60 ANSWERS TO PRACTICAL QUESTIONS 



30. How much CO 9 is formed in the combustion of I ton 



of C? 



C : C0 3 : : 2000 Ibs. : x. 

 C : 22 : : 2000 Ibs. : x. 

 x = 7333 Vs Ibs. (CO a ). 



31. What weight of S is there in a ton of iron pyrites f 



2S : FeS 3 : : x : 2000 Iba. 

 32 : 60 : : x : 2000 Ibs. 



32. What weight of copperas could be made from 500 Ibs. 

 of iron pyrites ? 



In forming FeO.SO, from FeS a only one atom of S is re- 

 quired ; hence the 500 Ibs. of iron pyrites really contain but 

 366 Vs Ibs. of FeS, which will, at a single reaction, form cop- 

 peras ; by oxydation from the air, the remaining atom of S 

 would doubtless be used afterward. The problem might be 

 solved as well, perhaps, by taking either the Fe or the S alone 

 as the constituent. 



FeS : (FeO.S0 8 +7HO) :: 366 a /s Ibs. (FeS) : x. 



44 : 139 :: 366 2 / 3 Ibs. : x. 

 35=1158.3 Ibs. (FeO.SO 3 + 7HO). 



33. What weight of H is there in a pound of heavy car* 



buretted hydrogen ? 



4H : C 4 H< : : x : 1 lb. 



4 : 28 : : x : : 1 lb. 



a: = V7lb. (H). 



34. How miich O would be required to oxydize the metallic 

 opper which could be reduced from its oxyd by passing over 

 it, when white-hot, 20 grs. of H gas? 



The same amount of O would be required to oxydize the 

 copper that was taken from it when it was reduced from its 

 oxyd. The H passing over it when white-hot takes out its O 

 and forms HO. H is always of the HO. The H = 20 grs.; 

 hence the HO =9 times 20 grs. = 180 grs. 180 grs. (HO) 

 20 grs. (H) = 1 60 grs. (O). 



35. How much O would be required to oxydize the metallic 

 iron which could be reduced in the same manner by 10 grs. of 

 H %as ? 



