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Calculate the formula unit mass of Na2CO3. [Atomic mass of Na = 23 u, C = 12 u, O = 16 u]

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The formula unit mass of a substance is the sum of the atomic masses of all the atoms in the formula unit of an ionic compound. 

Therefore, formula unit mass of Na2CO3 

= 2Na + 1C + 3O = (2 × 23) + (1 × 12) +( 3 × 16) = 46 + 12 + 48 = 106 u.

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