思考题和习题解答 解:△T,=K,bn=K,-mB=K K B. =5.12 0.238 2.50×10-30.430 =126g.mol 17.蔗糖水溶液中蔗糖的摩尔分数xB为0.1016,0℃时此溶液中 H2O的偏摩尔体积为1772cm3·mol-,求其滲透压。实验值为 13.65 MPa RT ∫83145×2732 1772×106 [-ln(1-01016小}Pa =1373×10°Pa=13.73MPa·92· 思考题和习题解答 解： A B B f A A B f f B f / m m M K n M n ΔT = K b = K = 1 1 3 A f B B f 126 g mol g mol 0.430 1 22.50 10 0.238 5.12 1 − − − = ⋅ ⎟ ⋅ ⎠ ⎞ ⎜ ⎝ ⎛ × × = × Δ = ⋅ ⋅ m T m M K 17. 蔗糖水溶液中蔗糖的摩尔分数 xB 为 0.1016，0℃时此溶液中 H2O 的偏摩尔体积VA 为 17 72 1 . cm mol 3 ⋅ − ，求其渗透压。实验值为 13 65 . MPa 。 解：Π = −− = [ ] ( ) [ ] × × ×− − ⎧ ⎨ ⎩ ⎫ ⎬ ⎭ × − RT V x A B 6 ln ln Pa = 13.73 10 Pa = 13.73 MPa 1 8 3145 273 2 17 72 10 6 1 01016 . . . (.)