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(a) Define 'formula unit' of an ionic ...

(a) Define 'formula unit' of an ionic compound. What is the formula unit of (i) sodium chloride, and (ii) magnesium chloride ?
(b) Calculate the formula masses of the following compounds :
(i) Calcium chloride , (ii) Sodium carbonate
(Given : Atomic masses : `Ca = 40 u , Cl = 35.5 u , Na = 23 u , C = 12 u , O = 16 u`)

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