وزن مولکولی
وزن مولکولی (Molecular Mass) مجموع وزن های اتمی همه اتم های موجود در فرمول آن ماده است. به عنوان مثال وزن مولکول آب (H2O) برابر است با :
وزن مولکولی آب = وزن اتم اکسیژن+ (وزن اتم هیدروژن)×2
18=16+(1)×2
منابع و پیوندها
گردآوری شده توسط دپارتمان پژوهشی شرکت پاکمن
چارلز مورتیمر ، شیمی عمومی ، جلد اول ، مرکز نشر دانشگاهی ، 1381.
برداشت از مطالب سایت با ذکر منبع بلامانع است
وزن مولکولی از دید wikipedia.org
The SI unit is kg. However, more commonly the atomic mass unit (symbol u or Da) is used.Molecular mass is sometimes called molecular weight. However, this is incorrect because mass and weight are different (see Mass versus weight). Another possible source of confusion is that some older textbooks use the term "molecular weight" to mean the molar mass. This terminology is not used in modern literature. The molar mass of a substance is the mass of 1 mol (the SI unit for the basis SI quantity amount of substance, having the symbol n) of the substance. This has a numerical value which is the average molecular mass of the molecules in the substance multiplied by Avogadro's constant approximately 6.022×1023. The most common units of molar mass are g/mol because in those units the numerical value equals the average molecular mass in units of u...more
وزن مولکولی از دید lenntech.com
This online calculator you can use for computing the average molecular weight (MW) of molecules by entering the chemical formulas (for example C3H4OH(COOH)3 ). Or you can choose by one of the next two option-lists, which contains a series of common organic compounds (including their chemical formula) and all the elements. The molecular mass calculator will recognize the entered formula's, which are included in the list of organic compounds. The calculator handles at most two different bracket levels. Make sure you enter the molecule of crystallization at last...more
وزن مولکولی از دید users.rcn.com
The weight of a molecule is the sum of the weights of the atoms of which it is made. The unit of weight is the dalton, one-twelfth the weight of an atom of 12C. Thus the molecular weight (MW) of water is 18 daltons. (We shall ignore the tiny error introduced by the presence of traces of other isotopes - 17O, 18O, and 2H among the predominant 1H and 16O atoms.) For an example, let us assume that you want to study the response of honeybees to solutions of various kinds of sugars. One way to do this would be to make up several different solutions and see which one the bees prefer to harvest. You might offer the bees the choice between, say, a 35% solution of sucrose (common table sugar) and a 35% solution of glucose (a natural component of honey). This would involve, in each case, dissolving 350 parts by weight (e.g., grams) of sugar in 650 parts (g) of water, thus producing 1000 g of each solution. But there is a problem with this approach. The willingness of the honeybee to respond to the presence of sugar dissolved in water is dependent on the number of sugar molecules in a given volume of the solution...more
