86 ANSWERS TO PRACTICAL QUESTIONS 



3. How much S is there in 2 Ibs. 0/SO 2 ? 



S = 32 = atomic weight of the given element. 

 SO a = 64 = molecular weight of the compound. 



x = weight of the given element. 

 2 Ibs. = " u compound. 



S : SO a : : x : 2 Ibs. 

 32 : 64 : : x : 2 Ibs. 

 644 = 64 Ibs. 

 x = i lb. (S). 



4. How much S is there in 2 Ibs. oj H 2 SO 4 ? 



S : H 2 SO : : x : 2 Ibs. 

 32 : 98 : : jr : 2 Ibs. 

 98 x = 64 Ibs. 

 JT = SJ lb. (S). 



5. .#bw w^ O is there in 5 Ibs. o/HNO 3 ? 



O 3 = 48 = atomic weight of the given element. 

 HNO 3 = 63 = molecular weight of the compound. 



x = weight of the given element. 

 S Ibs. = " " compound. 



O, : HNO 3 : : x : 5 Ibs. 

 48 : 63 : : x : 5 Ibs. 

 63 x = 240 Ibs. 

 x = 3 tf Ibs. (O). 



6. How much H is there in 6 Ibs. of HC1 ? 



H : HCl : : x : 6 Ibs. 



i : 36.5 : : JJT : 6 Ibs. 



36.5 x = 6 Ibs. 



* = A . = I! lb. (H). 



K 2 O tfw/;/ be made from 3 /Ar. ^/ K? 



K, : K a O : : 3 Ibs. : x. 



78 : 94 : : 3 Ibs. : x. 



78 x 282 Ibs. 



* = 3r 8 s Ibs. (K.O). 



40. I. Are all acids sour ? 



(See Chemistry, page 22, note, and also page xia) 



