1] a) Calculate the formula unit mass of Na2CO3 [Atomic mass of Na = 23 u C=12 u 0 = 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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unit mass=2×23+12+3×16
=46+12+48
= 106u
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