IN CHEMISTRY. 55 



8. In a 25 Ib. sack of salt (NaCl) how many Ibs. of the 

 metal sodium ? 



Na = 23 = equivalent of the constituent. 

 NaCl = 58.5=. " " compound. 



x = weight of the constituent. 

 25 Ibs. = " " compound. 

 23 : 58.5 : : x : 25 Ibs. 

 a; = 9-^- Ibs. (Na). 



229. 5. What weight of O is contained in 60 grs. of 

 KO.CIOJ 



,O = 48 = equivalent of constituent. 

 KO.C10 6 = 122V a = " " compound. 



x = weight of constituent. 

 60 grs. = " " compound. 

 48 : 122V 3 : : x : 60 grs. 

 X = 23 |f grs.(O). 



6. How much KCl will be formed in preparing 80 grs. of Of 

 First find how much KO.C1O 6 will be required to make 80 



grs. f O, and then subtract the 80 grs. of O from the amount, 

 and the remainder will be the KCl. The constituent and 

 compound are the same as in the last problem. 



48 : 122 /a : : 80 grs. : x 



x = 204.16 grs. 

 204.16 grs. 80 grs. = 124.16 grs. (KCl). 



7. How much H can be made from 10 Ibs. of Zn f 



First find how much ZnO 10 Ibs. of Zn will form ; second, 

 subtract the 10 Ibs. of Zn, and the remainder is the O which 

 came from the water. This O formed f of the water, and 

 the remaining is the H set free. 



Zn = 32.5 = equivalent of the constituent. 

 ZnO = 40.5 = " " compound. 



10 Ibs. = weight of the constituent. 

 x= " " compound. 



35.5 : 40.5 : : 10 Ibs. : x. 



OS ~ 12.461 Ibs. (ZnO). 12.461 Ibs. ZnO 10 Ibs. Zn = 2.461 'bs. (O). 

 2.461 Ibs. H- 8 = .307 Ibs. (H). 



8. How much H can be made from 50 Ibs. of water? 



