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 + x 16]
= 46 + 12 + 48 +180
= 286 u
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