1.12 moles
100 ml of water = 100 g (density 1g/mL) = 100/18 = 5.55
mole fraction of water= 5.55/ (1.12 + 5.55) = 0.83
p = 0.83 x 434
p = 361 torr
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