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n  2003Ä꿼ÑÐÌâ
n  Àý1£º
n   1mol He(g)´Ó273.15 K£¬101.325 kPaµÄʼ̬±äµ½298.15 K£¬ p2µÄÖÕ̬£¬¸Ã¹ý³ÌµÄìØ±ä¦¤S = -17.324 J¡ÁK-1£¬ÊÔÇóËãÖÕ̬µÄѹÁ¦p2¡£ÒÑÖªHe(g)µÄCV, m=R¡£

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n  ÒòΪ ¦¤S = n R ln(p1/p2) + n Cp,m ln(T2/T1)
n  ËùÒÔ
n  p2= p1exp{[(CV,m+R)/R]ln(T2/T1)-¦¤S/nR}
n   = 101.325 kPa¡Áexp{ln(298.15 K/273.15 K)      
n    -(-17.324 J¡¤K-1)/(1 mol¡Á8.314 J¡¤K-1¡¤mol-1)}   
n   = 1.013¡Á103 kPa
         
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n   ¹¯ÔÚÈÛµã(234.28 K)ʱµÄÈÛ»¯ÈÈΪ2.367 kJ¡¤mol-1,ÈôÒºÌ幯ºÍ¹ýÀäÒºÌ幯µÄĦ¶û¶¨Ñ¹ÈÈÈݾùµÈÓÚ28.28 J¡¤K-1¡¤mol-1,¼ÆËã1mol 223.15 KµÄÒºÌ幯ÔÚ¾øÈȵÈѹÇé¿öÏÂÎö³ö¹ÌÌ幯ʱÌåϵµÄìØ±äΪÈô¸É?

n  ½â£º
n  Éè223.15 KµÄÒºÌ幯ÔÚ¾øÈÈÇé¿öÏÂÎö³ö¹ÌÌ幯µÄÎïÖʵÄÁ¿Îªn,Éè¼Æ¹ý³ÌÈçÏÂ:

n  ¦¤H1= Cp(l)¡Á¦¤T            
n     = 1 mol¡Á28.28 J¡¤K-1¡¤mol-1¡Á(234.28-223.15) K      
n     = 314.8 J            
n  ¦¤H2= -n¦¤fusHm= -n(2.367¡Á103 J¡¤mol-1)      
n     = -2.367¡Á103n J¡¤mol-1
n  ÒòΪ ¦¤H=¦¤H1+¦¤H2= 0            
n  ËùÒÔ 314.8J+(-2.367¡Á103n J¡¤mol-1)=0        
n      n = 0.1330 mol            
n  ¦¤S =¦¤S1+¦¤S2= Cpln(T2/T1)+¦¤H2/T2      
n    = 1 mol¡Á28.28 J¡¤K-1¡¤mol-1¡Áln(234.28 K/223.15 K)     
n      +(-0.1330 mol¡Á2.367¡Á103 J¡¤mol-1)/234.28 K      
n    = 3.28¡Á10-2 J¡¤K-1


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n  U = RT2(lnq/T)V            
n  (lnq/T)V = (lnqt/T) V + (lnqr/T)V + (lnqv/T)V
= [(3/2T) + (1/T) + (1/2)hn/(kT2)+ hn/(kT2)] / [exp(hn/kT)-1]
n  ËùÒÔ
n    U = (5/2)RT + (1/2)Lhn + Lhn/[exp(hn/kT)-1]  
n    CV = (U/T)V = 25.88 J¡¤K-1¡¤mol-1
      
n  Àý2.
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n  CV,m(£ö)=(UV,m/T)V,N =R(Qv/T)2exp(Qv/T) / [exp(Qv/T)-1]2
n  ÓÉÓÚÁ½ÕßQv²»Í¬,¹Ê²»¿ÉÄÜÔÚijһ¸öTÓÐÏàͬµÄCV,m(£ö)¡£µ«µ± T® ¥, exp(Qv/T)¡Ö1 +Qv/ T ʱ, CV,m(£ö) ® R , ¼´Î¶ȺܸßʱÁ½ÕßÓÐÏàͬµÄ



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n  ¼´ (d¦¤mixG/dx1)T,p = RT [ 1 + lnx1- 1 - ln(1-x1)]   
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(1) ÄܶÀÁ¢´æÔڵĻ¯Ñ§·´Ó¦ÓÐÁ½¸ö£º           
n    ZnO(s) + C (s) = Zn(g) + CO(g)           
n    2CO (g) = CO2 (g) + C (s)            
n  Ñ¹Á¦¹ØÏµÎª£º               
n    p(Zn) = p(CO) + 2p(CO2)
(2) f = C+ 2 -¦µ              
  n   = 2 + 2 - 3 = 1
  ( C= »¯ºÏÎïÊý - ÔªËØÊý = 5 - 3 = 2 )
(3) ¶ÀÁ¢±äÁ¿¿ÉÒÔÊÇζȣ¬Ò²¿ÉÒÔÊÇѹÁ¦¡£

n  Àý2
n  Ò»¸öƽºâÌåϵÈçͼËùʾ£¬ÆäÖаë͸Ĥ aa¡¯ Ö»ÄÜÔÊÐí O2(g)ͨ¹ý£¬bb¡¯ ¼È²»ÔÊÐíO2(g)¡¢N2(g) ͨ¹ý£¬Ò²²»ÔÊÐíH2O(g) ͨ¹ý¡£
n  [´ð]
n  (1) C = 6 - 1 = 5
n  (2) ¹²ÓÐÁùÏà Ca(s) , CaO(s) , O2(g) £¬H2O (l)         
   O2(g) + HCl(g) »ìºÏÆø , H2O(g) + N2(g) »ìºÏÆø , (3) »¯Ñ§Æ½ºâ Ca(s) + (1/2) O2(g) = CaO(s)        
n   ÏàÆ½ºâ  H2O(l) = H2O(g)           
n   Å¨¶È   p(O2),×ó= p(O2),ÓÒø©
n   Î¶Ƞ £Ô1=£Ô2=£Ô3=£Ô         
n  (4) f = C ¨C¦µ + 4 = 5 - 6 + 4 = 3

[ Last edited by wangyouhe on 2006-3-26 at 00:36 ]
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