IN CHEMISTRY. 57 



K : KO : : 1 dr. : x. 



39 : 47 : : 1 dr. : x. 

 x = Igg drs. (KO). 



1^% drs. 1 dr. = fy dr., the amount of O. 

 The HO is 9 /e of 8 / 3 dr. = Vis dr. (HO). 9 



12. What weight of nitrous oxyd will be formed from the 

 decomposition of 6 oz. of nitrate of ammonia ? 



2 NO : NH 4 O.N0 6 : : x : 6 oz. 

 aj = 3 8 /j oz. (NO). 



13. How much sal-ammoniac would be required to make 2 

 Ibs. of NH^ ? 



NH, : NH 4 C1 : : 2 Ibs. : x. 



17 : 53.5 : : 2 Ibs. : x. 

 jc = 6Vi7 Ibs. (sal-ammoniac). 



14. How much CO* will be formed in the combustion of 30 

 grs. of CO f 



CO : C0 a : : 30 grs. : x. 

 14 : 22 : : 30 grs. : x. 

 a = 47V 7 grs.(CO a ). 



15. What weight of carbonate of soda (sal-soda) would be 

 required to evolve 12 Ibs. of CO^f 



CO, : NaO.COa : : 12 Ibs. : x. 



22 : 53 : : 12 Ibs. : x. 

 X = 28 'Vii Ibs. (NaO.CO,). 



1 6. What weight of bicarbonate of soda (Na 

 "soda") would evolve 12 Ibs. of CO 9 ? 



2CO a : Na0.2CO 3 : : 12 Ibs. : x. 



44 : 75 : : 12 Ibs. : x. 

 x = 20 Vu Ibs. (" soda"). 



17. What weight of C is there in a ton of CO 9 f 



G : CO 3 : : x : 2000 Ibs. 

 6 : 22 : : x : 2000 Ibs. 

 =545Vii Ibs. (C). 



1 8. How much O is consumed in burning a ton of C? 



3* 



