How is relative atomic and molecular mass calculated?
Stephenexhibit
14 Dec, 2018
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The relative molecular mass/relative formula mass is defined as the sum of all the individual atomic masses of ALL the atoms in the formula (Mr). e.g. for ionic compounds e.g. NaCl = 23 + 35.5 58.5)
Relative molecular mass = the sum of all the atomic masses for ALL the atoms in a given formula.Whereas relative atomic mass only applies to a single atom.
Example
The diatomic molecules of the elements hydrogen H 2 and chlorine Cl 2
relative atomic masses, Ar : H = 1, Cl = 35.5
Formula masses, RMM or M r
relative molecular mass for hydrogen H 2 = 2 x 1 = 2
relative molecular mass for chlorine Cl 2 = 2 x 35.5 = 71 respectively.
it's the movement of molecules in a particular direction in the relative mass of acceleration due to gravity
