BERTHELOT*S CALORIMETER. 55 



COMBUSTION. 



5th minute 18.500' 



6th " 18.782 



7th minute 18.820' 



8th " 18.818 



SUBSEQUENT PERIOD. 



9th minute 18.810' 



loth " 18.802 



nth " 18.795 



I2th minute 18.785' 



I3th " 18.775 



I4th " 18.768 



Initial cooling per minute, 



dt. = 0.00. 

 Final cooling per minute, 



Atn + 0.008. 

 Correction for cooling, 



At + 0.056. 

 Variation of temperature, uncorrected, 



18.818- 17.360 = 1.438. 

 Value of corrected temperature, 



1.438 + 0.056= 1.484. 

 Value in water of the calorimeter (including oxygen), 



m = 2398.4. 

 Weight of acid formed ; 

 HNO S = 5 cc. of -fa normal KHO = 0.0173 gram. 



