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  4. Which symbol replaces the unit of atomic mass, amu?

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Q. Which symbol replaces the unit of atomic mass, amu?

MHT CETMHT CET 2018Some Basic Concepts of Chemistry

Solution:

Presently the new symbol used is 'u' (known as unified mass) in place of amu. It is defined as mass exactly equal to $1 / 12$ th the mass of one $C -12$ atom.