Question

Calculate the formula mass of sodium carbonate (Na2CO3.10H20).

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Answer

Formula mass of sodium carbonate

= (2 x atomic mass of Na) + (1 x atomic mass of C) + (3 x atomic mass of O) + 10 [(2 x atomic mass of H) + (1 x atomic mass of O)]

= 2 x 23 + 1 x 12 + 3 x 16 + 10 [(2 x 1) + (1 x 16)]

= 46 + 12 + 48 + 180

= 286 u

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