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117. B. (a) NaHCO3
= 11+1+6+(8×3)
= 42
(b) Na2 CO3
= (11×2)+6+(8×3)
=52
= 11+1+6+(8×3)
= 42
(b) Na2 CO3
= (11×2)+6+(8×3)
=52
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