80 ANSWERS TO PRACTICAL QUESTIONS 



CO 3 : CaCO 3 : : x : 200 Ibs. 

 44 : 100 : : x : 200 Ibs. 

 100 x = 8,800 Ibs. 

 x = 88 Ibs. (CO S ). 



?./. What iveight of CO 2 in a ton of marble ? 



CO 2 : CaCO 3 : : x : 2,000 Ibs. 

 44 : 100 : : x : 2,000 Ibs. 

 100 x = 88,000 Ibs. 



x = 880 Ibs. (CO 3 ). 



32. Why does not a cold saucer held over an alcohol 

 flame blacken, as it does over a candle or gas-light ? 



There is less C in alcohol than in tallow or in coal-gas. 



33. How much CO 2 is formed in the combustion of one 

 ton of C? 



C : CO 2 : : 2,000 Ibs. : x. 



12 : 44 : : 2,000 Ibs. : x. 

 12 x = 88,000 Ibs. 



x = 7333.33 + lbs. (CO 3 ). 



34. IWiat weight of Cis there in a ton of CO 2 ? 



C : CO 2 : : x : 2,000 Ibs. 



12 : 44 : : x : 2,000 Ibs. 



44 x = 24,000 Ibs. 



x = 545.45 + Ibs. (C). 



35. Sow much O is consumed in burning a ton of C? 



In any quantity of CO 2 , T \ of the compound is O, and J S T 

 C. If T 3 T = 2,000 Ibs. (COo), then T 8 T = | of 2,000 Ibs. = 5333.33 

 + lbs. (O). 



36. IVliat weight of sodium carbonate (Na 2 CO 3 , 1O 

 H S O, " carbonate of soda") would be required to evolve 12 

 grams of CO 2 ? 



CO 2 : Na 2 CO 3 10ELO : : 12 gm. : x. 

 44 : 286 : : 12 gm. : x. 



44 x = 2,432 gm. 



x = 50.72 gm. (Na 2 C0 3 , 10H S O). 



