ö. i = — 125^17, hence T= 147,92> m = 0,9819 , 3,424m — ^,^61 

 By means of linear interpolation ^; = 42,944 has been calculated, 



so B = 0,8947. 



As theoretically P ranges from 0,42 to 0,29 (see above), both the 

 values found can be correct. 



/;. ^ — ^131°,54 , r= 141,55. Hence ??^~ 0,9396, 3,4247?i = 



= 3,217. Linear interpolation, giving /?=: 33,545, s = 0,6989, v\^ould 

 be too uncertain here, as — 129°,8 differs too much from — 131°,5. 



Van der Waals' formula — ïoq^'^s=f~ — - gives with ƒ =2,444') 



1 — Vl 



the value b = 0,6964. 



As /5 ranges from 0,42 to 0,29, tiie /?-valuc in the vapour is too 

 small. 



c. f — — 135°,51 = 137,58 abs. Hence m = 0,9132 , 3,424 m=3,127. 



A linear interpolation gives /; = 28,344, ? = 0,5905 ; van der Waals' 

 formula with ƒ = 2,420 gives s = 0,5890. 



1) The values of f have in each case been calculated by me from the vapour- 

 pressure observations. 



30"^ 



