题目内容
如图所示,一定质量的理想气体,从状态A经状态B、C、D又回到A。已知气体在状态A时的体积为1L,温度为150K,压强为1atm;B状态的温度为450K; C、D状态的温度均为900K。求: B、C、D三状态时气体的体积,并在P—V图中画出气体状态变化过程。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241300059584688.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241300059584688.png)
解: A到B,发生的是等容变化,
(2分)
B到C,发生的是等压变化,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006005482.png)
根据
,得到
(2分)
C到D,发生的是等温变化,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006067484.png)
根据
,得到
根据
,得到
(2分)
画图 (4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241300062233541.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130005989613.png)
B到C,发生的是等压变化,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006005482.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006020683.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006052544.png)
C到D,发生的是等温变化,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006067484.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006098654.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006114650.png)
根据
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006161644.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130006192542.png)
画图 (4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241300062233541.png)
略
![](http://thumb2018.1010pic.com/images/loading.gif)
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