By Guy de Maupassant
Адаптированное издание для чтения из серии effortless Readers - Facile à lire, уровень C (словарный запас 1800 слов). Постраничный глоссарий, вопросы на понимание. Данный материал станет хорошим дополнением к основной учебной программе и поможет развить у студентов многогранное понимание языка.
Table des Matieres:
• Le bonheur
• Un lâche
• l. a. confession
• Le petit
• l. a. main
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Extra resources for Contes du jour et de la nuit
1 atm, we may assume that D (@P)P-4 — (@P)p*=p at all temperatures from 0 to 400 C. Heat of Formation and Free Energy of Monomeric Gaseous Formaldehyde. Within the limits of experimental error, the most accurate value for the heat of formation of monomeric gaseous formaldehyde determinable from existent data is 28 kcal per mol at 18°C. 5 kcal as based on the beta-graphite standard. T. 7 kcal at 18°C (corrected to the newer Rossini standards mentioned above) which serves as an independent check on the von Wartenberg value.
This solution probably contains methanoi-formaldehyde addition products analogous to the hydration products in aqueous solutions. These may be envisaged as hemi-acetals having the structural formulas: CH 3 OCH 2 OH, CH 3 OCH 2 OCH 2 OH 3 CH 3 OCH 2 OCH 2 OCH 2 OH, etc. 8 kcal per mol. It will be noted from these data that approximately the same quantity •of heat is liberated when formaldehyde is dissolved either in alcohols or in water. The heat of polymerization for formaldehyde, although somewhat lower than the 15 kcal value originally reported by Delepine6, is also of the same order of magnitude.
The state of equilibrium is determined by the temperature and formaldehyde content of the solution. High temperatures and low formaldehyde concentrations favor the monohydrate; low temperatures and high concentrations favor the polymeric hydrates. Polymers having a degree of polymerization greater than the trimeric hydrate, rIO(CH20)3H, are probably only partially •soluble at room temperature and precipitate from solution when formed to any considerable extent. Methylene Glycol As previously indicated, formaldehyde monohydrate has the chemical structure of methylene glycol, CH a (0H) 2?