发布时间 : 星期日 文章化工热力学第二章复习题更新完毕开始阅读453f9426af45b307e871975a
h?bB? (2-25) 联立迭代得Z值,再用PV=ZRT求得V。 VZ
方法二:已知R-K方程为
p?RTa (1) ?0.5V?bTV(V?b)将式1)方程两边乘以 (V?b)P
RTa(V?b) V?b??PPT1/2V?V?b?
将上式写成迭代格式 a?Vk?b?RTV??b? k?1PPT1/2Vk?Vk?b?
R2Tc2.5(8.314)2?(190.6)2.560.5?2 a?0.42748?0.42748??3222kP?m?K?kmola3pc4.6?10b?0.08686 Vk?1?RTc8.314?190.6?0.08664??0.02985m6?kmol?1 3pc4.6?10
0.1854?Vk?0.02985?V?2.4453? k?1Vk?Vk?0.02985?
取 V?RT?8.314?294.3?2.4154m3?kmol?10P1013
0.1854?2.4154?0.02985?
V1?2.4453??2.3704m3?kmol?1 2.4154?2.4154?0.02985? 0.1854?2.3704?0.02985?V?2.3690m3?kmol?1 2?2.4453? ?2.4453?V3
3222?Vk?0.02985?8.314?294.3?0.02985?10131013?294.31/2?Vk?Vk?0.02985?0.1854?2.3690?0.02985??2.3690m3?kmol?1?2.3690?0.02985? 2.3690
V?2.3690m3?kmol?13
2.3704?2.3704?0.02985?则在T=294.3K和p=1.013?10kPa时摩尔体积的计算值与实验值的相对百分偏差为
2370.27?2369?100%?0.0542370.27 7