94 ANSWEB8 TO PRACTICAL QUESTIONS 



8. How much N 2 O can be made from i Ib. of ammonium 

 nitrate ? 



N 8 O : H 4 N,NO 3 : : x : i Ib. 



44 : 80 : : x : i Ib. 



80 x = 44 Ibs. 



x = ii Ib. (N 2 0). 



9. ^?a/ #zz/^ //r*f #V/ <:# be formed from 50 /&r. of 

 sodium nitrate (NaNO 3 ) 1 



Find (i) how much N there is in 50 Ibs. of sodium 

 nitrate (Chili saltpetre), and (2) how much HNO 3 could 

 be made from that amount of N. 



(1) N : NaN0 3 : : x : 50 Ibs. 

 14 : 85 : : x : 50 Ibs. 



85 x 700 Ibs. 

 x = 8 r V Ibs. (N). 



(2) N : HNO. : : 8fy Ibs. : x. 

 14 : 63 : : 8 T V Ibs. : x. 



14 x = 518,4 Ibs. 



x = 37T y Ibs. (HN0 3 ). 



10. What causes flesh to decompose so much more easily 

 than wood ? 



It is partly owing to the greater complexity of its mole- 

 cule, and partly to the presence of the fickle N. 



11. If a tuft of hair be heated in a test tube, the liquid 

 formed will turn red litmus-paper blue. Explain. 



Ammonia is formed by the decomposition of the hair, 

 and this acting on the red litmus-paper turns it blue. 



12. Why should care be used in opening a bottle of strong 

 H 3 N in a warm room ? 



The volatile gas sometimes drives out the liquor am- 

 moniae with great force. 



