NaHCO₃ Is the Active Ingredient in Baking Soda

NaHCO₃ is the active ingredient in baking soda. How many grams of oxygen are in 0.31 g of NaHCO₃?

A) 0.0037 g
B) 0.18 g
C) 0.011 g
D) 0.059 g
E) 0.9 g