作者miyo23 (miyo)
看板Physics
标题Re: [题目] 热物理/热力学 两题问题
时间Fri Nov 12 22:09:40 2010
以下是我粗略查一下热力学课本的结果.
第一题的解法请参考.
Mark W. Zemansky
Richard H. Dittman
Heat and Thermodynamics (7 edition) P232~233
: 1:Calculate the critical temperature of helium if the critical pressure
: is 2.26atm and density is 0.069g/立方公分
in critial point
(dP/dV)=0 and (d^2P/dV^2)=0
非理想气体时: P = RT / (v-b) - a / v^2 其中, v=V/n = molar volume
代入上述二式
(dP / dv) = -RT/(v-b)^2 + 2a/ v^3 = 0
(d^2P / dv^2) = 2RT / (v-b)^3 - 6a / v^4 = 0
整理一下可得
2a / v^3 = RT / (v-b)^2
3a / v^4 = RT / (v-b)^3 由这二式解Tc
可得
vc = 3b, Tc = 8a/27bR, Pc = a/27b^2
最後利用老师给的密度, 再查一下He的原子量,
我想应该可以得到vc, 而算出你要的Tc.
: 2:1kg of water is boiled under a pressure of 2atm at 393k,if the volume
: occupied by water and steam under given condition are respectively
: 0.001立方公尺 and 0.824立方公尺,calculate workdone and the increase
: in internal energy.L=2.20*10J kg(-1次方)
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 118.169.76.12