Chemical Calculations

Chemical Calculations

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 edition. Excerpt: ...It required 105.6 seconds for a certain volume of air to effuse and 39.3 seconds for the same quantity of helium, (a) What is the density of helium to air? (6) Its molecular weight? Ans. (a) 0.1385. (6) 4.009. 227. It required 87.2 seconds for a certain volume of oxygen to pass through a minute orifice and 127.1 seconds for the same volume of boron fluoride. What is the molecular weight of the boron fluoride? Ans. 67.98. 228. How many grams of sulphuric acid must act on a metal to produce 1200 cc. of hydrogen at 0 C. and 760 mm., all of the hydrogen of the acid being liberated? Ans. 5.256 g. 229. If 15 g. of iron react with sulphuric acid thus: Fe + H2S04 = FeS04 + H2, how many liters of hydrogen are liberated at standard? Ans. 6.017 L. 230. In the reaction: CaC03 + 2 HCl = CaCl2 + CO2 + H20. (a) How many grams of calcium carbonate are required to produce 1700 cc. of carbon dioxide at 780 mm. and 17 C? (6) If 860 cc. of carbon dioxide were liberated at 754 mm. and 20 C, how many grams of calcium carbonate were acted upon? Ans. (a) 7.3376 g. (b) 3.5515 g. 231. Lackawanna coal corresponds to the composition: Per cent Volatile combustible matter 5.00 Carbon 84.00 Ash 11.00 Considering the volatile combustible matter to be methane, what volume of air at standard, J of which is oxygen, is necessary to burn completely a kilogram? Ans. 8538.7 L. 232. Consider the coal of problem just preceding. If the heat of combustion of methane burned to carbon dioxide and water is 13,344 Calories and of carbon burned to carbon dioxide is 8080 Calories, what is the heat of combustion of this coal? Ans. 7454.4 CaJ. 233. From the equations: NaCl + H2SO4 = NaHSO4 + HC1 4 HCl + Mn02 = MnCl2 + 2 H20 + Cl2. (a) What volume of chlorine measured under standard more

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  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236546997
  • 9781236546999