How much is16 grams of baking powder?

Pure baking soda is actually sodium bicarbonate, or sodium hydrogen carbonate. It has chemical formula NaHCO3.Formula mass of NaHCO3 = 23.0 + 1.0 + 12.0 + 3(16.0) = 84.0

So, amount of NaHCO3 = 16/84.0 = 0.190mol

In each formula unit of NaHCO3 there are three oxygen atoms.

Number of moles of O = 3 x 0.190 = 0.571mol

There are 0.571 moles of O atoms in 16g NaHCO3.

The Avogadro's number is 6.02 x 10^23

Therefore, number of oxygen atoms = 0.571 x 6.02 x 10^23 = 3.44 x 10^23