Chapter : 3. Atoms & Molecules
Gram atomic mass
Gram atomic mass
Gram atomic mass of an element is defined as that much quantity of the element whose mass expressed in grams is numerically equal to its atomic mass. To find gram atomic mass we keep the numerical value the some as the atomic mass, but simply change the units from u to g. for example, atomic mass of aluminium is 27 u. Its gram atomic mass is 27 g.
Gram atomic mass of Isotopes :
M1 & M2 are relative masses of isotopes and X1 & X2 are relative % content
Example. Chlorine contains two types of atoms having relative masses 35 and 37 and their relative abundance is 3 : 1. In such cases the atomic mass of the element is the average of relative masses of different isotopes of the element.
Atomic mass of chlorine =
Atoms usually exist in two ways.
(i) Molecules (ii) Ions
Gram atomic mass of an element is defined as that much quantity of the element whose mass expressed in grams is numerically equal to its atomic mass. To find gram atomic mass we keep the numerical value the some as the atomic mass, but simply change the units from u to g. for example, atomic mass of aluminium is 27 u. Its gram atomic mass is 27 g.
Gram atomic mass of Isotopes :
M1 & M2 are relative masses of isotopes and X1 & X2 are relative % content
Example. Chlorine contains two types of atoms having relative masses 35 and 37 and their relative abundance is 3 : 1. In such cases the atomic mass of the element is the average of relative masses of different isotopes of the element.
Atomic mass of chlorine =
Atoms usually exist in two ways.
(i) Molecules (ii) Ions
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