UC知道化学题～高手帮帮忙～
来源：百度知道 编辑：UC知道 时间：2024/05/10 04:44:43
A solution is prepared by dissolving 0.5 mol sucrose in 10 moles of water The vapor pressure of water at 20degree is 17.5mmHg. which gives the change in vapor pressure of the liquid phase as the solute dissolves?
A)increase by 10.5 x 17.5mmHg
B)increase by (10.5/10)x17.5mmHg
C)increase by (10/0.5)x17.5mmHg
D)decrease by (0.5/10)x 17.5mmHg
E)decrease by (0.5/10.5)x17.5mmHG
答案写 E是正确的～请解释～谢谢
A)increase by 10.5 x 17.5mmHg
B)increase by (10.5/10)x17.5mmHg
C)increase by (10/0.5)x17.5mmHg
D)decrease by (0.5/10)x 17.5mmHg
E)decrease by (0.5/10.5)x17.5mmHG
答案写 E是正确的～请解释～谢谢
o my god!
是不是现在中学也要会专业英文?
先解释题:
0.5M的蔗糖溶解如10M的水中,水原本的的蒸汽压状态是20度时是17.5mmHg
问溶解后蒸汽压边成好多了
既然是溶解了溶质,当然蒸汽压会下降
而下降好多则根据公式:p=p1*n1/n
定义是:难挥发电解质稀溶液的蒸汽压等于纯溶剂的蒸汽压乘以溶剂在溶液中的摩尔分数
看来这个是大学里面的基础化学的东西没，兄台在哪里高就啊?
一条粉肠来混吉的
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