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45. The vapour density of dibromamylene (C.H ̧Bг2) was determined by Meyer's third method. 0.12 gram gave 13.1 c.c. of air at 17°C. The barometer stood at 758 m.m., and the tension of aqueous vapour was 14.4 m.m.

density of the vapour.

Find the

46. A globe, the capacity of which was 178 c.c., when filled with air at 15° C. weighed 23.45 grams, and when filled with the vapour of a hydrocarbon at 110° C. weighed 23.72 grams. Find the density of the vapour.

47. Camphor vapour is 5.312 times as heavy as air, what is its double density referred to hydrogen?

48. Find the mass of 295 c.c. of camphor (C10H160) vapour at 210° C.

49. A globe, the volume of which was 810 c.c. when full of air at 14° C. weighed 119 grams, and when full of alcohol vapour at 100° C. weighed 119.2 grams. Find the density of the vapour.

50. A substance contains carbon 45 parts, hydrogen 7.5 parts, and oxygen 60 parts. Find its most simple

formula.

51. 0.25 gram of an organic substance gave when burnt 0-8103 gram of carbon dioxide and 0-2655 gram of water. Its vapour is 4.76 times heavier than air. Find its formula.

52. 0.243 gram of a substance, containing only carbon, hydrogen and oxygen, gave 0·693 gram of carbon dioxide and 0.162 gram of water. Find its simplest formula.

53. Find the formula of a substance containing carbon 26.66 per cent., oxygen 53.33 per cent., and water 20 per

cent.

54. A neutral substance was found to contain carbon 39.56 per cent., hydrogen 7.69 per cent., and oxygen 52.75 per cent. Find its formula.

55. 0-3807 gram of an organic acid carbon dioxide and 0.1698 gram of water.

gave 0.9575 gram of 0-4287 gram of the silver salt gave 0·202 gram of silver. Find the formula of the acid.

56. A body contains carbon 50-37 per cent., hydrogen 6-33 per cent., nitrogen 17.95 per cent., and oxygen 25.36 per cent. Find its formula.

57. A substance contains carbon 49-485 per cent., hydrogen 5-155 per cent., nitrogen 28-866 per cent., and oxygen 16.495 per cent. Find its formula.

58. A substance contains carbon 35-71 per cent., hydrogen 2.38 per cent., nitrogen 33.33 per cent., and oxygen 28.58 per cent. Find its formula.

59. 4-85 grams of an organic substance gave when burnt 6.95 grams of carbon dioxide and 0·95 gram of water. 5.46 grams of it gave 681 c.c. of nitrogen at 13° C. and 775 m.m. Calculate its percentage composition and formula.

60. A substance contains carbon 68-67 per cent., hydrogen 4.95 per cent., and oxygen 26-38 per cent., and its vapour is 4.226 times heavier than air. Find its formula.

61. A body contains carbon 19.04 per cent., hydrogen 4.76 per cent., sulphur 25-4 per cent., and oxygen 50.8 per cent. Find its formula.

62. A substance contains carbon 74-07 per cent., hydrogen 8-64 per cent., and nitrogen 17-29 per cent. Find its formula.

63. 0-4102 gram of a liquid gave when burnt with lead chromate 0-5119 gram of carbon dioxide, and 0.2286 gram of water. 0-3878 gram of it gave 0·3975 gram of silver iodide and 0.0148 gram of silver. Calculate its percentage composition and formula.

CHAPTER XI.

CHLORINE. Cl = 35.5.

1. WHAT volume is occupied by 177.5 grams of chlorine (CI)?

2. How much salt is required to make 28 litres of chlorine?

2NaCl + MnO, +2H,SO, 2H,O+Na,SO,+MnSO,+Cl,.

=

3. What volume of chlorine can be made from 2078 of salt?

grams

2NaCl + MnO2+2H2SO1 = 2H2O+Na2SO2+ MnSO2+Cl ̧.

4

4

4. How many grams of manganese dioxide are required

to make 40 litres of chlorine at 37° C. ?

MnO2+ 4HCl = 2H ̧O + MnCl ̧ + Cl ̧.

5. How much common salt must be used to make 150 c.c. of gaseous hydrogen chloride?

2NaCl + H2SO1 = Na2SO + 2HC1.

6. How many pounds of common salt are required to make 150 pounds of solution of hydrogen chloride containing 31.5 per cent. of real acid?

2NaCl + H ̧SO̟ ̧ = Na2SO ̧ + 2HCl.

7. What volume of chlorine at 39° C. is required to make 1000 grams of bleaching powder?

8. How many grams of hydrogen chloride can be obtained from 100 grams of salt?

2NaCl + H2SO1 = Na2SO + 2HCl.

4

9. How much salt is required to make 1000 grams of hydrogen chloride ?

2NaCl + H2SO1 = Na2SO1 + 2HC1.

4

4

10. 20 grams of dilute hydrogen chloride gave 4.53 grams of silver chloride, what is the percentage of real acid in the solution?

HCl + AgNO2 = HNO3 + AgCl.

11. What volume of hydrogen is required to unite with one gram of chlorine?

H+ClHCI.

12. What volume is occupied by 78 grams of gaseous hydrogen chloride (HCl)?

13. 500 grams of potassium chlorate are heated, how much potassium chloride is left?

14. 490 grams of potassium chlorate are heated, what volume of oxygen is evolved?

15. What volume of oxygen at 17° C. is evolved on heating 245 grams of potassium chlorate ?

16. What volume of oxygen and mass of potassium perchlorate is formed on gently heating 245-2 grams of potassium chlorate ?

17.

How many litres of chlorine at 13° C. and 720 m.m. are required to produce 3810 grams of bleaching powder?

Cl2+ CaH2O2 = H2O + CaOCI ̧.

2 2

2

18. How many kilograms of pyrolusite, containing 80 per cent. of manganese dioxide, are required to decompose 400 kilograms of hydrogen chloride, containing of its mass of real acid?

MnO,+4HCl = 2H2O + MnCl, + Cl..

2

19. 100 grams of sodium chloride are heated with hydrogen sulphate, what volume of hydrogen chloride at 39° C. is evolved?

2NaCl + H2SO1 = Na2SO + 2HC1.

20. Find the percentage composition of bleaching powder if its formula be (a) CaO,Cl,, (B) CaOCl,, (7) Ca2H2OCI

21. The density of chlorine trioxide is found to be 39.7, and that of the tetroxide 33-8; what might these numbers be expected to be?

22. How much potassium chlorate is required to make 36.48 litres of oxygen at 15° C. and 750 m.m.?

KCIO1 = KCl + 30.

23. Find the mass of one litre of chloroform (CHCl) vapour measured at 200° C.

24. Find the mass of 1.6 litres of carbonyl chloride (COCI,) measured at 26° C. and 730 m.m.

25. What volume of chlorine at 12° C. and 750 m.m. can be obtained from 1170 grams of salt?

2NaCl + MnO, + 2H2SO1 = 2H2O + Na2SO + MnSO ̧ + Cl ̧.

2