Question

what is formula unit mass?How is it calculated? write the formula unit mass of Na2S2O3

Answer 1

The formula unit mass of a substance is the sum of the atomic masses of all atoms in aformula unit of a compound. The term 'formula unit' is used for those substances which are made up of ions.

First you calculate the number of moles by dividing the mass of the sample by the molar mass of the compound. You then calculate the number of formula units by multiplying by Avogadro's number

Answer 2

Answer:

Formula unit mass is the sum of the atomic masses of all atoms present in a formula unit of a compound. It is calculated by adding the atomic masses of all the atoms present in one formula unit. Formula unit mass of

(NH4)2so4 = 14x2 + 4x2 + 32 + 16x4 = 132 u.