Answers

2016-01-26T13:06:08+05:30
Sodium Carbonate - Na₂CO₃ - (23)2+(12)+(16)3 = 46+12+48 = 106 .
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2016-01-26T13:09:07+05:30
Mass of Na = 23u
mass of C=12u 
mass of O = 16u
therefore,
Na₂CO₃ = 23*2+12*1+16*3 = 46+12+48=106 u ..
 i hope it helps....
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