Class 9 Chemistry Atoms and Molecules Formula unit mass

Formula unit mass

Formula unit mass of a substance is the sum of the atomic masses of all the atoms present in the formula of a respective compound.


Let us calculate the formula unit mass of NaCl. we will find it out by following process

  • We know atomic mass of Na is 23 and that of Cl is 35.5
  • Formula unit mass of NaCl is 1 X 23 + 1 X 35.5 = 58.5 u

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