1 CHAPTER XV. SULPHUR. S = 32. 1. FIND the percentage composition of (a) galena (PbS), (B) zinc blende (ZnS). 2. Find the formulæ of substances containing (a) copper 34.5 per cent., iron 30.5 per cent., and sulphur 35 per cent., (B) calcium 29.4 per cent., sulphur 23.6 per cent., and oxygen 47 per cent. 3. What volume is occupied by 1000 kilograms of (a) common sulphur (▲ 2·05), and (B) plastic sulphur (▲ 1·957)? 4. 8 grams of sulphur are burnt in air, what volume of sulphur dioxide is formed? .5. 20 grams of sulphur are burnt in oxygen, what volume of sulphur dioxide is formed? S+O2 = SO, 6. 9.6 grams of sulphur are heated in hydrogen, what volume of hydrogen sulphide is formed? S+ H2 = H2S. 7. What volume is occupied by 19.2 grams of sulphur dioxide (SO,)? 8. How much sulphur must be burnt to make 10 litres of sulphur dioxide? S+0,= SO,. 9. What mass of hydrogen sulphate (A 1·84) will a tank 1 by 2 by 3 metres hold? 10. 102-4 grams of sulphur will form how much hydrogen sulphate? S+ 30+ H2O = H2SO. 11. Find the percentage composition of hydrogen (a) sulphite (H,SO), and (ß) sulphate (H2SO). 12. A tank of hydrogen sulphate (▲ 1·84) is 10 feet long and 5 feet wide and deep. How many tonnes of acid will it hold? 13. 16 litres of hydrogen diffuse through an apparatus in 100 minutes, how much sulphur dioxide (SO,) will diffuse under the same conditions? 14. What volume of sulphur dioxide at 20° C. and 740 m.m. can be obtained by the action of 20 grams of hydrogen sulphate upon copper? Cu + 2H2SO = CuSO, + 2H ̧O + SO2. 4 15. 50 c.c. of sulphur (A 2) are burnt, what volume of sulphur dioxide at 14o C. and 780 m.m. is formed? 16. How much sulphur is there in a litre of sulphur dioxide (SO) measured at 39o C. and 720 m.m. ? 17. The density of the vapour of hydrogen sulphate referred to air is 1.697. What is its apparent molecular weight? 18. How much copper must be dissolved in hydrogen sulphate to furnish 10 litres of sulphur dioxide at 13o C.? Cu + 2H,SO = CuSO, + 2H2O+ SO.. 19. How much copper and hydrogen sulphate are required to make 1000 grams of sulphur dioxide? Cu + 2H2SO1 = CuSO ̧ + 2H2O + SO2. 20. 10 c.c. of sulphur (A 2) are burnt, what volume of sulphur dioxide at 30° C. is formed? 21. How much copper must be dissolved in hydrogen sulphate to make 10 litres of sulphur dioxide at 18° C. ? Cu + 2H,SO = CuSO, + 2H2O+SO,. 22. What volume is occupied by 100 grams of sulphurvapour (S) at 400° C.? 23. 50 kilograms of alcohol are mixed with 50 kilograms of carbon disulphide and burnt. From how large a room could the oxygen (20 per cent. by volume available) be removed? 2 24. 10 c.c. of carbon disulphide CS, (A 1.27) are heated, what does the gas measure at 350° C. and 600 m.m.? 25. By heating 10000 grains of silver in sulphur-vapour Dumas obtained 11481-5 grains of silver sulphide. Find the atomic weight of sulphur. Ag2+S = Ag2S. 26. A litre of sulphur dioxide is found to weigh 2.8672 grams, what is its molecular weight? 27. A body contains hydrogen 1.12 per cent., sulphur 35.9 per cent., and oxygen 62.98 mula and name. per cent. Find its for 28. What volume is occupied by 225 grams of hydrogen sulphide (HS) at 273° C. ? 29. How much hydrogen sulphate can be made from a ton of iron pyrites? 2FeS2+ 4H2O + 150 = Fe̟ ̧ ̧ + 4H2SO. 2 2 3 30. Find the mass in grams of a cubic inch of hydrogen sulphate (A 1.84). 31. How many tons of pyrites containing 42 per cent. of sulphur are required to make 100 tons of oil of vitriol containing 70 per cent of real acid? S+30 + H2O= H2SO. 32. 100 grams of lead form 146.45 grams of lead sulphate, find the molecular weight of hydrogen sulphate. Pb+ H2SO1 = H ̧ + PьSО ̧. 4 2 33. How much oil of vitriol containing 70 per cent. of real acid can be made from 250 kilos. of pyrites containing 42 per cent. of sulphur? S+30 + H ̧0 = H2SO̟. 2 34. What volume of hydrogen sulphate (A 1.84) can be obtained from 1000 kilos. of iron pyrites? 2FeS ̧ + 4H ̧O + 150 = Fe̟ ̧О ̧ + 4H,SO. 3 35. How much sulphur is there in a litre of hydrogen sulphate (H2SO ▲ 1·84)? 36. 10 grams of hydrogen sulphate are heated with phosphorus pentachloride, what volume will the sulphuryl dichloride formed occupy at 350° C ? H2SO + 2PC1 ̧ = 2POCI ̧ + 2HCl + SOCI ̧. 4 37. 5 c.c. of dilute hydrogen sulphate are naturalized by 18.8 c.c. of a solution of sodium carbonate, containing 106 grams of the salt per litre. How many grams of hydrogen sulphate are there in a litre of the dilute acid? Na ̧CO2+ H2SO -- CO2+ H2O + Na,SO. 3 4 2 2 38. 4 litres of sulphur dioxide at 13o C. are mixed with oxygen and passed over a heated mixture of cupric and chromic oxides, how much sulphur trioxide is formed? 39. Find the percentage composition of (a) potassium sulphate (K,SO), and (B) sodium sulphate (Na,SO1). 40. Find the percentage composition of crystallized ferrous sulphate (FeSO, 7H,O), and common alum (KA1,4SO. 24H ̧0). 41. To make 100 litres of hydrogen sulphide, how much ferrous sulphide must be dissolved in acid? 42. What volume of hydrogen sulphide will diffuse under the same circumstances as 10 litres of oxygen? 43. Two litres of hydrogen sulphide and one litre of sulphur dioxide both at 0° C. are passed through a red-hot tube, what volumes of sulphur and steam at 1000° C. are formed? 2H,S+SO2 = 3S+ 2H ̧O. 44. 20 grams of sulphur are heated in hydrogen, what volume of hydrogen sulphide at 300° C. is formed? 45. What volume of air is required to burn one litre of hydrogen sulphide? H2S +30= H2O+SO ̧· 46. 10 grams of ferrous sulphide are dissolved in acid, what volume of hydrogen sulphide is evolved? FeS + H2SO, FeSO, + H2S. |