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What Is Meant By Molecular Mass? How To Calculate The Molar Mass Of Water?

Referencing Styles : Harvard | Pages : 1

In chemistry, there are various types of mass and the terms of called the weight rather than the mass that is used interchangeably. A strong example is the molecular mass or the molecular weight.  The molecular mass is a particular number that is equal to the atomic mass sum in a specific molecule. It is relative to the C 12 atom that is taken to have a mass of 12.  The molecular mass is a dimensionless quantity and it is given Dalton unit or the atomic mass unit to indicate the mass. It is relative to 1/12 th mass in a single atom of carbon -12.  The molecular mass is better known as molecular weight.  It is because the mass is relative in the carbon-12 and more correct to the value.  The molecular mass can be calculated by taking each of the elements of atomic mass.  The number of each element is together added.  Taken for example, in order to find the molecular mass of methane, the first step is to look up at the atomic mass in carbon C and hydrogen H. It will be done using a periodic table.  The atomic mass of carbon is 12.011 and the atomic mass of hydrogen is 1.00794. This is because the lack of subscript following the C will have carbon as present in methane. This is because there is no subscript 4 that follows H along with the atoms of hydrogen that are compound. Hence, after adding up the atomic masses;

The methane molecular mass= 12.011+ (1.00794)(4)

 The atomic mass of methane = 16.043

 The problems that calculated the molecular mass for the small molecules is problematic for the polymers and the macromolecules. This is because the proteins and the polymers have experimental methods which may be utilized for obtaining an average mass of molecule.  The techniques are properly used for the purpose of including static light scattering, crystallography and the viscosity measurements. The atomic mass of a particular atom is heavier than an atom of carbon which is taken as 12. One of the atomic mass unit is equivalent to one-twelfth of the mass of atom of carbon isotope.  The atomic mass of a specific element is in an average relative mass of the atoms as compared to the carbon atom 12.

 The fractional abundance of the isotope is the fraction in the total number of atoms which is comprised of the particular isotope. The atomic mass of a unique element = (Fractional abundance of isotope 1x mass of the isotope 1) + ( Fractional abundance of isotope 2x mass of the isotope 2).  The molecular mass of a particular substance is the number of times when the molecule is heavier than one-twelfth of an atom bomb’s mass in an atom of carbon- 12.  It is also equal to the sum of its atomic masses in all the atoms which are present in one such molecule of a substance. Taken for example: Water (H2O)

 The Atomic mass of H= 1 unit

 The Atomic mass of O= 16 units

  Hence, the molecular mass of water = 2 x atomic mass of H+1 X atomic mass of O.

= 2X1+16X1

= 18 units

 

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