58 ANSWERS TO PRACTICAL QUESTIONS 



C : C0 a : : 2000 lbs. : x. 



6:2-2:: 2000 Ibs. : x 



X = 7333 V 3 lbs. (CO a ). 



7333 1 / s 2000 lbs. = 5333 Vs lbs - (O) 



More simply: 



C : 2O : : 2000 lbs. : a:. 



19. In burning a charge of 10 /&?. #/" gunpowder, find thi 

 weight of the several products formed. 



(See page 107.) (1.) KS: (KO.NO 3 + S+3C) :: x : 10 Ibs. 

 55 : 135 : : x : 10 lbs. 

 a; = 4 VST H. (KS). 



(2.) N : (KO.NO 6 + S+3C) :: x : 10 llw. 

 14 : 135 : : x : 10 lbs. 



x = 1 VST Ibs. (N). 



(3.) 3C0 3 : (KO.N0 6 + S+3C) : : x : 10 lbs. 

 66 : 135 : : x : 10 lbs. 



* 20. Ff%zl weight of common salt would be required to fonn 

 25 /fo. of muriatic acid (HCl ) ? 



Cl : HCl : : a; : 25 lbs. 

 35.5 : 36.5 : : x : 25 Ibs. 



a; = 24.3 Ibs. (Cl). 

 Cl : NaCl : : 24.3 lbs. : x. 

 85.5 : 58.5 : : 24.3 Ibs. : x. 

 x = 40.044 Ibs. (NaCl). 



21. HCl of a specific gravity 0/1.2 contains about 40 per 

 cent, of the acid. This is very strong commercial acid. What 

 weight of this acid could be formed by the HCl acid gas pro- 

 duced in the reaction named in the preceding problem ? 



If 25 lbs. = 40 per cent., then 100 per cent. = 2.5 times 25 lbs. = 62 >/s lbs - 



22. What weight of hydriodic acid (HI) is formed from 

 a drachm of iodine ? 



I : HI : : 1 dr. : x. 

 126.8 : 128.8 : : 1 dr. : a. 

 . (Hi). 



