- 期刊
基礎化學實驗的改進與評估（II）
Improvement and Evaluation of Experiments in Introductory Chemistry Laboratory Courses (II) Determination of Molecular Weight by Dumas Method
摘要
都默士法（Dumas method）求分子量的實驗步驟中，將錐形瓶體積加大，可得較佳之結果。但是對揮發性高，分子量低的化合物，結果誤差甚大，經由蒸氣壓之修正即達誤差要求範圍內。本文將討論實驗之改進和誤差產生之來源且修正之，並以數據來證實。
關鍵字
無資料並列摘要
In the experiment of molecular weight determination by Dumas method, the experimental results can be improved by using a larger Erlenmeyer flask so that the weight of condensed liquid can have three significant figures. Except for CCI_4 and CHCI_3, the weight of the replaced air must be corrected in order to have acceptable molecular weight.