Question

differentiate between molecular mass and formula mass which of the following have molecular formula H2O,NaCl,KI,H2SO4

Answer 1

molecular mass--

the sum of atomic masses of all the atoms present in one molecular substance, is it's molecular mass. for example mass if water (H2O) is 18 amu.

formula mass ----

it is the sum of atomic masses of all the atoms present in one formula unit of an ionic substance. for example, formula mass of sodium chloride (NaCl) is 58.5 amu.

* H2O and H2SO4 are molecular formulas.

* nacl and Kl are formula units.

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