问答题
An aqueous solution of urea(尿素)had a freezing point of -0.52℃. Predict the osmotic pressure of the same solution at 37℃. Assume that the molar concentration and the molality(质量摩尔浓度b)are numerically equal.
【正确答案】
凝固点降低
△T
f
=T
f
*
-T
f
=K
f
b
B
代入0.52=1.86b
B
b
B
=0.28mol·kg
-1
；
代入渗透压的范特霍夫公式∏=cRT，其中c=b
B
得出∏=0.28×8.314×310.15=722(kPa)
【答案解析】
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