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在298K和大气压力下,甲醇(B)的摩尔分数xB为0.30的水溶液中,水(
A.和甲醇(
B.的偏摩尔体积分别为V(H2O)=17.765cm3·mol-1,V(CH3OH)=38.632cm3·mol-1。已知在该条件下,甲醇和水的摩尔体积分别为Vm(CH3OH)=40.722cm3·mol-1,Vm(H2O)=18.068cm3·mol-1。现在需要配制上述水溶液1000cm3,试求:(1)需要纯水和纯甲醇的体积;(2)混合前后体积的变化。
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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