CHEMICAL THEORY OF SOLUTIONS. PART T. 49 



is based on the data given in his second table. The temperatures 

 have been corrected for a pressure of 760 m.m. This could be 

 done without difficulty because the differences do not exceed 

 6 m.m. The compositions of the mixtures corresponding to the 

 boiling points have been calculated by means of equation (11) 



3) ' ^- 





where Q is the molar fraction of paraldehyde as before, and T^. 

 and Tß are the boiling points of the two chemical species. For 

 h the approximate value, 11, has been used. In the following 

 table the results of calculation are compared with observed values. 



Up to the molar fraction 0.7 the agreement between the 

 values observed and calculated is tolerably good. That the 

 differences for larger values of Cp are so great is doubtless due 

 to the fact that a comparatively large amount of acetaldehyde 



