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Question

What is meant by formula mass? Explain it elaborately.


Solution

The formula mass of a molecule (also known as formula weight) is the sum of the atomic weights of the atoms in the empirical formula of the compound. Formula weight is given in atomic mass units (amu).

Example and Calculation

The molecular formula  for glucose is C6H12O6, so the empirical formula is CH2O.

The formula mass of glucose is (12)+2(1)+16 = 30 amu.

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