6.NaHCO3 is the active ingredient in baking soda. How many grams of oxygen are in 0.52 g of NaHCO3?
(A) 0.099 g
(B) 0.019 g
(C) 6.19× 103 g
(D) 0.30 g

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統計： A(0), B(0), C(0), D(3), E(0) #3328480