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30. (a) Define 'formula unit' of an ionic compound. What is the formula unit of () sodium chloride, and(i) magnesium chloride?(b) Calculate the formula masses of the following compounds :(i) Calcium chloride (i) Sodium carbonate(Given : Atomic masses : Ca = 40 u ; Cl-35.5 u ; Na23 u ; C = 12 u; O = 16 u)

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