Question

Calculate the formula unit mass of Na2O.

Na = 23 u, O = 16 u​

Answer 1

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Formula unit mass of Na₂O

= 2(At. mass of Na) + (At. mass of O)

= 2(23) + 16 ──{ given that, Na = 23 u &

O = 16 u

= 46 + 16

= 62 u

∴ Formula unit mass of Na₂O = 62 u

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Answer 2

Given atomic mass :-

• Na = 23 u
• O = 16 u

= 2× atomic mass of Na + Atomic mass of O

= (2×23)+16 = 62u

Formula of unit mass is the sum of the atomic masses of all atoms present in that compound.

information

There are different type of formula in which atomic masses are added like molecular mass and formula of unit mass but formula mass differs in ionic compound because formula unit is only applicable for ionic compound