(8) Define: (1) a.m.u. (2) mole (3) mass number | web4study

(8) Define: (1) a.m.u. (2) mole (3) mass number



(i) a.m.u. (Atomic Mass Unit)

It is a unit of mass used for atoms and molecules, equal to 1/12 of the mass of an atom of Carbon -12. It is equal to 1.66033 x 10-21 kg.

(ii) Mole:

The molecular mass, or atomic mass or formula mass of a substance expressed in grams is called Mole.

(iii) Mass Number: (A)

The total sum of protons and neutrons in the nucleus of an atom is called Mass Number and denoted by ‘A’.

 


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