Molecular weight represents the molecular weight which it is also possible to call value of mass of a molecule. Molecular weight in atomic units of mass is expressed. If to sort value of molecular weight in parts, then it will turn out that the sum of mass of all atoms which are a part of a molecule and represents its molecular weight. If to speak about weight units of measure, then mainly all measurements are performed in grams.
Instruction
1. The concept of molecular weight is connected with a concept of a molecule. But it is impossible to tell that this condition can be applied only to such substances where the molecule, for example, of hydrogen, is separately. For cases when molecules are not separately from the others, and in close interrelation, all above-mentioned conditions and definitions are also valid.
2. For a start, to determine the mass of hydrogen, you will need any substance which part hydrogen is and from which it can be allocated simply. It can be any spirit solution or other mix which part of components under certain conditions changes the state and easily exempts solution from the presence. Find solution from which it is possible and to couple necessary or unnecessary substances by means of heating. It is the easiest way. Now be defined, you will evaporate substance which is not necessary for you or it will be hydrogen which molecular mass you also plan to measure. If unnecessary substance - nothing terrible, the main thing that it was not toxic evaporates. in case of evaporation of required substance, you need to prepare the equipment that all evaporations remained in a flask.
3. After you separated all unnecessary from structure, start measurements. For this purpose you will suit Avogadro's number. With its help you will be able to calculate the relative atomic and molecular mass of hydrogen. Find all necessary parameters of hydrogen which are present at any table, determine density of the received gas as it is useful for one of formulas. Then substitute all received results and if it is necessary, change unit of measure for grams what it was already told above about.
4. The concept of molecular weight is most relevant for cases, when it comes to polymers. For them it is more important to enter a concept of average molecular weight, in view of heterogeneity of the molecules which are their part. Also in the average size of molecular weight it is possible to judge that, extent of polymerization of any given substance is how high.